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Subject: [spring] Updating the SPRING WG Charter
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Hi SPRING,

After the discussions on the list and in London relating to the charter,
Bruno and I have been working to propose a new charter for the WG with
Martin, and the other routing ADs. The text for this suggested charter is
below. We would like to solicit WG feedback on the charter text prior to
Martin taking to the IESG. We'd like to try and get the charter agreed
prior to IETF 102 in Montr=C3=A9al.

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home
of
Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serves
as
a forum to discuss SPRING networks operations, define new applications, and
specify extensions of Segment Routing technologies.

The SPRING WG defines procedures that allow a node to steer a packet
through an
SR Policy instantiated as an ordered list of instructions called segments
and
without the need for per-path state information to be held at transit nodes=
.
Full explicit control (through loose or strict path specification) can be
achieved in a network comprising only SPRING nodes, however SPRING nodes
must
inter-operate through loose routing in existing networks and may find it
advantageous to use loose routing for other network applications.

The scope of the SPRING WG work includes both single Autonomous System (AS)
and
multi-AS environments. Segment Routing operates within a trusted domain; as
described in the architecture, a node imposing a segment list is assumed to
be
allowed to do so. Nonetheless, the SPRING WG must strive to identify and
address security considerations brought up by the technologies it defines.
The
technologies SPRING WG defines may be applicable to both centralised and
distributed path computation.

SPRING WG should avoid modification to existing data planes that would make
them incompatible with existing deployments. Where possible, existing
control
and management plane protocols must be used within existing architectures t=
o
implement the SPRING function. Any modification of - or extension to -
existing
architectures, data planes, or control or management plane protocols should
be
carried out in the WGs responsible for the architecture, data plane, or
control
or management plane protocol being modified and in coordination with the
SPRING
WG, but may be done in SPRING WG after agreement with all the relevant WG
chairs and responsible Area Directors.


The SPRING WG will manage its specific work items by milestones agreed with
the
responsible Area Director.

The work-items of the SPRING WG include functional specifications for:

o Segment Routing policies and the associated steering and traffic
engineering
  mechanisms.

o Source-routed stateless service chaining using SR-MPLS and SRv6
dataplanes.

o SRv6 network programming for the underlay networks and overlay services,
and
  including data plane behavior and functions associated with SIDs

o Operation, Administration and Management (OAM), and traffic accounting in
  networks with SR-MPLS and SRv6 data planes in the case where SR introduce=
s
  specificities compared to MPLS or IPv6 technologies.

o Performance Management (PM) and monitoring in networks with SR-MPLS and
SRv6
  data planes in the case where SR introduces specificities compared to
MPLS or
  IPv6 technologies.

o The inter-working between SRv6 and SR-MPLS.

o Using SR as the mechanism to identify sets of resources in networks with
  SR-MPLS and SRv6 dataplanes.

Any of the above may require architectural extensions.

The work-items of SPRING WG also include:

o Specification of management models (YANG) for Segment Routing
applications,
  services and networks with SR-MPLS and SRv6 dataplanes.

The SPRING WG will coordinate and collaborate with other WGs as needed.
Specific
expected interactions include (but may not be limited to):

* mpls on the MPLS dataplane and OAM extensions,
* 6man on the IPv6 dataplane for SR and associated OAM extensions
* lsr on OSPF and IS-IS extensions to flood SPRING-related information
        * idr for BGP extensions
* bess for VPN control plane
* pce on extensions to communicate with an external entity to compute and
program SPRING paths
* teas on generic traffic engineering architecture

Please comment on the contents of the charter text on the list.

Thanks,
Bruno & Rob

--000000000000aa0562056d96c02a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi SPRING,<div><br></div><div>After the discussions on the=
 list and in London relating to the charter, Bruno and I have been working =
to propose a new charter for the WG with Martin, and the other routing ADs.=
 The text for this suggested charter is below. We would like to solicit WG =
feedback on the charter text prior to Martin taking to the IESG. We&#39;d l=
ike to try and get the charter agreed prior to IETF 102 in Montr=C3=A9al.</=
div><div><br></div><div><div><font face=3D"monospace">The Source Packet Rou=
ting in NetworkinG (SPRING) Working Group is the home of</font></div><div><=
font face=3D"monospace">Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 =
(SRv6). SPRING WG serves as</font></div><div><font face=3D"monospace">a for=
um to discuss SPRING networks operations, define new applications, and</fon=
t></div><div><font face=3D"monospace">specify extensions of Segment Routing=
 technologies.</font></div><div><font face=3D"monospace"><br></font></div><=
div><font face=3D"monospace">The SPRING WG defines procedures that allow a =
node to steer a packet through an</font></div><div><font face=3D"monospace"=
>SR Policy instantiated as an ordered list of instructions called segments =
and</font></div><div><font face=3D"monospace">without the need for per-path=
 state information to be held at transit nodes.</font></div><div><font face=
=3D"monospace">Full explicit control (through loose or strict path specific=
ation) can be</font></div><div><font face=3D"monospace">achieved in a netwo=
rk comprising only SPRING nodes, however SPRING nodes must</font></div><div=
><font face=3D"monospace">inter-operate through loose routing in existing n=
etworks and may find it</font></div><div><font face=3D"monospace">advantage=
ous to use loose routing for other network applications.</font></div><div><=
font face=3D"monospace"><br></font></div><div><font face=3D"monospace">The =
scope of the SPRING WG work includes both single Autonomous System (AS) and=
</font></div><div><font face=3D"monospace">multi-AS environments. Segment R=
outing operates within a trusted domain; as</font></div><div><font face=3D"=
monospace">described in the architecture, a node imposing a segment list is=
 assumed to be</font></div><div><font face=3D"monospace">allowed to do so. =
Nonetheless, the SPRING WG must strive to identify and</font></div><div><fo=
nt face=3D"monospace">address security considerations brought up by the tec=
hnologies it defines.=C2=A0 The</font></div><div><font face=3D"monospace">t=
echnologies SPRING WG defines may be applicable to both centralised and</fo=
nt></div><div><font face=3D"monospace">distributed path computation.</font>=
</div><div><font face=3D"monospace"><br></font></div><div><font face=3D"mon=
ospace">SPRING WG should avoid modification to existing data planes that wo=
uld make</font></div><div><font face=3D"monospace">them incompatible with e=
xisting deployments. Where possible, existing control</font></div><div><fon=
t face=3D"monospace">and management plane protocols must be used within exi=
sting architectures to</font></div><div><font face=3D"monospace">implement =
the SPRING function. Any modification of - or extension to - existing</font=
></div><div><font face=3D"monospace">architectures, data planes, or control=
 or management plane protocols should be</font></div><div><font face=3D"mon=
ospace">carried out in the WGs responsible for the architecture, data plane=
, or control</font></div><div><font face=3D"monospace">or management plane =
protocol being modified and in coordination with the SPRING</font></div><di=
v><font face=3D"monospace">WG, but may be done in SPRING WG after agreement=
 with all the relevant WG</font></div><div><font face=3D"monospace">chairs =
and responsible Area Directors.</font></div><div><font face=3D"monospace"><=
br></font></div><div><font face=3D"monospace"><br></font></div><div><font f=
ace=3D"monospace">The SPRING WG will manage its specific work items by mile=
stones agreed with the</font></div><div><font face=3D"monospace">responsibl=
e Area Director.</font></div><div><font face=3D"monospace"><br></font></div=
><div><font face=3D"monospace">The work-items of the SPRING WG include func=
tional specifications for:</font></div><div><font face=3D"monospace"><br></=
font></div><div><font face=3D"monospace">o Segment Routing policies and the=
 associated steering and traffic engineering</font></div><div><font face=3D=
"monospace">=C2=A0 mechanisms.</font></div><div><font face=3D"monospace"><b=
r></font></div><div><font face=3D"monospace">o Source-routed stateless serv=
ice chaining using SR-MPLS and SRv6 dataplanes.</font></div><div><font face=
=3D"monospace"><br></font></div><div><font face=3D"monospace">o SRv6 networ=
k programming for the underlay networks and overlay services, and</font></d=
iv><div><font face=3D"monospace">=C2=A0 including data plane behavior and f=
unctions associated with SIDs</font></div><div><font face=3D"monospace"><br=
></font></div><div><font face=3D"monospace">o Operation, Administration and=
 Management (OAM), and traffic accounting in</font></div><div><font face=3D=
"monospace">=C2=A0 networks with SR-MPLS and SRv6 data planes in the case w=
here SR introduces</font></div><div><font face=3D"monospace">=C2=A0 specifi=
cities compared to MPLS or IPv6 technologies.</font></div><div><font face=
=3D"monospace"><br></font></div><div><font face=3D"monospace">o Performance=
 Management (PM) and monitoring in networks with SR-MPLS and SRv6</font></d=
iv><div><font face=3D"monospace">=C2=A0 data planes in the case where SR in=
troduces specificities compared to MPLS or</font></div><div><font face=3D"m=
onospace">=C2=A0 IPv6 technologies.</font></div><div><font face=3D"monospac=
e"><br></font></div><div><font face=3D"monospace">o The inter-working betwe=
en SRv6 and SR-MPLS.</font></div><div><font face=3D"monospace"><br></font><=
/div><div><font face=3D"monospace">o Using SR as the mechanism to identify =
sets of resources in networks with</font></div><div><font face=3D"monospace=
">=C2=A0 SR-MPLS and SRv6 dataplanes.</font></div><div><font face=3D"monosp=
ace"><br></font></div><div><font face=3D"monospace">Any of the above may re=
quire architectural extensions.</font></div><div><font face=3D"monospace"><=
br></font></div><div><font face=3D"monospace">The work-items of SPRING WG a=
lso include:</font></div><div><font face=3D"monospace"><br></font></div><di=
v><font face=3D"monospace">o Specification of management models (YANG) for =
Segment Routing applications,</font></div><div><font face=3D"monospace">=C2=
=A0 services and networks with SR-MPLS and SRv6 dataplanes.</font></div><di=
v><font face=3D"monospace"><br></font></div><div><font face=3D"monospace">T=
he SPRING WG will coordinate and collaborate with other WGs as needed. Spec=
ific</font></div><div><font face=3D"monospace">expected interactions includ=
e (but may not be limited to):</font></div><div><font face=3D"monospace"><b=
r></font></div><div><font face=3D"monospace"><span style=3D"white-space:pre=
">	</span>* mpls on the MPLS dataplane and OAM extensions,</font></div><div=
><font face=3D"monospace"><span style=3D"white-space:pre">	</span>* 6man on=
 the IPv6 dataplane for SR and associated OAM extensions</font></div><div><=
font face=3D"monospace"><span style=3D"white-space:pre">	</span>* lsr on OS=
PF and IS-IS extensions to flood SPRING-related information</font></div><di=
v><font face=3D"monospace">=C2=A0 =C2=A0 =C2=A0 =C2=A0 * idr for BGP extens=
ions</font></div><div><font face=3D"monospace"><span style=3D"white-space:p=
re">	</span>* bess for VPN control plane</font></div><div><font face=3D"mon=
ospace"><span style=3D"white-space:pre">	</span>* pce on extensions to comm=
unicate with an external entity to compute and program SPRING paths</font><=
/div><div><font face=3D"monospace"><span style=3D"white-space:pre">	</span>=
* teas on generic traffic engineering architecture</font></div></div><div><=
br></div><div><div>Please comment on the contents of the charter text on th=
e list.</div><div><br></div><div>Thanks,</div><div>Bruno &amp; Rob</div></d=
iv></div>

--000000000000aa0562056d96c02a--


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Date: Fri, 01 Jun 2018 09:43:52 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
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Thread-Topic: [spring] Updating the SPRING WG Charter
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Hi Rob,

=20

Looks good, few additions, please see inline=20

=20

Cheers,

Jeff

From: spring <spring-bounces@ietf.org> on behalf of Rob Shakir <robjs=3D40goo=
gle.com@dmarc.ietf.org>
Date: Friday, June 1, 2018 at 09:05
To: SPRING WG List <spring@ietf.org>
Subject: [spring] Updating the SPRING WG Charter

=20

Hi SPRING,

=20

After the discussions on the list and in London relating to the charter, Br=
uno and I have been working to propose a new charter for the WG with Martin,=
 and the other routing ADs. The text for this suggested charter is below. We=
 would like to solicit WG feedback on the charter text prior to Martin takin=
g to the IESG. We'd like to try and get the charter agreed prior to IETF 102=
 in Montr=C3=A9al.

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of

Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6).

[jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D

SPRING WG serves as

a forum to discuss SPRING networks operations, define new applications, and

specify extensions of Segment Routing technologies.

=20

The SPRING WG defines procedures that allow a node to steer a packet throug=
h an

SR Policy instantiated as an ordered list of instructions called segments a=
nd

without the need for per-path state information to be held at transit nodes=
.

Full explicit control (through loose or strict path specification) can be

achieved in a network comprising only SPRING nodes, however SPRING nodes mu=
st

inter-operate through loose routing in existing networks and may find it

advantageous to use loose routing for other network applications.

=20

The scope of the SPRING WG work includes both single Autonomous System (AS)=
 and

multi-AS environments. Segment Routing operates within a trusted domain; as

described in the architecture, a node imposing a segment list is assumed to=
 be

allowed to do so. Nonetheless, the SPRING WG must strive to identify and

address security considerations brought up by the technologies it defines. =
 The

technologies SPRING WG defines may be applicable to both centralised and

distributed path computation.

=20

SPRING WG should avoid modification to existing data planes that would make

them incompatible with existing deployments. Where possible, existing contr=
ol

and management plane protocols must be used within existing architectures t=
o

implement the SPRING function. Any modification of - or extension to - exis=
ting

architectures, data planes, or control or management plane protocols should=
 be

carried out in the WGs responsible for the architecture, data plane, or con=
trol

or management plane protocol being modified and in coordination with the SP=
RING

WG, but may be done in SPRING WG after agreement with all the relevant WG

chairs and responsible Area Directors.

=20

=20

The SPRING WG will manage its specific work items by milestones agreed with=
 the

responsible Area Director.

=20

The work-items of the SPRING WG include functional specifications for:

=20

o Segment Routing policies and the associated steering and traffic engineer=
ing

  mechanisms.

=20

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplane=
s.

=20

o SRv6 network programming for the underlay networks and overlay services, =
and

  including data plane behavior and functions associated with SIDs

=20

o Operation, Administration and Management (OAM), and traffic accounting in

  networks with SR-MPLS and SRv6 data planes in the case where SR introduce=
s

  specificities compared to MPLS or IPv6 technologies.

=20

o Performance Management (PM) and monitoring in networks with SR-MPLS and S=
Rv6

  data planes in the case where SR introduces specificities compared to MPL=
S or

  IPv6 technologies.

=20

o The inter-working between SRv6 and SR-MPLS.

=20

o Using SR

[jeff] SR conveyed metadata perhaps? Think of BSID x-connect into another l=
ayer

 as the mechanism to identify sets of resources in networks with

  SR-MPLS and SRv6 dataplanes.

=20

Any of the above may require architectural extensions.

=20

The work-items of SPRING WG also include:

=20

o Specification of management models (YANG) for Segment Routing application=
s,

  services and networks with SR-MPLS and SRv6 dataplanes.

=20

The SPRING WG will coordinate and collaborate with other WGs as needed. Spe=
cific

expected interactions include (but may not be limited to):

=20

=C2=A0=C2=A0=C2=A0=C2=A0 * mpls on the MPLS dataplane and OAM extensions,

=C2=A0=C2=A0=C2=A0=C2=A0 * 6man on the IPv6 dataplane for SR and associated OAM extensions

=C2=A0=C2=A0=C2=A0=C2=A0 * lsr on OSPF and IS-IS extensions to flood SPRING-related informa=
tion

[jeff] in RIFT we plan to support SR as well

        * idr for BGP extensions

=C2=A0=C2=A0=C2=A0=C2=A0 * bess for VPN control plane

=C2=A0=C2=A0=C2=A0=C2=A0 * pce on extensions to communicate with an external entity to comp=
ute and program SPRING paths

=C2=A0=C2=A0=C2=A0=C2=A0 * teas on generic traffic engineering architecture

[jeff] rtgwg for fast convergence related topics

=20

Please comment on the contents of the charter text on the list.

=20

Thanks,

Bruno & Rob

_______________________________________________ spring mailing list spring@=
ietf.org https://www.ietf.org/mailman/listinfo/spring=20


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--></style></head><body lang=3DEN-US link=3D"#0563C1" vlink=3D"#954F72"><div clas=
s=3DWordSection1><p class=3DMsoNormal>Hi Rob,<o:p></o:p></p><p class=3DMsoNormal><=
o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Looks good, few additions, please see=
 inline <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=
=3DMsoNormal><span style=3D'color:black'>Cheers,<o:p></o:p></span></p></div><p c=
lass=3DMsoNormal><span style=3D'color:black'>Jeff</span><o:p></o:p></p><div styl=
e=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p =
class=3DMsoNormal><b><span style=3D'font-size:12.0pt;color:black'>From: </span><=
/b><span style=3D'font-size:12.0pt;color:black'>spring &lt;spring-bounces@ietf=
.org&gt; on behalf of Rob Shakir &lt;robjs=3D40google.com@dmarc.ietf.org&gt;<b=
r><b>Date: </b>Friday, June 1, 2018 at 09:05<br><b>To: </b>SPRING WG List &l=
t;spring@ietf.org&gt;<br><b>Subject: </b>[spring] Updating the SPRING WG Cha=
rter<o:p></o:p></span></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p=
></div><div><p class=3DMsoNormal><a name=3D"_MailOriginalBody">Hi SPRING,<o:p></=
o:p></a></p><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalB=
ody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'=
mso-bookmark:_MailOriginalBody'>After the discussions on the list and in Lon=
don relating to the charter, Bruno and I have been working to propose a new =
charter for the WG with Martin, and the other routing ADs. The text for this=
 suggested charter is below. We would like to solicit WG feedback on the cha=
rter text prior to Martin taking to the IESG. We'd like to try and get the c=
harter agreed prior to IETF 102 in Montr=C3=A9al.<o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp=
;</o:p></span></p></div><div><div><p class=3DMsoNormal><span style=3D'mso-bookma=
rk:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>The Source Pac=
ket Routing in NetworkinG (SPRING) Working Group is the home of</span></span=
><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span sty=
le=3D'font-family:"Courier New"'>Segment Routing (SR) using MPLS (SR-MPLS) and=
 IPv6 (SRv6).<o:p></o:p></span></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'>[jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D<o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>SPRING WG serves as</span></span><span =
style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fon=
t-family:"Courier New"'>a forum to discuss SPRING networks operations, defin=
e new applications, and</span></span><span style=3D'mso-bookmark:_MailOriginal=
Body'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>specify e=
xtensions of Segment Routing technologies.</span></span><span style=3D'mso-boo=
kmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>The SPRING WG defines procedures that a=
llow a node to steer a packet through an</span></span><span style=3D'mso-bookm=
ark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courie=
r New"'>SR Policy instantiated as an ordered list of instructions called seg=
ments and</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-family:"Courier New"'>without the need for pe=
r-path state information to be held at transit nodes.</span></span><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p clas=
s=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-f=
amily:"Courier New"'>Full explicit control (through loose or strict path spe=
cification) can be</span></span><span style=3D'mso-bookmark:_MailOriginalBody'=
><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookma=
rk:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>achieved in a =
network comprising only SPRING nodes, however SPRING nodes must</span></span=
><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span sty=
le=3D'font-family:"Courier New"'>inter-operate through loose routing in existi=
ng networks and may find it</span></span><span style=3D'mso-bookmark:_MailOrig=
inalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'm=
so-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>advan=
tageous to use loose routing for other network applications.</span></span><s=
pan style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;<=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-family:"Courier New"'>The scope of the SPRI=
NG WG work includes both single Autonomous System (AS) and</span></span><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p=
 class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'f=
ont-family:"Courier New"'>multi-AS environments. Segment Routing operates wi=
thin a trusted domain; as</span></span><span style=3D'mso-bookmark:_MailOrigin=
alBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>describ=
ed in the architecture, a node imposing a segment list is assumed to be</spa=
n></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p>=
</div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-family:"Courier New"'>allowed to do so. Nonetheless, the SP=
RING WG must strive to identify and</span></span><span style=3D'mso-bookmark:_=
MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New=
"'>address security considerations brought up by the technologies it defines=
.&nbsp; The</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-family:"Courier New"'>technologies SPRING W=
G defines may be applicable to both centralised and</span></span><span style=
=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fam=
ily:"Courier New"'>distributed path computation.</span></span><span style=3D'm=
so-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span>=
</p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBod=
y'><span style=3D'font-family:"Courier New"'>SPRING WG should avoid modificati=
on to existing data planes that would make</span></span><span style=3D'mso-boo=
kmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Cour=
ier New"'>them incompatible with existing deployments. Where possible, exist=
ing control</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-family:"Courier New"'>and management plane =
protocols must be used within existing architectures to</span></span><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font=
-family:"Courier New"'>implement the SPRING function. Any modification of - =
or extension to - existing</span></span><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>archit=
ectures, data planes, or control or management plane protocols should be</sp=
an></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p=
></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=
<span style=3D'font-family:"Courier New"'>carried out in the WGs responsible f=
or the architecture, data plane, or control</span></span><span style=3D'mso-bo=
okmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNorma=
l><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Cou=
rier New"'>or management plane protocol being modified and in coordination w=
ith the SPRING</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:=
p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_=
MailOriginalBody'><span style=3D'font-family:"Courier New"'>WG, but may be don=
e in SPRING WG after agreement with all the relevant WG</span></span><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font=
-family:"Courier New"'>chairs and responsible Area Directors.</span></span><=
span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;=
</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><s=
pan style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier=
 New"'>The SPRING WG will manage its specific work items by milestones agree=
d with the</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></=
o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mail=
OriginalBody'><span style=3D'font-family:"Courier New"'>responsible Area Direc=
tor.</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></=
span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigin=
alBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span styl=
e=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>T=
he work-items of the SPRING WG include functional specifications for:</span>=
</span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:=
p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-book=
mark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>o Segment Ro=
uting policies and the associated steering and traffic engineering</span></s=
pan><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span =
style=3D'font-family:"Courier New"'>&nbsp; mechanisms.</span></span><span styl=
e=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></s=
pan></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-family:"Courier New"'>o Source-routed stateless ser=
vice chaining using SR-MPLS and SRv6 dataplanes.</span></span><span style=3D'm=
so-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span>=
</p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBod=
y'><span style=3D'font-family:"Courier New"'>o SRv6 network programming for th=
e underlay networks and overlay services, and</span></span><span style=3D'mso-=
bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"C=
ourier New"'>&nbsp; including data plane behavior and functions associated w=
ith SIDs</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:=
p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOr=
iginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New=
"'>o Operation, Administration and Management (OAM), and traffic accounting =
in</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'><span style=3D'font-family:"Courier New"'>&nbsp; networks with SR-MPLS a=
nd SRv6 data planes in the case where SR introduces</span></span><span style=
=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fam=
ily:"Courier New"'>&nbsp; specificities compared to MPLS or IPv6 technologie=
s.</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>o P=
erformance Management (PM) and monitoring in networks with SR-MPLS and SRv6<=
/span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span>=
</p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBod=
y'><span style=3D'font-family:"Courier New"'>&nbsp; data planes in the case wh=
ere SR introduces specificities compared to MPLS or</span></span><span style=
=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fam=
ily:"Courier New"'>&nbsp; IPv6 technologies.</span></span><span style=3D'mso-b=
ookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNorm=
al><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p>=
</div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-family:"Courier New"'>o The inter-working between SRv6 and =
SR-MPLS.</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:=
p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOr=
iginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New=
"'>o Using SR<o:p></o:p></span></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'>[jeff] SR conveyed metadata perhaps? Think of =
BSID x-connect into another layer<o:p></o:p></span></p><p class=3DMsoNormal><s=
pan style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier=
 New"'> as the mechanism to identify sets of resources in networks with</spa=
n></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p>=
</div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-family:"Courier New"'>&nbsp; SR-MPLS and SRv6 dataplanes.</=
span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>Any of =
the above may require architectural extensions.</span></span><span style=3D'ms=
o-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoN=
ormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span><=
/p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><span style=3D'font-family:"Courier New"'>The work-items of SPRING WG also i=
nclude:</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"=
'>o Specification of management models (YANG) for Segment Routing applicatio=
ns,</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></s=
pan></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-family:"Courier New"'>&nbsp; services and networks =
with SR-MPLS and SRv6 dataplanes.</span></span><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D=
'font-family:"Courier New"'>The SPRING WG will coordinate and collaborate wi=
th other WGs as needed. Specific</span></span><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>=
expected interactions include (but may not be limited to):</span></span><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></div><div><p=
 class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-family:"Courier New"'>=C2=A0=C2=A0=C2=A0=C2=A0 * mpls on the =
MPLS dataplane and OAM extensions,</span></span><span style=3D'mso-bookmark:_M=
ailOriginalBody'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"=
'>=C2=A0=C2=A0=C2=A0=C2=A0 * 6man on the IPv6 dataplane for SR and associated OAM extensions=
</span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span=
></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBo=
dy'><span style=3D'font-family:"Courier New"'>=C2=A0=C2=A0=C2=A0=C2=A0 * lsr on OSPF and IS-IS=
 extensions to flood SPRING-related information<o:p></o:p></span></span></p>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>[jeff] in RI=
FT we plan to support SR as well<o:p></o:p></span></p></div><div><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-famil=
y:"Courier New"'>&nbsp; &nbsp; &nbsp; &nbsp; * idr for BGP extensions</span>=
</span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>=C2=A0=C2=A0=C2=A0=C2=A0 * bess for VPN control plane</=
span></span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><span style=3D'font-family:"Courier New"'>=C2=A0=C2=A0=C2=A0=C2=A0 * pce on extensions to co=
mmunicate with an external entity to compute and program SPRING paths</span>=
</span><span style=3D'mso-bookmark:_MailOriginalBody'><o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>=C2=A0=C2=A0=C2=A0=C2=A0 * teas on generic traffic engi=
neering architecture<o:p></o:p></span></span></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'>[jeff] rtgwg for fast convergence relat=
ed topics<o:p></o:p></span></p></div></div><div><p class=3DMsoNormal><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div><=
div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Please c=
omment on the contents of the charter text on the list.<o:p></o:p></span></p=
></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=
<o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'>Thanks,<o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Bruno &amp; Rob<o:p><=
/o:p></span></p></div></div></div><p class=3DMsoNormal><span style=3D'mso-bookma=
rk:_MailOriginalBody'>_______________________________________________ spring=
 mailing list spring@ietf.org https://www.ietf.org/mailman/listinfo/spring <=
/span><o:p></o:p></p></div></body></html>

--B_3610691033_338907689--



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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/aMNiGgCc2SPiutrqghpjWaFl-cE>
Subject: [spring] draft-allan-pim-sr-mpls-multicast-framework-00
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Hi

A new draft has been posted to PIM. This is a revision of an older draft: d=
raft-allan-spring-mpls-mcast.

The draft describes an approach to SR-MPLS multicast using the native MPLS =
dataplane.

Comments and questions are very welcome
Dave & co-authors

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<p class=3D"MsoNormal">Hi<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A new draft has been posted to PIM. This is a revisi=
on of an older draft: draft-allan-spring-mpls-mcast.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft describes an approach to SR-MPLS multicast=
 using the native MPLS dataplane.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Comments and questions are very welcome<o:p></o:p></=
p>
<p class=3D"MsoNormal">Dave &amp; co-authors<o:p></o:p></p>
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From: James N Guichard <james.n.guichard@huawei.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
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From nobody Sat Jun  2 01:21:21 2018
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To: "Zafar Ali (zali)" <zali@cisco.com>, Huzhibo <huzhibo@huawei.com>, "draft-ali-spring-srv6-oam@ietf.org" <draft-ali-spring-srv6-oam@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Cc: Lizhenbin <lizhenbin@huawei.com>, Yangang <yangang@huawei.com>
References: <06CF729DA0D6854E8C1E5121AC3330DF9E0B4ECF@NKGEML515-MBS.china.huawei.com> <8d679c41-106b-c735-34af-e717de9f0d33@pi.nu> <582182D2-46A9-4671-AB99-FBDF15DA595F@cisco.com>
From: Loa Andersson <loa@pi.nu>
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Date: Sat, 2 Jun 2018 10:21:13 +0200
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Subject: Re: [spring] About draft-ali-spring-srv6-oam-00
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Zafar,

My concern is that any load balancing tool might hash on the field where
you have the O-bit, if it does OAM traffic and normal payload traffic
will take different paths through the network.

How do you guarantee  this this will not happen?

/Loa

On 2018-05-29 19:11, Zafar Ali (zali) wrote:
> Hi Loa,
> 
> Thanks for your question.
> 
> O-bit "move" from SRH draft to this SRv6 OAM draft is part of a comment 
> received an agreement made during the LC of the SRH draft. Please review 
> the mail chain 
> https://www.ietf.org/mail-archive/web/ipv6/current/msg30131.html. There 
> was never a suggestion or agreement to "remove" O-bit or SRH.Flags field.
> 
> Load balancing and ECMP in an SRv6 network are explained in 
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-13#section-4.4. 
> An implementation is expected to use the minimum of (source, dest) 
> address and flow label in the outer IPv6 header to compute the hash. 
> RFC6437 describes the use of flow labels to compute a hash for IPv6 
> packets.
> 
> Thanks
> 
> Regards â€¦ Zafar
> 
> *From: *Loa Andersson <loa@pi.nu>
> *Date: *Tuesday, May 29, 2018 at 9:48 AM
> *To: *Huzhibo <huzhibo@huawei.com>, "Zafar Ali (zali)" <zali@cisco.com>, 
> "draft-ali-spring-srv6-oam@ietf.org" 
> <draft-ali-spring-srv6-oam@ietf.org>, "spring@ietf.org" <spring@ietf.org>
> *Cc: *Lizhenbin <lizhenbin@huawei.com>, Yangang <yangang@huawei.com>
> *Subject: *Re: [spring] About draft-ali-spring-srv6-oam-00
> 
> Folks,
> 
> I thought we had an agreement to remove the O-bit. As ZhiBo Hu points
> 
> out other drafts drops it.
> 
> The obvious reason to not use an O-bit is that if it ever is part of
> 
> what an multipath functions hash on it will csue OAM traffic and
> 
> "normal" traffic to use different paths. This defeats the idea with
> 
> OAM traffic.
> 
> /Loa
> 
> On 2018-05-16 06:56, Huzhibo wrote:
> 
>     Hi,
> 
>     draft-ali-spring-srv6-oam-00 says The OAM packets are identified by
> 
>     setting the O-bit in SRHï¼ŒBut I Notice the latest
> 
>     I-D.6man-segment-routing-headerhas removed O-bit in the SRH extension
> 
>     header. I want to confirm that draft-ali-spring-srv6-oam-00 will also
> 
>     remove o-bit or keep the o-bit in the later version?
> 
>     Ths
> 
>     ZhiBo Hu
> 
>     _______________________________________________
> 
>     spring mailing list
> 
>     spring@ietf.org<mailto:spring@ietf.org>
> 
>     https://www.ietf.org/mailman/listinfo/spring
> 
> -- 
> 
> Loa AnderssonÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â email: loa@pi.nu<mailto:loa@pi.nu>
> 
> Senior MPLS Expert
> 
> Bronze Dragon ConsultingÂ Â Â Â Â Â Â Â Â Â Â Â  phone: +46 739 81 21 64
> 
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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Hi Loa,

Is there any known implementations you can show here which builds its IPv6
load balancing hash bases on the *variable length* IPv6 extension headers
content ? Or is your concern simply a speculation ? :)

As Zafar already indicated bunch of IETF work went into proposing to use
flow label which is part of base IPv6 header (fixed 40 bytes) - to name a
few RFC6437, RFC6438, RFC6294 etc ... for that very purpose.

So at min if someone indeed wants to expose himself and construct a hash
based on the variable length fields a knob should be provided to allow to
configure such network element to skip extension headers.

Regards,
Robert.


On Sat, Jun 2, 2018 at 10:21 AM, Loa Andersson <loa@pi.nu> wrote:

> Zafar,
>
> My concern is that any load balancing tool might hash on the field where
> you have the O-bit, if it does OAM traffic and normal payload traffic
> will take different paths through the network.
>
> How do you guarantee  this this will not happen?
>
> /Loa
>
> On 2018-05-29 19:11, Zafar Ali (zali) wrote:
>
>> Hi Loa,
>>
>> Thanks for your question.
>>
>> O-bit "move" from SRH draft to this SRv6 OAM draft is part of a comment
>> received an agreement made during the LC of the SRH draft. Please review
>> the mail chain https://www.ietf.org/mail-arch
>> ive/web/ipv6/current/msg30131.html. There was never a suggestion or
>> agreement to "remove" O-bit or SRH.Flags field.
>>
>> Load balancing and ECMP in an SRv6 network are explained in
>> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-
>> header-13#section-4.4. An implementation is expected to use the minimum
>> of (source, dest) address and flow label in the outer IPv6 header to
>> compute the hash. RFC6437 describes the use of flow labels to compute a
>> hash for IPv6 packets.
>>
>> Thanks
>>
>> Regards =E2=80=A6 Zafar
>>
>> *From: *Loa Andersson <loa@pi.nu>
>> *Date: *Tuesday, May 29, 2018 at 9:48 AM
>> *To: *Huzhibo <huzhibo@huawei.com>, "Zafar Ali (zali)" <zali@cisco.com>,
>> "draft-ali-spring-srv6-oam@ietf.org" <draft-ali-spring-srv6-oam@ietf.org=
>,
>> "spring@ietf.org" <spring@ietf.org>
>> *Cc: *Lizhenbin <lizhenbin@huawei.com>, Yangang <yangang@huawei.com>
>> *Subject: *Re: [spring] About draft-ali-spring-srv6-oam-00
>>
>> Folks,
>>
>> I thought we had an agreement to remove the O-bit. As ZhiBo Hu points
>>
>> out other drafts drops it.
>>
>> The obvious reason to not use an O-bit is that if it ever is part of
>>
>> what an multipath functions hash on it will csue OAM traffic and
>>
>> "normal" traffic to use different paths. This defeats the idea with
>>
>> OAM traffic.
>>
>> /Loa
>>
>> On 2018-05-16 06:56, Huzhibo wrote:
>>
>>     Hi,
>>
>>     draft-ali-spring-srv6-oam-00 says The OAM packets are identified by
>>
>>     setting the O-bit in SRH=EF=BC=8CBut I Notice the latest
>>
>>     I-D.6man-segment-routing-headerhas removed O-bit in the SRH extensio=
n
>>
>>     header. I want to confirm that draft-ali-spring-srv6-oam-00 will als=
o
>>
>>     remove o-bit or keep the o-bit in the later version?
>>
>>     Ths
>>
>>     ZhiBo Hu
>>
>>     _______________________________________________
>>
>>     spring mailing list
>>
>>     spring@ietf.org<mailto:spring@ietf.org>
>>
>>     https://www.ietf.org/mailman/listinfo/spring
>>
>> --
>>
>> Loa Andersson                        email: loa@pi.nu<mailto:loa@pi.nu>
>>
>> Senior MPLS Expert
>>
>> Bronze Dragon Consulting             phone: +46 739 81 21 64
>>
>>
>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
>>
>>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

--00000000000091e8ea056da533e1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Loa,</div><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small">Is there any known implementations you can show here =
which builds its IPv6 load balancing hash bases on the <b>variable length</=
b> IPv6 extension headers content ? Or is your concern simply a speculation=
 ? :)</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetic=
a,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">As Zafar alread=
y indicated bunch of IETF work went into proposing to use flow label which =
is part of base IPv6 header (fixed 40 bytes) - to name a few RFC6437, RFC64=
38, RFC6294 etc ... for that very purpose.</div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small">So at min if someone indeed wants to expose himself an=
d construct a hash based on the variable length fields a knob should be pro=
vided to allow to configure such network element to skip extension headers.=
</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:small">Regards,<br>Robert.</=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">=C2=A0</div></div><div class=3D"gmail_extra"><br><di=
v class=3D"gmail_quote">On Sat, Jun 2, 2018 at 10:21 AM, Loa Andersson <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu<=
/a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Zafar,<br>
<br>
My concern is that any load balancing tool might hash on the field where<br=
>
you have the O-bit, if it does OAM traffic and normal payload traffic<br>
will take different paths through the network.<br>
<br>
How do you guarantee=C2=A0 this this will not happen?<br>
<br>
/Loa<span class=3D""><br>
<br>
On 2018-05-29 19:11, Zafar Ali (zali) wrote:<br>
</span><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"><span class=3D"">
Hi Loa,<br>
<br>
Thanks for your question.<br>
<br>
O-bit &quot;move&quot; from SRH draft to this SRv6 OAM draft is part of a c=
omment received an agreement made during the LC of the SRH draft. Please re=
view the mail chain <a href=3D"https://www.ietf.org/mail-archive/web/ipv6/c=
urrent/msg30131.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf=
.org/mail-arch<wbr>ive/web/ipv6/current/msg30131.<wbr>html</a>. There was n=
ever a suggestion or agreement to &quot;remove&quot; O-bit or SRH.Flags fie=
ld.<br>
<br>
Load balancing and ECMP in an SRv6 network are explained in <a href=3D"http=
s://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-13#section-4=
.4" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/dr<wbr=
>aft-ietf-6man-segment-routing-<wbr>header-13#section-4.4</a>. An implement=
ation is expected to use the minimum of (source, dest) address and flow lab=
el in the outer IPv6 header to compute the hash. RFC6437 describes the use =
of flow labels to compute a hash for IPv6 packets.<br>
<br>
Thanks<br>
<br>
Regards =E2=80=A6 Zafar<br>
<br></span>
*From: *Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">lo=
a@pi.nu</a>&gt;<br>
*Date: *Tuesday, May 29, 2018 at 9:48 AM<br>
*To: *Huzhibo &lt;<a href=3D"mailto:huzhibo@huawei.com" target=3D"_blank">h=
uzhibo@huawei.com</a>&gt;, &quot;Zafar Ali (zali)&quot; &lt;<a href=3D"mail=
to:zali@cisco.com" target=3D"_blank">zali@cisco.com</a>&gt;, &quot;<a href=
=3D"mailto:draft-ali-spring-srv6-oam@ietf.org" target=3D"_blank">draft-ali-=
spring-srv6-oam@iet<wbr>f.org</a>&quot; &lt;<a href=3D"mailto:draft-ali-spr=
ing-srv6-oam@ietf.org" target=3D"_blank">draft-ali-spring-srv6-oam@iet<wbr>=
f.org</a>&gt;, &quot;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">s=
pring@ietf.org</a>&quot; &lt;<a href=3D"mailto:spring@ietf.org" target=3D"_=
blank">spring@ietf.org</a>&gt;<br>
*Cc: *Lizhenbin &lt;<a href=3D"mailto:lizhenbin@huawei.com" target=3D"_blan=
k">lizhenbin@huawei.com</a>&gt;, Yangang &lt;<a href=3D"mailto:yangang@huaw=
ei.com" target=3D"_blank">yangang@huawei.com</a>&gt;<br>
*Subject: *Re: [spring] About draft-ali-spring-srv6-oam-00<span class=3D"">=
<br>
<br>
Folks,<br>
<br>
I thought we had an agreement to remove the O-bit. As ZhiBo Hu points<br>
<br>
out other drafts drops it.<br>
<br>
The obvious reason to not use an O-bit is that if it ever is part of<br>
<br>
what an multipath functions hash on it will csue OAM traffic and<br>
<br>
&quot;normal&quot; traffic to use different paths. This defeats the idea wi=
th<br>
<br>
OAM traffic.<br>
<br>
/Loa<br>
<br>
On 2018-05-16 06:56, Huzhibo wrote:<br>
<br>
=C2=A0 =C2=A0 Hi,<br>
<br>
=C2=A0 =C2=A0 draft-ali-spring-srv6-oam-00 says The OAM packets are identif=
ied by<br>
<br>
=C2=A0 =C2=A0 setting the O-bit in SRH=EF=BC=8CBut I Notice the latest<br>
<br>
=C2=A0 =C2=A0 I-D.6man-segment-routing-heade<wbr>rhas removed O-bit in the =
SRH extension<br>
<br>
=C2=A0 =C2=A0 header. I want to confirm that draft-ali-spring-srv6-oam-00 w=
ill also<br>
<br>
=C2=A0 =C2=A0 remove o-bit or keep the o-bit in the later version?<br>
<br>
=C2=A0 =C2=A0 Ths<br>
<br>
=C2=A0 =C2=A0 ZhiBo Hu<br>
<br>
=C2=A0 =C2=A0 ______________________________<wbr>_________________<br>
<br>
=C2=A0 =C2=A0 spring mailing list<br>
<br></span>
=C2=A0 =C2=A0 <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@i=
etf.org</a>&lt;mailto:<a href=3D"mailto:spring@ietf.org" target=3D"_blank">=
spring@<wbr>ietf.org</a>&gt;<br>
<br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=
=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinf=
o/spring</a><span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
-- <br>
<br>
Loa Andersson=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<wbr>=C2=
=A0=C2=A0=C2=A0email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi=
.nu</a>&lt;mailto:<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu<=
/a>&gt;</font></span><span class=3D""><br>
<br>
Senior MPLS Expert<br>
<br>
Bronze Dragon Consulting=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 phone: +46 739 81 21 64<br>
<br>
<br>
<br>
______________________________<wbr>_________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/spring</a><br=
>
<br>
</span></blockquote><span class=3D"im HOEnZb">
<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br></span><div class=3D"HOEnZb"><div class=3D"h5">
______________________________<wbr>_________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/spring</a><br=
>
</div></div></blockquote></div><br></div>

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Robert Raszuk <robert@raszuk.net>, Loa Andersson <loa@pi.nu>
CC: "spring@ietf.org" <spring@ietf.org>, "draft-ali-spring-srv6-oam@ietf.org" <draft-ali-spring-srv6-oam@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [spring] About draft-ali-spring-srv6-oam-00
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From: Rob Shakir <robjs@google.com>
Date: Sun, 3 Jun 2018 14:32:13 -0700
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To: Linda Dunbar <linda.dunbar@huawei.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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Hi Linda,

On Fri, Jun 1, 2018 at 12:35 PM Linda Dunbar <linda.dunbar@huawei.com>
wrote:

>
>
> The Source Packet Routing in NetworkinG (SPRING) Working Group is the hom=
e
> of
>
> Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6).
>
> [jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D
>
> SPRING WG serves as
>
> a forum to discuss SPRING networks operations, define new applications, a=
nd
>
> specify extensions of Segment Routing technologies.
>
> [Linda] Does the =E2=80=9Cnew applications=E2=80=9D in the sentence above=
 refer to the
> =E2=80=9CUse cases=E2=80=9D for SPRING?
>
> Is the =E2=80=9CExtensions=E2=80=9D being discussed in SPRING also includ=
e the
> =E2=80=9Cextensions=E2=80=9D to other protocols?
>

robjs> The aim here is to define that SPRING is where we discuss new things
that are done with SR. I don't think we want to constrain things to say
that only use-case work is done in SPRING (actually, we've had little
success with a number of the use case documents). The extensions referred
to are extensions to SR technologies. Per the later wording in the charter,
the intention here is to clarify that functional specifications for those
extensions can be done in SPRING, but the actual extension work is owned by
the WG that owns that technology.

robjs> You can imagine the SR-TE policy work breaks down this way: we
discuss the "application" which is steering traffic onto sets of SR paths,
and define a functional specification document for how that works. If that
is realised in BGP (as it is being today), IDR owns the protocol
specification, if it's in PCEP, then it's done in that WG.


>  *snip*
>
o Source-routed stateless service chaining using SR-MPLS and SRv6
> dataplanes.
>
>
>
> [Linda] o Source-routed stateless SD-WAN paths traversing through SR
> domain (i.e. SR as part of SD-WAN=E2=80=99s underlay network)
>

robjs> Our focus here is to provide a constrained set of areas where there
is a need for work within SPRING. The discussions that we had in the
working group in London were focused around capturing the set of
technologies that have strong support and folks to work on. If we have new
proposals around this work, then we can always consider working on them if
they need extensions to the SR architecture. At the moment, the preference
is to keep this list constrained such that we can focus the working group.


>  *snip*
>
>
>
> o The inter-working between SRv6 and SR-MPLS.
>
>
>
> [Linda] o The inter-working between SR and legacy networks (which is far
> more likely than SRv6 & SR-MPLS interworking)
>

robjs> The LDP interop draft is something that is going to the IESG at the
moment. There is existing work in TEAS (in WGLC) that covers co-existence
of RSVP-TE and SR. Are there specific areas that we have gaps? The reason
that we call out SRv6/SR-MPLS interop is that there has been some
discussion of this, and we have not got an answer for this yet.

Thanks for the comments.

Kind regards,
r.

>

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<div dir=3D"ltr">Hi Linda,<div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr">On Fri, Jun 1, 2018 at 12:35 PM Linda Dunbar &lt;<a href=3D"mailto:lind=
a.dunbar@huawei.com" target=3D"_blank">linda.dunbar@huawei.com</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_7239376321292688603m_8993393139636520670WordSection1">
<p class=3D"MsoNormal">=C2=A0<br></p></div></div><div lang=3D"EN-US" link=
=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_7239376321292688603m_8993393=
139636520670WordSection1"><div><p class=3D"MsoNormal"><u></u></p>
</div>
</div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div cla=
ss=3D"m_7239376321292688603m_8993393139636520670WordSection1"><div><div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6).<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal">[jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D<=
u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
SPRING WG serves as</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
a forum to discuss SPRING networks operations, define new applications, and=
</span><u></u><u></u></p>
</div>
</div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F=
72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSection1"><=
div><div><div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
specify extensions of Segment Routing technologies.<u></u><u></u></span></p=
>
</div></div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D=
"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSecti=
on1"><div><div><div><p class=3D"MsoNormal"><span style=3D"color:#1f497d">[L=
inda] Does the =E2=80=9Cnew applications=E2=80=9D in the sentence above ref=
er to the =E2=80=9CUse cases=E2=80=9D for SPRING? =C2=A0<u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Is the =E2=80=9CExtens=
ions=E2=80=9D being discussed in SPRING also include the =E2=80=9Cextension=
s=E2=80=9D to other protocols? =C2=A0</span></p></div></div></div></div></d=
iv></blockquote><div><br></div><div>robjs&gt; The aim here is to define tha=
t SPRING is where we discuss new things that are done with SR. I don&#39;t =
think we want to constrain things to say that only use-case work is done in=
 SPRING (actually, we&#39;ve had little success with a number of the use ca=
se documents). The extensions referred to are extensions to SR technologies=
. Per the later wording in the charter, the intention here is to clarify th=
at functional specifications for those extensions can be done in SPRING, bu=
t the actual extension work is owned by the WG that owns that technology.</=
div><div><br></div><div>robjs&gt; You can imagine the SR-TE policy work bre=
aks down this way: we discuss the &quot;application&quot; which is steering=
 traffic onto sets of SR paths, and define a functional specification docum=
ent for how that works. If that is realised in BGP (as it is being today), =
IDR owns the protocol specification, if it&#39;s in PCEP, then it&#39;s don=
e in that WG.=C2=A0</div><div>=C2=A0</div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_723937=
6321292688603m_8993393139636520670WordSection1"><div><div><div><p class=3D"=
MsoNormal"><span style=3D"color:#1f497d"><u></u><u></u></span></p>
</div></div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D=
"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSecti=
on1">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0*snip*</p></div></div></div></blockquot=
e><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"#0563C1" vlink=
=3D"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSe=
ction1"><div><div><div><p class=3D"MsoNormal"><span style=3D"font-family:&q=
uot;Courier New&quot;">o Source-routed stateless service chaining using SR-=
MPLS and SRv6 dataplanes.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
</div></div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D=
"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSecti=
on1"><div><div><div><p class=3D"MsoNormal"><span style=3D"color:#1f497d">[L=
inda] o Source-routed stateless SD-WAN paths traversing through SR domain (=
i.e. SR as part of SD-WAN=E2=80=99s underlay network)</span></p></div></div=
></div></div></div></blockquote><div><br></div><div>robjs&gt; Our focus her=
e is to provide a constrained set of areas where there is a need for work w=
ithin SPRING. The discussions that we had in the working group in London we=
re focused around capturing the set of technologies that have strong suppor=
t and folks to work on. If we have new proposals around this work, then we =
can always consider working on them if they need extensions to the SR archi=
tecture. At the moment, the preference is to keep this list constrained suc=
h that we can focus the working group.=C2=A0</div><div>=C2=A0</div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex"><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F7=
2"><div class=3D"m_7239376321292688603m_8993393139636520670WordSection1"><d=
iv><div><div><p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u><u=
></u></span></p>
</div></div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D=
"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSecti=
on1">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0*snip*</p></div><div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div cla=
ss=3D"m_7239376321292688603m_8993393139636520670WordSection1"><div><div><di=
v>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
o The inter-working between SRv6 and SR-MPLS.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
</div></div></div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D=
"#954F72"><div class=3D"m_7239376321292688603m_8993393139636520670WordSecti=
on1"><div><div><div><p class=3D"MsoNormal"><span style=3D"color:#1f497d">[L=
inda] o The inter-working between SR and legacy networks (which is far more=
 likely than SRv6 &amp; SR-MPLS interworking)</span></p></div></div></div><=
/div></div></blockquote><div><br></div><div>robjs&gt; The LDP interop draft=
 is something that is going to the IESG at the moment. There is existing wo=
rk in TEAS (in WGLC) that covers co-existence of RSVP-TE and SR. Are there =
specific areas that we have gaps? The reason that we call out SRv6/SR-MPLS =
interop is that there has been some discussion of this, and we have not got=
 an answer for this yet.</div><div><br></div><div>Thanks for the comments.<=
/div><div><br></div><div>Kind regards,</div><div>r.</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div c=
lass=3D"m_7239376321292688603m_8993393139636520670WordSection1">
</div></div></blockquote></div></div></div>

--000000000000a2019e056dc38dd6--


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From: Rob Shakir <robjs@google.com>
Date: Sun, 3 Jun 2018 14:36:24 -0700
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--0000000000009a73c8056dc39ce6
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Jeff,

Thanks for the comments.

On Fri, Jun 1, 2018 at 9:44 AM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

>
> The Source Packet Routing in NetworkinG (SPRING) Working Group is the hom=
e
> of
>
> Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6).
>
> [jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D
>

robjs> I don't think that SPRING should limit itself to having to just work
on dataplane technologies. The functional specifications or architectures
that are proposed are likely to span both data, control, and management
planes (e.g., YANG models, counter specifications). I'd be interested if
you disagree?

*snip*
>
>
>
> o Using SR
>
> [jeff] SR conveyed metadata perhaps? Think of BSID x-connect into another
> layer
>

robjs> I'd argue that this is more than metadata, it's really a forwarding
instruction that says to send to some other layer, or that is interpreted
in another domain. Metadata to me would mean information that we're
carrying on the packet that *isn't* used for forwarding.


> *snip*
>
>      * lsr on OSPF and IS-IS extensions to flood SPRING-related informati=
on
>
> [jeff] in RIFT we plan to support SR as well
>

robjs> This is probably RIFT co-ordinating with SPRING. I'd rather avoid
listing another protocol here without there being SPRING work that affects
it. Of course, please do involve SPRING in discussions of SR support in
RIFT.


> *snip*
>
>      * teas on generic traffic engineering architecture
>
> [jeff] rtgwg for fast convergence related topics
>

robjs> Thanks -- yes, given all the work in rtgwg on this topic, this
should definitely be added.

Thanks,
r.

--0000000000009a73c8056dc39ce6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Jeff,<div><br></div><div>Thanks for the comments.<br><d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Jun 1, 2018 at 9=
:44 AM Jeff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com">jefftan=
t.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><di=
v lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-298860=
2133635430672WordSection1"><p class=3D"MsoNormal"><br></p></div></div><div =
lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-29886021=
33635430672WordSection1"><div><div><div><p class=3D"MsoNormal"><span><span =
style=3D"font-family:&quot;Courier New&quot;">The Source Packet Routing in =
NetworkinG (SPRING) Working Group is the home of</span></span><span><u></u>=
<u></u></span></p></div></div></div></div></div><div lang=3D"EN-US" link=3D=
"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602133635430672WordSection=
1"><div><div><div><p class=3D"MsoNormal"><span><span style=3D"font-family:&=
quot;Courier New&quot;">Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 =
(SRv6).<u></u><u></u></span></span></p></div></div></div></div></div><div l=
ang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-298860213=
3635430672WordSection1"><div><div><div><p class=3D"MsoNormal"><span>[jeff] =
I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D</span></p></div></div></div></=
div></div></blockquote><div><br></div><div>robjs&gt; I don&#39;t think that=
 SPRING should limit itself to having to just work on dataplane technologie=
s. The functional specifications or architectures that are proposed are lik=
ely to span both data, control, and management planes (e.g., YANG models, c=
ounter specifications). I&#39;d be interested if you disagree?</div><div><b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"#0563C1"=
 vlink=3D"#954F72"><div class=3D"m_-2988602133635430672WordSection1"><p cla=
ss=3D"MsoNormal"><span><font face=3D"Courier New"><u></u><u></u></font></sp=
an></p><p class=3D"MsoNormal"><font face=3D"Courier New">*snip*</font></p><=
/div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div clas=
s=3D"m_-2988602133635430672WordSection1"><div><div><div><p class=3D"MsoNorm=
al"><span><u></u>=C2=A0<u></u></span></p></div></div></div></div></div><div=
 lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602=
133635430672WordSection1"><div><div><div><p class=3D"MsoNormal"><span><span=
 style=3D"font-family:&quot;Courier New&quot;">o Using SR<u></u><u></u></sp=
an></span></p><p class=3D"MsoNormal"><span>[jeff] SR conveyed metadata perh=
aps? Think of BSID x-connect into another layer</span></p></div></div></div=
></div></div></blockquote><div><br></div><div>robjs&gt; I&#39;d argue that =
this is more than metadata, it&#39;s really a forwarding instruction that s=
ays to send to some other layer, or that is interpreted in another domain. =
Metadata to me would mean information that we&#39;re carrying on the packet=
 that *isn&#39;t* used for forwarding.</div><div>=C2=A0</div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><di=
v class=3D"m_-2988602133635430672WordSection1"><div><div><div><p class=3D"M=
soNormal"><span><u></u><u></u></span></p></div></div></div></div></div><div=
 lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602=
133635430672WordSection1"><div><div><div><p class=3D"MsoNormal"><font face=
=3D"Courier New">*snip*</font></p></div></div></div></div></div><div lang=
=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-298860213363=
5430672WordSection1"><div><div><div><p class=3D"MsoNormal"><span><span styl=
e=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 * lsr on=
 OSPF and IS-IS extensions to flood SPRING-related information<u></u><u></u=
></span></span></p></div></div></div></div></div><div lang=3D"EN-US" link=
=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602133635430672WordSect=
ion1"><div><div><div><p class=3D"MsoNormal"><span>[jeff] in RIFT we plan to=
 support SR as well</span></p></div></div></div></div></div></blockquote><d=
iv><br></div><div>robjs&gt; This is probably RIFT co-ordinating with SPRING=
. I&#39;d rather avoid listing another protocol here without there being SP=
RING work that affects it. Of course, please do involve SPRING in discussio=
ns of SR support in RIFT.</div><div>=C2=A0</div><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_=
-2988602133635430672WordSection1"><div><div><div><p class=3D"MsoNormal"><sp=
an><u></u><u></u></span></p></div></div></div></div></div><div lang=3D"EN-U=
S" link=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602133635430672W=
ordSection1"><div><div><div><p class=3D"MsoNormal"><font face=3D"Courier Ne=
w">*snip*</font></p></div></div></div></div></div><div lang=3D"EN-US" link=
=3D"#0563C1" vlink=3D"#954F72"><div class=3D"m_-2988602133635430672WordSect=
ion1"><div><div><div><p class=3D"MsoNormal"><span><span style=3D"font-famil=
y:&quot;Courier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0 * teas on generic traff=
ic engineering architecture<u></u><u></u></span></span></p></div></div></di=
v></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><div c=
lass=3D"m_-2988602133635430672WordSection1"><div><div><div><p class=3D"MsoN=
ormal"><span>[jeff] rtgwg for fast convergence related topics</span></p></d=
iv></div></div></div></div></blockquote><div><br></div><div>robjs&gt; Thank=
s -- yes, given all the work in rtgwg on this topic, this should definitely=
 be added.</div><div><br></div><div>Thanks,</div><div>r.</div><div><br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex">
</blockquote></div></div></div></div>

--0000000000009a73c8056dc39ce6--


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Thread-Topic: Updating the SPRING WG Charter
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From: Rob Shakir <robjs@google.com>
Date: Mon, 4 Jun 2018 09:12:07 -0700
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To: Xiejingrong <xiejingrong@huawei.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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Content-Type: text/plain; charset="UTF-8"

Hi Jingrong,

On Sun, Jun 3, 2018 at 7:44 PM Xiejingrong <xiejingrong@huawei.com> wrote:

> Will SPRING consider multicast/BIER being included ? These are some
> reasons I am thinking about:
>
> (1) multicast/multipoint-transfer is always a requirement for internet
> service, and is always requiring some unicast technology as a precursor.
>
> (2) there is already a similar WG BIER to considering the similar
> stateless solution for multicast for long-term.
>
> (3) there is already some consideration about multipoint SR in
> segment-routing-policy draft for a long time.
>
> (4) there is already some consideration about combining BIER and SR in
> bier-6man-encapsulation draft.
>
> (5) it had been mentioned in ietf101 London to consider cooperating with
> BIER for some purpose.
>

robjs> IMHO, if BIER leverages SR work this should be in liaison with
SPRING, but I do not expect there to be any BIER related work in SPRING
itself. If this needs changes to dataplanes, then the relevnat working
group (mpls, or 6man) should be involved too.

robjs> It is my personal opinion that the SR-TE policy draft needs to be a
constrained set of problems. It had become a collect-your-use-case
document. Part of the ask of breaking the document down is so that we can
produce a clear, succinct set of documents. Until such time as there are
concrete proposals on multicast in SR that SPRING needs to consider (i.e.,
require a new functional specification, ratheror architectural extension)
then I would aim to err on the side of keeping the charter clear, rather
than collecting all possible use cases in it.

robjs> Please disagree with me if there is a benefit to having this in the
charter that I'm missing.

Thanks,
r.

--000000000000b0d915056dd332ed
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Jingrong,<br><br><div class=3D"gmail_quote"><div dir=3D=
"ltr">On Sun, Jun 3, 2018 at 7:44 PM Xiejingrong &lt;<a href=3D"mailto:xiej=
ingrong@huawei.com">xiejingrong@huawei.com</a>&gt; wrote:</div><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72"><=
div class=3D"m_4274600537303808048WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Will SPRING consider m=
ulticast/BIER being included ? These are some reasons I am thinking about:<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">(1) multicast/multipoi=
nt-transfer is always a requirement for internet service, and is always req=
uiring some unicast technology as a precursor.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">(2) there is already a=
 similar WG BIER to considering the similar stateless solution for multicas=
t for long-term.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">(3) there is already s=
ome consideration about multipoint SR in segment-routing-policy draft for a=
 long time.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">(4) there is already s=
ome consideration about combining BIER and SR in bier-6man-encapsulation dr=
aft.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">(5) it had been mentio=
ned in ietf101 London to consider cooperating with BIER for some purpose.</=
span></p></div></div></blockquote><div><br></div><div>robjs&gt; IMHO, if BI=
ER leverages SR work this should be in liaison with SPRING, but I do not ex=
pect there to be any BIER related work in SPRING itself. If this needs chan=
ges to dataplanes, then the relevnat working group (mpls, or 6man) should b=
e involved too.</div><div><br></div><div>robjs&gt; It is my personal opinio=
n that the SR-TE policy draft needs to be a constrained set of problems. It=
 had become a collect-your-use-case document. Part of the ask of breaking t=
he document down is so that we can produce a clear, succinct set of documen=
ts. Until such time as there are concrete proposals on multicast in SR that=
 SPRING needs to consider (i.e., require a new functional specification, ra=
theror architectural extension) then I would aim to err on the side of keep=
ing the charter clear, rather than collecting all possible use cases in it.=
</div><div><br></div><div>robjs&gt; Please disagree with me if there is a b=
enefit to having this in the charter that I&#39;m missing.</div><div><br></=
div><div>Thanks,</div><div>r.=C2=A0=C2=A0</div></div></div>

--000000000000b0d915056dd332ed--


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From: Rob Shakir <robjs@google.com>
Date: Mon, 4 Jun 2018 09:13:02 -0700
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Subject: [spring] Fwd: IPR Poll for draft-filsfils-spring-segment-routing-policy
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--000000000000134546056dd3361d
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi All,

For some reason, Steven's mail didn't make it to the SPRING list.

Kind regards,
r.

---------- Forwarded message ---------
From: Steven Lin <stevenlin@google.com>
Date: Wed, May 30, 2018 at 8:24 AM
Subject: Re: [spring] IPR Poll for
draft-filsfils-spring-segment-routing-policy
To: Kamran Raza (skraza) <skraza@cisco.com>, Rob Shakir <robjs@google.com>,
SPRING WG List <spring@ietf.org>
Cc: Bruno Decraene <bruno.decraene@orange.com>,
draft-filsfils-spring-segment-routing-policy@ietf.org <
draft-filsfils-spring-segment-routing-policy@ietf.org>


I am not aware of any IPR for this draft.

On 05/24/2018 02:46 PM, Kamran Raza (skraza) wrote:

I am also not aware of any other IPRs than the ones already disclosed under
datatracker (
https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-filsfils=
-spring-segment-routing-policy
)



Rgds,

--

Kamran



*From: *"Francois Clad (fclad)" <fclad@cisco.com> <fclad@cisco.com>
*Date: *Tuesday, May 22, 2018 at 3:06 AM
*To: *Rob Shakir <robjs@google.com> <robjs@google.com>, SPRING WG List
<spring@ietf.org> <spring@ietf.org>
*Cc: *Bruno Decraene <bruno.decraene@orange.com> <bruno.decraene@orange.com=
>,
"draft-filsfils-spring-segment-routing-policy@ietf.org"
<draft-filsfils-spring-segment-routing-policy@ietf.org>
<draft-filsfils-spring-segment-routing-policy@ietf.org>
<draft-filsfils-spring-segment-routing-policy@ietf.org>
*Subject: *Re: [spring] IPR Poll for
draft-filsfils-spring-segment-routing-policy



I=E2=80=99m not aware of any IPR other than already disclosed at
https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-filsfils=
-spring-segment-routing-policy



Francois



On 16 May 2018, at 18:15, bruno.decraene@orange.com wrote:



[+ authors]



I'm not aware of any IPR that applies to this draft



--Bruno



*From:* spring [mailto:spring-bounces@ietf.org <spring-bounces@ietf.org>] *=
On
Behalf Of *Rob Shakir
*Sent:* Wednesday, May 16, 2018 5:20 PM
*To:* SPRING WG List
*Subject:* [spring] IPR Poll for
draft-filsfils-spring-segment-routing-policy



Hi SPRING WG,



In parallel to the call for adoption
for draft-filsfils-spring-segment-routing-policy, we would like to poll for
IPR.



If you are aware of IPR that applies
to draft-filsfils-spring-segment-routing-policy please respond to this
email. If you are aware of IPR, please indicate whether it has been
disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378
provide more details).



If you are an *author or contributor* please respond to this email
regardless of whether or not you're aware of any IPR. If you are not an
author or contributor, please explicitly respond only if you are aware of
IPR that has not yet been disclosed.



This document will not advance into the working group until IPR
confirmations have been received from all authors and contributors.



Thanks,

Bruno & Rob.

___________________________________________________________________________=
______________________________________________



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--=20
Steven Lin
Google

--000000000000134546056dd3361d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi All,<div><br></div><div>For some reason, Steven&#39;s m=
ail didn&#39;t make it to the SPRING list.=C2=A0</div><div><br></div><div>K=
ind regards,</div><div>r.<br><br><div class=3D"gmail_quote"><div dir=3D"ltr=
">---------- Forwarded message ---------<br>From: Steven Lin &lt;<a href=3D=
"mailto:stevenlin@google.com">stevenlin@google.com</a>&gt;<br>Date: Wed, Ma=
y 30, 2018 at 8:24 AM<br>Subject: Re: [spring] IPR Poll for draft-filsfils-=
spring-segment-routing-policy<br>To: Kamran Raza (skraza) &lt;<a href=3D"ma=
ilto:skraza@cisco.com">skraza@cisco.com</a>&gt;, Rob Shakir &lt;<a href=3D"=
mailto:robjs@google.com">robjs@google.com</a>&gt;, SPRING WG List &lt;<a hr=
ef=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;<br>Cc: Bruno Decraene=
 &lt;<a href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.com=
</a>&gt;, <a href=3D"mailto:draft-filsfils-spring-segment-routing-policy@ie=
tf.org">draft-filsfils-spring-segment-routing-policy@ietf.org</a> &lt;<a hr=
ef=3D"mailto:draft-filsfils-spring-segment-routing-policy@ietf.org">draft-f=
ilsfils-spring-segment-routing-policy@ietf.org</a>&gt;<br></div><br><br>
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF">
    <p>I am not aware of any IPR for this draft.<br>
    </p></div><div text=3D"#000000" bgcolor=3D"#FFFFFF">
    <br>
    <div class=3D"m_8510921223370130257moz-cite-prefix">On 05/24/2018 02:46=
 PM, Kamran Raza
      (skraza) wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
     =20
     =20
      <div class=3D"m_8510921223370130257WordSection1">
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US">I am also not aware of any oth=
er IPRs than the
            ones already disclosed under datatracker (</span><a href=3D"htt=
ps://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-filsfil=
s-spring-segment-routing-policy" target=3D"_blank">https://datatracker.ietf=
.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-filsfils-spring-segment-rout=
ing-policy</a>)<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot=
;,sans-serif" lang=3D"EN-US"><u></u><u></u></span></p>
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p=
>
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US">Rgds,<u></u><u></u></span></p>
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US">--<u></u><u></u></span></p>
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US">Kamran<u></u><u></u></span></p=
>
        <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:=
&quot;Arial&quot;,sans-serif" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p=
>
        <div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.=
0pt 0cm 0cm 0cm">
          <p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:b=
lack">From: </span></b><span style=3D"font-size:12.0pt;color:black">&quot;F=
rancois Clad
              (fclad)&quot; <a class=3D"m_8510921223370130257moz-txt-link-r=
fc2396E" href=3D"mailto:fclad@cisco.com" target=3D"_blank">&lt;fclad@cisco.=
com&gt;</a><br>
              <b>Date: </b>Tuesday, May 22, 2018 at 3:06 AM<br>
              <b>To: </b>Rob Shakir <a class=3D"m_8510921223370130257moz-tx=
t-link-rfc2396E" href=3D"mailto:robjs@google.com" target=3D"_blank">&lt;rob=
js@google.com&gt;</a>, SPRING WG
              List <a class=3D"m_8510921223370130257moz-txt-link-rfc2396E" =
href=3D"mailto:spring@ietf.org" target=3D"_blank">&lt;spring@ietf.org&gt;</=
a><br>
              <b>Cc: </b>Bruno Decraene
              <a class=3D"m_8510921223370130257moz-txt-link-rfc2396E" href=
=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">&lt;bruno.decraene@=
orange.com&gt;</a>,
              <a class=3D"m_8510921223370130257moz-txt-link-rfc2396E" href=
=3D"mailto:draft-filsfils-spring-segment-routing-policy@ietf.org" target=3D=
"_blank">&quot;draft-filsfils-spring-segment-routing-policy@ietf.org&quot;<=
/a>
              <a class=3D"m_8510921223370130257moz-txt-link-rfc2396E" href=
=3D"mailto:draft-filsfils-spring-segment-routing-policy@ietf.org" target=3D=
"_blank">&lt;draft-filsfils-spring-segment-routing-policy@ietf.org&gt;</a><=
br>
              <b>Subject: </b>Re: [spring] IPR Poll for
              draft-filsfils-spring-segment-routing-policy<u></u><u></u></s=
pan></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
        </div>
        <p class=3D"MsoNormal"><a name=3D"m_8510921223370130257__MailOrigin=
alBody">I=E2=80=99m not aware of any IPR other than
            already disclosed at=C2=A0</a><a href=3D"https://datatracker.ie=
tf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-filsfils-spring-segment-ro=
uting-policy" target=3D"_blank"><span>https://datatracker.ietf.org/ipr/sear=
ch/?submit=3Ddraft&amp;id=3Ddraft-filsfils-spring-segment-routing-policy</s=
pan><span></span></a><span>
            <u></u><u></u></span></p>
        <div>
          <p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
        </div>
        <div>
          <p class=3D"MsoNormal"><span>Francois<u></u><u></u></span></p>
          <div>
            <p class=3D"MsoNormal"><span><br>
                <br>
                <u></u><u></u></span></p>
            <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
              <div>
                <p class=3D"MsoNormal"><span>On 16 May
                    2018, at 18:15,
                  </span><a href=3D"mailto:bruno.decraene@orange.com" targe=
t=3D"_blank"><span>bruno.decraene@orange.com</span><span></span></a><span> =
wrote:<u></u><u></u></span></p>
              </div>
              <p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
              <div>
                <div>
                  <p class=3D"MsoNormal"><span><span lang=3D"EN-US">[+ auth=
ors]</span></span><span><span><u></u><u></u></span></span></p>
                </div>
                <div>
                  <p class=3D"MsoNormal"><span><span lang=3D"EN-US">=C2=A0<=
/span></span><span><span><u></u><u></u></span></span></p>
                </div>
                <div>
                  <p class=3D"MsoNormal"><span><span lang=3D"EN-US">I&#39;m=
 not
                        aware of any IPR that applies to this draft</span><=
/span><span><span><u></u><u></u></span></span></p>
                </div>
                <div>
                  <p class=3D"MsoNormal"><span><span style=3D"font-size:10.=
0pt;font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-US">=C2=A0</span><=
/span><span><span><u></u><u></u></span></span></p>
                </div>
                <div>
                  <p class=3D"MsoNormal"><span><span style=3D"font-size:10.=
0pt;font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-US">--Bruno</span>=
</span><span><span><u></u><u></u></span></span></p>
                </div>
                <div>
                  <p class=3D"MsoNormal"><span><span style=3D"font-size:10.=
0pt;font-family:&quot;Arial&quot;,sans-serif" lang=3D"EN-US">=C2=A0</span><=
/span><span><span><u></u><u></u></span></span></p>
                </div>
                <div style=3D"border:none;border-left:solid blue 1.5pt;padd=
ing:0cm 0cm 0cm 4.0pt">
                  <div>
                    <div style=3D"border:none;border-top:solid #b5c4df 1.0p=
t;padding:3.0pt 0cm 0cm 0cm">
                      <div>
                        <p class=3D"MsoNormal"><span><b><span style=3D"font=
-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif" lang=3D"EN-US">From=
:</span></b></span><span><span class=3D"m_8510921223370130257apple-converte=
d-space"><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,san=
s-serif" lang=3D"EN-US">=C2=A0</span></span></span><span><span style=3D"fon=
t-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif" lang=3D"EN-US">spr=
ing [</span></span><a href=3D"mailto:spring-bounces@ietf.org" target=3D"_bl=
ank"><span><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,s=
ans-serif;color:purple" lang=3D"EN-US">mailto:spring-bounces@ietf.org</span=
></span><span></span></a><span><span style=3D"font-size:10.0pt;font-family:=
&quot;Tahoma&quot;,sans-serif" lang=3D"EN-US">]<span class=3D"m_85109212233=
70130257apple-converted-space">=C2=A0</span><b>On
                                Behalf Of<span class=3D"m_85109212233701302=
57apple-converted-space">=C2=A0</span></b>Rob
                              Shakir<br>
                              <b>Sent:</b><span class=3D"m_8510921223370130=
257apple-converted-space">=C2=A0</span>Wednesday,
                              May 16, 2018 5:20 PM<br>
                              <b>To:</b><span class=3D"m_851092122337013025=
7apple-converted-space">=C2=A0</span>SPRING
                              WG List<br>
                              <b>Subject:</b><span class=3D"m_8510921223370=
130257apple-converted-space">=C2=A0</span>[spring]
                              IPR Poll for
                              draft-filsfils-spring-segment-routing-policy<=
/span></span><span><span style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,serif"><u></u><u></u></span></span></p>
                      </div>
                    </div>
                  </div>
                  <div>
                    <p class=3D"MsoNormal"><span><span lang=3D"EN-US">=C2=
=A0</span></span><span><span><u></u><u></u></span></span></p>
                  </div>
                  <div>
                    <div>
                      <p class=3D"MsoNormal"><span><span>Hi SPRING WG,<u></=
u><u></u></span></span></p>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">=C2=A0<u></u><u></=
u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">In
                              parallel to the call for adoption
                              for=C2=A0draft-filsfils-spring-segment-routin=
g-policy,
                              we would like to poll for IPR.<u></u><u></u><=
/span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">=C2=A0<u></u><u></=
u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">If
                              you are aware of IPR that applies
                              to=C2=A0draft-filsfils-spring-segment-routing=
-policy
                              please respond to this email. If you are
                              aware of IPR, please indicate whether it
                              has been disclosed in accordance with IETF
                              IPR rules (RFCs 3979, 4879, 3669 and 5378
                              provide more details).<u></u><u></u></span></=
span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">=C2=A0<u></u><u></=
u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">If
                              you are an<span class=3D"m_851092122337013025=
7apple-converted-space">=C2=A0</span><b>author
                                or contributor</b>=C2=A0please respond to
                              this email regardless of whether or not
                              you&#39;re aware of any IPR. If you are not a=
n
                              author or contributor, please explicitly
                              respond only if you are aware of IPR that
                              has not yet been disclosed.<u></u><u></u></sp=
an></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">=C2=A0<u></u><u></=
u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">This
                              document will not advance into the working
                              group until IPR confirmations have been
                              received from all authors and
                              contributors.<u></u><u></u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">=C2=A0<u></u><u></=
u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">Thanks,<u></u><u><=
/u></span></span></p>
                      </div>
                    </div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span><span style=3D"font-si=
ze:12.0pt;font-family:&quot;Times New Roman&quot;,serif">Bruno
                              &amp; Rob.<u></u><u></u></span></span></p>
                      </div>
                    </div>
                  </div>
                </div>
                <pre style=3D"font-variant-caps:normal;text-align:start;wor=
d-spacing:0px"><span><span style=3D"font-size:10.5pt">_____________________=
___________________________________________________________________________=
_________________________<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt"><u></u>=C2=A0<u=
></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">Ce message et s=
es pieces jointes peuvent contenir des informations confidentielles ou priv=
ilegiees et ne doivent donc<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">pas etre diffus=
es, exploites ou copies sans autorisation. Si vous avez recu ce message par=
 erreur, veuillez le signaler<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">a l&#39;expedit=
eur et le detruire ainsi que les pieces jointes. Les messages electroniques=
 etant susceptibles d&#39;alteration,<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">Orange decline =
toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci=
.<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt"><u></u>=C2=A0<u=
></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">This message an=
d its attachments may contain confidential or privileged information that m=
ay be protected by law;<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">they should not=
 be distributed, used or copied without authorisation.<u></u><u></u></span>=
</span></pre>
                <pre><span><span style=3D"font-size:10.5pt">If you have rec=
eived this email in error, please notify the sender and delete this message=
 and its attachments.<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">As emails may b=
e altered, Orange is not liable for messages that have been modified, chang=
ed or falsified.<u></u><u></u></span></span></pre>
                <pre><span><span style=3D"font-size:10.5pt">Thank you.<u></=
u><u></u></span></span></pre>
              </div>
            </blockquote>
          </div>
          <p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
        </div>
      </div>
    </blockquote>
    <br>
    </div><div text=3D"#000000" bgcolor=3D"#FFFFFF"><pre class=3D"m_8510921=
223370130257moz-signature" cols=3D"72">--=20
Steven Lin
Google</pre>
  </div></div></div></div>

--000000000000134546056dd3361d--


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From: <stephane.litkowski@orange.com>
To: DECRAENE Bruno IMT/OLN <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>, "draft-ietf-spring-segment-routing-mpls@ietf.org" <draft-ietf-spring-segment-routing-mpls@ietf.org>
Thread-Topic: IPR Poll for draft-ietf-spring-segment-routing-mpls
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Date: Mon, 4 Jun 2018 16:22:36 +0000
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Subject: Re: [spring] IPR Poll for draft-ietf-spring-segment-routing-mpls
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Hi,

I'm not aware of any IPR

From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
Sent: Thursday, May 24, 2018 19:28
To: SPRING WG List; draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: IPR Poll for draft-ietf-spring-segment-routing-mpls

Hi SPRING WG,

In parallel to the WGLC for draft-ietf-spring-segment-routing-mpls, we woul=
d like to poll for IPR.

If you are aware of IPR that applies to draft-ietf-spring-segment-routing-m=
pls please respond to this email. If you are aware of IPR, please indicate =
whether it has been
disclosed in accordance with IETF IPR rules (RFCs 3979, 4879, 3669 and 5378=
 provide more details).

If you are an *author or contributor* please respond to this email regardle=
ss of whether or not you're aware of any IPR. If you are not an author or c=
ontributor, please explicitly respond only if you are aware of IPR that has=
 not yet been disclosed.

This document will not advance until IPR confirmations have been received f=
rom all authors and contributors.

Thanks,
Bruno & Rob.


___________________________________________________________________________=
______________________________________________



Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc

pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler

a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,

Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.



This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;

they should not be distributed, used or copied without authorisation.

If you have received this email in error, please notify the sender and dele=
te this message and its attachments.

As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.

Thank you.

___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I&#8217;m not aware of=
 any IPR<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> bruno.de=
craene@orange.com [mailto:bruno.decraene@orange.com]
<br>
<b>Sent:</b> Thursday, May 24, 2018 19:28<br>
<b>To:</b> SPRING WG List; draft-ietf-spring-segment-routing-mpls@ietf.org<=
br>
<b>Subject:</b> IPR Poll for draft-ietf-spring-segment-routing-mpls<o:p></o=
:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">Hi SPRING WG,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">In parallel to the WGLC for draft-=
ietf-spring-segment-routing-mpls, we would like to poll for IPR.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">If you are aware of IPR that appli=
es to draft-ietf-spring-segment-routing-mpls please respond to this email. =
If you are aware of IPR, please indicate whether
 it has been<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">disclosed in accordance with IETF =
IPR rules (RFCs 3979, 4879, 3669 and 5378 provide more details).<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">If you are an *author or contribut=
or* please respond to this email regardless of whether or not you're aware =
of any IPR. If you are not an author or contributor,
 please explicitly respond only if you are aware of IPR that has not yet be=
en disclosed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR">This document will not advance unt=
il IPR confirmations have been received from all authors and contributors.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;mso-fareast-language:FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-fareast-language:FR">Thanks,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Courier New&quot;;mso-fareast-language:FR">Bruno &amp; Rob.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
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From: Rob Shakir <robjs@google.com>
Date: Mon, 4 Jun 2018 09:44:58 -0700
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To: Michael McBride <Michael.McBride@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/-TFxOoXuQjH8ENZ83T2Zbq_yb_Y>
Subject: Re: [spring] Updating the SPRING WG Charter
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--0000000000003a4ada056dd3a87d
Content-Type: text/plain; charset="UTF-8"

Michael,

Thanks for the comment.

On Mon, Jun 4, 2018 at 9:42 AM Michael McBride <Michael.McBride@huawei.com>
wrote:

> It would be helpful, while updating the charter, to state whether
> multicast in SR is in/out of scope in order to know which wg to take our
> future work.
>

I think this is impractical. If we state everything that is in or out of
scope, we'll end up with a laundry list. The aim of the charter is to
define clearly the work that the WG should focus on. It does not mean that
we can never host discussion of individual drafts if they are relevant. If
there are requirements, we can always recharter if something new becomes
the highest priority for the industry w.r.t SR.

Kind regards,
r.

--0000000000003a4ada056dd3a87d
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Michael,<div><br></div><div>Thanks for the comment.<br><br=
><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Jun 4, 2018 at 9:42 AM=
 Michael McBride &lt;<a href=3D"mailto:Michael.McBride@huawei.com">Michael.=
McBride@huawei.com</a>&gt; wrote:</div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_4867912433294=
353133WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">It would be helpful, while updating t=
he charter, to state whether multicast in SR is in/out of scope in order to=
 know which wg to take our future work.</span>=C2=A0</p></div></div></block=
quote><div><br></div><div>I think this is impractical. If we state everythi=
ng that is in or out of scope, we&#39;ll end up with a laundry list. The ai=
m of the charter is to define clearly the work that the WG should focus on.=
 It does not mean that we can never host discussion of individual drafts if=
 they are relevant. If there are requirements, we can always recharter if s=
omething new becomes the highest priority for the industry w.r.t SR.</div><=
div><br></div><div>Kind regards,</div><div>r.</div></div></div></div>

--0000000000003a4ada056dd3a87d--


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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-ldp-interop-12.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing interworking with LDP
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Stefano Previdi
                          Bruno Decraene
                          Stephane Litkowski
	Filename        : draft-ietf-spring-segment-routing-ldp-interop-12.txt
	Pages           : 23
	Date            : 2018-06-05

Abstract:
   A Segment Routing (SR) node steers a packet through a controlled set
   of instructions, called segments, by prepending the packet with an SR
   header.  A segment can represent any instruction, topological or
   service-based.  SR allows to enforce a flow through any topological
   path while maintaining per-flow state only at the ingress node to the
   SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   data plane with no change in the forwarding plane.  This document
   describes how Segment Routing operates in a network where LDP is
   deployed and in the case where SR-capable and non-SR-capable nodes
   coexist.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-ldp-interop-12
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-ldp-interop-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-ldp-interop-12


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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To: Joel Halpern Direct <jmh.direct@joelhalpern.com>, gen-art@ietf.org
Cc: draft-ietf-spring-segment-routing-ldp-interop.all@ietf.org, spring@ietf.org, ietf@ietf.org
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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
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Date: Tue, 5 Jun 2018 09:04:29 -0700
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Subject: Re: [spring] Genart last call review of draft-ietf-spring-segment-routing-ldp-interop-11
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thanks for the review again

IÂ  uploaded version 12 of the draft containing section 4.2.1 giving an 
overview of the mapping server

Thanks

Ahmed

On 5/21/18 9:13 AM, Joel Halpern Direct wrote:
> Thank you.Â  I apologize for missing the other normative items.Â  With 
> those, plus the elaboration on the SRMS, the status as PS makes good 
> sense.
>
> Yours,
> Joel
>
> On 5/21/18 11:45 AM, Ahmed Bashandy wrote:
>> Thanks a lot for the review
>>
>> The document specifies externally visible behavior that must be 
>> implemented by routers, otherwise SR and LDP routers cannot talk to 
>> each other. For example, section 4.2.2Â  specifies preference rules. 
>> Another example is the last two paragraphs in section 4.2.1. Hence I 
>> do not think it can be informational. A third example is section 4.2 
>> which requires the existence of one SRMS in order for SR-only to 
>> speak to LDP-only routers
>>
>> But I agree that a more crisp description of SRMS is warranted. I 
>> will add a section describing the SRMS functionality and specifying 
>> what to do when receiving both prefix-SID sub-tlv and SRMS 
>> advertisements in the next version, which I plan to send out in the 
>> next few days
>>
>>
>> Ahmed
>>
>>
>>
>> On 5/14/18 1:01 PM, Joel Halpern wrote:
>>> Reviewer: Joel Halpern
>>> Review result: Ready with Issues
>>>
>>> I am the assigned Gen-ART reviewer for this draft. The General Area
>>> Review Team (Gen-ART) reviews all IETF documents being processed
>>> by the IESG for the IETF Chair.Â  Please treat these comments just
>>> like any other last call comments.
>>>
>>> For more information, please see the FAQ at
>>>
>>> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>>>
>>> Document: draft-ietf-spring-segment-routing-ldp-interop-11
>>> Reviewer: Joel Halpern
>>> Review Date: 2018-05-14
>>> IETF LC End Date: 2018-05-24
>>> IESG Telechat date: Not scheduled for a telechat
>>>
>>> Summary: This document appears to be ready for publication as an 
>>> RFC.Â  The
>>> question of whether it is an Informational RFC or a Proposed 
>>> Standards track
>>> RFC is one that the ADs should examine.
>>>
>>> Major issues:
>>> Â Â Â Â  This document is quite readable, and quite useful.Â  If my 
>>> reading below
>>> Â Â Â Â  (minor comment about section 4.2) is wrong, then everything is 
>>> fine.
>>> Â Â Â Â  However, reading the text, it does not appear to define SRMS.Â  
>>> Rather, it
>>> Â Â Â Â  describes a good way to use SRMS to achive smooth SR - LDP 
>>> integration and
>>> Â Â Â Â  migration.Â  As such, this seems to me to be a really good 
>>> Informational
>>> Â Â Â Â  Document.
>>>
>>> Minor issues:
>>> Â Â Â Â  Section 4.2 states that it defines the SRMS (Segment Routing 
>>> Mapping
>>> Â Â Â Â  Server).Â  Looking at the relevant routing protocol document, 
>>> they point to
>>> https://tools.ietf.org/html/draft-ietf-spring-conflict-resolution-05 
>>> as the
>>> Â Â Â Â  defining source for the SRMS.Â  And that document does appear to 
>>> define the
>>> Â Â Â Â  SRMS.
>>>
>>> Nits/editorial comments:
>>>
>>>
>>


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Subject: [spring] [Editorial Errata Reported] RFC8355 (5380)
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The following errata report has been submitted for RFC8355,
"Resiliency Use Cases in Source Packet Routing in Networking (SPRING) Networks".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5380

--------------------------------------
Type: Editorial
Reported by: James Bensley <jwbensley@gmail.com>

Section: 3.2

Original Text
-------------
An alternative protection strategy consists in management-free local
   protection that is aimed at providing a repair for the destination
   based on the shortest path to the destination.

Corrected Text
--------------
An alternative protection strategy exists in management-free local
 protection

Notes
-----


Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC8355 (draft-ietf-spring-resiliency-use-cases-12)
--------------------------------------
Title               : Resiliency Use Cases in Source Packet Routing in Networking (SPRING) Networks
Publication Date    : March 2018
Author(s)           : C. Filsfils, Ed., S. Previdi, Ed., B. Decraene, R. Shakir
Category            : INFORMATIONAL
Source              : Source Packet Routing in Networking
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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From: James Bensley <jwbensley@gmail.com>
Date: Wed, 6 Jun 2018 08:53:12 +0100
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Subject: Re: [spring] [Editorial Errata Reported] RFC8355 (5380)
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On 6 June 2018 at 08:21, RFC Errata System <rfc-editor@rfc-editor.org> wrote:
> Original Text
> -------------
> An alternative protection strategy consists in

Alternatively, "consists of", is "in" the wrong preposition here?

Kind regards,
James.


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From: Rob Shakir <robjs@google.com>
Date: Wed, 6 Jun 2018 01:00:10 -0700
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To: James Bensley <jwbensley@gmail.com>
Cc: RFC Errata System <rfc-editor@rfc-editor.org>, cfilsfil@cisco.com, stefano@previdi.net,  bruno.decraene@orange.com, db3546@att.com, aretana.ietf@gmail.com,  martin.vigoureux@nokia.com, spring@ietf.org
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Subject: Re: [spring] [Editorial Errata Reported] RFC8355 (5380)
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Hi James,

Thanks for reporting this.

I think that "consists in" is actually what is meant here. The Cambridge
dictionary
<https://dictionary.cambridge.org/dictionary/english/consist-in-sth> definition
is a useful reference.

IMHO, the intention of this sentence is to say that the important/necessary
characteristic of the alternate strategy is that it provides protection
along the shortest path. This might not be the most common English, but it
does seem to be correct.

The RFC Editor folks are likely to be the experts here -- I'd welcome their
comment too.

Thanks,
r.

On Wed, Jun 6, 2018 at 12:53 AM James Bensley <jwbensley@gmail.com> wrote:

> On 6 June 2018 at 08:21, RFC Errata System <rfc-editor@rfc-editor.org>
> wrote:
> > Original Text
> > -------------
> > An alternative protection strategy consists in
>
> Alternatively, "consists of", is "in" the wrong preposition here?
>
> Kind regards,
> James.
>

--00000000000006db93056df48f24
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi James,</div><div><br></div><div>Thanks for reporti=
ng this.</div><div><br></div>I think that &quot;consists in&quot; is actual=
ly what is meant here. The <a href=3D"https://dictionary.cambridge.org/dict=
ionary/english/consist-in-sth">Cambridge dictionary</a>=C2=A0definition is =
a useful reference.<div><br></div><div>IMHO, the intention of this sentence=
 is to say that the important/necessary characteristic of the alternate str=
ategy is that it provides protection along the shortest path. This might no=
t be the most common English, but it does seem to be correct.</div><div><br=
></div><div>The RFC Editor folks are likely to be the experts here -- I&#39=
;d welcome their comment too.</div><div><br></div><div>Thanks,</div><div>r.=
</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Jun 6, =
2018 at 12:53 AM James Bensley &lt;<a href=3D"mailto:jwbensley@gmail.com">j=
wbensley@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">O=
n 6 June 2018 at 08:21, RFC Errata System &lt;<a href=3D"mailto:rfc-editor@=
rfc-editor.org" target=3D"_blank">rfc-editor@rfc-editor.org</a>&gt; wrote:<=
br>
&gt; Original Text<br>
&gt; -------------<br>
&gt; An alternative protection strategy consists in<br>
<br>
Alternatively, &quot;consists of&quot;, is &quot;in&quot; the wrong preposi=
tion here?<br>
<br>
Kind regards,<br>
James.<br>
</blockquote></div>

--00000000000006db93056df48f24--


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To: Tomonori Takeda <tomonori.takeda@ntt.com>, "'rtg-ads@ietf.org'" <rtg-ads@ietf.org>
Cc: "'spring@ietf.org'" <spring@ietf.org>, "'rtg-dir@ietf.org'" <rtg-dir@ietf.org>, "'draft-ietf-spring-segment-routing-ldp-interop.all@ietf.org'" <draft-ietf-spring-segment-routing-ldp-interop.all@ietf.org>
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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
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Subject: Re: [spring] RtgDir review: draft-ietf-spring-segment-routing-ldp-interop-11
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thanks a lot for the review

I will address your comments in the next few days


Ahmed



On 5/26/18 8:47 AM, Tomonori Takeda wrote:
> I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see â€‹http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir  
>
> Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft.
>
>   Document: draft-ietf-spring-segm


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Hi Rob and James,

Regarding =93consist in=94:

While this construction appears in past RFCs and is not incorrect, we =
find a number of readers are not=20
familiar with it and think that an error exists.  We would not update =
text that uses it appropriately;
however, the familiarity issue may be something to keep in mind for =
future writing.

Please let us know if we can be of further assistance.

RFC Editor/mf



On Jun 6, 2018, at 1:00 AM, Rob Shakir <robjs@google.com> wrote:

> Hi James,
>=20
> Thanks for reporting this.
>=20
> I think that "consists in" is actually what is meant here. The =
Cambridge dictionary definition is a useful reference.
>=20
> IMHO, the intention of this sentence is to say that the =
important/necessary characteristic of the alternate strategy is that it =
provides protection along the shortest path. This might not be the most =
common English, but it does seem to be correct.
>=20
> The RFC Editor folks are likely to be the experts here -- I'd welcome =
their comment too.
>=20
> Thanks,
> r.
>=20
> On Wed, Jun 6, 2018 at 12:53 AM James Bensley <jwbensley@gmail.com> =
wrote:
> On 6 June 2018 at 08:21, RFC Errata System <rfc-editor@rfc-editor.org> =
wrote:
> > Original Text
> > -------------
> > An alternative protection strategy consists in
>=20
> Alternatively, "consists of", is "in" the wrong preposition here?
>=20
> Kind regards,
> James.


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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Linda Dunbar <linda.dunbar@huawei.com>
CC: Jeff Tantsura <jefftant.ietf@gmail.com>, SPRING WG List <spring@ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Wed, 6 Jun 2018 18:41:13 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
Thread-Index: AdP56p5QOgEqtjT0TPyaFDKrNzAuwABwo3NQACTI6YAAAQilgAAAHQ4AAGFqSQA=
Date: Wed, 6 Jun 2018 19:14:16 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: tsv-art@ietf.org, spring@ietf.org, Gaurav Dawra <gdawra.ietf@gmail.com>, =?UTF-8?Q?Mirja_K=c3=bchlewind?= <ietf@kuehlewind.net>
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From: Martin Stiemerling <mls.ietf@gmail.com>
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Date: Wed, 6 Jun 2018 21:14:41 +0200
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Subject: Re: [spring] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08
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Hi Alvaro, all,

Thanks for addressing my concerns.

This version is good to go from my side.

Kind regards,

   ;Martin

Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> Martin:
> 
> Hi!Â  How are you?
> 
> Gaurav just posted a revision.Â  Please take a look and let us know if 
> the changes address your concerns or not.
> 
> https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-msdc-09
> 
> Thanks!!
> 
> Alvaro.
> 
> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra (gdawra.ietf@gmail.com 
> <mailto:gdawra.ietf@gmail.com>) wrote:
> 
>> Hi Martin,
>>
>> Thanks for review. I will post the new version. Hopefully, it will 
>> address all your comments and we can close this review.
>>
>> Any updates on below response?
>>
>> Cheers,
>>
>> Gaurav
>>
>> Sent from my iPhone
>>
>> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com 
>> <mailto:gdawra.ietf@gmail.com>> wrote:
>>
>>> Hi Martin,
>>>
>>> Thanks for the review. Any further comments here ? I will post the 
>>> new version soon.
>>>
>>> Cheers,
>>>
>>> Gaurav
>>>
>>> Sent from my iPhone
>>>
>>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com 
>>> <mailto:gdawra.ietf@gmail.com>> wrote:
>>>
>>>> Hi Martin,
>>>>
>>>> Apologies from my end we had few internal authors conversations on 
>>>> the points you have raised.
>>>>
>>>> Please find below my response. I will be happy to discuss further, 
>>>> if needed.
>>>>
>>>> <Gaurav> inline...
>>>>
>>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com 
>>>>> <mailto:mls.ietf@gmail.com>> wrote:
>>>>>
>>>>> Hi Gaurav,
>>>>>
>>>>> This got lost on my end, sorry for this. The filter just moved 
>>>>> these messages out of my sight... :-/
>>>>>
>>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
>>>>>> Hey Martin,
>>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
>>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling 
>>>>>>> <mls.ietf@gmail.com <mailto:mls.ietf@gmail.com> 
>>>>>>> <mailto:mls.ietf@gmail.com>> wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've reviewed this document as part of the transport area review 
>>>>>>> team's ongoing effort to review key IETF documents. These 
>>>>>>> comments were written primarily for the transport area directors, 
>>>>>>> but are copied to the document's authors for their information 
>>>>>>> and to allow them to address any issues raised. When done at the 
>>>>>>> time of IETF Last Call, the authors should consider this review 
>>>>>>> together with any other last-call comments they receive. Please 
>>>>>>> always CC tsv-art@â€¦ if you reply to or forward this review.
>>>>>>>
>>>>>>> Summary:
>>>>>>> This draft has serious issues in Section 7.1, 7.2 and in one part 
>>>>>>> of Section3, described in the review, and needs to be rethought. 
>>>>>>> The other sections are good AFAIK.
>>>>>>>
>>>>>>>
>>>>>>> Technicals:
>>>>>>> The overall draft looks ok, but the three points below look 
>>>>>>> strange and need a fix before publication IMHO:
>>>>>>>
>>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well 
>>>>>>> proven funcationality and not even safe to use functionality. 
>>>>>>> Both are some sort discussing that different paths in the network 
>>>>>>> could be used by the end host traffic. This sounds pretty much 
>>>>>>> like the Path Aware Networking Proposed Research Group 
>>>>>>> (https://irtf.org/panrg) and hints to the fact that there is no 
>>>>>>> commonly understand and accepted engineering solution in this space.
>>>>>>>
>>>>>>> Section 7.1:
>>>>>>> [KANDULA04] is a really old reference that hasn't been followed 
>>>>>>> up in recent times and even worse there is no evidence that this 
>>>>>>> is going to work good enough or stable enough under real Internet 
>>>>>>> traffic. Additionally, it is more than unclear how any modern TCP 
>>>>>>> implementation will react to this
>>>>>> [Gaurav] Will get back on this.
>>>>>
>>>>> I will reply to the other email dicussing this.
>>>> <Gaurav> I have replied to other thread.
>>>>>
>>>>>>>
>>>>>>> Section 7.2:
>>>>>>> This section describes an idea without detailing too much about 
>>>>>>> any further aspects. Further it changes the commonly accepted 
>>>>>>> notion of what an end host can do with the network. At best this 
>>>>>>> would require a good definition of what an end host in your 
>>>>>>> setting is, e.g., a highly modified piece of (at least) software 
>>>>>>> that usually not found in OS availble on the market (yet?)
>>>>>>> Further communicating instantaneous path characteristics to a 
>>>>>>> central point is potentially a bad idea, as the data is already 
>>>>>>> outdated when reported by any node.
>>>>>> [Gaurav] I believe Authors are trying to highlight that Host which 
>>>>>> is defined in 
>>>>>> (https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15) 
>>>>>> can influence the traffic based on the Calculations locally or 
>>>>>> jointly with the controller. Implementations can decide how much 
>>>>>> Centralized -vs- localized control is allowed at Host based on 
>>>>>> performance data collection.
>>>>>
>>>>> Performance data collection (monitoring?) isn't crucial when it 
>>>>> comes to timely (actually real-time) reaction. However, this 
>>>>> section isn't just about performance data collection as it is about 
>>>>> "Performance-aware routing" this seems to try to interact in 
>>>>> real-time with the network behavior of TCP. This isn't even close 
>>>>> to acceptable.
>>>>>
>>>>> I would be ok to say that it is useful to collect performance data 
>>>>> for offline analysis and improvement of the data network. However, 
>>>>> this is at completely different magnitues of time scales.
>>>>>
>>>>> I would recommend to remove the TCP part from this section entirely.
>>>> <Gaurav>Ack, will update in next rev:
>>>>
>>>> Section will read like this:
>>>>
>>>> ;
>>>> /Knowing the path associated with flows/packets, the end host may/
>>>> /deduce certain characteristics of the path on its own, and/
>>>> /additionally use the information supplied with path information/
>>>> /pushed from the controller or received via pull request. The host/
>>>> /may further share its path observations with the centralized agent,/
>>>> /so that the latter may keep up-to-date network health map to assist/
>>>> /other hosts with this information./
>>>> //
>>>> /For example, an application A.1 at HostA may pin a flow destined/
>>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/
>>>> /application A.1 may collect information on packet loss, deduced from/
>>>> /Other offline mechanisms. [There are some pingMesh mechanisms which /
>>>> /Can be used here]/
>>>> /Through these mechanisms information to a centralized agent, e.g./
>>>> /after a flow completes, or periodically for longer lived flows./
>>>> /Next, using both local and/or global performance data, application/
>>>> /A.1 as well as other applications sharing the same resources in the/
>>>> /DC fabric may pick up the best path for the new flow, or update an/
>>>> /existing path (e.g.: when informed of congestion on an existing/
>>>> /path)./
>>>> ;
>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>> Section 3, 3rd bullet point:
>>>>>>> It is the foundation of TCP that the network is regarded as a 
>>>>>>> black box and that you infer from the transmission of packets 
>>>>>>> what the current state of the network path is. Inferring network 
>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as 
>>>>>>> this would required that all paths exhibit this and if not what 
>>>>>>> is going to happen?
>>>>>>> It could be an interesting research field to change many points 
>>>>>>> in TCP's behavior, but this once again points to the fact that 
>>>>>>> this not the IETF works but IRTF or elsewhere.
>>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly 
>>>>>> treating Network as Black Box. Authors are implying per path 
>>>>>> performance metrics as not cached. Is there some change in text 
>>>>>> you are suggesting?
>>>>>
>>>>>
>>>>> I would recommend to remove the 3rd bullet point completey. TCP 
>>>>> isn't the place to remember "good" or "bad" paths. This is 
>>>>> something the network could decide, e.g., rerouting TCP flows 
>>>>> within the network or changing the forwarding path in the network 
>>>>> for particular flows (if it is not routed).
>>>>
>>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd 
>>>> bullet point.Â Will update in next rev - coming shortly.
>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>> Â Martin
>>>>>
>>>>


From nobody Wed Jun  6 13:20:14 2018
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From: "Voyer, Daniel" <daniel.voyer@bell.ca>
To: "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Wed, 6 Jun 2018 20:20:01 +0000
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Working Group,

We are currently preparing draft draft-xu-mpls-sr-over-ip for working
group adoption.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?

If so, has this IPR been disclosed in compliance with IETF IPR rules
(see RFCs 3979, 4879, 3669 and 5378 for more details).

There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.

If you are listed as a document author or contributor please respond to
this email regardless of whether or not you are aware of any relevant
IPR. *The response needs to be sent to the MPLS WG mailing list.* The
document will not advance to the next stage until a response has been
received from each author and contributor.

If you are on the MPLS WG email list but are not listed as an author or
contributor, then please explicitly respond only if you are aware of any
IPR that has not yet been disclosed in conformance with IETF rules.

We have copied this mail to the SPRING wg mailing list for information.
If you receive this mail over the SPRING wg mailing list, and are aware
of IPRs that apply to the draft, please notify the MPLS wg list.


/Loa
  mpls wg co-chair
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Thu Jun  7 04:17:28 2018
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>
Cc: <draft-xu-mpls-sr-over-ip@ietf.org>, <mpls-chairs@ietf.org>, "'SPRING WG List'" <spring@ietf.org>, <mpls@ietf.org>
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Date: Thu, 7 Jun 2018 12:17:05 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/g49JFBG2vOhvflLvV3BFOcLqlZE>
Subject: Re: [spring] draft-xu-mpls-sr-over-ip
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Thanks Loa,

I don't know of any IPR directly relevant to this draft.

I note that this document has a heavy dependency on RFC 7510 and there is IPR
disclosed against that RFC.

Cheer,
Adrian

> ________________________________________
> From: Loa Andersson
> Sent: 07 June 2018 11:15:03 (UTC+00:00) Dublin, Edinburgh, Lisbon, London
> To: mpls@ietf.org
> Cc: draft-xu-mpls-sr-over-ip@ietf.org; mpls-chairs@ietf.org; spring@ietf.org
> Subject: draft-xu-mpls-sr-over-ip
> 
> Working Group,
> 
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
> 
> Part of this preparation is to do an IPR poll.
> 
> This mail is to start the IPR poll.
> 
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
> 
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> 
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
> 
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
> 
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
> 
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
> 
> 
> /Loa
>   mpls wg co-chair
> --
> 
> 
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: Jeff Tantsura <jefftant.ietf@gmail.com>
Date: Thu, 7 Jun 2018 07:19:11 -0700
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To: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>
Cc: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>,  "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,  "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Subject: Re: [spring] draft-xu-mpls-sr-over-ip
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Loa,

I=E2=80=99m not aware of any IPR that applies to this draft.

Thanks,
Jeff


On Thu, Jun 7, 2018 at 06:34 Henderickx, Wim (Nokia - BE/Antwerp) <
wim.henderickx@nokia.com> wrote:

> I am not aware of IPR related to this draft.
>
> =EF=BB=BFOn 07/06/2018, 03:15, "Loa Andersson" <loa@pi.nu> wrote:
>
>     Working Group,
>
>     We are currently preparing draft draft-xu-mpls-sr-over-ip for working
>     group adoption.
>
>     Part of this preparation is to do an IPR poll.
>
>     This mail is to start the IPR poll.
>
>     Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
>     If so, has this IPR been disclosed in compliance with IETF IPR rules
>     (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
>     There are currently no IPR disclosures against
> draft-xu-mpls-sr-over-ip.
>
>     If you are listed as a document author or contributor please respond =
to
>     this email regardless of whether or not you are aware of any relevant
>     IPR. *The response needs to be sent to the MPLS WG mailing list.* The
>     document will not advance to the next stage until a response has been
>     received from each author and contributor.
>
>     If you are on the MPLS WG email list but are not listed as an author =
or
>     contributor, then please explicitly respond only if you are aware of
> any
>     IPR that has not yet been disclosed in conformance with IETF rules.
>
>     We have copied this mail to the SPRING wg mailing list for informatio=
n.
>     If you receive this mail over the SPRING wg mailing list, and are awa=
re
>     of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
>     /Loa
>       mpls wg co-chair
>     --
>
>
>     Loa Andersson                        email: loa@pi.nu
>     Senior MPLS Expert
>     Bronze Dragon Consulting             phone: +46 739 81 21 64
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>

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Loa,<br><br>I=E2=80=99m not aware of any IPR that applies to  this draft.<b=
r><br>Thanks,<br>Jeff<br><br><br><div class=3D"gmail_quote"><div dir=3D"ltr=
">On Thu, Jun 7, 2018 at 06:34 Henderickx, Wim (Nokia - BE/Antwerp) &lt;<a =
href=3D"mailto:wim.henderickx@nokia.com">wim.henderickx@nokia.com</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">I am not aware of IPR related=
 to this draft.<br>
<br>
=EF=BB=BFOn 07/06/2018, 03:15, &quot;Loa Andersson&quot; &lt;<a href=3D"mai=
lto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Working Group,<br>
<br>
=C2=A0 =C2=A0 We are currently preparing draft draft-xu-mpls-sr-over-ip for=
 working<br>
=C2=A0 =C2=A0 group adoption.<br>
<br>
=C2=A0 =C2=A0 Part of this preparation is to do an IPR poll.<br>
<br>
=C2=A0 =C2=A0 This mail is to start the IPR poll.<br>
<br>
=C2=A0 =C2=A0 Are you aware of any IPR that applies to draft-xu-mpls-sr-ove=
r-ip?<br>
<br>
=C2=A0 =C2=A0 If so, has this IPR been disclosed in compliance with IETF IP=
R rules<br>
=C2=A0 =C2=A0 (see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
=C2=A0 =C2=A0 There are currently no IPR disclosures against draft-xu-mpls-=
sr-over-ip.<br>
<br>
=C2=A0 =C2=A0 If you are listed as a document author or contributor please =
respond to<br>
=C2=A0 =C2=A0 this email regardless of whether or not you are aware of any =
relevant<br>
=C2=A0 =C2=A0 IPR. *The response needs to be sent to the MPLS WG mailing li=
st.* The<br>
=C2=A0 =C2=A0 document will not advance to the next stage until a response =
has been<br>
=C2=A0 =C2=A0 received from each author and contributor.<br>
<br>
=C2=A0 =C2=A0 If you are on the MPLS WG email list but are not listed as an=
 author or<br>
=C2=A0 =C2=A0 contributor, then please explicitly respond only if you are a=
ware of any<br>
=C2=A0 =C2=A0 IPR that has not yet been disclosed in conformance with IETF =
rules.<br>
<br>
=C2=A0 =C2=A0 We have copied this mail to the SPRING wg mailing list for in=
formation.<br>
=C2=A0 =C2=A0 If you receive this mail over the SPRING wg mailing list, and=
 are aware<br>
=C2=A0 =C2=A0 of IPRs that apply to the draft, please notify the MPLS wg li=
st.<br>
<br>
<br>
=C2=A0 =C2=A0 /Loa<br>
=C2=A0 =C2=A0 =C2=A0 mpls wg co-chair<br>
=C2=A0 =C2=A0 -- <br>
<br>
<br>
=C2=A0 =C2=A0 Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" tar=
get=3D"_blank">loa@pi.nu</a><br>
=C2=A0 =C2=A0 Senior MPLS Expert<br>
=C2=A0 =C2=A0 Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0phone: +46 739 81 21 64<br>
<br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div>

--000000000000419f0f056e0df870--


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To: adrian@olddog.co.uk, 'Loa Andersson' <loa@pi.nu>
Cc: draft-xu-mpls-sr-over-ip@ietf.org, mpls-chairs@ietf.org, 'SPRING WG List' <spring@ietf.org>, mpls@ietf.org
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Thu, 7 Jun 2018 15:38:08 +0100
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Subject: Re: [spring] draft-xu-mpls-sr-over-ip
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I have nothing to add beyond what Adrian says.

I know of no other IPR.

Stewart

On 07/06/2018 12:17, Adrian Farrel wrote:
> Thanks Loa,
>
> I don't know of any IPR directly relevant to this draft.
>
> I note that this document has a heavy dependency on RFC 7510 and there is IPR
> disclosed against that RFC.
>
> Cheer,
> Adrian
>
>> ________________________________________
>> From: Loa Andersson
>> Sent: 07 June 2018 11:15:03 (UTC+00:00) Dublin, Edinburgh, Lisbon, London
>> To: mpls@ietf.org
>> Cc: draft-xu-mpls-sr-over-ip@ietf.org; mpls-chairs@ietf.org; spring@ietf.org
>> Subject: draft-xu-mpls-sr-over-ip
>>
>> Working Group,
>>
>> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
>> group adoption.
>>
>> Part of this preparation is to do an IPR poll.
>>
>> This mail is to start the IPR poll.
>>
>> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>>
>> If so, has this IPR been disclosed in compliance with IETF IPR rules
>> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>>
>> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>>
>> If you are listed as a document author or contributor please respond to
>> this email regardless of whether or not you are aware of any relevant
>> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
>> document will not advance to the next stage until a response has been
>> received from each author and contributor.
>>
>> If you are on the MPLS WG email list but are not listed as an author or
>> contributor, then please explicitly respond only if you are aware of any
>> IPR that has not yet been disclosed in conformance with IETF rules.
>>
>> We have copied this mail to the SPRING wg mailing list for information.
>> If you receive this mail over the SPRING wg mailing list, and are aware
>> of IPRs that apply to the draft, please notify the MPLS wg list.
>>
>>
>> /Loa
>>    mpls wg co-chair
>> --
>>
>>
>> Loa Andersson                        email: loa@pi.nu
>> Senior MPLS Expert
>> Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Voyer, Daniel" <daniel.voyer@bell.ca>, "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/PMkgYsHRpg53ACAbqULxqBAALwc>
Subject: Re: [spring] Updating the SPRING WG Charter
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "Voyer, Daniel" <daniel.voyer@bell.ca>, "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>,  Michael McBride <Michael.McBride@huawei.com>, Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
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Subject: Re: [spring] Updating the SPRING WG Charter
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Hi Sasha,

I think there is technology to allow that.

Imagine a segment with embedded meaning that packets received with such
value X should be replicated to interfaces  Y & Z. Such decision can be
configured from controller or locally computed.

Nothing there is per-path as well as nothing there is per flow or per
multicast group. It is a local function.

Some folks call it SR-spray, I call it SR-fanout - but it does seems very
useful so I support keeping it in the proposed charter.

Many thx,
Robert,




On Thu, Jun 7, 2018 at 4:47 PM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Hi all,
>
> I do not think that SPRING WG should deal with MC =E2=80=93 possibly, exc=
luding
> use of ingress replication for multicast.
>
>
>
> This is based on what I see as the key element (highlighted) in
> definition of SPRING activities in the proposed charter:
>
>
>
> The SPRING WG defines procedures that allow a node to steer a packet
> through an
>
> SR Policy instantiated as an ordered list of instructions called segments
> and
>
> without the need for per-path state information to be held at transit nod=
es
> .
>
>
>
> To the best of my understanding, the only way for SR to provide this
> functionality forf multicast (be it SR-MPLS or SRV6) is ingress replicati=
on
> using unicast SR paths. In particular, the framework defined in
> draft-allan
> <https://tools.ietf.org/html/draft-allan-spring-mpls-multicast-framework-=
03>
> explicitly requires per-path state in the replication points.
>
>
>
> From my POV the only technology that allows MC traffic to traverse the
> transit nodes without per-path state in the transit nodes and without
> multiple copies of the packet crossing the same link is BIER.
>
>
>
> My 2c,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> *From:* spring [mailto:spring-bounces@ietf.org] *On Behalf Of *Voyer,
> Daniel
> *Sent:* Wednesday, June 6, 2018 11:20 PM
> *To:* Zafar Ali (zali) <zali@cisco.com>; Rob Shakir <robjs=3D
> 40google.com@dmarc.ietf.org>; Michael McBride <Michael.McBride@huawei.com=
>
> *Cc:* Xiejingrong <xiejingrong@huawei.com>; spring@ietf.org
>
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi all,
>
>
>
> I support and agree w/ Zafar.
>
>
>
> Multicast in SR is much needed and there is lots of development that need=
s
> to happen, whether for SRv6 or with SR-MPLS. The core architecture and
> development need to be included in this working group.
>
>
>
> Thanks,
>
> dan
>
>
>
>
>
> *From: *"Zafar Ali (zali)" <zali@cisco.com>
> *Date: *Wednesday, June 6, 2018 at 3:14 PM
> *To: *Rob Shakir <robjs=3D40google.com@dmarc.ietf.org>, Michael McBride <
> Michael.McBride@huawei.com>
> *Cc: *Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <
> spring@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
> *Subject: *Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Rob,
>
>
>
> The multicast in SR belongs to the same category as I highlighted in my
> last email. Just to repeat =E2=80=A6
>
>
>
> At IETF101, you and Bruno presented a slide based on the WG feedback on
> the mailing list (https://datatracker.ietf.org/
> meeting/101/materials/slides-101-spring-00-chairs-slides-01). During the
> Spring meeting, the WG agreed to add milestones to those items. In genera=
l,
> I see some milestones are not included in the proposed chartered text.
>
>
>
> Specifically, multicast in SR is included in that list with the "Ingress
> replication SID (Tree SID /spray)" bullet (and support during the WG
> meeting) but is missing in the proposed charter text. So, I agree with
> Xiejingrong and Michael highlighting the same. There is already interest
> and agreement shown by the WG to include multicast in SR in the charter.
>
>
>
> In the light of the above, please add a milestone for the WG to specify
> architecture, and the required protocol extensions for multicast in SR wi=
th
> MPLS and IPv6 data planes, including specification of the ingress
> replication SIDs (e.g., Tree SID, Spray). Nonetheless, I wholeheartedly
> agree that the actual protocol extension work should be done at the WG th=
at
> owns the protocol.
>
>
>
> Thanks
>
>
>
> Regards =E2=80=A6 Zafar
>
>
>
> *From: *spring <spring-bounces@ietf.org> on behalf of Rob Shakir <
> robjs=3D40google.com@dmarc.ietf.org>
> *Date: *Monday, June 4, 2018 at 12:45 PM
> *To: *Michael McBride <Michael.McBride@huawei.com>
> *Cc: *Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <
> spring@ietf.org>
> *Subject: *Re: [spring] Updating the SPRING WG Charter
>
>
>
> Michael,
>
>
>
> Thanks for the comment.
>
> On Mon, Jun 4, 2018 at 9:42 AM Michael McBride <Michael.McBride@huawei.co=
m>
> wrote:
>
> It would be helpful, while updating the charter, to state whether
> multicast in SR is in/out of scope in order to know which wg to take our
> future work.
>
>
>
> I think this is impractical. If we state everything that is in or out of
> scope, we'll end up with a laundry list. The aim of the charter is to
> define clearly the work that the WG should focus on. It does not mean tha=
t
> we can never host discussion of individual drafts if they are relevant. I=
f
> there are requirements, we can always recharter if something new becomes
> the highest priority for the industry w.r.t SR.
>
>
>
> Kind regards,
>
> r.
>
> ____________________________________________________________
> _______________
>
> This e-mail message is intended for the recipient only and contains
> information which is
> CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have
> received this
> transmission in error, please inform us by e-mail, phone or fax, and then
> delete the original
> and all copies thereof.
> ____________________________________________________________
> _______________
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>

--000000000000c91eb7056e0e7785
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Sasha,</div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br><=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small">I think there is technology to allow that.=C2=A0</d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small">Imagine a segment with e=
mbedded meaning that packets received with such value X should be replicate=
d to interfaces=C2=A0 Y &amp; Z. Such decision can be configured from contr=
oller or locally computed.=C2=A0</div><div class=3D"gmail_default" style=3D=
"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-s=
ize:small">Nothing there is per-path as well as nothing there is per flow o=
r per multicast group. It is a local function.=C2=A0</div><div class=3D"gma=
il_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small=
"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small">Some folks call it SR-spray, I call it SR-fa=
nout - but it does seems very useful so I support keeping it in the propose=
d charter.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:ari=
al,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Many =
thx,</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small">Robert,</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div=
 class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fo=
nt-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:=
arial,helvetica,sans-serif;font-size:small"><br></div></div><div class=3D"g=
mail_extra"><br><div class=3D"gmail_quote">On Thu, Jun 7, 2018 at 4:47 PM, =
Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ecitele.com</a>&=
gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_1393975092308777562WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Hi all,<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">I do not think that SP=
RING WG should deal with MC =E2=80=93 possibly, excluding use of ingress re=
plication for multicast.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">This is based on what =
I see as the key element (<span style=3D"background:yellow">highlighted</sp=
an>) in definition of SPRING activities in the proposed charter:<u></u><u><=
/u></span></p><span class=3D"">
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
The SPRING WG defines procedures that allow a node to steer a packet throug=
h an</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
SR Policy instantiated as an ordered list of instructions called segments a=
nd</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;b=
ackground:yellow">without the need for per-path state information to be hel=
d at transit nodes</span><span style=3D"font-family:&quot;Courier New&quot;=
">.</span><span style=3D"color:#1f497d"><u></u><u></u></span></p>
</span><div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">To the best of my unde=
rstanding, the only way for SR to provide this functionality forf multicast=
 (be it SR-MPLS or SRV6) is ingress replication using unicast SR paths. In =
particular, the framework defined in
<a href=3D"https://tools.ietf.org/html/draft-allan-spring-mpls-multicast-fr=
amework-03" target=3D"_blank">
draft-allan</a> explicitly requires per-path state in the replication point=
s.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">From my POV the only t=
echnology that allows MC traffic to traverse the transit nodes without per-=
path state in the transit nodes and without multiple copies of the packet c=
rossing the same link is BIER.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">My 2c, <u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Sasha<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Office: +972-39266302<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Cell:=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 +972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">Email:=C2=A0=C2=A0 <a =
href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexande=
r.Vainshtein@ecitele.<wbr>com</a><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> spring [mailto:<a href=3D"mailto:spring=
-bounces@ietf.org" target=3D"_blank">spring-bounces@ietf.<wbr>org</a>] <b>O=
n Behalf Of
</b>Voyer, Daniel<br>
<b>Sent:</b> Wednesday, June 6, 2018 11:20 PM<br>
<b>To:</b> Zafar Ali (zali) &lt;<a href=3D"mailto:zali@cisco.com" target=3D=
"_blank">zali@cisco.com</a>&gt;; Rob Shakir &lt;robjs=3D<a href=3D"mailto:4=
0google.com@dmarc.ietf.org" target=3D"_blank">40google.com@dmarc.<wbr>ietf.=
org</a>&gt;; Michael McBride &lt;<a href=3D"mailto:Michael.McBride@huawei.c=
om" target=3D"_blank">Michael.McBride@huawei.com</a>&gt;<br>
<b>Cc:</b> Xiejingrong &lt;<a href=3D"mailto:xiejingrong@huawei.com" target=
=3D"_blank">xiejingrong@huawei.com</a>&gt;; <a href=3D"mailto:spring@ietf.o=
rg" target=3D"_blank">spring@ietf.org</a></p><div><div class=3D"h5"><br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter<u></u><u></u></=
div></div><p></p>
</div>
</div><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Hi all,<span lang=3D"EN-CA"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">I support and agree w/ Zafar.<span lang=3D"EN-CA"><u=
></u><u></u></span></p>
<p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">Multicast in SR is much needed and there is lots of =
development that needs to happen, whether for SRv6 or with SR-MPLS. The cor=
e architecture and development need to be included in this working group.
<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">Thanks,<span lang=3D"EN-CA"><u></u><u></u></span></p=
>
<p class=3D"MsoNormal">dan<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p>
<p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-CA" style=3D"font-size:12.0pt;co=
lor:black">From:
</span></b><span lang=3D"EN-CA" style=3D"font-size:12.0pt;color:black">&quo=
t;Zafar Ali (zali)&quot; &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_b=
lank">zali@cisco.com</a>&gt;<br>
<b>Date: </b>Wednesday, June 6, 2018 at 3:14 PM<br>
<b>To: </b>Rob Shakir &lt;<a href=3D"mailto:robjs=3D40google.com@dmarc.ietf=
.org" target=3D"_blank">robjs=3D40google.com@dmarc.<wbr>ietf.org</a>&gt;, M=
ichael McBride &lt;<a href=3D"mailto:Michael.McBride@huawei.com" target=3D"=
_blank">Michael.McBride@huawei.com</a>&gt;<br>
<b>Cc: </b>Xiejingrong &lt;<a href=3D"mailto:xiejingrong@huawei.com" target=
=3D"_blank">xiejingrong@huawei.com</a>&gt;, &quot;<a href=3D"mailto:spring@=
ietf.org" target=3D"_blank">spring@ietf.org</a>&quot; &lt;<a href=3D"mailto=
:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;, &quot;Zafar Al=
i (zali)&quot; &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali=
@cisco.com</a>&gt;<br>
<b>Subject: </b>Re: [spring] Updating the SPRING WG Charter</span><span lan=
g=3D"EN-CA"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi Rob, <u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">The multicast in SR belongs to =
the same category as I highlighted in my last email. Just to repeat =E2=80=
=A6
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">At IETF101, you and Bruno prese=
nted a slide based on the WG feedback on the mailing list (<a href=3D"https=
://datatracker.ietf.org/meeting/101/materials/slides-101-spring-00-chairs-s=
lides-01" target=3D"_blank">https://datatracker.ietf.org/<wbr>meeting/101/m=
aterials/slides-<wbr>101-spring-00-chairs-slides-01</a><wbr>).
 During the Spring meeting, the WG agreed to add milestones to those items.=
 In general, I see some milestones are not included in the proposed charter=
ed text.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Specifically, multicast in SR i=
s included in that list with the &quot;Ingress replication SID (Tree SID /s=
pray)&quot; bullet (and support during the WG meeting) but is missing in th=
e proposed charter text. So, I agree with Xiejingrong
 and Michael highlighting the same. There is already interest and agreement=
 shown by the WG to include multicast in SR in the charter.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">In the light of the above, plea=
se add a milestone for the WG to specify architecture, and the required pro=
tocol extensions for multicast in SR with MPLS and IPv6 data planes, includ=
ing specification of the ingress replication
 SIDs (e.g., Tree SID, Spray). Nonetheless, I wholeheartedly agree that the=
 actual protocol extension work should be done at the WG that owns the prot=
ocol.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif">Thanks</span><span lang=3D"EN-CA"=
><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif">=C2=A0</span><span lang=3D"EN-CA"=
><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif">Regards =E2=80=A6 Zafar
</span><span lang=3D"EN-CA"><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-CA" style=3D"font-size:12.0pt;co=
lor:black">From:
</span></b><span lang=3D"EN-CA" style=3D"font-size:12.0pt;color:black">spri=
ng &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blank">spring-=
bounces@ietf.org</a>&gt; on behalf of Rob Shakir &lt;<a href=3D"mailto:robj=
s=3D40google.com@dmarc.ietf.org" target=3D"_blank">robjs=3D40google.com@dma=
rc.<wbr>ietf.org</a>&gt;<br>
<b>Date: </b>Monday, June 4, 2018 at 12:45 PM<br>
<b>To: </b>Michael McBride &lt;<a href=3D"mailto:Michael.McBride@huawei.com=
" target=3D"_blank">Michael.McBride@huawei.com</a>&gt;<br>
<b>Cc: </b>Xiejingrong &lt;<a href=3D"mailto:xiejingrong@huawei.com" target=
=3D"_blank">xiejingrong@huawei.com</a>&gt;, &quot;<a href=3D"mailto:spring@=
ietf.org" target=3D"_blank">spring@ietf.org</a>&quot; &lt;<a href=3D"mailto=
:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [spring] Updating the SPRING WG Charter</span><span lan=
g=3D"EN-CA"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Michael, <u></u><u></u></span><=
/p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span lang=3D"EN-CA">=
Thanks for the comment.<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">On Mon, Jun 4, 2018 at 9:42 AM =
Michael McBride &lt;<a href=3D"mailto:Michael.McBride@huawei.com" target=3D=
"_blank">Michael.McBride@huawei.com</a>&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"color:#1f497d">It woul=
d be helpful, while updating the charter, to state whether multicast in SR =
is in/out of scope in order to know which wg to take our
 future work.</span><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">I think this is impractical. If=
 we state everything that is in or out of scope, we&#39;ll end up with a la=
undry list. The aim of the charter is to define clearly the work that the W=
G should focus on. It does not mean that
 we can never host discussion of individual drafts if they are relevant. If=
 there are requirements, we can always recharter if something new becomes t=
he highest priority for the industry w.r.t SR.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Kind regards,<u></u><u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">r.<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div></div></div>
<br clear=3D"both">
______________________________<wbr>______________________________<wbr>_____=
__________<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is <br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original <br>
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<br>______________________________<wbr>_________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/spring</a><br=
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<br></blockquote></div><br></div>

--000000000000c91eb7056e0e7785--


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From: James Bensley <jwbensley@gmail.com>
Date: Thu, 7 Jun 2018 15:51:34 +0100
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To: Megan Ferguson <mferguson@amsl.com>
Cc: Rob Shakir <robjs@google.com>, RFC System <rfc-editor@rfc-editor.org>,  "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, stefano@previdi.net,  "bruno.decraene@orange.com> <bruno.decraene@orange.com" <bruno.decraene@orange.com>, "BRUNGARD, DEBORAH A" <db3546@att.com>,  Alvaro Retana <aretana.ietf@gmail.com>, Martin Vigoureux <martin.vigoureux@nokia.com>, spring@ietf.org
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Subject: Re: [spring] [Editorial Errata Reported] RFC8355 (5380)
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Hi Megan, Rob,

Thank you both for your responses. This does indeed seem valid English
syntax however, it doesn't seem to be used much in common parlance.

Apologies for the noise.

Also, last sentence of RFC7855 on page 3:

   Hence, the policy is instantiated in the packet header and does not
   requires any policy state in midpoints and tail-ends.

"require" ?

Kind regards,
James.


On 6 June 2018 at 17:39, Megan Ferguson <mferguson@amsl.com> wrote:
> Hi Rob and James,
>
> Regarding =E2=80=9Cconsist in=E2=80=9D:
>
> While this construction appears in past RFCs and is not incorrect, we fin=
d a number of readers are not
> familiar with it and think that an error exists.  We would not update tex=
t that uses it appropriately;
> however, the familiarity issue may be something to keep in mind for futur=
e writing.
>
> Please let us know if we can be of further assistance.
>
> RFC Editor/mf
>
>
>
> On Jun 6, 2018, at 1:00 AM, Rob Shakir <robjs@google.com> wrote:
>
>> Hi James,
>>
>> Thanks for reporting this.
>>
>> I think that "consists in" is actually what is meant here. The Cambridge=
 dictionary definition is a useful reference.
>>
>> IMHO, the intention of this sentence is to say that the important/necess=
ary characteristic of the alternate strategy is that it provides protection=
 along the shortest path. This might not be the most common English, but it=
 does seem to be correct.
>>
>> The RFC Editor folks are likely to be the experts here -- I'd welcome th=
eir comment too.
>>
>> Thanks,
>> r.
>>
>> On Wed, Jun 6, 2018 at 12:53 AM James Bensley <jwbensley@gmail.com> wrot=
e:
>> On 6 June 2018 at 08:21, RFC Errata System <rfc-editor@rfc-editor.org> w=
rote:
>> > Original Text
>> > -------------
>> > An alternative protection strategy consists in
>>
>> Alternatively, "consists of", is "in" the wrong preposition here?
>>
>> Kind regards,
>> James.
>


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To: Robert Raszuk <robert@raszuk.net>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <Michael.McBride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>, "Voyer, Daniel" <daniel.voyer@bell.ca>
References: <8CCB28152EA2E14A96BBEDC15823481A1CB79F12@sjceml521-mbs.china.huawei.com> <16253F7987E4F346823E305D08F9115A99A7D4CE@nkgeml514-mbx.china.huawei.com> <CAHd-QWvx-tkP1Asx3PwM3p2=wjuJm7b=A4Hb-BUnCMRzwT1J8w@mail.gmail.com> <8CCB28152EA2E14A96BBEDC15823481A1CB7FBFE@sjceml521-mbs.china.huawei.com> <CAHd-QWu+184A3Nje_Bmki9A3wwpp=4YyyKTTkWBtLcf_gt7Lvg@mail.gmail.com> <75252B5F-6BCB-4166-ACC1-C9E9697B7B68@cisco.com> <CA802BB9-00E2-4DA4-B7F2-B0ECB5DBD8FD@bell.ca> <DB5PR0301MB1909A63446648764B90DA47D9D640@DB5PR0301MB1909.eurprd03.prod.outlook.com> <CA+b+ERnV1f9LoPUn0N7f5yHS4BWmHRKfdyF62tin2eSXOpx_yw@mail.gmail.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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On 6/7/2018 10:55 AM, Robert Raszuk wrote:
> Imagine a segment with embedded meaning that packets received with 
> such value X should be replicated to interfacesÂ  Y & Z. Such decision 
> can be configured from controller or locally computed.
>
> Nothing there is per-path as well as nothing there is per flow or per 
> multicast group. It is a local function.

How can you say "nothing there per-path"?Â  The label X represents a 
multicast tree, and thus constitutes per-path state.Â Â Â  If some packets 
need to go to Y and Z, some need to go to Y, Z, and W, some need to go 
to Y, U, and V, etc., you obviously need a different label for each 
different multicast tree, and appropriate per-tree state.

Using a controller to set up multicast paths may be a good idea in some 
scenarios, but let's not pretend it doesn't create per-path state in the 
router.Â  Per-path (per-tree) is not the same as per-flow or per-group, 
of course, but that's true of any technique that aggregates flows into 
multicast tunnels.

Note also that if the label X is domain-wide unique and there is no RPF 
check, there is the possibility of nasty multicast loops.Â  These is some 
discussion of this in draft-zzhang-bess-bgp-multicast-controller-00.




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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    On 6/7/2018 10:55 AM, Robert Raszuk wrote:<br>
    <blockquote type="cite"
cite="mid:CA+b+ERnV1f9LoPUn0N7f5yHS4BWmHRKfdyF62tin2eSXOpx_yw@mail.gmail.com">
      <div class="gmail_default"
        style="font-family:arial,helvetica,sans-serif;font-size:small">Imagine
        a segment with embedded meaning that packets received with such
        value X should be replicated to interfacesÂ  Y &amp; Z. Such
        decision can be configured from controller or locally computed.Â </div>
      <div class="gmail_default"
        style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
      </div>
      <div class="gmail_default"
        style="font-family:arial,helvetica,sans-serif;font-size:small">Nothing
        there is per-path as well as nothing there is per flow or per
        multicast group. It is a local function.Â </div>
    </blockquote>
    <br>
    How can you say "nothing there per-path"?Â  The label X represents a
    multicast tree, and thus constitutes per-path state.Â Â Â  If some
    packets need to go to Y and Z, some need to go to Y, Z, and W, some
    need to go to Y, U, and V, etc., you obviously need a different
    label for each different multicast tree, and appropriate per-tree
    state.Â  <br>
    <br>
    Using a controller to set up multicast paths may be a good idea in
    some scenarios, but let's not pretend it doesn't create per-path
    state in the router.Â  Per-path (per-tree) is not the same as
    per-flow or per-group, of course, but that's true of any technique
    that aggregates flows into multicast tunnels.<br>
    <br>
    Note also that if the label X is domain-wide unique and there is no
    RPF check, there is the possibility of nasty multicast loops.Â  These
    is some discussion of this in
    draft-zzhang-bess-bgp-multicast-controller-00.<br>
    <br>
    <br>
    <br>
  </body>
</html>

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From: Alvaro Retana <aretana.ietf@gmail.com>
In-Reply-To: <d0d88a49-9cd8-fad4-9a8f-af45f1a8da2c@gmail.com>
References: <a77a198c-2a5a-d754-8725-6d6685338f6c@gmail.com> <40ED2C86-3403-4D89-8CA8-FBB9651BF2AB@gmail.com> <6dd41180-83bd-c02e-1783-df873e749941@gmail.com> <ACD3CA27-2B92-4BD9-9D2B-A22FE20A65E7@gmail.com> <EC4C550B-05D7-4E6D-A1FD-ED48ECDC3059@gmail.com> <465981C7-7AB1-43AF-8A80-69D835871077@gmail.com> <CAMMESszPMdjpFLjY7aMVaaPbP0GVVZgB_n6hu4gQt6fSbGOi8A@mail.gmail.com> <d0d88a49-9cd8-fad4-9a8f-af45f1a8da2c@gmail.com>
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To: Martin Stiemerling <mls.ietf@gmail.com>
Cc: Gaurav Dawra <gdawra.ietf@gmail.com>, tsv-art@ietf.org, spring@ietf.org,  =?UTF-8?Q?Mirja_K=C3=BChlewind?= <ietf@kuehlewind.net>
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Subject: Re: [spring] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08
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Thanks Martin!

On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com)
wrote:

Hi Alvaro, all,

Thanks for addressing my concerns.

This version is good to go from my side.

Kind regards,

;Martin

Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> Martin:
> br/>> Hi!!  How are you?
> br/>> Gaurav just posted a revision.  Please takke a look and let us know
if br/>> the changes address your concerrns or not.
> br/>>
https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-segment-routing-msdc=
-09
> br/>> Thanks!!!
> br/>> Alvaro. <
> br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@gmail.co=
m
br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:
> br/>>> Hi Martin, <
>>
>> Thanks for review. I will post the new version. Hopefully, it will
br/>>> address all your comments and we can close thhis review.
>>
>> Any updates on below response?
>>
>> Cheers,
>>
>> Gaurav
>>
>> Sent from my iPhone
>>
>> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>>
<mailto:gdawra.ietf@@gmail.com>> wrote:
>>
>>> Hi Martin,
>>>
>>> Thanks for the review. Any further comments here ? I will post the
br/>>>> new version soon. <
>>>
>>> Cheers,
>>>
>>> Gaurav
>>>
>>> Sent from my iPhone
>>>
>>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com
br/>>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
>>>
>>>> Hi Martin,
>>>>
>>>> Apologies from my end we had few internal authors conversations on
br/>>>>> the points you have raised. <
>>>>
>>>> Please find below my response. I will be happy to discuss further,
br/>>>>> if needed. <
>>>>
>>>> <Gaurav> inline...
>>>>
>>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com
br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:
>>>>>
>>>>> Hi Gaurav,
>>>>>
>>>>> This got lost on my end, sorry for this. The filter just moved
br/>>>>>> these messages out of my sight... :-/
>>>>>
>>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
>>>>>> Hey Martin,
>>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
>>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>>
<mls.ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:
mls.ietf@gmail.com>> wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've reviewed this document as part of the transport area review
br/>>>>>>>> team's ongoing effort to review key IETF documents. These
br/>>>&gtt;>>>> comments were written primarily for the transport area
directors, br/>>>>>>>> but are copied to the doocument's authors for their
information br/>>>>>>>&> and to allow them to address any issues raised.
When done at the
>>>>>>> time of IETF Last Call, the authors should consider this review
br/>>>>>>>> together with any other last-call comments they receive. Please
br/>>>&>>>>> always CC tsv-art@=E2=80=A6 if you reply to or forward this re=
view.
>>>>>>>
>>>>>>> Summary:
>>>>>>> This draft has serious issues in Section 7.1, 7.2 and in one part
br/>>>>>>>> of Secction3, described in the review, and needs to be
rethought. br/>>&>>>>>> The other sections are good AFAIK.
>>>>>>>
>>>>>>>
>>>>>>> Technicals:
>>>>>>> The overall draft looks ok, but the three points below look
br/>>>>>>>> strange and need a fix before publication IMHO:
>>>>>>>
>>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well
br/>>>>>>>> proven funcationality and not even safe to use functionality.
br/>>>&>>>>> Both are some sort discussing that different paths in the
network br/>>>>>>>> could be used by the eend host traffic. This sounds
pretty much br/>>>>>>&gtt;> like the Path Aware Networking Proposed
Research Group br/>&gtt;>>>>>> (https://irtf.org/panrg) and hints to the
fact that there is no br/>>>>>>>> commonly understannd and accepted
engineering solution in this space.
>>>>>>>
>>>>>>> Section 7.1:
>>>>>>> [KANDULA04] is a really old reference that hasn't been followed
br/>>>>>>>> up iin recent times and even worse there is no evidence that
this br/>&gtt;>>>>>> is going to work good enough or stable enough under
real Internet br/>>>>>>>> traffic. Additioonally, it is more than unclear
how any modern TCP br/>>>>&ggt;>>> implementation will react to this
>>>>>> [Gaurav] Will get back on this.
>>>>>
>>>>> I will reply to the other email dicussing this.
>>>> <Gaurav> I have replied to other thread.
>>>>>
>>>>>>>
>>>>>>> Section 7.2:
>>>>>>> This section describes an idea without detailing too much about
br/>>>>>>>> any furtther aspects. Further it changes the commonly accepted
br/>>>;>>>>> notion of what an end host can do with the network. At best
this br/>>>>>>>> would require a good ddefinition of what an end host in
your br/>>>>>>>&ggt; setting is, e.g., a highly modified piece of (at
least) software
>>>>>>> that usually not found in OS availble on the market (yet?)
>>>>>>> Further communicating instantaneous path characteristics to a
br/>>>>>>>> central point is potentially a bad idea, as the data is already
br/>>>;>>>>> outdated when reported by any node.
>>>>>> [Gaurav] I believe Authors are trying to highlight that Host which
br/>>>>>>> is defineed in br/>>>>>>> (
https://tools.ietf.org/html/draftt-ietf-spring-segment-routing-15)
br/>>>>>>> can innfluence the traffic based on the Calculations locally or
br/>>&gtt;>>>> jointly with the controller. Implementations can decide how
much br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host
based on br/>>>>>>> perfoormance data collection.
>>>>>
>>>>> Performance data collection (monitoring?) isn't crucial when it
br/>>>>>> comes to timely (actuaally real-time) reaction. However, this
br/>>>>>> secttion isn't just about performance data collection as it is
about br/>>>>>>> "Performance-aware routing" this seems to try to interact
in br/>>>>>> real-time with the network behhavior of TCP. This isn't even
close br/>>>>>> to acceeptable.
>>>>>
>>>>> I would be ok to say that it is useful to collect performance data
br/>>>>>> for offline analysis and improvement of the data network.
However, br/>>>>>&ggt; this is at completely different magnitues of time
scales.
>>>>>
>>>>> I would recommend to remove the TCP part from this section entirely.
>>>> <Gaurav>Ack, will update in next rev:
>>>>
>>>> Section will read like this:
>>>>
>>>> ;
>>>> /Knowing the path associated with flows/packets, the end host may/
>>>> /deduce certain characteristics of the path on its own, and/
>>>> /additionally use the information supplied with path information/
>>>> /pushed from the controller or received via pull request. The host/
>>>> /may further share its path observations with the centralized agent,/
>>>> /so that the latter may keep up-to-date network health map to assist/
>>>> /other hosts with this information./
>>>> //
>>>> /For example, an application A.1 at HostA may pin a flow destined/
>>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/
>>>> /application A.1 may collect information on packet loss, deduced from/
>>>> /Other offline mechanisms. [There are some pingMesh mechanisms which /
>>>> /Can be used here]/
>>>> /Through these mechanisms information to a centralized agent, e.g./
>>>> /after a flow completes, or periodically for longer lived flows./
>>>> /Next, using both local and/or global performance data, application/
>>>> /A.1 as well as other applications sharing the same resources in the/
>>>> /DC fabric may pick up the best path for the new flow, or update an/
>>>> /existing path (e.g.: when informed of congestion on an existing/
>>>> /path)./
>>>> ;
>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>> Section 3, 3rd bullet point:
>>>>>>> It is the foundation of TCP that the network is regarded as a
br/>>>>>>>> black box and that you infer from the transmission of packets
br/>>>>;>>>> what the current state of the network path is. Inferring
network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad
idea, as br/>>>>>>>>; this would required that all paths exhibit this and
if not what br//>>>>>>>> is going to happen?
>>>>>>> It could be an interesting research field to change many points
br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact that
br/>>>&>>>>> this not the IETF works but IRTF or elsewhere.
>>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly
br/>>>>>>> treating Network as Black Box. Authors are implying per path
br/>>>>;>>> performance metrics as not cached. Is there some change in text
br/>>>>>>> you are suggesting??
>>>>>
>>>>>
>>>>> I would recommend to remove the 3rd bullet point completey. TCP
br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is
br/>>>>>> something the network could decide, e.g., rerouting TCP flows
br/>&ggt;>>>> within the network or changing the forwarding path in the
network br/>>>>>> for particular flows (if it is not routed).
>>>>
>>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd
br/>>>>> bullet point. Willl update in next rev - coming shortly.
>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>>  Martin
>>>>>
>>>>

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 <p style=3D"margin:0.0px 0.0px 0.0px 0.0px"><font face=3D"Helvetica" size=
=3D"4" style=3D"font:13.0px Helvetica">Thanks Martin!</font></p>
 <br><p class=3D"airmail_on">On June 6, 2018 at 3:14:45 PM, Martin Stiemerl=
ing (<a href=3D"mailto:mls.ietf@gmail.com">mls.ietf@gmail.com</a>) wrote:</=
p> <blockquote type=3D"cite" class=3D"clean_bq"><span><div><div></div><div>=
Hi Alvaro, all,

<br>

<br>Thanks for addressing my concerns.

<br>

<br>This version is good to go from my side.

<br>

<br>Kind regards,

<br>

<br>   ;Martin

<br>

<br>Am 30.05.18 um 21:55 schrieb Alvaro Retana:

<br>&gt; Martin:

<br>&gt; =20
br/&gt;&gt; Hi!!=C2=A0 How are you?

<br>&gt; =20
br/&gt;&gt; Gaurav just posted a revision.=C2=A0 Please takke a look and le=
t us know if =20
br/&gt;&gt; the changes address your concerrns or not.

<br>&gt; =20
br/&gt;&gt; <a href=3D"https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spri=
ng-segment-routing-msdc-09">https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf=
-spring-segment-routing-msdc-09</a>

<br>&gt; =20
br/&gt;&gt; Thanks!!!

<br>&gt; =20
br/&gt;&gt; Alvaro.
&lt;
<br>&gt; =20
br/&gt;&gt; On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((<a href=3D"mailt=
o:gdawra.ietf@gmail.com">gdawra.ietf@gmail.com</a> =20
br/&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@">gdawra.ietf@</a>@<a =
href=3D"http://gmail.com">gmail.com</a>&gt;) wrote:

<br>&gt; =20
br/&gt;&gt;&gt; Hi Martin,
&lt;
<br>&gt;&gt;

<br>&gt;&gt; Thanks for review. I will post the new version. Hopefully, it =
will =20
br/&gt;&gt;&gt; address all your comments and we can close thhis review.

<br>&gt;&gt;

<br>&gt;&gt; Any updates on below response?

<br>&gt;&gt;

<br>&gt;&gt; Cheers,

<br>&gt;&gt;

<br>&gt;&gt; Gaurav

<br>&gt;&gt;

<br>&gt;&gt; Sent from my iPhone

<br>&gt;&gt;

<br>&gt;&gt; On May 23, 2018, at 4:17 AM, Gaurav Dawra &lt;<a href=3D"mailt=
o:gdawra.ietf@gmail.com">gdawra.ietf@gmail.com</a> =20
br/&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@">gdawra.ietf@</a>=
@<a href=3D"http://gmail.com">gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;

<br>&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Thanks for the review. Any further comments here ? I will =
post the =20
br/&gt;&gt;&gt;&gt; new version soon.
&lt;
<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Cheers,

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Gaurav

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Sent from my iPhone

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; On May 16, 2018, at 7:44 PM, Gaurav Dawra &lt;<a href=3D"m=
ailto:gdawra.ietf@gmail.com">gdawra.ietf@gmail.com</a> =20
br/&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@">gdawra.ietf@=
</a>@<a href=3D"http://gmail.com">gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Apologies from my end we had few internal authors conv=
ersations on =20
br/&gt;&gt;&gt;&gt;&gt; the points you have raised.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Please find below my response. I will be happy to disc=
uss further, =20
br/&gt;&gt;&gt;&gt;&gt; if needed.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; inline...

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; On Apr 9, 2018, at 7:58 AM, Martin Stiemerling &lt=
;<a href=3D"mailto:mls.ietf@gmail.com">mls.ietf@gmail.com</a> =20
br/&gt;&gt;&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:mls.iietf@gmail.co=
m">mls.iietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Hi Gaurav,

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; This got lost on my end, sorry for this. The filte=
r just moved =20
br/&gt;&gt;&gt;&gt;&gt;&gt; these messages out of my  sight... :-/

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Am 15.02.18 um 05:47 schrieb Gaurav Dawra:

<br>&gt;&gt;&gt;&gt;&gt;&gt; Hey Martin,

<br>&gt;&gt;&gt;&gt;&gt;&gt; Sorry for late reply. Please see some comments=
 inline[Gaurav]

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; On Jan 9, 2018, at 2:25 PM, Martin Stiemer=
ling =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; &lt;mls.ietf@@<a href=3D"http://gmail.c=
om">gmail.com</a> &lt;mailto:<a href=3D"mailto:mls.ietf@gmail.com">mls.ietf=
@gmail.com</a>&gt; =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; &lt;mailto:<a href=3D"mailto:mls.ietf@=
gmail.com">mls.ietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Hi all,

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; I&#39;ve reviewed this document as part of=
 the transport area review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; team&#39;s  ongoing effort to review ke=
y IETF documents. These =20
br/&gt;&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; comments were written primarily fo=
r the transport area directors, =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; but are copied to the doocument&#39;s a=
uthors for their information =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;&gt; and to allow them to address any i=
ssues raised. When done at the =20
<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; time of IETF Last Call, the authors should=
 consider this review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; together  with any other last-call comm=
ents they receive. Please =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; always CC tsv-art@=E2=80=A6 if you=
 reply to or forward this review.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Summary:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This draft has serious issues in Section 7=
.1, 7.2 and in one part =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; of Secction3, described in the review, =
and needs to be rethought. =20
br/&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt;&gt; The other sections are good AFAIK.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Technicals:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; The overall draft looks ok, but the three =
points below look =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; strange and  need a fix before publicat=
ion IMHO:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Both Sections, 7.1. and 7.2., are describi=
ng ideas, but not well =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; proven  funcationality and not even saf=
e to use functionality. =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; Both are some sort discussing that=
 different paths in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; could be used by the eend host traffic.=
 This sounds pretty much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&amp;gtt;&gt; like the Path Aware Networking Pro=
posed Research Group =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://irtf.org/panrg=
">https://irtf.org/panrg</a>) and hints to the fact that there is no =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; commonly understannd and accepted engin=
eering solution in this space.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.1:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; [KANDULA04] is a really old reference that=
 hasn&#39;t been followed =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; up iin recent times and even worse ther=
e is no evidence that this =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; is going to work good enough or st=
able enough under real Internet =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; traffic. Additioonally, it is more than=
 unclear how any modern TCP =20
br/&gt;&gt;&gt;&gt;&amp;ggt;&gt;&gt;&gt; implementation will react to this

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Will get back on this.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I will reply to the other email dicussing this.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; I have replied to other thread.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.2:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This section describes an idea without det=
ailing too much about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; any furtther aspects. Further it change=
s the commonly accepted =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; notion of what an end host can do with=
 the network. At best this =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; would require a good ddefinition of wha=
t an end host in your =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;ggt; setting is, e.g., a highly modifie=
d piece of (at least) software =20
<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; that usually not found in OS availble on t=
he market (yet?)

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Further communicating instantaneous path c=
haracteristics to a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; central  point is potentially a bad ide=
a, as the data is already =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; outdated when reported by any node.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] I believe Authors are trying to highl=
ight that Host which =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; is defineed in =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://tools.ietf.org/html/dra=
ftt-ietf-spring-segment-routing-15">https://tools.ietf.org/html/draftt-ietf=
-spring-segment-routing-15</a>) =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; can innfluence the traffic based on the Cal=
culations locally or =20
br/&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; jointly with the controller. Implement=
ations can decide how much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; Centralized -vs- localized coontrol is allo=
wed at Host based on =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; perfoormance data collection.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Performance data collection (monitoring?) isn&#39;=
t crucial when it =20
br/&gt;&gt;&gt;&gt;&gt;&gt; comes to timely (actuaally real-time) reaction.=
 However, this =20
br/&gt;&gt;&gt;&gt;&gt;&gt; secttion isn&#39;t just about performance data =
collection as it is about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; &quot;Performance-aware routing&quot; this =
seems to try to interact in =20
br/&gt;&gt;&gt;&gt;&gt;&gt; real-time with the network behhavior of TCP. Th=
is isn&#39;t even close =20
br/&gt;&gt;&gt;&gt;&gt;&gt; to acceeptable.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would be ok to say that it is useful to collect =
performance data =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for offline analysis  and improvement of the da=
ta network. However, =20
br/&gt;&gt;&gt;&gt;&gt;&amp;ggt; this is at completely different magnitues =
of time scales.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the TCP part from this=
 section entirely.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt;Ack, will update in next rev:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Section will read like this:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt; /Knowing the path associated with flows/packets, the e=
nd host may/

<br>&gt;&gt;&gt;&gt; /deduce certain characteristics of the path on its own=
, and/

<br>&gt;&gt;&gt;&gt; /additionally use the information supplied with path i=
nformation/

<br>&gt;&gt;&gt;&gt; /pushed from the controller or received via pull reque=
st. The host/

<br>&gt;&gt;&gt;&gt; /may further share its path observations with the cent=
ralized agent,/

<br>&gt;&gt;&gt;&gt; /so that the latter may keep up-to-date network health=
 map to assist/

<br>&gt;&gt;&gt;&gt; /other hosts with this information./

<br>&gt;&gt;&gt;&gt; //

<br>&gt;&gt;&gt;&gt; /For example, an application A.1 at HostA may pin a fl=
ow destined/

<br>&gt;&gt;&gt;&gt; /to HostZ via Spine node Node5 using label stack {1600=
5, 16011}. The/

<br>&gt;&gt;&gt;&gt; /application A.1 may collect information on packet los=
s, deduced from/

<br>&gt;&gt;&gt;&gt; /Other offline mechanisms. [There are some pingMesh me=
chanisms which /

<br>&gt;&gt;&gt;&gt; /Can be used here]/

<br>&gt;&gt;&gt;&gt; /Through these mechanisms information to a centralized=
 agent, e.g./

<br>&gt;&gt;&gt;&gt; /after a flow completes, or periodically for longer li=
ved flows./

<br>&gt;&gt;&gt;&gt; /Next, using both local and/or global performance data=
, application/

<br>&gt;&gt;&gt;&gt; /A.1 as well as other applications sharing the same re=
sources in the/

<br>&gt;&gt;&gt;&gt; /DC fabric may pick up the best path for the new flow,=
 or update an/

<br>&gt;&gt;&gt;&gt; /existing path (e.g.: when informed of congestion on a=
n existing/

<br>&gt;&gt;&gt;&gt; /path)./

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 3, 3rd bullet point:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It is the foundation of TCP that the netwo=
rk is regarded as a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; black box  and that you infer from the =
transmission of packets =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt;&gt; what the current state of the network =
path is. Inferring network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; path metrics (you mention  SRTT, MSS, C=
WND ) is a bad idea, as =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; this would required that all paths exh=
ibit this and if not what =20
br//&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; is going to happen?

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It could be an interesting research field =
to change many points =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; in TCP&#39;ss behavior, but this once a=
gain points to the fact that =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; this not the IETF works but IRTF o=
r elsewhere.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Martin, Authors are trying to suggest=
 that TCP is rightly =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; treating  Network as Black Box. Authors are=
 implying per path =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt; performance metrics as not cached. Is ther=
e some change in text =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; you are suggesting??

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the 3rd bullet point c=
ompletey. TCP =20
br/&gt;&gt;&gt;&gt;&gt;&gt; isn&#39;t the place to rememmber &quot;good&quo=
t; or &quot;bad&quot; paths. This is =20
br/&gt;&gt;&gt;&gt;&gt;&gt;  something the network could decide, e.g., rero=
uting TCP flows =20
br/&gt;&amp;ggt;&gt;&gt;&gt;&gt; within the network or changing the forward=
ing path in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for particular flows (if it is  not routed).

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; Ack, after discussion, we will remove t=
he Section 3 - 3rd =20
br/&gt;&gt;&gt;&gt;&gt; bullet point.=C2=A0Willl update in next rev - comin=
g shortly.

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Kind regards,

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; =C2=A0Martin

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;

<br></div></div></span></blockquote>

--000000000000ed4c90056e0f68f1--


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--00000000000099b547056e0f6f54
Content-Type: text/plain; charset="UTF-8"

Hi Eric,

The way I look at this is really not from the perspective of true dynamic
multicast with tree building etc .. .I look at this as anchor points to
replicate unicast flows into two or more endpoints maybe once or twice in
entire domain.

So for sure if you would try to apply this technique to distribute
traditional multicast there is tons of things which can go wrong and you
are better off with BIER.

But there are applications which on one side do not really require full
multicast yet they would benefit with content to be send once from server
and arrived at two or more caches. Maybe we just don't have the right name
for it in networking yet :)

Cheers,
R.


On Thu, Jun 7, 2018 at 5:52 PM, Eric C Rosen <erosen@juniper.net> wrote:

> On 6/7/2018 10:55 AM, Robert Raszuk wrote:
>
> Imagine a segment with embedded meaning that packets received with such
> value X should be replicated to interfaces  Y & Z. Such decision can be
> configured from controller or locally computed.
>
> Nothing there is per-path as well as nothing there is per flow or per
> multicast group. It is a local function.
>
>
> How can you say "nothing there per-path"?  The label X represents a
> multicast tree, and thus constitutes per-path state.    If some packets
> need to go to Y and Z, some need to go to Y, Z, and W, some need to go to
> Y, U, and V, etc., you obviously need a different label for each different
> multicast tree, and appropriate per-tree state.
>
> Using a controller to set up multicast paths may be a good idea in some
> scenarios, but let's not pretend it doesn't create per-path state in the
> router.  Per-path (per-tree) is not the same as per-flow or per-group, of
> course, but that's true of any technique that aggregates flows into
> multicast tunnels.
>
> Note also that if the label X is domain-wide unique and there is no RPF
> check, there is the possibility of nasty multicast loops.  These is some
> discussion of this in draft-zzhang-bess-bgp-multicast-controller-00.
>
>
>
>

--00000000000099b547056e0f6f54
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Eric,</div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">The way I look at this is really not from the perspe=
ctive of true dynamic multicast with tree building etc .. .I look at this a=
s anchor points to replicate unicast flows into two or more endpoints maybe=
 once or twice in entire domain.=C2=A0</div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><d=
iv class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;=
font-size:small">So for sure if you would try to apply this technique to di=
stribute traditional multicast there is tons of things which can go wrong a=
nd you are better off with BIER.=C2=A0</div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><d=
iv class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;=
font-size:small">But there are applications which on one side do not really=
 require full multicast yet they would benefit with content to be send once=
 from server and arrived at two or more caches. Maybe we just don&#39;t hav=
e the right name for it in networking yet :)=C2=A0</div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
<br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small">Cheers,<br>R.</div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></di=
v></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, J=
un 7, 2018 at 5:52 PM, Eric C Rosen <span dir=3D"ltr">&lt;<a href=3D"mailto=
:erosen@juniper.net" target=3D"_blank">erosen@juniper.net</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF"><span class=3D"">
    On 6/7/2018 10:55 AM, Robert Raszuk wrote:<br>
    <blockquote type=3D"cite">
      <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;font-size:small">Imagine
        a segment with embedded meaning that packets received with such
        value X should be replicated to interfaces=C2=A0 Y &amp; Z. Such
        decision can be configured from controller or locally computed.=C2=
=A0</div>
      <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;font-size:small"><br>
      </div>
      <div class=3D"gmail_default" style=3D"font-family:arial,helvetica,san=
s-serif;font-size:small">Nothing
        there is per-path as well as nothing there is per flow or per
        multicast group. It is a local function.=C2=A0</div>
    </blockquote>
    <br></span>
    How can you say &quot;nothing there per-path&quot;?=C2=A0 The label X r=
epresents a
    multicast tree, and thus constitutes per-path state.=C2=A0=C2=A0=C2=A0 =
If some
    packets need to go to Y and Z, some need to go to Y, Z, and W, some
    need to go to Y, U, and V, etc., you obviously need a different
    label for each different multicast tree, and appropriate per-tree
    state.=C2=A0 <br>
    <br>
    Using a controller to set up multicast paths may be a good idea in
    some scenarios, but let&#39;s not pretend it doesn&#39;t create per-pat=
h
    state in the router.=C2=A0 Per-path (per-tree) is not the same as
    per-flow or per-group, of course, but that&#39;s true of any technique
    that aggregates flows into multicast tunnels.<br>
    <br>
    Note also that if the label X is domain-wide unique and there is no
    RPF check, there is the possibility of nasty multicast loops.=C2=A0 The=
se
    is some discussion of this in
    draft-zzhang-bess-bgp-<wbr>multicast-controller-00.<br>
    <br>
    <br>
    <br>
  </div>

</blockquote></div><br></div>

--00000000000099b547056e0f6f54--


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References: <8CCB28152EA2E14A96BBEDC15823481A1CB79F12@sjceml521-mbs.china.huawei.com> <16253F7987E4F346823E305D08F9115A99A7D4CE@nkgeml514-mbx.china.huawei.com> <CAHd-QWvx-tkP1Asx3PwM3p2=wjuJm7b=A4Hb-BUnCMRzwT1J8w@mail.gmail.com> <8CCB28152EA2E14A96BBEDC15823481A1CB7FBFE@sjceml521-mbs.china.huawei.com> <CAHd-QWu+184A3Nje_Bmki9A3wwpp=4YyyKTTkWBtLcf_gt7Lvg@mail.gmail.com> <75252B5F-6BCB-4166-ACC1-C9E9697B7B68@cisco.com>
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From: Rob Shakir <robjs@google.com>
Date: Thu, 7 Jun 2018 09:43:20 -0700
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To: "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
Cc: Michael McBride <Michael.McBride@huawei.com>, Xiejingrong <xiejingrong@huawei.com>,  "spring@ietf.org" <spring@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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Zafar,

I intentionally left the list of milestones out of the mail. Clearly, we
need to agree the areas of work before we can break this down into
milestones. Equally, we have more flexibility in defining these since they
do not need to be reviewed by the IESG.

On Wed, Jun 6, 2018 at 12:14 PM Zafar Ali (zali) <zali=
40cisco.com@dmarc.ietf.org> wrote:

>
>
> At IETF101, you and Bruno presented a slide based on the WG feedback on
> the mailing list (
> https://datatracker.ietf.org/meeting/101/materials/slides-101-spring-00-chairs-slides-01).
> During the Spring meeting, the WG agreed to add milestones to those items.
> In general, I see some milestones are not included in the proposed
> chartered text.
>
>
>
> Specifically, multicast in SR is included in that list with the "Ingress
> replication SID (Tree SID /spray)" bullet (and support during the WG
> meeting) but is missing in the proposed charter text. So, I agree with
> Xiejingrong and Michael highlighting the same. There is already interest
> and agreement shown by the WG to include multicast in SR in the charter.
>

This list was a recap of what had been discussed on the mailing list. It
was not the proposed exhaustive list. The preference in the charter text
(after much discussion) is to ensure that SPRING has a set of focus areas
to work on. This does not preclude interested individuals doing other work
- and even bringing it to SPRING. We can change the charter in the future
if new work comes up that isn't within the charter.

I would point out that the narrow scope that we (the SPRING WG) initially
had to deliver on has taken almost five years since we initially discussed
it (see this thread
<https://www.ietf.org/mail-archive/web/status/current/msg00242.html>
regarding chartering STATUS as it was at the time). In this period of time,
real deployments of SR have happened, and the standards that they rely on
have not yet been published.  This is unfortunate for those that have
shipping implementations, or are relying on behaviours in their network.

I'd encourage us to focus on defining the problem spaces that are most
important and then work on those, deliver a standard, and then move on to
the next area. We can usually determine the importance/relevance of the
work to networks based on the number of interested parties - so the
intention of the list in the charter is to capture those elements which we
perceived to have widest interest in the charter. At some point, there will
be a line that is either "in the charter" or not, and some things below it
at the current time - yes, that might mean that one's favourite SR
application is not currently in the charter, but if there is significant
discussion on the list, and work items being brought as individual drafts,
we can always address this with Martin.

Thanks,
r.

>

--0000000000002fdb4f056e0ffaea
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Zafar,<div><br></div><div>I intentionally left the list of=
 milestones out of the mail. Clearly, we need to agree the areas of work be=
fore we can break this down into milestones. Equally, we have more flexibil=
ity in defining these since they do not need to be reviewed by the IESG.<br=
><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Jun 6, 2018 at 12:=
14 PM Zafar Ali (zali) &lt;zali=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.=
org">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-6079669467314026768WordSection1">
<p class=3D"MsoNormal">=C2=A0<br></p><p class=3D"MsoNormal"><u></u></p>
<p class=3D"MsoNormal">At IETF101, you and Bruno presented a slide based on=
 the WG feedback on the mailing list (<a href=3D"https://datatracker.ietf.o=
rg/meeting/101/materials/slides-101-spring-00-chairs-slides-01" target=3D"_=
blank">https://datatracker.ietf.org/meeting/101/materials/slides-101-spring=
-00-chairs-slides-01</a>).
 During the Spring meeting, the WG agreed to add milestones to those items.=
 In general, I see some milestones are not included in the proposed charter=
ed text.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Specifically, multicast in SR is included in that li=
st with the &quot;Ingress replication SID (Tree SID /spray)&quot; bullet (a=
nd support during the WG meeting) but is missing in the proposed charter te=
xt. So, I agree with Xiejingrong and Michael
 highlighting the same. There is already interest and agreement shown by th=
e WG to include multicast in SR in the charter.</p></div></div></blockquote=
><div><br></div><div>This list was a recap of what had been discussed on th=
e mailing list. It was not the proposed exhaustive list. The preference in =
the charter text (after much discussion) is to ensure that SPRING has a set=
 of focus areas to work on. This does not preclude interested individuals d=
oing other work - and even bringing it to SPRING. We can change the charter=
 in the future if new work comes up that isn&#39;t within the charter.</div=
><div><br></div><div>I would point out that the narrow scope that we (the S=
PRING WG) initially had to deliver on has taken almost five years since we =
initially discussed it (see <a href=3D"https://www.ietf.org/mail-archive/we=
b/status/current/msg00242.html">this thread</a> regarding chartering STATUS=
 as it was at the time). In this period of time, real deployments of SR hav=
e happened, and the standards that they rely on have not yet been published=
.=C2=A0 This is unfortunate for those that have shipping implementations, o=
r are relying on behaviours in their network.</div><div><br></div><div>I&#3=
9;d encourage us to focus on defining the problem spaces that are most impo=
rtant and then work on those, deliver a standard, and then move on to the n=
ext area. We can usually determine the importance/relevance of the work to =
networks based on the number of interested parties - so the intention of th=
e list in the charter is to capture those elements which we perceived to ha=
ve widest interest in the charter. At some point, there will be a line that=
 is either &quot;in the charter&quot; or not, and some things below it at t=
he current time - yes, that might mean that one&#39;s favourite SR applicat=
ion is not currently in the charter, but if there is significant discussion=
 on the list, and work items being brought as individual drafts, we can alw=
ays address this with Martin.</div><div><br></div><div>Thanks,</div><div>r.=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlin=
k=3D"purple"><div class=3D"m_-6079669467314026768WordSection1"><div><div><d=
iv><div>
</div>
</div>
</div>
</div></div></div></blockquote></div></div></div>

--0000000000002fdb4f056e0ffaea--


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To: SPRING WG List <spring@ietf.org>
CC: "draft-ietf-spring-segment-routing-mpls@ietf.org" <draft-ietf-spring-segment-routing-mpls@ietf.org>
Thread-Topic: WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Hi all,

A quick update on the status of this WGLC:

- All the authors have responded about IPR (thank you!). Still missing repl=
ies from some contributors (Wim, Edward, Igor, Saku). I've sent them a remi=
nder this Monday.
- Two people (Zafar, Adrian) have responded supporting publication.
- No opposition.
- Two persons have sent comments (Adrian, myself). Thanks Adrian.
- Authors have not replied to any comment so far.
- The WGLC period was scheduled to end tomorrow.

I wish we had more support, reviews, and authors' involvement to reply to r=
eviews.

The WGLC is extended by a week. Please review the document and send your co=
mments to the list, no later than *June 15*

Thank you,
--Bruno

From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
Sent: Thursday, May 24, 2018 7:14 PM
To: SPRING WG List
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: WG Last Call for draft-ietf-spring-segment-routing-mpls-13


Hello Working Group,



This email starts a Working Group Last Call on draft-ietf-spring-segment-ro=
uting-mpls-13 [1] which is considered mature and ready for a final working =
group review.



Please read this document if you haven't read the most recent version yet, =
and send your comments to the list, no later than *June 08*.



As a reminder, this document had already passed a WGLC more than a year ago=
 on version -06 [2], had been sent to the AD but then returned to the WG.

Since then, the document has significantly changed, so please read it again=
. In particular, it now includes the resolution in case of incoming label c=
ollision. Hence it killed draft-ietf-spring-conflict-resolution.



Both co-chairs co-author this document, hence:

- Shraddha has agreed to be the document shepherd. Thank you Shraddha.

- Martin, our AD, has agreed to evaluate the WG consensus.



Thank you,

Bruno, Rob



[1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13

[2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y



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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black">Hi all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">A quick update=
 on the status of this WGLC:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- All the auth=
ors have responded about IPR (thank you!). Still missing replies from some =
contributors (</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-fa=
mily:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Wim,
 Edward, Igor, Saku</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">). I&#8217;=
ve sent them a reminder this Monday.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Two people (=
Zafar, Adrian) have responded supporting publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- No oppositio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Two persons =
have sent comments (Adrian, myself). Thanks Adrian.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Authors have=
 not replied to any comment so far.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- The WGLC per=
iod was scheduled to end tomorrow.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">I wish we had =
more support, reviews, and authors&#8217; involvement to reply to reviews.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">The WGLC is ex=
tended by a week. Please review the document and send your comments to the =
list, no later than *<b>June 15</b>*<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Thank you,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">--Bruno<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
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0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-language:FR">From:</span><=
/b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;san=
s-serif&quot;;mso-fareast-language:FR"> bruno.decraene@orange.com [mailto:b=
runo.decraene@orange.com]
<br>
<b>Sent:</b> Thursday, May 24, 2018 7:14 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Cc:</b> draft-ietf-spring-segment-routing-mpls@ietf.org<br>
<b>Subject:</b> WG Last Call for draft-ietf-spring-segment-routing-mpls-13<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span lang=3D"EN-US">Hello Working Group,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and =
ready for a final working group review.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven't read the=
 most recent version yet, and send your comments to the list, no later than=
 *June 08*.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-resolution.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
. Thank you Shraddha.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Thank you,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">[1] <a href=3D"https://tools.ietf.org/html/draft-=
ietf-spring-segment-routing-mpls-13">https://tools.ietf.org/html/draft-ietf=
-spring-segment-routing-mpls-13</a><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">[2] <a href=3D"https://mailarchive.ietf.org/arch/=
msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y">https://mailarchive.ietf.org/arch/m=
sg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-family:&quot;Arial&quot;,&quot;sans=
-serif&quot;"><o:p>&nbsp;</o:p></span></pre>
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<pre>a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
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<PRE>______________________________________________________________________=
___________________________________________________

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing Policy for Traffic Engineering
        Authors         : Clarence Filsfils
                          Siva Sivabalan
                          Daniel Voyer
                          Alex Bogdanov
                          Paul Mattes
	Filename        : draft-ietf-spring-segment-routing-policy-00.txt
	Pages           : 49
	Date            : 2018-06-04

Abstract:
   Segment Routing allows a headend node to steer a packet flow along
   any path.  Intermediate per-flow states are eliminated thanks to
   source routing.  The headend node steers a flow into an SR Policy.
   The header of a packet steered in an SR Policy is augmented with the
   ordered list of segments associated with that SR Policy.  This
   document details the concepts of SR Policy and steering into an SR
   Policy.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-00
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-policy-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
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From: David Allan I <david.i.allan@ericsson.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Voyer, Daniel" <daniel.voyer@bell.ca>, "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
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Thread-Topic: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Rob Shakir <robjs@google.com>
Date: Thu, 7 Jun 2018 10:10:18 -0700
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To: David Allan I <david.i.allan@ericsson.com>
Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>,  "Voyer, Daniel" <daniel.voyer@bell.ca>, "Zafar Ali (zali)" <zali@cisco.com>,  Michael McBride <Michael.McBride@huawei.com>, Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
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On Thu, Jun 7, 2018 at 10:06 AM David Allan I <david.i.allan@ericsson.com>
wrote:

> Would not the existence of SRLB=E2=80=99s be an existence proof of per-pa=
th state
> at transit nodes in the SPRING architecture?
>

No - SRLBs are just label block allocations on that node. The labels
allocated from an SRLB continue to be per-forwarding behaviour, not
per-path. In the degenerate case, we might have a 1:1 mapping of forwarding
behaviour to path, but this is implementation specific.

To demonstrate: consider the case that some programming entity creates a
SID that means forward to SR label stacks 1, 2, 3 -- this can be used by
any number of TE paths that are within that network.

r.

>

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<div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Thu=
, Jun 7, 2018 at 10:06 AM David Allan I &lt;<a href=3D"mailto:david.i.allan=
@ericsson.com">david.i.allan@ericsson.com</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_5395568625098463101WordSection1">
<p class=3D"MsoNormal">Would not the existence of SRLB=E2=80=99s be an exis=
tence proof of per-path state at transit nodes in the SPRING architecture?<=
/p></div></div></blockquote><div><br></div><div>No - SRLBs are just label b=
lock allocations on that node. The labels allocated from an SRLB continue t=
o be per-forwarding behaviour, not per-path. In the degenerate case, we mig=
ht have a 1:1 mapping of forwarding behaviour to path, but this is implemen=
tation specific.</div><div><br></div><div>To demonstrate: consider the case=
 that some programming entity creates a SID that means forward to SR label =
stacks 1, 2, 3 -- this can be used by any number of TE paths that are withi=
n that network.</div><div><br></div><div>r.</div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_539=
5568625098463101WordSection1"><p class=3D"MsoNormal"><u></u></p></div></div=
></blockquote></div></div>

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From: Joel Halpern <jmh@joelhalpern.com>
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Reviewer: Joel Halpern
Review result: Ready

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair. Please wait for direction from your
document shepherd or AD before posting a new version of the draft.

For more information, please see the FAQ at

<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: draft-ietf-spring-segment-routing-ldp-interop-12
Reviewer: Joel Halpern
Review Date: 2018-06-07
IETF LC End Date: 2018-05-24
IESG Telechat date: 2018-06-21

Summary: This document is ready to be published as a Proposed Standard

The authors' additions of material to explain the SRMS both addresses by
earlier concerns and provides sufficient motivation for publishing this as a
PS.  My thanks to the authors for their work.

Major issues:

Minor issues:

Nits/editorial comments:



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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: David Allan I <david.i.allan@ericsson.com>, Rob Shakir <robjs@google.com>
CC: "Voyer, Daniel" <daniel.voyer@bell.ca>, "Zafar Ali (zali)" <zali@cisco.com>, Michael McBride <michael.mcbride@huawei.com>, Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/MsEU-jUyOULRpphxIkLwaf6WNos>
Subject: Re: [spring] Updating the SPRING WG Charter
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Dave, Rob and all,
I concur with Rob on this point.

Thumb typed by Sasha Vainshtein

________________________________
From: Rob Shakir <robjs@google.com>
Sent: Thursday, June 7, 2018 8:10:18 PM
To: David Allan I
Cc: Alexander Vainshtein; Voyer, Daniel; Zafar Ali (zali); Michael McBride=
; Xiejingrong; spring@ietf.org
Subject: Re: [spring] Updating the SPRING WG Charter



On Thu, Jun 7, 2018 at 10:06 AM David Allan I <david.i.allan@ericsson.com<=
mailto:david.i.allan@ericsson.com>> wrote:
Would not the existence of SRLB=92s be an existence proof of per-path stat=
e at transit nodes in the SPRING architecture?

No - SRLBs are just label block allocations on that node. The labels alloc=
ated from an SRLB continue to be per-forwarding behaviour, not per-path. I=
n the degenerate case, we might have a 1:1 mapping of forwarding behaviour=
 to path, but this is implementation specific.

To demonstrate: consider the case that some programming entity creates a S=
ID that means forward to SR label stacks 1, 2, 3 -- this can be used by an=
y number of TE paths that are within that network.

r.

__________________________________________________________________________=
_

This e-mail message is intended for the recipient only and contains inform=
ation which is=20
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this=20
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-=
1252">
<meta content=3D"text/html; charset=3Dutf-8">
</head>
<body>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Dave, Rob and all,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
I concur with Rob on this point.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Thumb typed by Sasha Vainshtein</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" c=
olor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Rob Shakir &lt;robj=
s@google.com&gt;<br>
<b>Sent:</b> Thursday, June 7, 2018 8:10:18 PM<br>
<b>To:</b> David Allan I<br>
<b>Cc:</b> Alexander Vainshtein; Voyer, Daniel; Zafar Ali (zali); Michael =
McBride; Xiejingrong; spring@ietf.org<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter</font>
<div>&nbsp;</div>
</div>
<div>
<div dir=3D"ltr"><br>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr">On Thu, Jun 7, 2018 at 10:06 AM David Allan I &lt;<a href=
=3D"mailto:david.i.allan@ericsson.com">david.i.allan@ericsson.com</a>&gt; =
wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex; border-left:=
1px #ccc solid; padding-left:1ex">
<div lang=3D"EN-US">
<div class=3D"m_5395568625098463101WordSection1">
<p class=3D"MsoNormal">Would not the existence of SRLB=92s be an existence=
 proof of per-path state at transit nodes in the SPRING architecture?</p>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>No - SRLBs are just label block allocations on that node. The labels =
allocated from an SRLB continue to be per-forwarding behaviour, not per-pa=
th. In the degenerate case, we might have a 1:1 mapping of forwarding beha=
viour to path, but this is implementation
 specific.</div>
<div><br>
</div>
<div>To demonstrate: consider the case that some programming entity create=
s a SID that means forward to SR label stacks 1, 2, 3 -- this can be used =
by any number of TE paths that are within that network.</div>
<div><br>
</div>
<div>r.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex; border-left:=
1px #ccc solid; padding-left:1ex">
<div lang=3D"EN-US">
<div class=3D"m_5395568625098463101WordSection1">
<p class=3D"MsoNormal"><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this <BR>
transmission in error, please inform us by e-mail, phone or fax, and then =
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and all copies thereof.<BR>
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Date: Thu, 7 Jun 2018 23:52:35 -0700
Cc: Rob Shakir <robjs@google.com>, RFC System <rfc-editor@rfc-editor.org>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, stefano@previdi.net, "bruno.decraene@orange.com> <bruno.decraene@orange.com" <bruno.decraene@orange.com>, "BRUNGARD, DEBORAH A" <db3546@att.com>, Alvaro Retana <aretana.ietf@gmail.com>, Martin Vigoureux <martin.vigoureux@nokia.com>, spring@ietf.org
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To: James Bensley <jwbensley@gmail.com>
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Subject: Re: [spring] [Editorial Errata Reported] RFC8355 (5380)
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Hi James,

Yes - looks like a legitimate error/typo.  Feel free to submit an =
editorial errata report and we can verify it.

RFC Editor/mf


On Jun 7, 2018, at 7:51 AM, James Bensley <jwbensley@gmail.com> wrote:

> Also, last sentence of RFC7855 on page 3:
>=20
>   Hence, the policy is instantiated in the packet header and does not
>   requires any policy state in midpoints and tail-ends.
>=20
> "require" ?


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The following errata report has been submitted for RFC7855,
"Source Packet Routing in Networking (SPRING) Problem Statement and Requirements".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5384

--------------------------------------
Type: Editorial
Reported by: James Bensley <jwbensley@gmail.com>

Section: 3.3.1.1.1

Original Text
-------------
      C1k has a link to C2j iff k = j.

         The core nodes of a given region are directly connected.
         Inter-region links only connect core nodes of the same plane.

      {C1k has a link to C1j} iff {C2k has a link to C2j}.

Corrected Text
--------------
      C1k has a link to C2j if k = j.

         The core nodes of a given region are directly connected.
         Inter-region links only connect core nodes of the same plane.

      {C1k has a link to C1j} if {C2k has a link to C2j}.

Notes
-----
Does "iff" mean something special that is different to "if" or is this a typo? If the former, should it be called out in a glossary?

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--------------------------------------
RFC7855 (draft-ietf-spring-problem-statement-08)
--------------------------------------
Title               : Source Packet Routing in Networking (SPRING) Problem Statement and Requirements
Publication Date    : May 2016
Author(s)           : S. Previdi, Ed., C. Filsfils, Ed., B. Decraene, S. Litkowski, M. Horneffer, R. Shakir
Category            : INFORMATIONAL
Source              : Source Packet Routing in Networking
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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The following errata report has been submitted for RFC7855,
"Source Packet Routing in Networking (SPRING) Problem Statement and Requirements".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5385

--------------------------------------
Type: Editorial
Reported by: James Bensley <jwbensley@gmail.com>

Section: 1

Original Text
-------------
   Hence, the policy is instantiated in the packet header and does not
   requires any policy state in midpoints and tail-ends.

Corrected Text
--------------
   Hence, the policy is instantiated in the packet header and does not
   require any policy state in midpoints and tail-ends.

Notes
-----
require/requires - singular/plural.

Instructions:
-------------
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use "Reply All" to discuss whether it should be verified or
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can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC7855 (draft-ietf-spring-problem-statement-08)
--------------------------------------
Title               : Source Packet Routing in Networking (SPRING) Problem Statement and Requirements
Publication Date    : May 2016
Author(s)           : S. Previdi, Ed., C. Filsfils, Ed., B. Decraene, S. Litkowski, M. Horneffer, R. Shakir
Category            : INFORMATIONAL
Source              : Source Packet Routing in Networking
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


From nobody Fri Jun  8 02:50:35 2018
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James,

I believe "iff" was intended as written.

https://en.wikipedia.org/wiki/If_and_only_if

Adrian

> -----Original Message-----
> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of RFC Errata System
> Sent: 08 June 2018 09:11
> To: sprevidi@cisco.com; cfilsfil@cisco.com; bruno.decraene@orange.com;
> stephane.litkowski@orange.com; Martin.Horneffer@telekom.de; rjs@rob.sh;
> db3546@att.com; aretana.ietf@gmail.com; martin.vigoureux@nokia.com;
> bruno.decraene@orange.com; robjs@google.com
> Cc: spring@ietf.org; rfc-editor@rfc-editor.org; jwbensley@gmail.com
> Subject: [spring] [Editorial Errata Reported] RFC7855 (5384)
> 
> The following errata report has been submitted for RFC7855,
> "Source Packet Routing in Networking (SPRING) Problem Statement and
> Requirements".
> 
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata/eid5384
> 
> --------------------------------------
> Type: Editorial
> Reported by: James Bensley <jwbensley@gmail.com>
> 
> Section: 3.3.1.1.1
> 
> Original Text
> -------------
>       C1k has a link to C2j iff k = j.
> 
>          The core nodes of a given region are directly connected.
>          Inter-region links only connect core nodes of the same plane.
> 
>       {C1k has a link to C1j} iff {C2k has a link to C2j}.
> 
> Corrected Text
> --------------
>       C1k has a link to C2j if k = j.
> 
>          The core nodes of a given region are directly connected.
>          Inter-region links only connect core nodes of the same plane.
> 
>       {C1k has a link to C1j} if {C2k has a link to C2j}.
> 
> Notes
> -----
> Does "iff" mean something special that is different to "if" or is this a typo?
If the
> former, should it be called out in a glossary?
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if necessary.
> 
> --------------------------------------
> RFC7855 (draft-ietf-spring-problem-statement-08)
> --------------------------------------
> Title               : Source Packet Routing in Networking (SPRING) Problem
Statement
> and Requirements
> Publication Date    : May 2016
> Author(s)           : S. Previdi, Ed., C. Filsfils, Ed., B. Decraene, S.
Litkowski, M.
> Horneffer, R. Shakir
> Category            : INFORMATIONAL
> Source              : Source Packet Routing in Networking
> Area                : Routing
> Stream              : IETF
> Verifying Party     : IESG
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Robert Raszuk <robert@raszuk.net>
CC: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <Michael.McBride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>, "Voyer, Daniel" <daniel.voyer@bell.ca>, Eric C Rosen <erosen@juniper.net>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/8qkOa9CXuVuvUL61MN_ochQW6kU>
Subject: Re: [spring] Updating the SPRING WG Charter
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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 8 Jun 2018 16:59:09 +0200
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <Michael.McBride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>, "Voyer, Daniel" <daniel.voyer@bell.ca>, Eric C Rosen <erosen@juniper.net>
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Subject: Re: [spring] Updating the SPRING WG Charter
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Sasha,

> because usage of domain-wide labels has been discussed many times in the
past and rejected by the MPLS WG.

That comment I quite do not follow. Entire concept of SR-MPLS  is based on
domain wide labels (distributed via IGP or OOB) and my description applies
to SR based networks with both MPLS as well as v6 encap.

In other words we already have domain wide MPLS labels to indicate various
types of segments. What I proposed would at most require perhaps new type
which would embed node + replication function.

Thx,
R.


On Fri, Jun 8, 2018 at 4:53 PM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Robert,
>
> I concur with Eric.
>
>
>
> I also think that the scenarios you describe as relevant for
> SR-fan-out/SR-spray (=E2=80=9Capplications which on one side do not reall=
y
> require full multicast yet they would benefit with content to be send onc=
e
> from server and arrived at two or more caches=E2=80=9D) strongly resemble=
s
> IGMP/MLD Proxy applications (RFC 4605
> <https://tools.ietf.org/html/rfc4605>). Is such an analogy correct?
>
>
>
> Last but not least, it seems that your description of SR-fan-out mandates
> usage of domain-wide labels (mentioned by Eric as well_. If this is indee=
d
> so, I consider this as a stopper because usage of domain-wide labels has
> been discussed many times in the past and rejected by the MPLS WG.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> *From:* rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On Behalf Of *Rober=
t
> Raszuk
> *Sent:* Thursday, June 7, 2018 7:04 PM
> *To:* Eric C Rosen <erosen@juniper.net>
> *Cc:* Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>;
> spring@ietf.org; Xiejingrong <xiejingrong@huawei.com>; Michael McBride <
> Michael.McBride@huawei.com>; Rob Shakir <robjs=3D40google.com@dmarc.ietf.=
org>;
> Zafar Ali (zali) <zali@cisco.com>; Voyer, Daniel <daniel.voyer@bell.ca>
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Eric,
>
>
>
> The way I look at this is really not from the perspective of true dynamic
> multicast with tree building etc .. .I look at this as anchor points to
> replicate unicast flows into two or more endpoints maybe once or twice in
> entire domain.
>
>
>
> So for sure if you would try to apply this technique to distribute
> traditional multicast there is tons of things which can go wrong and you
> are better off with BIER.
>
>
>
> But there are applications which on one side do not really require full
> multicast yet they would benefit with content to be send once from server
> and arrived at two or more caches. Maybe we just don't have the right nam=
e
> for it in networking yet :)
>
>
>
> Cheers,
> R.
>
>
>
>
>
> On Thu, Jun 7, 2018 at 5:52 PM, Eric C Rosen <erosen@juniper.net> wrote:
>
> On 6/7/2018 10:55 AM, Robert Raszuk wrote:
>
> Imagine a segment with embedded meaning that packets received with such
> value X should be replicated to interfaces  Y & Z. Such decision can be
> configured from controller or locally computed.
>
>
>
> Nothing there is per-path as well as nothing there is per flow or per
> multicast group. It is a local function.
>
>
> How can you say "nothing there per-path"?  The label X represents a
> multicast tree, and thus constitutes per-path state.    If some packets
> need to go to Y and Z, some need to go to Y, Z, and W, some need to go to
> Y, U, and V, etc., you obviously need a different label for each differen=
t
> multicast tree, and appropriate per-tree state.
>
> Using a controller to set up multicast paths may be a good idea in some
> scenarios, but let's not pretend it doesn't create per-path state in the
> router.  Per-path (per-tree) is not the same as per-flow or per-group, of
> course, but that's true of any technique that aggregates flows into
> multicast tunnels.
>
> Note also that if the label X is domain-wide unique and there is no RPF
> check, there is the possibility of nasty multicast loops.  These is some
> discussion of this in draft-zzhang-bess-bgp-multicast-controller-00.
>
>
>
>
> ____________________________________________________________
> _______________
>
> This e-mail message is intended for the recipient only and contains
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> CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have
> received this
> transmission in error, please inform us by e-mail, phone or fax, and then
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> and all copies thereof.
> ____________________________________________________________
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>

--000000000000701b67056e22a473
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Sasha,</div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small">

<span style=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-siz=
e:14.6667px;background-color:rgb(255,255,255);text-decoration-style:initial=
;text-decoration-color:initial;float:none;display:inline">&gt; because usag=
e of domain-wide labels has been discussed many times in the past and rejec=
ted by the MPLS WG.</span>

<br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">That comment I =
quite do not follow. Entire concept of SR-MPLS=C2=A0 is based on domain wid=
e labels (distributed via IGP or OOB) and my description applies to SR base=
d networks with both MPLS as well as v6 encap.=C2=A0</div><div class=3D"gma=
il_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small=
"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small">In other words we already have domain wide M=
PLS labels to indicate various types of segments. What I proposed would at =
most require perhaps new type which would embed node + replication function=
.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small">Thx,<br>R.</di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small"><br></div></div><div class=3D"gmail_extra"><br><div cl=
ass=3D"gmail_quote">On Fri, Jun 8, 2018 at 4:53 PM, Alexander Vainshtein <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" tar=
get=3D"_blank">Alexander.Vainshtein@ecitele.com</a>&gt;</span> wrote:<br><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_8016058777786728409WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I concur with Eric.<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I also think that the scenarios you d=
escribe as relevant for SR-fan-out/SR-spray (=E2=80=9C</span><span style=3D=
"font-family:&quot;Arial&quot;,sans-serif;background:yellow">applications
 which on one side do not really require full multicast yet they would bene=
fit with content to be send once from server and arrived at two or more cac=
hes</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d">=E2=80=9D) strongly resembles
 IGMP/MLD Proxy applications (<a href=3D"https://tools.ietf.org/html/rfc460=
5" target=3D"_blank">RFC 4605</a>). Is such an analogy correct?<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Last but not least, it seems that you=
r description of SR-fan-out mandates usage of domain-wide labels (mentioned=
 by Eric as well_. If this is indeed so, I consider
 this as a stopper because usage of domain-wide labels has been discussed m=
any times in the past and rejected by the MPLS WG.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p><spa=
n class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Office: +972-39266302<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=
972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Email:=C2=A0=C2=A0 <a href=3D"mailto:=
Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ec=
itele.<wbr>com</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</span><p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-famil=
y:&quot;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> <a href=3D"mailto:rrasz=
uk@gmail.com" target=3D"_blank">rraszuk@gmail.com</a> [mailto:<a href=3D"ma=
ilto:rraszuk@gmail.com" target=3D"_blank">rraszuk@gmail.com</a>]
<b>On Behalf Of </b>Robert Raszuk<br>
<b>Sent:</b> Thursday, June 7, 2018 7:04 PM<br>
<b>To:</b> Eric C Rosen &lt;<a href=3D"mailto:erosen@juniper.net" target=3D=
"_blank">erosen@juniper.net</a>&gt;<br>
<b>Cc:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com" target=3D"_blank">Alexander.Vainshtein@ecitele.<wbr>com</a>&gt=
;; <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>=
; Xiejingrong &lt;<a href=3D"mailto:xiejingrong@huawei.com" target=3D"_blan=
k">xiejingrong@huawei.com</a>&gt;; Michael McBride &lt;<a href=3D"mailto:Mi=
chael.McBride@huawei.com" target=3D"_blank">Michael.McBride@huawei.com</a>&=
gt;; Rob Shakir &lt;robjs=3D<a href=3D"mailto:40google.com@dmarc.ietf.org" =
target=3D"_blank">40google.com@dmarc.<wbr>ietf.org</a>&gt;; Zafar Ali (zali=
) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</a=
>&gt;; Voyer,
 Daniel &lt;<a href=3D"mailto:daniel.voyer@bell.ca" target=3D"_blank">danie=
l.voyer@bell.ca</a>&gt;<span class=3D""><br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter<u></u><u></u></=
span></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Hi Eric,<u></u><u></u></span></p>
</div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">The way I look at this is really not from the perspective of true dyna=
mic multicast with tree building etc .. .I look at this as anchor points to=
 replicate unicast flows into two or more endpoints
 maybe once or twice in entire domain.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">So for sure if you would try to apply this technique to distribute tra=
ditional multicast there is tons of things which can go wrong and you are b=
etter off with BIER.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">But there are applications which on one side do not really require ful=
l multicast yet they would benefit with content to be send once from server=
 and arrived at two or more caches. Maybe we just
 don&#39;t have the right name for it in networking yet :)=C2=A0<u></u><u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Cheers,<br>
R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
</div></div></div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Thu, Jun 7, 2018 at 5:52 PM, Eric C Rosen &lt;<a =
href=3D"mailto:erosen@juniper.net" target=3D"_blank">erosen@juniper.net</a>=
&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p class=3D"MsoNormal">On 6/7/2018 10:55 AM, Robert Raszuk wrote:<br>
<br>
<u></u><u></u></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Imagine a segment with embedded meaning that packets received with suc=
h value X should be replicated to interfaces=C2=A0 Y &amp; Z. Such decision=
 can be configured from controller or locally computed.=C2=A0<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Nothing there is per-path as well as nothing there is per flow or per =
multicast group. It is a local function.=C2=A0<u></u><u></u></span></p>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
How can you say &quot;nothing there per-path&quot;?=C2=A0 The label X repre=
sents a multicast tree, and thus constitutes per-path state.=C2=A0=C2=A0=C2=
=A0 If some packets need to go to Y and Z, some need to go to Y, Z, and W, =
some need to go to Y, U, and V, etc., you obviously need a different
 label for each different multicast tree, and appropriate per-tree state.=
=C2=A0 <br>
<br>
Using a controller to set up multicast paths may be a good idea in some sce=
narios, but let&#39;s not pretend it doesn&#39;t create per-path state in t=
he router.=C2=A0 Per-path (per-tree) is not the same as per-flow or per-gro=
up, of course, but that&#39;s true of any technique
 that aggregates flows into multicast tunnels.<br>
<br>
Note also that if the label X is domain-wide unique and there is no RPF che=
ck, there is the possibility of nasty multicast loops.=C2=A0 These is some =
discussion of this in draft-zzhang-bess-bgp-<wbr>multicast-controller-00.<b=
r>
<br>
<br>
<u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
<br clear=3D"both"><span class=3D"">
______________________________<wbr>______________________________<wbr>_____=
__________<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is <br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this <br>
transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original <br>
and all copies thereof.<br>
______________________________<wbr>______________________________<wbr>_____=
__________<br>
</span></div>


</blockquote></div><br></div>

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Content-Type: text/plain; charset="UTF-8"

SPRING WG,

I generally support publication of
draft-ietf-spring-segment-routing-mpls. However, I think
that the text in sections 2.5 and 2.6 (on incoming label collisions)
needs some work before publication. This text was added to
the draft a few months ago, and has not gotten much review
from the WG as a whole. The review and proposed text below
focuses on these sections.

As I understand the current text of the draft, the general
approach to resolving incoming label collisions seems
well-reasoned and complete.  However, it is possible that
my interpretation of these tie-breaking rules is
not what the authors intended.

I'd like to propose the examples below to be included
in the draft to help clarify the tie-breaking rules
for incoming label collisions described in section 2.5.
I have highlighted several cases in these examples,
where I think the rules in section 2.5 need
to be clarified in order to unambiguously determine
the winning FEC in an example.

It may also be the case that the authors or other
WG participants will disagree with the interpretation of the
rules used to choose a winning FEC in some of these
examples.  In that case, we should discuss
what is the correct interpretation, and clarify the
text in the draft to make the correct interpretation
clear.


Incoming label collision examples
=========

Node A
OSPF default admin distance for implementation=50
ISIS default admin distance for implementation=60

=========
Example incoming label conflict for label=1005 on node A

FEC1)
OSPF prefix sid advertisement from node B for 198.51.100.5/32 with index=5
OSPF SRGB on node A = [1000,1999]
Incoming label=1005

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.105/32 with index=5
ISIS SRGB on node A = [1000,1999]
Incoming label=1005

FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
the FEC types is SR Policy, we use the default admin distances of 50
and 60 to break the tie.  So FEC1 wins.

=========
Example incoming label conflict for label=1006 on node A

FEC1)
OSPF prefix sid advertisement from node B for 198.51.100.6/32 with index=6
OSPF SRGB on node A = [1000,1999]
Incoming label=1006

FEC2)
ISIS adjacency sid advertisement from node A with label=1006
Incoming label=1006
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
the FEC types is SR Policy, we use the default admin distances of 50
and 60 to break the tie.  So FEC1 wins.

=========
Example incoming label conflict for label=1007 on node A

FEC1)
OSPF prefix sid advertisement from node B for 198.51.100.7/32 with index=7
OSPF SRGB on node A = [1000,1999]
Incoming label=1007

FEC2)
ISIS adjacency sid advertisement from node A with label=1007
Incoming label=1007
Node A assigns this adjacency SID explicitly via configuration,
so the adjacency SID survives router reboots.

FEC1 uses dynamic SID assignment, while FEC2 uses explicit SID
assignment. So FEC2 wins.

=========
Example incoming label conflict for label=1008 on node A

FEC1)
OSPF prefix sid advertisement from node B for 198.51.100.8/32 with index=8
OSPF SRGB on node A = [1000,1999]
Incoming label=1008

FEC2)
SR Policy advertisement from controller to node A
Endpoint = 192.0.2.208, color = 100, SID-List = <S1, S2>
Binding-SID label = 1008

FEC1 and FEC2 both use dynamic SID assignment.
Since one of the FEC types is SR Policy, default admin
distance is not used to break the tie.
/* The text in Section 2.5.1 needs to be clarified to specify
whether SR Policy always loses or always wins in this case. */

=========
Example incoming label conflict for label=1009 on node A

FEC1)
OSPF adjacency sid advertisement by node A with label=1009
Incoming label=1009
Node A assigns this adjacency SID explicitly via configuration,
so the adjacency SID survives router reboots.

FEC2)
ISIS adjacency sid advertisement by node A with label=1009
Incoming label=1009
Node A assigns this adjacency SID explicitly via configuration,
so the adjacency SID survives router reboots.

FEC1 and FEC2 both use explicit SID assignment.  This kind of
incoming label collision should never occur, since an
implement of explicit SID assignment MUST guarantee
collision freeness on the same router.

========
Example incoming label conflict for label=1010 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.110/32 with index=10
ISIS SRGB on node A = [1000,1999]
Incoming label=1010

FEC2)
ISIS adjacency sid advertisement by node A with label=1010
Incoming label=1010
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
are from the same MCC, they have the same default admin distance.
So we compare FEC type code-point.  FEC1 has FEC type
code-point=120, while FEC2 has FEC type code-point=130.
Therefore, FEC1 wins.

=========
Example incoming label conflict for label=1011 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.111/32 with index=11
ISIS SRGB on node A = [1000,1999]
Incoming label=1011

FEC2)
ISIS prefix sid advertisement from node C for 2001:DB8:1000::11/128 with
index=11
ISIS SRGB on node A = [1000,1999]
Incoming label=1011

FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
are from the same MCC, they have the same default admin distance.
So we compare FEC type code-point.  Both FECs have FEC type
code-point=120. So we compare address family.  Since IPv4 is
preferred over IPv6, FEC1 wins.

=========
Example incoming label conflict for label=1012 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.112/32 with index=12
ISIS SRGB on node A = [1000,1999]
Incoming label=1012

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.128/30 with index=12
ISIS SRGB on node A = [1000,1999]
Incoming label=1012

FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
are from the same MCC, they have the same default admin distance.
So we compare FEC type code-point.  Both FECs have FEC type
code-point=120. So we compare address family.  Both are IPv4 address
family, so we compare prefix length.  FEC1 has prefix length=32,
and FEC2 has prefix length=30, so FEC2 wins.

=========
Example incoming label conflict for label=1013 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.113/32 with index=13
ISIS SRGB on node A = [1000,1999]
Incoming label=1013

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.213/32 with index=13
ISIS SRGB on node A = [1000,1999]
Incoming label=1013

FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
are from the same MCC, they have the same default admin distance.
So we compare FEC type code-point.  Both FECs have FEC type
code-point=120. So we compare address family.  Both are IPv4 address
family, so we compare prefix length.  Prefix lengths are the same,
so we compare prefix.  FEC1 has the lower prefix, so FEC1 wins.

=========
Example incoming label conflict for label=1014 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.114/32 with index=14
Routing Instance ID = 1000
ISIS SRGB on node A = [1000,1999]
Incoming label=1014

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.114/32 with index=14
Routing Instance ID = 2000
ISIS SRGB on node A = [1000,1999]
Incoming label=1014

These two FECs match all the way through the prefix length and prefix.
So Routing Instance ID breaks the tie, with FEC1 winning.

=========
Example incoming label conflict for label=1015 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.115/32 with index=15
Routing Instance ID = 1000
ISIS Multi-topology ID = 50
ISIS SRGB on node A = [1000,1999]
Incoming label=1015

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.115/32 with index=15
Routing Instance ID = 1000
ISIS Multi-topology ID = 40
ISIS SRGB on node A = [1000,1999]
Incoming label=1015

These two FECs match all the way through the prefix length, prefix, and
Routing Instance ID.  We compare ISIS Multi-topology ID, so FEC2 wins.

/* There appears to be a typo in section 2.5.1, with two different
orderings shown for a prefix-based FEC:
Prefix, Routing Instance, Topology, Algorithm
and
(Prefix Length, Prefix, SR Algorithm, routing_instance_id, Topology)
This needs to be corrected. */

=========
Example incoming label conflict for label=1016 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.116/32 with index=16
Routing Instance ID = 1000
ISIS Multi-topology ID = 50
SR algorithm = 0
ISIS SRGB on node A = [1000,1999]
Incoming label=1016

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.116/32 with index=16
Routing Instance ID = 1000
ISIS Multi-topology ID = 50
SR algorithm = 22
ISIS SRGB on node A = [1000,1999]
Incoming label=1016

These two FECs match all the way through the prefix length, prefix, and
Routing Instance ID, and Multi-topology ID. We compare SR algorithm ID, so
FEC1 wins.

=========
Example incoming label conflict for label=1017 on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.117/32 with index=17
ISIS SRGB on node A = [1000,1999]
Incoming label=1017

FEC2)
ISIS mapping server advertisement (SID/Label Binding TLV) from node D:
Range=100, Prefix = 203.0.113.1/32
This mapping server advertisment generates 100 mappings, one of which
maps 203.0.113.17/32 to index=17.
ISIS SRGB on node A = [1000,1999]
Incoming label=1017

The fact that FEC1 comes from a normal prefix sid advertisement and
FEC2 is generated from a mapping server advertisement is not
used as a tie-breaking parameter. Both FECs use dynamic SID assignment,
are from the same MCC, have the same FEC type code-point=120. Their prefix
lengths are the same as well.  FEC2 wins based on lower numerical prefix
value,
since 203.0.113.17 is less than 203.0.113.117.

=========
Example incoming label conflict for label=1018 on node A

FEC1)
ISIS IPv4 adjacency sid advertisement from node A with label=1018
corresponding to next-hop interface address=192.0.2.100, outgoing interface
ID=5
Incoming label=1018
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

FEC2)
ISIS IPv6 adjacency sid advertisement from node A with label=1018
corresponding to 2001:DB8:2000::100/128, outgoing interface ID=6.
Incoming label=1018
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

Both FECs use dynamic SID assignment, are from the same MCC,
and have the same FEC type code-point=130.  FEC1 wins
because IPv4 address family is preferred over IPv6.

=========
Example incoming label conflict for label=1019 on node A

FEC1)
ISIS IPv4 adjacency sid advertisement from node A with label=1019
corresponding to next-hop interface address=192.0.2.220, outgoing interface
ID=7
Incoming label=1019
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

FEC2)
ISIS IPv4 adjacency sid advertisement from node A with label=1019
corresponding to next-hop interface address=192.0.2.230, outgoing interface
ID=8
Incoming label=1019
Node A allocates this adjacency SID dynamically,
and it may differ across router reboots.

Both FECs use dynamic SID assignment, are from the same MCC,
and have the same FEC type code-point=130. Both FECs have to
same address family.  FEC1 wins based on having the lowest next-hop
interface address.

/* It is not clear how to construct an example that
would result in using the outgoing interface ID as a tie-breaker.
It would be useful to understand why this is and clarify
it in the text. */
=========
Example incoming label conflict for label=1020 on node A

FEC1)
SR Policy advertisement from controller to node A
Endpoint address=2001:DB8:3000::100, color=100, SID-List=<S1, S2>
Binding-SID label=1020

FEC2)
SR Policy advertisement from controller to node A
Endpoint address=192.0.2.60, color=100, SID-List=<S3, S4>
Binding-SID label=1020

The FECs match through the tie-breaks up to and including
having the same FEC type code-point=140.
FEC2 wins based on IPv4 address family being preferred
over IPv6.

=========
Example incoming label conflict for label=1021 on node A

FEC1)
SR Policy advertisement from controller to node A
Endpoint address=192.0.2.70, color=100, SID-List=<S1, S2>
Binding-SID label=1021

FEC2)
SR Policy advertisement from controller to node A
Endpoint address=192.0.2.71, color=100, SID-List=<S3, S4>
Binding-SID label=1021

The FECs match through the tie-breaks up to and including
having the same address family. FEC1 wins by having the
lower numerical endpoint address value.

=========

I'd like to propose the examples below to be included
in the draft to help clarify section 2.6
(currently entitled "Outgoing Label Collision").


Examples of the Effect Incoming Label Collision on Outgoing Label
Programming
====================================

Example of effect of incoming label collision for label=1022
on outgoing label programming on node A

FEC1)
ISIS prefix sid advertisement from node B for 203.0.113.122/32 with index=22
ISIS SRGB on node A = [1000,1999]
Incoming label=1022

FEC2)
ISIS prefix sid advertisement from node C for 203.0.113.222/32 with index=22
ISIS SRGB on node A = [1000,1999]
Incoming label=1022

FEC1 wins based on lowest numerical prefix value.  This means that node A
installs a transit MPLS forwarding entry to SWAP incoming label=1022, with
outgoing label N,
and use outgoing interace I. N is determined by the index associated with
FEC1 (index=22) and
the SRGB advertised by the next-hop node on the shortest path to reach
203.0.113.122/32.

Node A will generally also install an ingress MPLS forwarding entry
corresponding to FEC1 for
incoming prefix=203.0.113.122/32 pushing outgoing label N, and using
outgoing interace I.

The rule in section 2.6 means that node A MUST NOT install an ingress MPLS
forwarding entry
corresponding to FEC2 ( which would be for incoming prefix=203.0.113.222/32).

========

Example of effect of incoming label collision for label=1023
on outgoing label programming on node A

FEC1)
SR Policy advertisement from controller to node A
Endpoint address=192.0.2.80, color=100, SID-List=<S1, S2>
Binding-SID label=1023

FEC2)
SR Policy advertisement from controller to node A
Endpoint address=192.0.2.81, color=100, SID-List=<S3, S4>
Binding-SID label=1023

FEC1 wins by having the lower numerical endpoint address value. This means
that node A
installs a transit MPLS forwarding entry to SWAP incoming label=1023, with
outgoing labels
and outgoing interface determined by the SID-List for FEC1.
Node A will generally also install an ingress MPLS forwarding entry
corresponding to FEC1 for
incoming prefix=192.0.2.80/32 pushing outgoing labels and using the
outgoing interface
determined by the SID-List for FEC1.

The rule in section 2.6 means that node A MUST NOT install an ingress MPLS
forwarding entry
corresponding to FEC2 ( which would be for incoming prefix=192.0.2.81/32).

========

General comment:

section 2.6 title:
existing:
Outgoing Label Collision:
proposed:
Effect of Incoming Label Collision on Outgoing Label Programming :
--------------------------------------


Thanks,
Chris


On Thu, May 24, 2018 at 12:14 PM, <bruno.decraene@orange.com> wrote:

> Hello Working Group,
>
>
>
> This email starts a Working Group Last Call on draft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and ready for a final working group review.
>
>
>
> Please read this document if you haven't read the most recent version yet, and send your comments to the list, no later than *June 08*.
>
>
>
> As a reminder, this document had already passed a WGLC more than a year ago on version -06 [2], had been sent to the AD but then returned to the WG.
>
> Since then, the document has significantly changed, so please read it again. In particular, it now includes the resolution in case of incoming label collision. Hence it killed draft-ietf-spring-conflict-resolution.
>
>
>
> Both co-chairs co-author this document, hence:
>
> - Shraddha has agreed to be the document shepherd.. Thank you Shraddha.
>
> - Martin, our AD, has agreed to evaluate the WG consensus.
>
>
>
> Thank you,
>
> Bruno, Rob
>
>
>
> [1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13
>
> [2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y
>
>
>
> _________________________________________________________________________________________________________________________
>
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> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
>
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--0000000000006a894a056e255efe
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">SPRING WG,<br><br>I generally support publication of<br>dr=
aft-ietf-spring-segment-routing-mpls. However, I think <br>that the text in=
 sections 2.5 and 2.6 (on incoming label collisions)<br>needs some work bef=
ore publication. This text was added to <br>the draft a few months ago, and=
 has not gotten much review<br>from the WG as a whole. The review and propo=
sed text below<br>focuses on these sections.<br><br>As I understand the cur=
rent text of the draft, the general<br>approach to resolving incoming label=
 collisions seems<br>well-reasoned and complete.=C2=A0 However, it is possi=
ble that <br>my interpretation of these tie-breaking rules is <br>not what =
the authors intended.<br><br>I&#39;d like to propose the examples below to =
be included<br>in the draft to help clarify the tie-breaking rules<br>for i=
ncoming label collisions described in section 2.5.<br>I have highlighted se=
veral cases in these examples,<br>where I think the rules in section 2.5 ne=
ed<br>to be clarified in order to unambiguously determine <br>the winning F=
EC in an example.<br><br>It may also be the case that the authors or other =
<br>WG participants will disagree with the interpretation of the <br>rules =
used to choose a winning FEC in some of these<br>examples.=C2=A0 In that ca=
se, we should discuss<br>what is the correct interpretation, and clarify th=
e <br>text in the draft to make the correct interpretation <br>clear.<br><b=
r><br>Incoming label collision examples<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br><=
br>Node A<br>OSPF default admin distance for implementation=3D50<br>ISIS de=
fault admin distance for implementation=3D60<br><br>=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<br>Example incoming label conflict for label=3D1005 on node A<br><br=
>FEC1)<br>OSPF prefix sid advertisement from node B for <a href=3D"http://1=
98.51.100.5/32">198.51.100.5/32</a> with index=3D5<br>OSPF SRGB on node A =
=3D [1000,1999]<br>Incoming label=3D1005<br><br>FEC2)<br>ISIS prefix sid ad=
vertisement from node C for <a href=3D"http://203.0.113.105/32">203.0.113.1=
05/32</a> with index=3D5<br>ISIS SRGB on node A =3D [1000,1999] <br>Incomin=
g label=3D1005<br><br>FEC1 and FEC2 both use dynamic SID assignment.=C2=A0 =
Since neither of <br>the FEC types is SR Policy, we use the default admin d=
istances of 50<br>and 60 to break the tie.=C2=A0 So FEC1 wins.<br><br>=3D=
=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D100=
6 on node A<br><br>FEC1)<br>OSPF prefix sid advertisement from node B for <=
a href=3D"http://198.51.100.6/32">198.51.100.6/32</a> with index=3D6<br>OSP=
F SRGB on node A =3D [1000,1999]<br>Incoming label=3D1006<br><br>FEC2)<br>I=
SIS adjacency sid advertisement from node A with label=3D1006<br>Incoming l=
abel=3D1006<br>Node A allocates this adjacency SID dynamically, <br>and it =
may differ across router reboots.<br><br>FEC1 and FEC2 both use dynamic SID=
 assignment.=C2=A0 Since neither of <br>the FEC types is SR Policy, we use =
the default admin distances of 50<br>and 60 to break the tie.=C2=A0 So FEC1=
 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflic=
t for label=3D1007 on node A<br><br>FEC1)<br>OSPF prefix sid advertisement =
from node B for <a href=3D"http://198.51.100.7/32">198.51.100.7/32</a> with=
 index=3D7<br>OSPF SRGB on node A =3D [1000,1999]<br>Incoming label=3D1007<=
br><br>FEC2)<br>ISIS adjacency sid advertisement from node A with label=3D1=
007<br>Incoming label=3D1007<br>Node A assigns this adjacency SID explicitl=
y via configuration, <br>so the adjacency SID survives router reboots.<br><=
br>FEC1 uses dynamic SID assignment, while FEC2 uses explicit SID <br>assig=
nment. So FEC2 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming=
 label conflict for label=3D1008 on node A<br><br>FEC1)<br>OSPF prefix sid =
advertisement from node B for <a href=3D"http://198.51.100.8/32">198.51.100=
.8/32</a> with index=3D8<br>OSPF SRGB on node A =3D [1000,1999]<br>Incoming=
 label=3D1008<br><br>FEC2)<br>SR Policy advertisement from controller to no=
de A<br>Endpoint =3D 192.0.2.208, color =3D 100, SID-List =3D &lt;S1, S2&gt=
;<br>Binding-SID label =3D 1008<br><br>FEC1 and FEC2 both use dynamic SID a=
ssignment.=C2=A0 <br>Since one of the FEC types is SR Policy, default admin=
<br>distance is not used to break the tie.=C2=A0 <br>/* The text in Section=
 2.5.1 needs to be clarified to specify<br>whether SR Policy always loses o=
r always wins in this case. */<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Exampl=
e incoming label conflict for label=3D1009 on node A<br><br>FEC1)<br>OSPF a=
djacency sid advertisement by node A with label=3D1009<br>Incoming label=3D=
1009<br>Node A assigns this adjacency SID explicitly via configuration, <br=
>so the adjacency SID survives router reboots.<br><br>FEC2)<br>ISIS adjacen=
cy sid advertisement by node A with label=3D1009<br>Incoming label=3D1009<b=
r>Node A assigns this adjacency SID explicitly via configuration, <br>so th=
e adjacency SID survives router reboots.<br><br>FEC1 and FEC2 both use expl=
icit SID assignment.=C2=A0 This kind of <br>incoming label collision should=
 never occur, since an <br>implement of explicit SID assignment MUST guaran=
tee<br>collision freeness on the same router.<br><br>=3D=3D=3D=3D=3D=3D=3D=
=3D<br>Example incoming label conflict for label=3D1010 on node A<br><br>FE=
C1)<br>ISIS prefix sid advertisement from node B for <a href=3D"http://203.=
0.113.110/32">203.0.113.110/32</a> with index=3D10<br>ISIS SRGB on node A =
=3D [1000,1999]<br>Incoming label=3D1010<br><br>FEC2)<br>ISIS adjacency sid=
 advertisement by node A with label=3D1010<br>Incoming label=3D1010<br>Node=
 A allocates this adjacency SID dynamically,<br>and it may differ across ro=
uter reboots.<br><br>FEC1 and FEC2 both use dynamic SID assignment. Since b=
oth FECs <br>are from the same MCC, they have the same default admin distan=
ce.<br>So we compare FEC type code-point.=C2=A0 FEC1 has FEC type <br>code-=
point=3D120, while FEC2 has FEC type code-point=3D130.<br>Therefore, FEC1 w=
ins.=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label co=
nflict for label=3D1011 on node A<br><br>FEC1)<br>ISIS prefix sid advertise=
ment from node B for <a href=3D"http://203.0.113.111/32">203.0.113.111/32</=
a> with index=3D11<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=
=3D1011<br><br>FEC2)<br>ISIS prefix sid advertisement from node C for 2001:=
DB8:1000::11/128 with index=3D11<br>ISIS SRGB on node A =3D [1000,1999]<br>=
Incoming label=3D1011<br><br>FEC1 and FEC2 both use dynamic SID assignment.=
 Since both FECs <br>are from the same MCC, they have the same default admi=
n distance.<br>So we compare FEC type code-point.=C2=A0 Both FECs have FEC =
type <br>code-point=3D120. So we compare address family.=C2=A0 Since IPv4 i=
s <br>preferred over IPv6, FEC1 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br=
>Example incoming label conflict for label=3D1012 on node A<br><br>FEC1)<br=
>ISIS prefix sid advertisement from node B for <a href=3D"http://203.0.113.=
112/32">203.0.113.112/32</a> with index=3D12<br>ISIS SRGB on node A =3D [10=
00,1999]<br>Incoming label=3D1012<br><br>FEC2)<br>ISIS prefix sid advertise=
ment from node C for <a href=3D"http://203.0.113.128/30">203.0.113.128/30</=
a> with index=3D12<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=
=3D1012<br><br>FEC1 and FEC2 both use dynamic SID assignment. Since both FE=
Cs <br>are from the same MCC, they have the same default admin distance.<br=
>So we compare FEC type code-point.=C2=A0 Both FECs have FEC type <br>code-=
point=3D120. So we compare address family.=C2=A0 Both are IPv4 address<br>f=
amily, so we compare prefix length.=C2=A0 FEC1 has prefix length=3D32, <br>=
and FEC2 has prefix length=3D30, so FEC2 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<br>Example incoming label conflict for label=3D1013 on node A<br><br=
>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D"http://2=
03.0.113.113/32">203.0.113.113/32</a> with index=3D13<br>ISIS SRGB on node =
A =3D [1000,1999]<br>Incoming label=3D1013<br><br>FEC2)<br>ISIS prefix sid =
advertisement from node C for <a href=3D"http://203.0.113.213/32">203.0.113=
.213/32</a> with index=3D13<br>ISIS SRGB on node A =3D [1000,1999]<br>Incom=
ing label=3D1013<br><br>FEC1 and FEC2 both use dynamic SID assignment. Sinc=
e both FECs <br>are from the same MCC, they have the same default admin dis=
tance.<br>So we compare FEC type code-point.=C2=A0 Both FECs have FEC type =
<br>code-point=3D120. So we compare address family.=C2=A0 Both are IPv4 add=
ress<br>family, so we compare prefix length.=C2=A0 Prefix lengths are the s=
ame,<br>so we compare prefix.=C2=A0 FEC1 has the lower prefix, so FEC1 wins=
.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for=
 label=3D1014 on node A<br><br>FEC1)<br>ISIS prefix sid advertisement from =
node B for <a href=3D"http://203.0.113.114/32">203.0.113.114/32</a> with in=
dex=3D14<br>Routing Instance ID =3D 1000<br>ISIS SRGB on node A =3D [1000,1=
999]<br>Incoming label=3D1014<br><br>FEC2)<br>ISIS prefix sid advertisement=
 from node C for <a href=3D"http://203.0.113.114/32">203.0.113.114/32</a> w=
ith index=3D14<br>Routing Instance ID =3D 2000<br>ISIS SRGB on node A =3D [=
1000,1999]<br>Incoming label=3D1014<br><br>These two FECs match all the way=
 through the prefix length and prefix. <br>So Routing Instance ID breaks th=
e tie, with FEC1 winning.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example inc=
oming label conflict for label=3D1015 on node A<br><br>FEC1)<br>ISIS prefix=
 sid advertisement from node B for <a href=3D"http://203.0.113.115/32">203.=
0.113.115/32</a> with index=3D15<br>Routing Instance ID =3D 1000<br>ISIS Mu=
lti-topology ID =3D 50<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming l=
abel=3D1015<br><br>FEC2)<br>ISIS prefix sid advertisement from node C for <=
a href=3D"http://203.0.113.115/32">203.0.113.115/32</a> with index=3D15<br>=
Routing Instance ID =3D 1000<br>ISIS Multi-topology ID =3D 40<br>ISIS SRGB =
on node A =3D [1000,1999]<br>Incoming label=3D1015<br><br>These two FECs ma=
tch all the way through the prefix length, prefix, and <br>Routing Instance=
 ID.=C2=A0 We compare ISIS Multi-topology ID, so FEC2 wins.<br><br>/* There=
 appears to be a typo in section 2.5.1, with two different <br>orderings sh=
own for a prefix-based FEC: <br>Prefix, Routing Instance, Topology, Algorit=
hm<br>and<br>(Prefix Length, Prefix, SR Algorithm, routing_instance_id, Top=
ology)<br>This needs to be corrected. */<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=
<br>Example incoming label conflict for label=3D1016 on node A<br><br>FEC1)=
<br>ISIS prefix sid advertisement from node B for <a href=3D"http://203.0.1=
13.116/32">203.0.113.116/32</a> with index=3D16<br>Routing Instance ID =3D =
1000<br>ISIS Multi-topology ID =3D 50<br>SR algorithm =3D 0<br>ISIS SRGB on=
 node A =3D [1000,1999]<br>Incoming label=3D1016<br><br>FEC2)<br>ISIS prefi=
x sid advertisement from node C for <a href=3D"http://203.0.113.116/32">203=
.0.113.116/32</a> with index=3D16<br>Routing Instance ID =3D 1000<br>ISIS M=
ulti-topology ID =3D 50<br>SR algorithm =3D 22<br>ISIS SRGB on node A =3D [=
1000,1999]<br>Incoming label=3D1016<br><br>These two FECs match all the way=
 through the prefix length, prefix, and <br>Routing Instance ID, and Multi-=
topology ID. We compare SR algorithm ID, so<br>FEC1 wins.<br><br>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1017 on n=
ode A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=
=3D"http://203.0.113.117/32">203.0.113.117/32</a> with index=3D17<br>ISIS S=
RGB on node A =3D [1000,1999]<br>Incoming label=3D1017<br><br>FEC2)<br>ISIS=
 mapping server advertisement (SID/Label Binding TLV) from node D:<br>Range=
=3D100, Prefix =3D <a href=3D"http://203.0.113.1/32">203.0.113.1/32</a><br>=
This mapping server advertisment generates 100 mappings, one of which <br>m=
aps <a href=3D"http://203.0.113.17/32">203.0.113.17/32</a> to index=3D17.<b=
r>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1017<br><br>The f=
act that FEC1 comes from a normal prefix sid advertisement and <br>FEC2 is =
generated from a mapping server advertisement is not <br>used as a tie-brea=
king parameter. Both FECs use dynamic SID assignment,<br>are from the same =
MCC, have the same FEC type code-point=3D120. Their prefix<br>lengths are t=
he same as well.=C2=A0 FEC2 wins based on lower numerical prefix value,<br>=
since 203.0.113.17 is less than 203.0.113.117.<br><br>=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<br>Example incoming label conflict for label=3D1018 on node A<br><br=
>FEC1)<br>ISIS IPv4 adjacency sid advertisement from node A with label=3D10=
18<br>corresponding to next-hop interface address=3D192.0.2.100, outgoing i=
nterface ID=3D5<br>Incoming label=3D1018<br>Node A allocates this adjacency=
 SID dynamically, <br>and it may differ across router reboots.<br><br>FEC2)=
<br>ISIS IPv6 adjacency sid advertisement from node A with label=3D1018<br>=
corresponding to 2001:DB8:2000::100/128, outgoing interface ID=3D6.<br>Inco=
ming label=3D1018<br>Node A allocates this adjacency SID dynamically, <br>a=
nd it may differ across router reboots.<br><br>Both FECs use dynamic SID as=
signment, are from the same MCC,<br>and have the same FEC type code-point=
=3D130.=C2=A0 FEC1 wins <br>because IPv4 address family is preferred over I=
Pv6.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict =
for label=3D1019 on node A<br><br>FEC1)<br>ISIS IPv4 adjacency sid advertis=
ement from node A with label=3D1019<br>corresponding to next-hop interface =
address=3D192.0.2.220, outgoing interface ID=3D7<br>Incoming label=3D1019<b=
r>Node A allocates this adjacency SID dynamically, <br>and it may differ ac=
ross router reboots.<br><br>FEC2)<br>ISIS IPv4 adjacency sid advertisement =
from node A with label=3D1019<br>corresponding to next-hop interface addres=
s=3D192.0.2.230, outgoing interface ID=3D8<br>Incoming label=3D1019<br>Node=
 A allocates this adjacency SID dynamically, <br>and it may differ across r=
outer reboots.<br><br>Both FECs use dynamic SID assignment, are from the sa=
me MCC,<br>and have the same FEC type code-point=3D130. Both FECs have to <=
br>same address family.=C2=A0 FEC1 wins based on having the lowest next-hop=
<br>interface address.=C2=A0 <br><br>/* It is not clear how to construct an=
 example that <br>would result in using the outgoing interface ID as a tie-=
breaker.<br>It would be useful to understand why this is and clarify <br>it=
 in the text. */<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label c=
onflict for label=3D1020 on node A<br><br>FEC1)<br>SR Policy advertisement =
from controller to node A<br>Endpoint address=3D2001:DB8:3000::100, color=
=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-SID label=3D1020<br><br>FEC2)<=
br>SR Policy advertisement from controller to node A<br>Endpoint address=3D=
192.0.2.60, color=3D100, SID-List=3D&lt;S3, S4&gt;<br>Binding-SID label=3D1=
020<br><br>The FECs match through the tie-breaks up to and including<br>hav=
ing the same FEC type code-point=3D140.<br>FEC2 wins based on IPv4 address =
family being preferred<br>over IPv6.=C2=A0=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<br>Example incoming label conflict for label=3D1021 on node A<br>=
<br>FEC1)<br>SR Policy advertisement from controller to node A<br>Endpoint =
address=3D192.0.2.70, color=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-SID=
 label=3D1021<br><br>FEC2)<br>SR Policy advertisement from controller to no=
de A<br>Endpoint address=3D192.0.2.71, color=3D100, SID-List=3D&lt;S3, S4&g=
t;<br>Binding-SID label=3D1021<br><br>The FECs match through the tie-breaks=
 up to and including<br>having the same address family. FEC1 wins by having=
 the <br>lower numerical endpoint address value.<br><br>=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<br><br>I&#39;d like to propose the examples below to be included<=
br>in the draft to help clarify section 2.6 <br>(currently entitled &quot;O=
utgoing Label Collision&quot;).<br><br><br>Examples of the Effect Incoming =
Label Collision on Outgoing Label Programming<br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<br><br>Example of effect of incoming label collision for label=3D=
1022<br>on outgoing label programming on node A<br><br>FEC1)<br>ISIS prefix=
 sid advertisement from node B for <a href=3D"http://203.0.113.122/32">203.=
0.113.122/32</a> with index=3D22<br>ISIS SRGB on node A =3D [1000,1999]<br>=
Incoming label=3D1022<br><br>FEC2)<br>ISIS prefix sid advertisement from no=
de C for <a href=3D"http://203.0.113.222/32">203.0.113.222/32</a> with inde=
x=3D22<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1022<br><=
br>FEC1 wins based on lowest numerical prefix value.=C2=A0 This means that =
node A<br>installs a transit MPLS forwarding entry to SWAP incoming label=
=3D1022, with outgoing label N, <br>and use outgoing interace I. N is deter=
mined by the index associated with FEC1 (index=3D22) and <br>the SRGB adver=
tised by the next-hop node on the shortest path to reach<br><a href=3D"http=
://203.0.113.122/32">203.0.113.122/32</a>. <br><br>Node A will generally al=
so install an ingress MPLS forwarding entry corresponding to FEC1 for <br>i=
ncoming prefix=3D<a href=3D"http://203.0.113.122/32">203.0.113.122/32</a> p=
ushing outgoing label N, and using outgoing interace I.<br><br>The rule in =
section 2.6 means that node A MUST NOT install an ingress MPLS forwarding e=
ntry <br>corresponding to FEC2 ( which would be for incoming prefix=3D<a hr=
ef=3D"http://203.0.113.222/32">203.0.113.222/32</a>).=C2=A0 <br>=3D=3D=3D=
=3D=3D=3D=3D=3D<br><br>Example of effect of incoming label collision for la=
bel=3D1023<br>on outgoing label programming on node A<br><br>FEC1)<br>SR Po=
licy advertisement from controller to node A<br>Endpoint address=3D192.0.2.=
80, color=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-SID label=3D1023<br><=
br>FEC2)<br>SR Policy advertisement from controller to node A<br>Endpoint a=
ddress=3D192.0.2.81, color=3D100, SID-List=3D&lt;S3, S4&gt;<br>Binding-SID =
label=3D1023<br><br>FEC1 wins by having the lower numerical endpoint addres=
s value. This means that node A<br>installs a transit MPLS forwarding entry=
 to SWAP incoming label=3D1023, with outgoing labels <br>and outgoing inter=
face determined by the SID-List for FEC1. <br>Node A will generally also in=
stall an ingress MPLS forwarding entry corresponding to FEC1 for <br>incomi=
ng prefix=3D<a href=3D"http://192.0.2.80/32">192.0.2.80/32</a> pushing outg=
oing labels and using the outgoing interface <br>determined by the SID-List=
 for FEC1. <br><br>The rule in section 2.6 means that node A MUST NOT insta=
ll an ingress MPLS forwarding entry <br>corresponding to FEC2 ( which would=
 be for incoming prefix=3D<a href=3D"http://192.0.2.81/32">192.0.2.81/32</a=
>).=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D<br><br>General comment:<br><br>s=
ection 2.6 title:<br>existing:<br>Outgoing Label Collision:<br>proposed:<br=
>Effect of Incoming Label Collision on Outgoing Label Programming :<br><div=
>--------------------------------------</div><div><br></div><div><br></div>=
<div>Thanks,</div><div>Chris<br></div><br><div class=3D"gmail_extra"><br><d=
iv class=3D"gmail_quote">On Thu, May 24, 2018 at 12:14 PM,  <span dir=3D"lt=
r">&lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno=
.decraene@orange.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex">





<div lang=3D"FR">
<div class=3D"gmail-m_-7987155459334438273WordSection1">
<pre><span lang=3D"EN-US">Hello Working Group,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-<wbr>routing-mpls-13 [1] which is considered mature=
 and ready for a final working group review.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven&#39;t read=
 the most recent version yet, and send your comments to the list, no later =
than *June 08*.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-<wbr>resolution.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<u>=
</u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
.. Thank you Shraddha.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Thank you,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">[1] <a href=3D"https://tools.ietf.org/html/draft-=
ietf-spring-segment-routing-mpls-13" target=3D"_blank">https://tools.ietf.o=
rg/html/<wbr>draft-ietf-spring-segment-<wbr>routing-mpls-13</a><u></u><u></=
u></span></pre>
<pre><span lang=3D"EN-US">[2] <a href=3D"https://mailarchive.ietf.org/arch/=
msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y" target=3D"_blank">https://mailarchi=
ve.ietf.org/<wbr>arch/msg/spring/<wbr>STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><u></u=
><u></u></span></pre>
<pre><span style=3D"font-family:&quot;Arial&quot;,&quot;sans-serif&quot;" l=
ang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
</div>
<pre>______________________________<wbr>______________________________<wbr>=
______________________________<wbr>______________________________<wbr>_

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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</pre></div>

<br>______________________________<wbr>_________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/spring</a><br=
>
<br></blockquote></div><br></div></div>

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From: Paul Mattes <pamattes@microsoft.com>
To: Robert Raszuk <robert@raszuk.net>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <Michael.McBride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>, Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 8 Jun 2018 21:48:25 +0200
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To: Paul Mattes <pamattes@microsoft.com>
Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>, Michael McBride <Michael.McBride@huawei.com>,  Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>,  Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
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=E2=80=8BThe below sentence I am going to frame next to the best quotes eve=
r ....
Thank you Paul !


We don=E2=80=99t have domain-wide labels. We have domain-wide indices. The =
same
> index is represented with different label values by different hosts,
> depending on their SRGBs.
>
>
>
>         *pdm*
>
>

--000000000000f452db056e26ae71
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_extra"><d=
iv class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;=
font-size:small">=E2=80=8BThe below sentence I am going to frame next to th=
e best quotes ever .... Thank you Paul !</div><br><div class=3D"gmail_quote=
"><br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-3665142918556382938WordSection1">
<p class=3D"MsoNormal">We don=E2=80=99t have domain-wide labels. We have do=
main-wide indices. The same index is represented with different label value=
s by different hosts, depending on their SRGBs.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <i>pdm</i=
></p><p class=3D"MsoNormal"><u></u></p></div></div></blockquote></div></div=
></div>

--000000000000f452db056e26ae71--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Robert Raszuk <robert@raszuk.net>, Paul Mattes <pamattes@microsoft.com>
CC: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <michael.mcbride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>, Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/RR1e-RytCJlcTTiLQ065jyBCCS0>
Subject: Re: [spring] Updating the SPRING WG Charter
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Robert, Paul and all,
I concur with Paul.
Domain-wide labels have been successfully purged from SR-MPLS for quite so=
me time now, and, from my POV this purge is irreversible now.

My 2c.

Thumb typed by Sasha Vainshtein

________________________________
From: Paul Mattes <pamattes@microsoft.com>
Sent: Friday, June 8, 2018 10:02:47 PM
To: Robert Raszuk; Alexander Vainshtein
Cc: spring@ietf.org; Xiejingrong; Michael McBride; Rob Shakir; Zafar Ali (=
zali); Eric C Rosen; Voyer, Daniel
Subject: RE: [spring] Updating the SPRING WG Charter

We don=92t have domain-wide labels. We have domain-wide indices. The same =
index is represented with different label values by different hosts, depen=
ding on their SRGBs.

        pdm

From: spring <spring-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Friday, June 8, 2018 9:59 AM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: spring@ietf.org; Xiejingrong <xiejingrong@huawei.com>; Michael McBride=
 <Michael.McBride@huawei.com>; Rob Shakir <robjs=3D40google.com@dmarc.ietf=
.org>; Zafar Ali (zali) <zali@cisco.com>; Eric C Rosen <erosen@juniper.net=
>; Voyer, Daniel <daniel.voyer@bell.ca>
Subject: Re: [spring] Updating the SPRING WG Charter

Sasha,

> because usage of domain-wide labels has been discussed many times in the=
 past and rejected by the MPLS WG.

That comment I quite do not follow. Entire concept of SR-MPLS  is based on=
 domain wide labels (distributed via IGP or OOB) and my description applie=
s to SR based networks with both MPLS as well as v6 encap.

In other words we already have domain wide MPLS labels to indicate various=
 types of segments. What I proposed would at most require perhaps new type=
 which would embed node + replication function..

Thx,
R.


On Fri, Jun 8, 2018 at 4:53 PM, Alexander Vainshtein <Alexander.Vainshtein=
@ecitele.com<mailto:Alexander.Vainshtein@ecitele.com>> wrote:
Robert,
I concur with Eric.

I also think that the scenarios you describe as relevant for SR-fan-out/SR=
-spray (=93applications which on one side do not really require full multi=
cast yet they would benefit with content to be send once from server and a=
rrived at two or more caches=94) strongly resembles IGMP/MLD Proxy applica=
tions (RFC 4605<https://na01.safelinks.protection.outlook.com/?url=3Dhttps=
%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc4605&data=3D02%7C01%7Cpamattes%40micro=
soft.com%7C555c978a313441d9e0f508d5cd506e42%7C72f988bf86f141af91ab2d7cd011=
db47%7C1%7C0%7C636640667691087492&sdata=3DI1uK8l1aISD61f8E%2BH2Mt10v8RQ1W%=
2Bh2bS4pl%2BB%2BgOw%3D&reserved=3D0>). Is such an analogy correct?

Last but not least, it seems that your description of SR-fan-out mandates =
usage of domain-wide labels (mentioned by Eric as well_. If this is indeed=
 so, I consider this as a stopper because usage of domain-wide labels has =
been discussed many times in the past and rejected by the MPLS WG.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>

From: rraszuk@gmail.com<mailto:rraszuk@gmail.com> [mailto:rraszuk@gmail.co=
m<mailto:rraszuk@gmail.com>] On Behalf Of Robert Raszuk
Sent: Thursday, June 7, 2018 7:04 PM
To: Eric C Rosen <erosen@juniper.net<mailto:erosen@juniper.net>>
Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexande=
r.Vainshtein@ecitele.com>>; spring@ietf.org<mailto:spring@ietf.org>; Xieji=
ngrong <xiejingrong@huawei.com<mailto:xiejingrong@huawei.com>>; Michael Mc=
Bride <Michael.McBride@huawei.com<mailto:Michael.McBride@huawei.com>>; Rob=
 Shakir <robjs=3D40google.com@dmarc.ietf.org<mailto:40google.com@dmarc.iet=
f.org>>; Zafar Ali (zali) <zali@cisco.com<mailto:zali@cisco.com>>; Voyer, =
Daniel <daniel.voyer@bell.ca<mailto:daniel.voyer@bell.ca>>
Subject: Re: [spring] Updating the SPRING WG Charter

Hi Eric,

The way I look at this is really not from the perspective of true dynamic =
multicast with tree building etc .. .I look at this as anchor points to re=
plicate unicast flows into two or more endpoints maybe once or twice in en=
tire domain.

So for sure if you would try to apply this technique to distribute traditi=
onal multicast there is tons of things which can go wrong and you are bett=
er off with BIER.

But there are applications which on one side do not really require full mu=
lticast yet they would benefit with content to be send once from server an=
d arrived at two or more caches. Maybe we just don't have the right name f=
or it in networking yet :)

Cheers,
R.


On Thu, Jun 7, 2018 at 5:52 PM, Eric C Rosen <erosen@juniper.net<mailto:er=
osen@juniper.net>> wrote:
On 6/7/2018 10:55 AM, Robert Raszuk wrote:
Imagine a segment with embedded meaning that packets received with such va=
lue X should be replicated to interfaces  Y & Z. Such decision can be conf=
igured from controller or locally computed.

Nothing there is per-path as well as nothing there is per flow or per mult=
icast group. It is a local function.

How can you say "nothing there per-path"?  The label X represents a multic=
ast tree, and thus constitutes per-path state.    If some packets need to =
go to Y and Z, some need to go to Y, Z, and W, some need to go to Y, U, an=
d V, etc., you obviously need a different label for each different multica=
st tree, and appropriate per-tree state.

Using a controller to set up multicast paths may be a good idea in some sc=
enarios, but let's not pretend it doesn't create per-path state in the rou=
ter.  Per-path (per-tree) is not the same as per-flow or per-group, of cou=
rse, but that's true of any technique that aggregates flows into multicast=
 tunnels.

Note also that if the label X is domain-wide unique and there is no RPF ch=
eck, there is the possibility of nasty multicast loops.  These is some dis=
cussion of this in draft-zzhang-bess-bgp-multicast-controller-00.



__________________________________________________________________________=
_

This e-mail message is intended for the recipient only and contains inform=
ation which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original
and all copies thereof.
__________________________________________________________________________=
_


__________________________________________________________________________=
_

This e-mail message is intended for the recipient only and contains inform=
ation which is=20
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this=20
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original=20
and all copies thereof.
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--_000_DB5PR0301MB19091032724ED7EDC11F63659D7B0DB5PR0301MB1909_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-=
1252">
<meta content=3D"text/html; charset=3Dutf-8">
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)">
<style>
<!--
@font-face
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</style>
</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Robert, Paul and all,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
I concur with Paul. <br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Domain-wide labels have been successfully purged from SR-MPLS for quite so=
me time now, and, from my POV this purge is irreversible now.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
My 2c.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Thumb typed by Sasha Vainshtein</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" c=
olor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Paul Mattes &lt;pam=
attes@microsoft.com&gt;<br>
<b>Sent:</b> Friday, June 8, 2018 10:02:47 PM<br>
<b>To:</b> Robert Raszuk; Alexander Vainshtein<br>
<b>Cc:</b> spring@ietf.org; Xiejingrong; Michael McBride; Rob Shakir; Zafa=
r Ali (zali); Eric C Rosen; Voyer, Daniel<br>
<b>Subject:</b> RE: [spring] Updating the SPRING WG Charter</font>
<div>&nbsp;</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal">We don=92t have domain-wide labels. We have domain-=
wide indices. The same index is represented with different label values by=
 different hosts, depending on their SRGBs.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <i>pdm</=
i></p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt;=
 <b>On Behalf Of
</b>Robert Raszuk<br>
<b>Sent:</b> Friday, June 8, 2018 9:59 AM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;<b=
r>
<b>Cc:</b> spring@ietf.org; Xiejingrong &lt;xiejingrong@huawei.com&gt;; Mi=
chael McBride &lt;Michael.McBride@huawei.com&gt;; Rob Shakir &lt;robjs=3D4=
0google.com@dmarc.ietf.org&gt;; Zafar Ali (zali) &lt;zali@cisco.com&gt;; E=
ric C Rosen &lt;erosen@juniper.net&gt;; Voyer, Daniel &lt;daniel.voyer@bel=
l.ca&gt;<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter</p>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">Sasha,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D; background:white">&gt=
; because usage of domain-wide labels has been discussed many times in the=
 past and rejected by the MPLS WG.</span><span style=3D"font-size:12.0pt; =
font-family:&quot;Arial&quot;,sans-serif">
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">That comment I quite do not follow. Entire concept=
 of SR-MPLS&nbsp; is based on domain wide labels (distributed via IGP or O=
OB) and my description applies to SR based networks with
 both MPLS as well as v6 encap.&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">In other words we already have domain wide MPLS la=
bels to indicate various types of segments. What I proposed would at most =
require perhaps new type which would embed node &#43;
 replication function..&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">Thx,<br>
R.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<p class=3D"MsoNormal">On Fri, Jun 8, 2018 at 4:53 PM, Alexander Vainshtei=
n &lt;<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank=
">Alexander.Vainshtein@ecitele.com</a>&gt; wrote:</p>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding=
:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Robert,</s=
pan></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">I concur w=
ith Eric.</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">I also thi=
nk that the scenarios you describe as relevant for SR-fan-out/SR-spray (=93=
</span><span style=3D"font-family:&quot;Arial&quot;,sans-serif; background=
:yellow">applications which on one side do not really
 require full multicast yet they would benefit with content to be send onc=
e from server and arrived at two or more caches</span><span style=3D"color=
:#1F497D">=94) strongly resembles IGMP/MLD Proxy applications (<a href=3D"=
https://na01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Frfc4605&amp;data=3D02%7C01%7Cpamattes%40microsoft.com%7C5=
55c978a313441d9e0f508d5cd506e42%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0=
%7C636640667691087492&amp;sdata=3DI1uK8l1aISD61f8E%2BH2Mt10v8RQ1W%2Bh2bS4p=
l%2BB%2BgOw%3D&amp;reserved=3D0" target=3D"_blank">RFC
 4605</a>). Is such an analogy correct?</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Last but n=
ot least, it seems that your description of SR-fan-out mandates usage of d=
omain-wide labels (mentioned by Eric as well_. If this is indeed so, I con=
sider this as a stopper because usage of
 domain-wide labels has been discussed many times in the past and rejected=
 by the MPLS WG.</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Regards,</=
span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Sasha</spa=
n></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Office: &#=
43;972-39266302</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Cell:&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302</span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">Email:&nbs=
p;&nbsp; <a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_bl=
ank">
Alexander.Vainshtein@ecitele.com</a></span></p>
<p class=3D"MsoNormal" style=3D""><span style=3D"color:#1F497D">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal" style=3D""><b>From:</b> <a href=3D"mailto:rraszuk@g=
mail.com" target=3D"_blank">
rraszuk@gmail.com</a> [mailto:<a href=3D"mailto:rraszuk@gmail.com" target=3D=
"_blank">rraszuk@gmail.com</a>]
<b>On Behalf Of </b>Robert Raszuk<br>
<b>Sent:</b> Thursday, June 7, 2018 7:04 PM<br>
<b>To:</b> Eric C Rosen &lt;<a href=3D"mailto:erosen@juniper.net" target=3D=
"_blank">erosen@juniper.net</a>&gt;<br>
<b>Cc:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>; =
Xiejingrong &lt;<a href=3D"mailto:xiejingrong@huawei.com" target=3D"_blank=
">xiejingrong@huawei.com</a>&gt;; Michael McBride &lt;<a href=3D"mailto:Mi=
chael.McBride@huawei.com" target=3D"_blank">Michael.McBride@huawei.com</a>=
&gt;;
 Rob Shakir &lt;robjs=3D<a href=3D"mailto:40google.com@dmarc.ietf.org" tar=
get=3D"_blank">40google.com@dmarc.ietf.org</a>&gt;; Zafar Ali (zali) &lt;<=
a href=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</a>&gt;;=
 Voyer, Daniel &lt;<a href=3D"mailto:daniel.voyer@bell.ca" target=3D"_blan=
k">daniel.voyer@bell.ca</a>&gt;<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter</p>
<p class=3D"MsoNormal" style=3D"">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">Hi Eric,</span></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">The way I look at this is really not from the perspective=
 of true dynamic multicast with tree building etc .. .I look at this as an=
chor points to replicate unicast flows into two or
 more endpoints maybe once or twice in entire domain.&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">So for sure if you would try to apply this technique to d=
istribute traditional multicast there is tons of things which can go wrong=
 and you are better off with BIER.&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">But there are applications which on one side do not reall=
y require full multicast yet they would benefit with content to be send on=
ce from server and arrived at two or more caches. Maybe
 we just don't have the right name for it in networking yet :)&nbsp;</span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">Cheers,<br>
R.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"">&nbsp;</p>
<div>
<p class=3D"MsoNormal" style=3D"">On Thu, Jun 7, 2018 at 5:52 PM, Eric C R=
osen &lt;<a href=3D"mailto:erosen@juniper.net" target=3D"_blank">erosen@ju=
niper.net</a>&gt; wrote:</p>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding=
:0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in;=
 margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">On 6/7/2018 10:55 AM=
, Robert Raszuk wrote:</p>
<blockquote style=3D"margin-top:5.0pt; margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">Imagine a segment with embedded meaning that packets rece=
ived with such value X should be replicated to interfaces&nbsp; Y &amp; Z.=
 Such decision can be configured from controller or locally
 computed.&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D""><span style=3D"font-family:&quot;Arial&q=
uot;,sans-serif">Nothing there is per-path=20as well as nothing there is p=
er flow or per multicast group. It is a local function.&nbsp;</span></p>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
How can you say &quot;nothing there per-path&quot;?&nbsp; The label X repr=
esents a multicast tree, and thus constitutes per-path state.&nbsp;&nbsp;&=
nbsp; If some packets need to go to Y and Z, some need to go to Y, Z, and =
W, some need to go to Y, U, and V, etc., you obviously need a different
 label for each different multicast tree, and appropriate per-tree state.&=
nbsp; <br>
<br>
Using a controller to set up multicast paths may be a good idea in some sc=
enarios, but let's not pretend it doesn't create per-path state in the rou=
ter.&nbsp; Per-path (per-tree) is not the same as per-flow or per-group, o=
f course, but that's true of any technique
 that aggregates flows into multicast tunnels.<br>
<br>
Note also that if the label X is domain-wide unique and there is no RPF ch=
eck, there is the possibility of nasty multicast loops.&nbsp; These is som=
e discussion of this in draft-zzhang-bess-bgp-multicast-controller-00.<br>=

<br>
</p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"">&nbsp;</p>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
ation which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
<br>
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original
<br>
and all copies thereof.<br>
__________________________________________________________________________=
_</p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
</div>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this <BR>
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original <BR>
and all copies thereof.<BR>
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--_000_DB5PR0301MB19091032724ED7EDC11F63659D7B0DB5PR0301MB1909_--


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From: "Voyer, Daniel" <daniel.voyer@bell.ca>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>, Michael McBride <Michael.McBride@huawei.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Fri, 8 Jun 2018 20:23:35 +0000
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References: <8CCB28152EA2E14A96BBEDC15823481A1CB79F12@sjceml521-mbs.china.huawei.com> <16253F7987E4F346823E305D08F9115A99A7D4CE@nkgeml514-mbx.china.huawei.com> <CAHd-QWvx-tkP1Asx3PwM3p2=wjuJm7b=A4Hb-BUnCMRzwT1J8w@mail.gmail.com> <8CCB28152EA2E14A96BBEDC15823481A1CB7FBFE@sjceml521-mbs.china.huawei.com> <CAHd-QWu+184A3Nje_Bmki9A3wwpp=4YyyKTTkWBtLcf_gt7Lvg@mail.gmail.com> <75252B5F-6BCB-4166-ACC1-C9E9697B7B68@cisco.com> <CAHd-QWua7ZiVXK2bcCdf84rm=ha0cSd+7LtPytVWDWd2BzE9RA@mail.gmail.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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--_000_5FD7D3B425B04A0C8AC9FC4DF7F7D853bellca_--


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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 8 Jun 2018 22:43:40 +0200
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Cc: Paul Mattes <pamattes@microsoft.com>, "spring@ietf.org" <spring@ietf.org>,  Xiejingrong <xiejingrong@huawei.com>, Michael McBride <michael.mcbride@huawei.com>,  Rob Shakir <robjs=40google.com@dmarc.ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>,  Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
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--0000000000008ee6a5056e277446
Content-Type: text/plain; charset="UTF-8"

Folks,

The only reason why SR-MPLS architecture is using indexes as opposed to
domain wide labels is a claim from few folks that possibly in some networks
deployed platforms would not be able to use the same global label block for
SR.

So SR-MPLS architecture agreed to use index to offset possible per platform
label block.

That said number of real deployment do use global (domain wide) identical
block on all nodes and that is the actual recommendation from section 3.1.2
of SR architecture

"Where possible, it is recommended that identical SRGBs be configured on
all nodes in an SR Domain."

But none of this really matters for the discussion at hand. Embedding
instruction for specific function can be easily done within programmed
domain wide index offset.

Best,
R.


On Fri, Jun 8, 2018 at 10:21 PM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Robert, Paul and all,
> I concur with Paul.
> Domain-wide labels have been successfully purged from SR-MPLS for quite
> some time now, and, from my POV this purge is irreversible now.
>
> My 2c.
>
> Thumb typed by Sasha Vainshtein
>

--0000000000008ee6a5056e277446
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Folks,</div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small">The only reason why SR-MPLS architecture is using inde=
xes as opposed to domain wide labels is a claim from few folks that possibl=
y in some networks deployed platforms would not be able to use the same glo=
bal label block for SR.=C2=A0</div><div class=3D"gmail_default" style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">So SR-MPLS architecture agreed to use index to offset possible per=
 platform label block.=C2=A0</div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">That said number of real deployment do use global (domain wide) id=
entical block on all nodes and that is the actual recommendation from secti=
on 3.1.2 of SR architecture</div><div class=3D"gmail_default" style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:s=
mall"><div class=3D"gmail_default">&quot;Where possible, it is recommended =
that identical SRGBs be configured on all nodes in an SR Domain.&quot;</div=
></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small">But none of this rea=
lly matters for the discussion at hand. Embedding instruction for specific =
function can be easily done within programmed domain wide index offset.=C2=
=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,=
sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D=
"font-family:arial,helvetica,sans-serif;font-size:small">Best,<br>R.</div><=
div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif=
;font-size:small"><br></div><div class=3D"gmail_extra"><br><div class=3D"gm=
ail_quote">On Fri, Jun 8, 2018 at 10:21 PM, Alexander Vainshtein <span dir=
=3D"ltr">&lt;<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"=
_blank">Alexander.Vainshtein@ecitele.com</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex">






<div lang=3D"EN-US">
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
Robert, Paul and all,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
I concur with Paul. <br>
</div>
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
Domain-wide labels have been successfully purged from SR-MPLS for quite som=
e time now, and, from my POV this purge is irreversible now.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
My 2c.<br>
<br>
</div><span class=3D"gmail-">
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
<div dir=3D"auto" style=3D"direction:ltr;margin:0px;padding:0px;font-family=
:sans-serif;font-size:11pt;color:black">
Thumb typed by Sasha Vainshtein</div></div></span></div></blockquote><div><=
br></div><div><br></div></div></div></div>

--0000000000008ee6a5056e277446--


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From: Przemyslaw Krol <pkrol@google.com>
Date: Sat, 9 Jun 2018 00:01:01 -0700
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To: spring@ietf.org
Cc: Bruno Decraene <bruno.decraene@orange.com>,  draft-ietf-spring-segment-routing-mpls@ietf.org, chrisbowers.ietf@gmail.com
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Greetings,

Few minor, cosmetic/editorial suggestions:

2.5. Incoming Label Collision
[...]
*(Endpoint, Color)* representing an SR policy [I.D. filsfils-spring-
segment-routing-policy]

(Color, Endpoint) is the ordering used by the policy draft. If the decision
is to correct it, there is few references in the draft

2.5.1. Tie-breaking Rules
[...]
       o The Color ID is encoded using *16 bits*

should be 32 bits
(https://tools.ietf.org/html/rfc5512#section-4.3.1 &&
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-00#section-2.1
)


2.6. Outgoing Label Collision
[...]
In the general case, the ingress node may not have exactly *have* the same
data of the receiving node

2.7. PUSH, CONTINUE, and NEXT
PUSH, NEXT, and CONTINUE are operations applied by the forwarding plan*e*.
[...]

2.8. MPLS Label downloaded to FIB corresponding to Global and Local SIDs
[...]
an IGP with SR extensions *[*I-D.ietf-isis-segment-routing-extensions,
I-D.ietf-ospf-segment-routing-extensions]

^^^ missing '[' or alternatively both references should be enclosed in
their own []


thanks,
pk

On Fri, Jun 8, 2018 at 11:14 AM Chris Bowers <chrisbowers.ietf@gmail.com>
wrote:

> SPRING WG,
>
> I generally support publication of
> draft-ietf-spring-segment-routing-mpls. However, I think
> that the text in sections 2.5 and 2.6 (on incoming label collisions)
> needs some work before publication. This text was added to
> the draft a few months ago, and has not gotten much review
> from the WG as a whole. The review and proposed text below
> focuses on these sections.
>
> As I understand the current text of the draft, the general
> approach to resolving incoming label collisions seems
> well-reasoned and complete.  However, it is possible that
> my interpretation of these tie-breaking rules is
> not what the authors intended.
>
> I'd like to propose the examples below to be included
> in the draft to help clarify the tie-breaking rules
> for incoming label collisions described in section 2.5.
> I have highlighted several cases in these examples,
> where I think the rules in section 2.5 need
> to be clarified in order to unambiguously determine
> the winning FEC in an example.
>
> It may also be the case that the authors or other
> WG participants will disagree with the interpretation of the
> rules used to choose a winning FEC in some of these
> examples.  In that case, we should discuss
> what is the correct interpretation, and clarify the
> text in the draft to make the correct interpretation
> clear.
>
>
> Incoming label collision examples
> =========
>
> Node A
> OSPF default admin distance for implementation=50
> ISIS default admin distance for implementation=60
>
> =========
> Example incoming label conflict for label=1005 on node A
>
> FEC1)
> OSPF prefix sid advertisement from node B for 198.51.100.5/32 with index=5
> OSPF SRGB on node A = [1000,1999]
> Incoming label=1005
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113.105/32 with
> index=5
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1005
>
> FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
> the FEC types is SR Policy, we use the default admin distances of 50
> and 60 to break the tie.  So FEC1 wins.
>
> =========
> Example incoming label conflict for label=1006 on node A
>
> FEC1)
> OSPF prefix sid advertisement from node B for 198.51.100.6/32 with index=6
> OSPF SRGB on node A = [1000,1999]
> Incoming label=1006
>
> FEC2)
> ISIS adjacency sid advertisement from node A with label=1006
> Incoming label=1006
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
> the FEC types is SR Policy, we use the default admin distances of 50
> and 60 to break the tie.  So FEC1 wins.
>
> =========
> Example incoming label conflict for label=1007 on node A
>
> FEC1)
> OSPF prefix sid advertisement from node B for 198.51.100.7/32 with index=7
> OSPF SRGB on node A = [1000,1999]
> Incoming label=1007
>
> FEC2)
> ISIS adjacency sid advertisement from node A with label=1007
> Incoming label=1007
> Node A assigns this adjacency SID explicitly via configuration,
> so the adjacency SID survives router reboots.
>
> FEC1 uses dynamic SID assignment, while FEC2 uses explicit SID
> assignment. So FEC2 wins.
>
> =========
> Example incoming label conflict for label=1008 on node A
>
> FEC1)
> OSPF prefix sid advertisement from node B for 198.51.100..8/32
> <http://198.51.100.8/32> with index=8
> OSPF SRGB on node A = [1000,1999]
> Incoming label=1008
>
> FEC2)
> SR Policy advertisement from controller to node A
> Endpoint = 192.0.2.208, color = 100, SID-List = <S1, S2>
> Binding-SID label = 1008
>
> FEC1 and FEC2 both use dynamic SID assignment.
> Since one of the FEC types is SR Policy, default admin
> distance is not used to break the tie.
> /* The text in Section 2.5.1 needs to be clarified to specify
> whether SR Policy always loses or always wins in this case. */
>
> =========
> Example incoming label conflict for label=1009 on node A
>
> FEC1)
> OSPF adjacency sid advertisement by node A with label=1009
> Incoming label=1009
> Node A assigns this adjacency SID explicitly via configuration,
> so the adjacency SID survives router reboots.
>
> FEC2)
> ISIS adjacency sid advertisement by node A with label=1009
> Incoming label=1009
> Node A assigns this adjacency SID explicitly via configuration,
> so the adjacency SID survives router reboots.
>
> FEC1 and FEC2 both use explicit SID assignment.  This kind of
> incoming label collision should never occur, since an
> implement of explicit SID assignment MUST guarantee
> collision freeness on the same router.
>
> ========
> Example incoming label conflict for label=1010 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.110/32 with
> index=10
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1010
>
> FEC2)
> ISIS adjacency sid advertisement by node A with label=1010
> Incoming label=1010
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
> are from the same MCC, they have the same default admin distance.
> So we compare FEC type code-point.  FEC1 has FEC type
> code-point=120, while FEC2 has FEC type code-point=130.
> Therefore, FEC1 wins.
>
> =========
> Example incoming label conflict for label=1011 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.111/32 with
> index=11
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1011
>
> FEC2)
> ISIS prefix sid advertisement from node C for 2001:DB8:1000::11/128 with
> index=11
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1011
>
> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
> are from the same MCC, they have the same default admin distance.
> So we compare FEC type code-point.  Both FECs have FEC type
> code-point=120. So we compare address family.  Since IPv4 is
> preferred over IPv6, FEC1 wins.
>
> =========
> Example incoming label conflict for label=1012 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.112/32 with
> index=12
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1012
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113.128/30 with
> index=12
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1012
>
> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
> are from the same MCC, they have the same default admin distance.
> So we compare FEC type code-point.  Both FECs have FEC type
> code-point=120. So we compare address family.  Both are IPv4 address
> family, so we compare prefix length.  FEC1 has prefix length=32,
> and FEC2 has prefix length=30, so FEC2 wins.
>
> =========
> Example incoming label conflict for label=1013 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.113/32 with
> index=13
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1013
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113..213/32
> <http://203.0.113.213/32> with index=13
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1013
>
> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
> are from the same MCC, they have the same default admin distance.
> So we compare FEC type code-point.  Both FECs have FEC type
> code-point=120. So we compare address family.  Both are IPv4 address
> family, so we compare prefix length.  Prefix lengths are the same,
> so we compare prefix.  FEC1 has the lower prefix, so FEC1 wins..
>
> =========
> Example incoming label conflict for label=1014 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.114/32 with
> index=14
> Routing Instance ID = 1000
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1014
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113.114/32 with
> index=14
> Routing Instance ID = 2000
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1014
>
> These two FECs match all the way through the prefix length and prefix.
> So Routing Instance ID breaks the tie, with FEC1 winning.
>
> =========
> Example incoming label conflict for label=1015 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.115/32 with
> index=15
> Routing Instance ID = 1000
> ISIS Multi-topology ID = 50
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1015
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113.115/32 with
> index=15
> Routing Instance ID = 1000
> ISIS Multi-topology ID = 40
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1015
>
> These two FECs match all the way through the prefix length, prefix, and
> Routing Instance ID.  We compare ISIS Multi-topology ID, so FEC2 wins.
>
> /* There appears to be a typo in section 2.5.1, with two different
> orderings shown for a prefix-based FEC:
> Prefix, Routing Instance, Topology, Algorithm
> and
> (Prefix Length, Prefix, SR Algorithm, routing_instance_id, Topology)
> This needs to be corrected. */
>
> =========
> Example incoming label conflict for label=1016 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.116/32 with
> index=16
> Routing Instance ID = 1000
> ISIS Multi-topology ID = 50
> SR algorithm = 0
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1016
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203..0.113.116/32
> <http://203.0.113.116/32> with index=16
> Routing Instance ID = 1000
> ISIS Multi-topology ID = 50
> SR algorithm = 22
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1016
>
> These two FECs match all the way through the prefix length, prefix, and
> Routing Instance ID, and Multi-topology ID. We compare SR algorithm ID, so
> FEC1 wins.
>
> =========
> Example incoming label conflict for label=1017 on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.117/32 with
> index=17
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1017
>
> FEC2)
> ISIS mapping server advertisement (SID/Label Binding TLV) from node D:
> Range=100, Prefix = 203.0.113.1/32
> This mapping server advertisment generates 100 mappings, one of which
> maps 203.0.113.17/32 to index=17.
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1017
>
> The fact that FEC1 comes from a normal prefix sid advertisement and
> FEC2 is generated from a mapping server advertisement is not
> used as a tie-breaking parameter. Both FECs use dynamic SID assignment,
> are from the same MCC, have the same FEC type code-point=120. Their prefix
> lengths are the same as well.  FEC2 wins based on lower numerical prefix
> value,
> since 203.0.113.17 is less than 203.0.113.117.
>
> =========
> Example incoming label conflict for label=1018 on node A
>
> FEC1)
> ISIS IPv4 adjacency sid advertisement from node A with label=1018
> corresponding to next-hop interface address=192.0.2.100, outgoing
> interface ID=5
> Incoming label=1018
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> FEC2)
> ISIS IPv6 adjacency sid advertisement from node A with label=1018
> corresponding to 2001:DB8:2000::100/128, outgoing interface ID=6.
> Incoming label=1018
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> Both FECs use dynamic SID assignment, are from the same MCC,
> and have the same FEC type code-point=130.  FEC1 wins
> because IPv4 address family is preferred over IPv6.
>
> =========
> Example incoming label conflict for label=1019 on node A
>
> FEC1)
> ISIS IPv4 adjacency sid advertisement from node A with label=1019
> corresponding to next-hop interface address=192.0.2.220, outgoing
> interface ID=7
> Incoming label=1019
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> FEC2)
> ISIS IPv4 adjacency sid advertisement from node A with label=1019
> corresponding to next-hop interface address=192.0.2.230, outgoing
> interface ID=8
> Incoming label=1019
> Node A allocates this adjacency SID dynamically,
> and it may differ across router reboots.
>
> Both FECs use dynamic SID assignment, are from the same MCC,
> and have the same FEC type code-point=130. Both FECs have to
> same address family.  FEC1 wins based on having the lowest next-hop
> interface address.
>
> /* It is not clear how to construct an example that
> would result in using the outgoing interface ID as a tie-breaker.
> It would be useful to understand why this is and clarify
> it in the text. */
> =========
> Example incoming label conflict for label=1020 on node A
>
> FEC1)
> SR Policy advertisement from controller to node A
> Endpoint address=2001:DB8:3000::100, color=100, SID-List=<S1, S2>
> Binding-SID label=1020
>
> FEC2)
> SR Policy advertisement from controller to node A
> Endpoint address=192.0.2.60, color=100, SID-List=<S3, S4>
> Binding-SID label=1020
>
> The FECs match through the tie-breaks up to and including
> having the same FEC type code-point=140.
> FEC2 wins based on IPv4 address family being preferred
> over IPv6.
>
> =========
> Example incoming label conflict for label=1021 on node A
>
> FEC1)
> SR Policy advertisement from controller to node A
> Endpoint address=192.0.2.70, color=100, SID-List=<S1, S2>
> Binding-SID label=1021
>
> FEC2)
> SR Policy advertisement from controller to node A
> Endpoint address=192.0.2.71, color=100, SID-List=<S3, S4>
> Binding-SID label=1021
>
> The FECs match through the tie-breaks up to and including
> having the same address family. FEC1 wins by having the
> lower numerical endpoint address value.
>
> =========
>
> I'd like to propose the examples below to be included
> in the draft to help clarify section 2.6
> (currently entitled "Outgoing Label Collision").
>
>
> Examples of the Effect Incoming Label Collision on Outgoing Label
> Programming
> ====================================
>
> Example of effect of incoming label collision for label=1022
> on outgoing label programming on node A
>
> FEC1)
> ISIS prefix sid advertisement from node B for 203.0.113.122/32 with
> index=22
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1022
>
> FEC2)
> ISIS prefix sid advertisement from node C for 203.0.113.222/32 with
> index=22
> ISIS SRGB on node A = [1000,1999]
> Incoming label=1022
>
> FEC1 wins based on lowest numerical prefix value.  This means that node A
> installs a transit MPLS forwarding entry to SWAP incoming label=1022, with
> outgoing label N,
> and use outgoing interace I. N is determined by the index associated with
> FEC1 (index=22) and
> the SRGB advertised by the next-hop node on the shortest path to reach
> 203.0.113.122/32.
>
> Node A will generally also install an ingress MPLS forwarding entry
> corresponding to FEC1 for
> incoming prefix=203.0.113.122/32 pushing outgoing label N, and using
> outgoing interace I.
>
> The rule in section 2.6 means that node A MUST NOT install an ingress MPLS
> forwarding entry
> corresponding to FEC2 ( which would be for incoming prefix=
> 203.0.113.222/32).
> ========
>
> Example of effect of incoming label collision for label=1023
> on outgoing label programming on node A
>
> FEC1)
> SR Policy advertisement from controller to node A
> Endpoint address=192.0.2.80, color=100, SID-List=<S1, S2>
> Binding-SID label=1023
>
> FEC2)
> SR Policy advertisement from controller to node A
> Endpoint address=192.0.2.81, color=100, SID-List=<S3, S4>
> Binding-SID label=1023
>
> FEC1 wins by having the lower numerical endpoint address value. This means
> that node A
> installs a transit MPLS forwarding entry to SWAP incoming label=1023, with
> outgoing labels
> and outgoing interface determined by the SID-List for FEC1.
> Node A will generally also install an ingress MPLS forwarding entry
> corresponding to FEC1 for
> incoming prefix=192.0.2.80/32 pushing outgoing labels and using the
> outgoing interface
> determined by the SID-List for FEC1.
>
> The rule in section 2.6 means that node A MUST NOT install an ingress MPLS
> forwarding entry
> corresponding to FEC2 ( which would be for incoming prefix=192.0.2.81/32).
>
>
> ========
>
> General comment:
>
> section 2.6 title:
> existing:
> Outgoing Label Collision:
> proposed:
> Effect of Incoming Label Collision on Outgoing Label Programming :
> --------------------------------------
>
>
> Thanks,
> Chris
>
>
> On Thu, May 24, 2018 at 12:14 PM, <bruno..decraene@orange.com
> <bruno.decraene@orange.com>> wrote:
>
>> Hello Working Group,
>>
>>
>>
>> This email starts a Working Group Last Call on draft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and ready for a final working group review.
>>
>>
>>
>> Please read this document if you haven't read the most recent version yet, and send your comments to the list, no later than *June 08*.
>>
>>
>>
>> As a reminder, this document had already passed a WGLC more than a year ago on version -06 [2], had been sent to the AD but then returned to the WG.
>>
>> Since then, the document has significantly changed, so please read it again. In particular, it now includes the resolution in case of incoming label collision. Hence it killed draft-ietf-spring-conflict-resolution.
>>
>>
>>
>> Both co-chairs co-author this document, hence:
>>
>> - Shraddha has agreed to be the document shepherd... Thank you Shraddha.
>>
>> - Martin, our AD, has agreed to evaluate the WG consensus.
>>
>>
>>
>> Thank you,
>>
>> Bruno, Rob
>>
>>
>>
>> [1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13
>>
>> [2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y
>>
>>
>>
>> _________________________________________________________________________________________________________________________
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-- 
Przemyslaw "PK" Krol |  Strategic Network Engineer ing | pkrol@google.com

--00000000000080b5ba056e3016c1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Greetings,<div><br></div><div>Few minor, cosmetic/editoria=
l suggestions:</div><div><div><br></div><div><font face=3D"monospace, monos=
pace">2.5. Incoming Label Collision<br></font></div><div><font face=3D"mono=
space, monospace">[...]</font></div><div><font face=3D"monospace, monospace=
"><b><font color=3D"#ff0000">(Endpoint, Color)</font></b> representing an S=
R policy [I.D. filsfils-spring-</font><span style=3D"font-family:monospace,=
monospace">segment-routing-policy]</span></div></div><div><br></div><div>(C=
olor, Endpoint) is the ordering used by the policy draft. If the decision i=
s to correct it, there is few references in the draft</div><div><br></div><=
div><div><font face=3D"monospace, monospace">2.5.1. Tie-breaking Rules</fon=
t></div></div><div><font face=3D"monospace, monospace">[...]</font></div><d=
iv><div><font face=3D"monospace, monospace">=C2=A0 =C2=A0 =C2=A0 =C2=A0o Th=
e Color ID is encoded using <font color=3D"#ff0000"><b>16 bits</b></font></=
font></div></div><div><font color=3D"#ff0000"><b><br></b></font></div><div>=
<font color=3D"#000000">should be 32 bits=C2=A0</font></div><div><font colo=
r=3D"#000000">(<a href=3D"https://tools.ietf.org/html/rfc5512#section-4.3.1=
">https://tools.ietf.org/html/rfc5512#section-4.3.1</a> &amp;&amp; <a href=
=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-00=
#section-2.1">https://tools.ietf.org/html/draft-ietf-spring-segment-routing=
-policy-00#section-2.1</a></font><span style=3D"color:rgb(0,0,0)">)</span><=
/div><div><br></div><div><br></div><div><div><font face=3D"monospace, monos=
pace">2.6. Outgoing Label Collision</font></div></div><div><font face=3D"mo=
nospace, monospace">[...]</font></div><div><div><font face=3D"monospace, mo=
nospace">In the general case, the ingress node may not have exactly <b><fon=
t color=3D"#ff0000"><strike style=3D"margin:0px;padding:0px;border:0px;font=
-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inher=
it;line-height:inherit;font-size:15px;vertical-align:baseline;box-sizing:in=
herit;text-align:left;background-color:rgb(255,255,255)">have</strike></fon=
t></b>=C2=A0the=C2=A0</font><span style=3D"font-family:monospace,monospace"=
>same data of the receiving node</span></div></div><div><br></div><div><fon=
t face=3D"monospace, monospace">2.7. PUSH, CONTINUE, and NEXT<br></font></d=
iv><div><div><font face=3D"monospace, monospace">PUSH, NEXT, and CONTINUE a=
re operations applied by the forwarding=C2=A0</font><span style=3D"font-fam=
ily:monospace,monospace">plan</span><b style=3D"font-family:monospace,monos=
pace"><font color=3D"#ff0000">e</font></b><span style=3D"font-family:monosp=
ace,monospace">.</span></div></div><div><font face=3D"monospace, monospace"=
>[...]</font></div><div><br></div><div><font face=3D"monospace, monospace">=
2.8. MPLS Label downloaded to FIB corresponding to Global and Local SIDs<br=
></font></div><div><font face=3D"monospace, monospace">[...]</font></div><d=
iv><div><font face=3D"monospace, monospace">an IGP with SR extensions <font=
 color=3D"#ff0000"><b>[</b></font>I-D.ietf-</font><span style=3D"font-famil=
y:monospace,monospace">isis-segment-routing-extensions, I-D.ietf-ospf-segme=
nt-routing-</span><span style=3D"font-family:monospace,monospace">extension=
s]</span></div></div><div><span style=3D"font-family:monospace,monospace"><=
br></span></div><div>^^^ missing &#39;[&#39; or alternatively both referenc=
es should be enclosed in their own []</div><div><br></div><div><br></div><d=
iv>thanks,</div><div>pk</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr">On Fri, Jun 8, 2018 at 11:14 AM Chris Bowers &lt;<a href=3D"mailto=
:chrisbowers.ietf@gmail.com">chrisbowers.ietf@gmail.com</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">SPRING WG,<br><br>I ge=
nerally support publication of<br>draft-ietf-spring-segment-routing-mpls. H=
owever, I think <br>that the text in sections 2.5 and 2.6 (on incoming labe=
l collisions)<br>needs some work before publication. This text was added to=
 <br>the draft a few months ago, and has not gotten much review<br>from the=
 WG as a whole. The review and proposed text below<br>focuses on these sect=
ions.<br><br>As I understand the current text of the draft, the general<br>=
approach to resolving incoming label collisions seems<br>well-reasoned and =
complete.=C2=A0 However, it is possible that <br>my interpretation of these=
 tie-breaking rules is <br>not what the authors intended.<br><br>I&#39;d li=
ke to propose the examples below to be included<br>in the draft to help cla=
rify the tie-breaking rules<br>for incoming label collisions described in s=
ection 2.5.<br>I have highlighted several cases in these examples,<br>where=
 I think the rules in section 2.5 need<br>to be clarified in order to unamb=
iguously determine <br>the winning FEC in an example.<br><br>It may also be=
 the case that the authors or other <br>WG participants will disagree with =
the interpretation of the <br>rules used to choose a winning FEC in some of=
 these<br>examples.=C2=A0 In that case, we should discuss<br>what is the co=
rrect interpretation, and clarify the <br>text in the draft to make the cor=
rect interpretation <br>clear.<br><br><br>Incoming label collision examples=
<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br><br>Node A<br>OSPF default admin distanc=
e for implementation=3D50<br>ISIS default admin distance for implementation=
=3D60<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict=
 for label=3D1005 on node A<br><br>FEC1)<br>OSPF prefix sid advertisement f=
rom node B for <a href=3D"http://198.51.100.5/32" target=3D"_blank">198.51.=
100.5/32</a> with index=3D5<br>OSPF SRGB on node A =3D [1000,1999]<br>Incom=
ing label=3D1005<br><br>FEC2)<br>ISIS prefix sid advertisement from node C =
for <a href=3D"http://203.0.113.105/32" target=3D"_blank">203.0.113.105/32<=
/a> with index=3D5<br>ISIS SRGB on node A =3D [1000,1999] <br>Incoming labe=
l=3D1005<br><br>FEC1 and FEC2 both use dynamic SID assignment.=C2=A0 Since =
neither of <br>the FEC types is SR Policy, we use the default admin distanc=
es of 50<br>and 60 to break the tie.=C2=A0 So FEC1 wins.<br><br>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1006 on n=
ode A<br><br>FEC1)<br>OSPF prefix sid advertisement from node B for <a href=
=3D"http://198.51.100.6/32" target=3D"_blank">198.51.100.6/32</a> with inde=
x=3D6<br>OSPF SRGB on node A =3D [1000,1999]<br>Incoming label=3D1006<br><b=
r>FEC2)<br>ISIS adjacency sid advertisement from node A with label=3D1006<b=
r>Incoming label=3D1006<br>Node A allocates this adjacency SID dynamically,=
 <br>and it may differ across router reboots.<br><br>FEC1 and FEC2 both use=
 dynamic SID assignment.=C2=A0 Since neither of <br>the FEC types is SR Pol=
icy, we use the default admin distances of 50<br>and 60 to break the tie.=
=C2=A0 So FEC1 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming=
 label conflict for label=3D1007 on node A<br><br>FEC1)<br>OSPF prefix sid =
advertisement from node B for <a href=3D"http://198.51.100.7/32" target=3D"=
_blank">198.51.100.7/32</a> with index=3D7<br>OSPF SRGB on node A =3D [1000=
,1999]<br>Incoming label=3D1007<br><br>FEC2)<br>ISIS adjacency sid advertis=
ement from node A with label=3D1007<br>Incoming label=3D1007<br>Node A assi=
gns this adjacency SID explicitly via configuration, <br>so the adjacency S=
ID survives router reboots.<br><br>FEC1 uses dynamic SID assignment, while =
FEC2 uses explicit SID <br>assignment. So FEC2 wins.<br><br>=3D=3D=3D=3D=3D=
=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1008 on node A<=
br><br>FEC1)<br>OSPF prefix sid advertisement from node B for <a href=3D"ht=
tp://198.51.100.8/32" target=3D"_blank">198.51.100..8/32</a> with index=3D8=
<br>OSPF SRGB on node A =3D [1000,1999]<br>Incoming label=3D1008<br><br>FEC=
2)<br>SR Policy advertisement from controller to node A<br>Endpoint =3D 192=
.0.2.208, color =3D 100, SID-List =3D &lt;S1, S2&gt;<br>Binding-SID label =
=3D 1008<br><br>FEC1 and FEC2 both use dynamic SID assignment.=C2=A0 <br>Si=
nce one of the FEC types is SR Policy, default admin<br>distance is not use=
d to break the tie.=C2=A0 <br>/* The text in Section 2.5.1 needs to be clar=
ified to specify<br>whether SR Policy always loses or always wins in this c=
ase. */<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label confli=
ct for label=3D1009 on node A<br><br>FEC1)<br>OSPF adjacency sid advertisem=
ent by node A with label=3D1009<br>Incoming label=3D1009<br>Node A assigns =
this adjacency SID explicitly via configuration, <br>so the adjacency SID s=
urvives router reboots.<br><br>FEC2)<br>ISIS adjacency sid advertisement by=
 node A with label=3D1009<br>Incoming label=3D1009<br>Node A assigns this a=
djacency SID explicitly via configuration, <br>so the adjacency SID survive=
s router reboots.<br><br>FEC1 and FEC2 both use explicit SID assignment.=C2=
=A0 This kind of <br>incoming label collision should never occur, since an =
<br>implement of explicit SID assignment MUST guarantee<br>collision freene=
ss on the same router.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming =
label conflict for label=3D1010 on node A<br><br>FEC1)<br>ISIS prefix sid a=
dvertisement from node B for <a href=3D"http://203.0.113.110/32" target=3D"=
_blank">203.0.113.110/32</a> with index=3D10<br>ISIS SRGB on node A =3D [10=
00,1999]<br>Incoming label=3D1010<br><br>FEC2)<br>ISIS adjacency sid advert=
isement by node A with label=3D1010<br>Incoming label=3D1010<br>Node A allo=
cates this adjacency SID dynamically,<br>and it may differ across router re=
boots.<br><br>FEC1 and FEC2 both use dynamic SID assignment. Since both FEC=
s <br>are from the same MCC, they have the same default admin distance.<br>=
So we compare FEC type code-point.=C2=A0 FEC1 has FEC type <br>code-point=
=3D120, while FEC2 has FEC type code-point=3D130.<br>Therefore, FEC1 wins.=
=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label confli=
ct for label=3D1011 on node A<br><br>FEC1)<br>ISIS prefix sid advertisement=
 from node B for <a href=3D"http://203.0.113.111/32" target=3D"_blank">203.=
0.113.111/32</a> with index=3D11<br>ISIS SRGB on node A =3D [1000,1999]<br>=
Incoming label=3D1011<br><br>FEC2)<br>ISIS prefix sid advertisement from no=
de C for 2001:DB8:1000::11/128 with index=3D11<br>ISIS SRGB on node A =3D [=
1000,1999]<br>Incoming label=3D1011<br><br>FEC1 and FEC2 both use dynamic S=
ID assignment. Since both FECs <br>are from the same MCC, they have the sam=
e default admin distance.<br>So we compare FEC type code-point.=C2=A0 Both =
FECs have FEC type <br>code-point=3D120. So we compare address family.=C2=
=A0 Since IPv4 is <br>preferred over IPv6, FEC1 wins.<br><br>=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1012 on node=
 A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D=
"http://203.0.113.112/32" target=3D"_blank">203.0.113.112/32</a> with index=
=3D12<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1012<br><b=
r>FEC2)<br>ISIS prefix sid advertisement from node C for <a href=3D"http://=
203.0.113.128/30" target=3D"_blank">203.0.113.128/30</a> with index=3D12<br=
>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1012<br><br>FEC1 a=
nd FEC2 both use dynamic SID assignment. Since both FECs <br>are from the s=
ame MCC, they have the same default admin distance.<br>So we compare FEC ty=
pe code-point.=C2=A0 Both FECs have FEC type <br>code-point=3D120. So we co=
mpare address family.=C2=A0 Both are IPv4 address<br>family, so we compare =
prefix length.=C2=A0 FEC1 has prefix length=3D32, <br>and FEC2 has prefix l=
ength=3D30, so FEC2 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example inc=
oming label conflict for label=3D1013 on node A<br><br>FEC1)<br>ISIS prefix=
 sid advertisement from node B for <a href=3D"http://203.0.113.113/32" targ=
et=3D"_blank">203.0.113.113/32</a> with index=3D13<br>ISIS SRGB on node A =
=3D [1000,1999]<br>Incoming label=3D1013<br><br>FEC2)<br>ISIS prefix sid ad=
vertisement from node C for <a href=3D"http://203.0.113.213/32" target=3D"_=
blank">203.0.113..213/32</a> with index=3D13<br>ISIS SRGB on node A =3D [10=
00,1999]<br>Incoming label=3D1013<br><br>FEC1 and FEC2 both use dynamic SID=
 assignment. Since both FECs <br>are from the same MCC, they have the same =
default admin distance.<br>So we compare FEC type code-point.=C2=A0 Both FE=
Cs have FEC type <br>code-point=3D120. So we compare address family.=C2=A0 =
Both are IPv4 address<br>family, so we compare prefix length.=C2=A0 Prefix =
lengths are the same,<br>so we compare prefix.=C2=A0 FEC1 has the lower pre=
fix, so FEC1 wins..<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming =
label conflict for label=3D1014 on node A<br><br>FEC1)<br>ISIS prefix sid a=
dvertisement from node B for <a href=3D"http://203.0.113.114/32" target=3D"=
_blank">203.0.113.114/32</a> with index=3D14<br>Routing Instance ID =3D 100=
0<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1014<br><br>FE=
C2)<br>ISIS prefix sid advertisement from node C for <a href=3D"http://203.=
0.113.114/32" target=3D"_blank">203.0.113.114/32</a> with index=3D14<br>Rou=
ting Instance ID =3D 2000<br>ISIS SRGB on node A =3D [1000,1999]<br>Incomin=
g label=3D1014<br><br>These two FECs match all the way through the prefix l=
ength and prefix. <br>So Routing Instance ID breaks the tie, with FEC1 winn=
ing.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict =
for label=3D1015 on node A<br><br>FEC1)<br>ISIS prefix sid advertisement fr=
om node B for <a href=3D"http://203.0.113.115/32" target=3D"_blank">203.0.1=
13.115/32</a> with index=3D15<br>Routing Instance ID =3D 1000<br>ISIS Multi=
-topology ID =3D 50<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming labe=
l=3D1015<br><br>FEC2)<br>ISIS prefix sid advertisement from node C for <a h=
ref=3D"http://203.0.113.115/32" target=3D"_blank">203.0.113.115/32</a> with=
 index=3D15<br>Routing Instance ID =3D 1000<br>ISIS Multi-topology ID =3D 4=
0<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1015<br><br>Th=
ese two FECs match all the way through the prefix length, prefix, and <br>R=
outing Instance ID.=C2=A0 We compare ISIS Multi-topology ID, so FEC2 wins.<=
br><br>/* There appears to be a typo in section 2.5.1, with two different <=
br>orderings shown for a prefix-based FEC: <br>Prefix, Routing Instance, To=
pology, Algorithm<br>and<br>(Prefix Length, Prefix, SR Algorithm, routing_i=
nstance_id, Topology)<br>This needs to be corrected. */<br><br>=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1016 on node=
 A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D=
"http://203.0.113.116/32" target=3D"_blank">203.0.113.116/32</a> with index=
=3D16<br>Routing Instance ID =3D 1000<br>ISIS Multi-topology ID =3D 50<br>S=
R algorithm =3D 0<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=
=3D1016<br><br>FEC2)<br>ISIS prefix sid advertisement from node C for <a hr=
ef=3D"http://203.0.113.116/32" target=3D"_blank">203..0.113.116/32</a> with=
 index=3D16<br>Routing Instance ID =3D 1000<br>ISIS Multi-topology ID =3D 5=
0<br>SR algorithm =3D 22<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming=
 label=3D1016<br><br>These two FECs match all the way through the prefix le=
ngth, prefix, and <br>Routing Instance ID, and Multi-topology ID. We compar=
e SR algorithm ID, so<br>FEC1 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>E=
xample incoming label conflict for label=3D1017 on node A<br><br>FEC1)<br>I=
SIS prefix sid advertisement from node B for <a href=3D"http://203.0.113.11=
7/32" target=3D"_blank">203.0.113.117/32</a> with index=3D17<br>ISIS SRGB o=
n node A =3D [1000,1999]<br>Incoming label=3D1017<br><br>FEC2)<br>ISIS mapp=
ing server advertisement (SID/Label Binding TLV) from node D:<br>Range=3D10=
0, Prefix =3D <a href=3D"http://203.0.113.1/32" target=3D"_blank">203.0.113=
.1/32</a><br>This mapping server advertisment generates 100 mappings, one o=
f which <br>maps <a href=3D"http://203.0.113.17/32" target=3D"_blank">203.0=
.113.17/32</a> to index=3D17.<br>ISIS SRGB on node A =3D [1000,1999]<br>Inc=
oming label=3D1017<br><br>The fact that FEC1 comes from a normal prefix sid=
 advertisement and <br>FEC2 is generated from a mapping server advertisemen=
t is not <br>used as a tie-breaking parameter. Both FECs use dynamic SID as=
signment,<br>are from the same MCC, have the same FEC type code-point=3D120=
. Their prefix<br>lengths are the same as well.=C2=A0 FEC2 wins based on lo=
wer numerical prefix value,<br>since 203.0.113.17 is less than 203.0.113.11=
7.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict fo=
r label=3D1018 on node A<br><br>FEC1)<br>ISIS IPv4 adjacency sid advertisem=
ent from node A with label=3D1018<br>corresponding to next-hop interface ad=
dress=3D192.0.2.100, outgoing interface ID=3D5<br>Incoming label=3D1018<br>=
Node A allocates this adjacency SID dynamically, <br>and it may differ acro=
ss router reboots.<br><br>FEC2)<br>ISIS IPv6 adjacency sid advertisement fr=
om node A with label=3D1018<br>corresponding to 2001:DB8:2000::100/128, out=
going interface ID=3D6.<br>Incoming label=3D1018<br>Node A allocates this a=
djacency SID dynamically, <br>and it may differ across router reboots.<br><=
br>Both FECs use dynamic SID assignment, are from the same MCC,<br>and have=
 the same FEC type code-point=3D130.=C2=A0 FEC1 wins <br>because IPv4 addre=
ss family is preferred over IPv6.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Exa=
mple incoming label conflict for label=3D1019 on node A<br><br>FEC1)<br>ISI=
S IPv4 adjacency sid advertisement from node A with label=3D1019<br>corresp=
onding to next-hop interface address=3D192.0.2.220, outgoing interface ID=
=3D7<br>Incoming label=3D1019<br>Node A allocates this adjacency SID dynami=
cally, <br>and it may differ across router reboots.<br><br>FEC2)<br>ISIS IP=
v4 adjacency sid advertisement from node A with label=3D1019<br>correspondi=
ng to next-hop interface address=3D192.0.2.230, outgoing interface ID=3D8<b=
r>Incoming label=3D1019<br>Node A allocates this adjacency SID dynamically,=
 <br>and it may differ across router reboots.<br><br>Both FECs use dynamic =
SID assignment, are from the same MCC,<br>and have the same FEC type code-p=
oint=3D130. Both FECs have to <br>same address family.=C2=A0 FEC1 wins base=
d on having the lowest next-hop<br>interface address.=C2=A0 <br><br>/* It i=
s not clear how to construct an example that <br>would result in using the =
outgoing interface ID as a tie-breaker.<br>It would be useful to understand=
 why this is and clarify <br>it in the text. */<br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D<br>Example incoming label conflict for label=3D1020 on node A<br><br>FE=
C1)<br>SR Policy advertisement from controller to node A<br>Endpoint addres=
s=3D2001:DB8:3000::100, color=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-S=
ID label=3D1020<br><br>FEC2)<br>SR Policy advertisement from controller to =
node A<br>Endpoint address=3D192.0.2.60, color=3D100, SID-List=3D&lt;S3, S4=
&gt;<br>Binding-SID label=3D1020<br><br>The FECs match through the tie-brea=
ks up to and including<br>having the same FEC type code-point=3D140.<br>FEC=
2 wins based on IPv4 address family being preferred<br>over IPv6.=C2=A0=C2=
=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict =
for label=3D1021 on node A<br><br>FEC1)<br>SR Policy advertisement from con=
troller to node A<br>Endpoint address=3D192.0.2.70, color=3D100, SID-List=
=3D&lt;S1, S2&gt;<br>Binding-SID label=3D1021<br><br>FEC2)<br>SR Policy adv=
ertisement from controller to node A<br>Endpoint address=3D192.0.2.71, colo=
r=3D100, SID-List=3D&lt;S3, S4&gt;<br>Binding-SID label=3D1021<br><br>The F=
ECs match through the tie-breaks up to and including<br>having the same add=
ress family. FEC1 wins by having the <br>lower numerical endpoint address v=
alue.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br><br>I&#39;d like to propose the=
 examples below to be included<br>in the draft to help clarify section 2.6 =
<br>(currently entitled &quot;Outgoing Label Collision&quot;).<br><br><br>E=
xamples of the Effect Incoming Label Collision on Outgoing Label Programmin=
g<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br><br>Example of effect of incomin=
g label collision for label=3D1022<br>on outgoing label programming on node=
 A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D=
"http://203.0.113.122/32" target=3D"_blank">203.0.113.122/32</a> with index=
=3D22<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1022<br><b=
r>FEC2)<br>ISIS prefix sid advertisement from node C for <a href=3D"http://=
203.0.113.222/32" target=3D"_blank">203.0.113.222/32</a> with index=3D22<br=
>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1022<br><br>FEC1 w=
ins based on lowest numerical prefix value.=C2=A0 This means that node A<br=
>installs a transit MPLS forwarding entry to SWAP incoming label=3D1022, wi=
th outgoing label N, <br>and use outgoing interace I. N is determined by th=
e index associated with FEC1 (index=3D22) and <br>the SRGB advertised by th=
e next-hop node on the shortest path to reach<br><a href=3D"http://203.0.11=
3.122/32" target=3D"_blank">203.0.113.122/32</a>. <br><br>Node A will gener=
ally also install an ingress MPLS forwarding entry corresponding to FEC1 fo=
r <br>incoming prefix=3D<a href=3D"http://203.0.113.122/32" target=3D"_blan=
k">203.0.113.122/32</a> pushing outgoing label N, and using outgoing intera=
ce I.<br><br>The rule in section 2.6 means that node A MUST NOT install an =
ingress MPLS forwarding entry <br>corresponding to FEC2 ( which would be fo=
r incoming prefix=3D<a href=3D"http://203.0.113.222/32" target=3D"_blank">2=
03.0.113.222/32</a>).=C2=A0 <br>=3D=3D=3D=3D=3D=3D=3D=3D<br><br>Example of =
effect of incoming label collision for label=3D1023<br>on outgoing label pr=
ogramming on node A<br><br>FEC1)<br>SR Policy advertisement from controller=
 to node A<br>Endpoint address=3D192.0.2.80, color=3D100, SID-List=3D&lt;S1=
, S2&gt;<br>Binding-SID label=3D1023<br><br>FEC2)<br>SR Policy advertisemen=
t from controller to node A<br>Endpoint address=3D192.0.2.81, color=3D100, =
SID-List=3D&lt;S3, S4&gt;<br>Binding-SID label=3D1023<br><br>FEC1 wins by h=
aving the lower numerical endpoint address value. This means that node A<br=
>installs a transit MPLS forwarding entry to SWAP incoming label=3D1023, wi=
th outgoing labels <br>and outgoing interface determined by the SID-List fo=
r FEC1. <br>Node A will generally also install an ingress MPLS forwarding e=
ntry corresponding to FEC1 for <br>incoming prefix=3D<a href=3D"http://192.=
0.2.80/32" target=3D"_blank">192.0.2.80/32</a> pushing outgoing labels and =
using the outgoing interface <br>determined by the SID-List for FEC1. <br><=
br>The rule in section 2.6 means that node A MUST NOT install an ingress MP=
LS forwarding entry <br>corresponding to FEC2 ( which would be for incoming=
 prefix=3D<a href=3D"http://192.0.2.81/32" target=3D"_blank">192.0.2.81/32<=
/a>).=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D<br><br>General comment:<br><br=
>section 2.6 title:<br>existing:<br>Outgoing Label Collision:<br>proposed:<=
br>Effect of Incoming Label Collision on Outgoing Label Programming :<br><d=
iv>--------------------------------------</div><div><br></div><div><br></di=
v><div>Thanks,</div><div>Chris<br></div><br><div class=3D"gmail_extra"><br>=
<div class=3D"gmail_quote">On Thu, May 24, 2018 at 12:14 PM,  <span dir=3D"=
ltr">&lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bru=
no..decraene@orange.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">





<div lang=3D"FR">
<div class=3D"m_-5217648212762046684gmail-m_-7987155459334438273WordSection=
1">
<pre><span lang=3D"EN-US">Hello Working Group,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and =
ready for a final working group review.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven&#39;t read=
 the most recent version yet, and send your comments to the list, no later =
than *June 08*.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-resolution.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<u>=
</u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
... Thank you Shraddha.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Thank you,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">[1] <a href=3D"https://tools.ietf.org/html/draft-=
ietf-spring-segment-routing-mpls-13" target=3D"_blank">https://tools.ietf.o=
rg/html/draft-ietf-spring-segment-routing-mpls-13</a><u></u><u></u></span><=
/pre>
<pre><span lang=3D"EN-US">[2] <a href=3D"https://mailarchive.ietf.org/arch/=
msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y" target=3D"_blank">https://mailarchi=
ve.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><u></u><u></u></=
span></pre>
<pre><span style=3D"font-family:&quot;Arial&quot;,&quot;sans-serif&quot;" l=
ang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
</div>
<pre>______________________________________________________________________=
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<br>_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
<br></blockquote></div><br></div></div>
_______________________________________________<br>
spring mailing list<br>
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 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div>=
<div dir=3D"ltr"><div><div dir=3D"ltr"><div><div style=3D"padding-top:10px;=
margin-top:10px"><table cellspacing=3D"0" cellpadding=3D"0" style=3D"color:=
rgb(0,0,0);font-family:Times;line-height:normal;font-size:medium"><tbody><t=
r style=3D"color:rgb(85,85,85);font-family:sans-serif;font-size:small"><td =
style=3D"border-top-style:solid;border-top-color:rgb(213,15,37);border-top-=
width:2px">Przemyslaw &quot;PK&quot; Krol |</td><td style=3D"border-top-sty=
le:solid;border-top-color:rgb(51,105,232);border-top-width:2px">=C2=A0Strat=
egic Network Engineer</td><td style=3D"border-top-style:solid;border-top-co=
lor:rgb(0,153,57);border-top-width:2px"><span style=3D"line-height:19px;whi=
te-space:normal"><span style=3D"border-top-width:2px;border-right-width:0px=
;border-bottom-width:0px;border-left-width:0px;border-top-style:solid;borde=
r-right-style:solid;border-bottom-style:solid;border-left-style:solid;borde=
r-top-color:rgb(51,105,232);border-right-color:rgb(51,105,232);border-botto=
m-color:rgb(51,105,232);border-left-color:rgb(51,105,232);padding-top:2px;m=
argin-top:2px">ing |</span><span style=3D"border-top-width:2px;border-right=
-width:0px;border-bottom-width:0px;border-left-width:0px;border-top-style:s=
olid;border-right-style:solid;border-bottom-style:solid;border-left-style:s=
olid;border-top-color:rgb(0,153,57);border-right-color:rgb(0,153,57);border=
-bottom-color:rgb(0,153,57);border-left-color:rgb(0,153,57);padding-top:2px=
;margin-top:2px">=C2=A0<a href=3D"mailto:pkrol@google.com" target=3D"_blank=
"><font color=3D"#1155cc">pkrol@google.com</font></a>=C2=A0</span></span></=
td><td style=3D"border-top-style:solid;border-top-color:rgb(238,178,17);bor=
der-top-width:2px"><br></td></tr></tbody></table></div></div></div></div></=
div></div></div></div></div></div></div></div></div></div>

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To: Robert Raszuk <robert@raszuk.net>
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Subject: Re: [spring] Updating the SPRING WG Charter
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From nobody Sat Jun  9 12:30:28 2018
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From: Przemyslaw Krol <pkrol@google.com>
Date: Sat, 9 Jun 2018 12:29:42 -0700
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Greetings,

In terms of UHP, draft-ietf-isis-segment-routing-extensions-16
<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16#section-2.1.1>
describes
2 cases:
 - P set, E unset
 - P set, E set

However it looks that draft-ietf-spring-segment-routing-15
<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#section-3.1.2>
doesn't
make that distinction and doesn't seem to cover the latter case:

   o  A remote node M MUST maintain the following FIB entry for any
      learned Prefix-SID SID-R attached to IP prefix R:

     Incoming Active Segment: SID-R
     Ingress Operation:
        If the next-hop of R is the originator of R
        and instructed to remove the active segment: NEXT
*        Else: CONTINUE*
     Egress interface: the interface towards the next-hop along the
                       path computed using the algorithm advertised with
                       the SID toward prefix R.


Would it make sense to also describe the 2nd option (E+P) given ISIS draft
brings this up as a use case?

thanks,
pk



On Sat, Jun 9, 2018 at 12:01 AM Przemyslaw Krol <pkrol@google.com> wrote:

> Greetings,
>
> Few minor, cosmetic/editorial suggestions:
>
> 2.5. Incoming Label Collision
> [...]
> *(Endpoint, Color)* representing an SR policy [I.D. filsfils-spring-
> segment-routing-policy]
>
> (Color, Endpoint) is the ordering used by the policy draft. If the
> decision is to correct it, there is few references in the draft
>
> 2.5.1. Tie-breaking Rules
> [...]
>        o The Color ID is encoded using *16 bits*
>
> should be 32 bits
> (https://tools.ietf.org/html/rfc5512#section-4.3.1 &&
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-00#section-2.1
> )
>
>
> 2.6. Outgoing Label Collision
> [...]
> In the general case, the ingress node may not have exactly *have* the same
> data of the receiving node
>
> 2.7. PUSH, CONTINUE, and NEXT
> PUSH, NEXT, and CONTINUE are operations applied by the forwarding plan*e*.
> [...]
>
> 2.8. MPLS Label downloaded to FIB corresponding to Global and Local SIDs
> [...]
> an IGP with SR extensions *[*I-D.ietf-isis-segment-routing-extensions,
> I-D.ietf-ospf-segment-routing-extensions]
>
> ^^^ missing '[' or alternatively both references should be enclosed in
> their own []
>
>
> thanks,
> pk
>
> On Fri, Jun 8, 2018 at 11:14 AM Chris Bowers <chrisbowers.ietf@gmail.com>
> wrote:
>
>> SPRING WG,
>>
>> I generally support publication of
>> draft-ietf-spring-segment-routing-mpls. However, I think
>> that the text in sections 2.5 and 2.6 (on incoming label collisions)
>> needs some work before publication. This text was added to
>> the draft a few months ago, and has not gotten much review
>> from the WG as a whole. The review and proposed text below
>> focuses on these sections.
>>
>> As I understand the current text of the draft, the general
>> approach to resolving incoming label collisions seems
>> well-reasoned and complete.  However, it is possible that
>> my interpretation of these tie-breaking rules is
>> not what the authors intended.
>>
>> I'd like to propose the examples below to be included
>> in the draft to help clarify the tie-breaking rules
>> for incoming label collisions described in section 2.5.
>> I have highlighted several cases in these examples,
>> where I think the rules in section 2.5 need
>> to be clarified in order to unambiguously determine
>> the winning FEC in an example.
>>
>> It may also be the case that the authors or other
>> WG participants will disagree with the interpretation of the
>> rules used to choose a winning FEC in some of these
>> examples.  In that case, we should discuss
>> what is the correct interpretation, and clarify the
>> text in the draft to make the correct interpretation
>> clear.
>>
>>
>> Incoming label collision examples
>> =========
>>
>> Node A
>> OSPF default admin distance for implementation=50
>> ISIS default admin distance for implementation=60
>>
>> =========
>> Example incoming label conflict for label=1005 on node A
>>
>> FEC1)
>> OSPF prefix sid advertisement from node B for 198.51.100.5/32 with
>> index=5
>> OSPF SRGB on node A = [1000,1999]
>> Incoming label=1005
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113.105/32 with
>> index=5
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1005
>>
>> FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
>> the FEC types is SR Policy, we use the default admin distances of 50
>> and 60 to break the tie.  So FEC1 wins.
>>
>> =========
>> Example incoming label conflict for label=1006 on node A
>>
>> FEC1)
>> OSPF prefix sid advertisement from node B for 198.51.100.6/32 with
>> index=6
>> OSPF SRGB on node A = [1000,1999]
>> Incoming label=1006
>>
>> FEC2)
>> ISIS adjacency sid advertisement from node A with label=1006
>> Incoming label=1006
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> FEC1 and FEC2 both use dynamic SID assignment.  Since neither of
>> the FEC types is SR Policy, we use the default admin distances of 50
>> and 60 to break the tie.  So FEC1 wins.
>>
>> =========
>> Example incoming label conflict for label=1007 on node A
>>
>> FEC1)
>> OSPF prefix sid advertisement from node B for 198.51.100.7/32 with
>> index=7
>> OSPF SRGB on node A = [1000,1999]
>> Incoming label=1007
>>
>> FEC2)
>> ISIS adjacency sid advertisement from node A with label=1007
>> Incoming label=1007
>> Node A assigns this adjacency SID explicitly via configuration,
>> so the adjacency SID survives router reboots.
>>
>> FEC1 uses dynamic SID assignment, while FEC2 uses explicit SID
>> assignment. So FEC2 wins.
>>
>> =========
>> Example incoming label conflict for label=1008 on node A
>>
>> FEC1)
>> OSPF prefix sid advertisement from node B for 198.51.100..8/32
>> <http://198.51.100.8/32> with index=8
>> OSPF SRGB on node A = [1000,1999]
>> Incoming label=1008
>>
>> FEC2)
>> SR Policy advertisement from controller to node A
>> Endpoint = 192.0.2.208, color = 100, SID-List = <S1, S2>
>> Binding-SID label = 1008
>>
>> FEC1 and FEC2 both use dynamic SID assignment.
>> Since one of the FEC types is SR Policy, default admin
>> distance is not used to break the tie.
>> /* The text in Section 2.5.1 needs to be clarified to specify
>> whether SR Policy always loses or always wins in this case. */
>>
>> =========
>> Example incoming label conflict for label=1009 on node A
>>
>> FEC1)
>> OSPF adjacency sid advertisement by node A with label=1009
>> Incoming label=1009
>> Node A assigns this adjacency SID explicitly via configuration,
>> so the adjacency SID survives router reboots.
>>
>> FEC2)
>> ISIS adjacency sid advertisement by node A with label=1009
>> Incoming label=1009
>> Node A assigns this adjacency SID explicitly via configuration,
>> so the adjacency SID survives router reboots.
>>
>> FEC1 and FEC2 both use explicit SID assignment.  This kind of
>> incoming label collision should never occur, since an
>> implement of explicit SID assignment MUST guarantee
>> collision freeness on the same router.
>>
>> ========
>> Example incoming label conflict for label=1010 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.110/32 with
>> index=10
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1010
>>
>> FEC2)
>> ISIS adjacency sid advertisement by node A with label=1010
>> Incoming label=1010
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
>> are from the same MCC, they have the same default admin distance.
>> So we compare FEC type code-point.  FEC1 has FEC type
>> code-point=120, while FEC2 has FEC type code-point=130.
>> Therefore, FEC1 wins.
>>
>> =========
>> Example incoming label conflict for label=1011 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.111/32 with
>> index=11
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1011
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 2001:DB8:1000::11/128 with
>> index=11
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1011
>>
>> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
>> are from the same MCC, they have the same default admin distance.
>> So we compare FEC type code-point.  Both FECs have FEC type
>> code-point=120. So we compare address family.  Since IPv4 is
>> preferred over IPv6, FEC1 wins.
>>
>> =========
>> Example incoming label conflict for label=1012 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.112/32 with
>> index=12
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1012
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113.128/30 with
>> index=12
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1012
>>
>> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
>> are from the same MCC, they have the same default admin distance.
>> So we compare FEC type code-point.  Both FECs have FEC type
>> code-point=120. So we compare address family.  Both are IPv4 address
>> family, so we compare prefix length.  FEC1 has prefix length=32,
>> and FEC2 has prefix length=30, so FEC2 wins.
>>
>> =========
>> Example incoming label conflict for label=1013 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.113/32 with
>> index=13
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1013
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113..213/32
>> <http://203.0.113.213/32> with index=13
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1013
>>
>> FEC1 and FEC2 both use dynamic SID assignment. Since both FECs
>> are from the same MCC, they have the same default admin distance.
>> So we compare FEC type code-point.  Both FECs have FEC type
>> code-point=120. So we compare address family.  Both are IPv4 address
>> family, so we compare prefix length.  Prefix lengths are the same,
>> so we compare prefix.  FEC1 has the lower prefix, so FEC1 wins..
>>
>> =========
>> Example incoming label conflict for label=1014 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.114/32 with
>> index=14
>> Routing Instance ID = 1000
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1014
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113.114/32 with
>> index=14
>> Routing Instance ID = 2000
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1014
>>
>> These two FECs match all the way through the prefix length and prefix.
>> So Routing Instance ID breaks the tie, with FEC1 winning.
>>
>> =========
>> Example incoming label conflict for label=1015 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.115/32 with
>> index=15
>> Routing Instance ID = 1000
>> ISIS Multi-topology ID = 50
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1015
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113.115/32 with
>> index=15
>> Routing Instance ID = 1000
>> ISIS Multi-topology ID = 40
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1015
>>
>> These two FECs match all the way through the prefix length, prefix, and
>> Routing Instance ID.  We compare ISIS Multi-topology ID, so FEC2 wins.
>>
>> /* There appears to be a typo in section 2.5.1, with two different
>> orderings shown for a prefix-based FEC:
>> Prefix, Routing Instance, Topology, Algorithm
>> and
>> (Prefix Length, Prefix, SR Algorithm, routing_instance_id, Topology)
>> This needs to be corrected. */
>>
>> =========
>> Example incoming label conflict for label=1016 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.116/32 with
>> index=16
>> Routing Instance ID = 1000
>> ISIS Multi-topology ID = 50
>> SR algorithm = 0
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1016
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203..0.113.116/32
>> <http://203.0.113.116/32> with index=16
>> Routing Instance ID = 1000
>> ISIS Multi-topology ID = 50
>> SR algorithm = 22
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1016
>>
>> These two FECs match all the way through the prefix length, prefix, and
>> Routing Instance ID, and Multi-topology ID. We compare SR algorithm ID, so
>> FEC1 wins.
>>
>> =========
>> Example incoming label conflict for label=1017 on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.117/32 with
>> index=17
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1017
>>
>> FEC2)
>> ISIS mapping server advertisement (SID/Label Binding TLV) from node D:
>> Range=100, Prefix = 203.0.113.1/32
>> This mapping server advertisment generates 100 mappings, one of which
>> maps 203.0.113.17/32 to index=17.
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1017
>>
>> The fact that FEC1 comes from a normal prefix sid advertisement and
>> FEC2 is generated from a mapping server advertisement is not
>> used as a tie-breaking parameter. Both FECs use dynamic SID assignment,
>> are from the same MCC, have the same FEC type code-point=120. Their prefix
>> lengths are the same as well.  FEC2 wins based on lower numerical prefix
>> value,
>> since 203.0.113.17 is less than 203.0.113.117.
>>
>> =========
>> Example incoming label conflict for label=1018 on node A
>>
>> FEC1)
>> ISIS IPv4 adjacency sid advertisement from node A with label=1018
>> corresponding to next-hop interface address=192.0.2.100, outgoing
>> interface ID=5
>> Incoming label=1018
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> FEC2)
>> ISIS IPv6 adjacency sid advertisement from node A with label=1018
>> corresponding to 2001:DB8:2000::100/128, outgoing interface ID=6.
>> Incoming label=1018
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> Both FECs use dynamic SID assignment, are from the same MCC,
>> and have the same FEC type code-point=130.  FEC1 wins
>> because IPv4 address family is preferred over IPv6.
>>
>> =========
>> Example incoming label conflict for label=1019 on node A
>>
>> FEC1)
>> ISIS IPv4 adjacency sid advertisement from node A with label=1019
>> corresponding to next-hop interface address=192.0.2.220, outgoing
>> interface ID=7
>> Incoming label=1019
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> FEC2)
>> ISIS IPv4 adjacency sid advertisement from node A with label=1019
>> corresponding to next-hop interface address=192.0.2.230, outgoing
>> interface ID=8
>> Incoming label=1019
>> Node A allocates this adjacency SID dynamically,
>> and it may differ across router reboots.
>>
>> Both FECs use dynamic SID assignment, are from the same MCC,
>> and have the same FEC type code-point=130. Both FECs have to
>> same address family.  FEC1 wins based on having the lowest next-hop
>> interface address.
>>
>> /* It is not clear how to construct an example that
>> would result in using the outgoing interface ID as a tie-breaker.
>> It would be useful to understand why this is and clarify
>> it in the text. */
>> =========
>> Example incoming label conflict for label=1020 on node A
>>
>> FEC1)
>> SR Policy advertisement from controller to node A
>> Endpoint address=2001:DB8:3000::100, color=100, SID-List=<S1, S2>
>> Binding-SID label=1020
>>
>> FEC2)
>> SR Policy advertisement from controller to node A
>> Endpoint address=192.0.2.60, color=100, SID-List=<S3, S4>
>> Binding-SID label=1020
>>
>> The FECs match through the tie-breaks up to and including
>> having the same FEC type code-point=140.
>> FEC2 wins based on IPv4 address family being preferred
>> over IPv6.
>>
>> =========
>> Example incoming label conflict for label=1021 on node A
>>
>> FEC1)
>> SR Policy advertisement from controller to node A
>> Endpoint address=192.0.2.70, color=100, SID-List=<S1, S2>
>> Binding-SID label=1021
>>
>> FEC2)
>> SR Policy advertisement from controller to node A
>> Endpoint address=192.0.2.71, color=100, SID-List=<S3, S4>
>> Binding-SID label=1021
>>
>> The FECs match through the tie-breaks up to and including
>> having the same address family. FEC1 wins by having the
>> lower numerical endpoint address value.
>>
>> =========
>>
>> I'd like to propose the examples below to be included
>> in the draft to help clarify section 2.6
>> (currently entitled "Outgoing Label Collision").
>>
>>
>> Examples of the Effect Incoming Label Collision on Outgoing Label
>> Programming
>> ====================================
>>
>> Example of effect of incoming label collision for label=1022
>> on outgoing label programming on node A
>>
>> FEC1)
>> ISIS prefix sid advertisement from node B for 203.0.113.122/32 with
>> index=22
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1022
>>
>> FEC2)
>> ISIS prefix sid advertisement from node C for 203.0.113.222/32 with
>> index=22
>> ISIS SRGB on node A = [1000,1999]
>> Incoming label=1022
>>
>> FEC1 wins based on lowest numerical prefix value.  This means that node A
>> installs a transit MPLS forwarding entry to SWAP incoming label=1022,
>> with outgoing label N,
>> and use outgoing interace I. N is determined by the index associated with
>> FEC1 (index=22) and
>> the SRGB advertised by the next-hop node on the shortest path to reach
>> 203.0.113.122/32.
>>
>> Node A will generally also install an ingress MPLS forwarding entry
>> corresponding to FEC1 for
>> incoming prefix=203.0.113.122/32 pushing outgoing label N, and using
>> outgoing interace I.
>>
>> The rule in section 2.6 means that node A MUST NOT install an ingress
>> MPLS forwarding entry
>> corresponding to FEC2 ( which would be for incoming prefix=
>> 203.0.113.222/32).
>> ========
>>
>> Example of effect of incoming label collision for label=1023
>> on outgoing label programming on node A
>>
>> FEC1)
>> SR Policy advertisement from controller to node A
>> Endpoint address=192.0.2.80, color=100, SID-List=<S1, S2>
>> Binding-SID label=1023
>>
>> FEC2)
>> SR Policy advertisement from controller to node A
>> Endpoint address=192.0.2.81, color=100, SID-List=<S3, S4>
>> Binding-SID label=1023
>>
>> FEC1 wins by having the lower numerical endpoint address value. This
>> means that node A
>> installs a transit MPLS forwarding entry to SWAP incoming label=1023,
>> with outgoing labels
>> and outgoing interface determined by the SID-List for FEC1.
>> Node A will generally also install an ingress MPLS forwarding entry
>> corresponding to FEC1 for
>> incoming prefix=192.0.2.80/32 pushing outgoing labels and using the
>> outgoing interface
>> determined by the SID-List for FEC1.
>>
>> The rule in section 2.6 means that node A MUST NOT install an ingress
>> MPLS forwarding entry
>> corresponding to FEC2 ( which would be for incoming prefix=192.0.2.81/32).
>>
>>
>> ========
>>
>> General comment:
>>
>> section 2.6 title:
>> existing:
>> Outgoing Label Collision:
>> proposed:
>> Effect of Incoming Label Collision on Outgoing Label Programming :
>> --------------------------------------
>>
>>
>> Thanks,
>> Chris
>>
>>
>> On Thu, May 24, 2018 at 12:14 PM, <bruno..decraene@orange.com
>> <bruno.decraene@orange.com>> wrote:
>>
>>> Hello Working Group,
>>>
>>>
>>>
>>> This email starts a Working Group Last Call on draft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and ready for a final working group review.
>>>
>>>
>>>
>>> Please read this document if you haven't read the most recent version yet, and send your comments to the list, no later than *June 08*.
>>>
>>>
>>>
>>> As a reminder, this document had already passed a WGLC more than a year ago on version -06 [2], had been sent to the AD but then returned to the WG.
>>>
>>> Since then, the document has significantly changed, so please read it again. In particular, it now includes the resolution in case of incoming label collision. Hence it killed draft-ietf-spring-conflict-resolution.
>>>
>>>
>>>
>>> Both co-chairs co-author this document, hence:
>>>
>>> - Shraddha has agreed to be the document shepherd... Thank you Shraddha.
>>>
>>> - Martin, our AD, has agreed to evaluate the WG consensus.
>>>
>>>
>>>
>>> Thank you,
>>>
>>> Bruno, Rob
>>>
>>>
>>>
>>> [1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13
>>>
>>> [2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y
>>>
>>>
>>>
>>> _________________________________________________________________________________________________________________________
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>>>
>>>
>> _______________________________________________
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>>
>
>
> --
> Przemyslaw "PK" Krol |  Strategic Network Engineer ing | pkrol@google.com
>


-- 
Przemyslaw "PK" Krol |  Strategic Network Engineer ing | pkrol@google.com

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<div dir=3D"ltr">Greetings,<div><br></div><div>In terms of UHP,=C2=A0<a hre=
f=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions=
-16#section-2.1.1">draft-ietf-isis-segment-routing-extensions-16</a>=C2=A0d=
escribes 2 cases:=C2=A0<br></div><div>=C2=A0- P set, E unset</div><div>=C2=
=A0- P set, E set</div><div><br></div><div>However it looks that=C2=A0<a hr=
ef=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#sect=
ion-3.1.2">draft-ietf-spring-segment-routing-15</a>=C2=A0doesn&#39;t make t=
hat distinction and doesn&#39;t seem to cover the latter case:</div><div><b=
r></div><div><div>=C2=A0 =C2=A0o=C2=A0 A remote node M MUST maintain the fo=
llowing FIB entry for any</div><div>=C2=A0 =C2=A0 =C2=A0 learned Prefix-SID=
 SID-R attached to IP prefix R:</div><div><br></div><div>=C2=A0 =C2=A0 =C2=
=A0Incoming Active Segment: SID-R</div><div>=C2=A0 =C2=A0 =C2=A0Ingress Ope=
ration:</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 If the next-hop of R is the o=
riginator of R</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 and instructed to remo=
ve the active segment: NEXT</div><div><b>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Else: =
CONTINUE</b></div><div>=C2=A0 =C2=A0 =C2=A0Egress interface: the interface =
towards the next-hop along the</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0path computed using the al=
gorithm advertised with</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the SID toward prefix R.</div></d=
iv><div><br></div><div><br></div><div>Would it make sense to also describe =
the 2nd option (E+P) given ISIS draft brings this up as a use case?</div><d=
iv><br></div><div>thanks,</div><div>pk</div><div><br></div><div><br></div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Sat, Jun 9, 2018 at=
 12:01 AM Przemyslaw Krol &lt;<a href=3D"mailto:pkrol@google.com">pkrol@goo=
gle.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"=
ltr">Greetings,<div><br></div><div>Few minor, cosmetic/editorial suggestion=
s:</div><div><div><br></div><div><font face=3D"monospace, monospace">2.5. I=
ncoming Label Collision<br></font></div><div><font face=3D"monospace, monos=
pace">[...]</font></div><div><font face=3D"monospace, monospace"><b><font c=
olor=3D"#ff0000">(Endpoint, Color)</font></b> representing an SR policy [I.=
D. filsfils-spring-</font><span style=3D"font-family:monospace,monospace">s=
egment-routing-policy]</span></div></div><div><br></div><div>(Color, Endpoi=
nt) is the ordering used by the policy draft. If the decision is to correct=
 it, there is few references in the draft</div><div><br></div><div><div><fo=
nt face=3D"monospace, monospace">2.5.1. Tie-breaking Rules</font></div></di=
v><div><font face=3D"monospace, monospace">[...]</font></div><div><div><fon=
t face=3D"monospace, monospace">=C2=A0 =C2=A0 =C2=A0 =C2=A0o The Color ID i=
s encoded using <font color=3D"#ff0000"><b>16 bits</b></font></font></div><=
/div><div><font color=3D"#ff0000"><b><br></b></font></div><div><font color=
=3D"#000000">should be 32 bits=C2=A0</font></div><div><font color=3D"#00000=
0">(<a href=3D"https://tools.ietf.org/html/rfc5512#section-4.3.1" target=3D=
"_blank">https://tools.ietf.org/html/rfc5512#section-4.3.1</a> &amp;&amp; <=
a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-pol=
icy-00#section-2.1" target=3D"_blank">https://tools.ietf.org/html/draft-iet=
f-spring-segment-routing-policy-00#section-2.1</a></font><span style=3D"col=
or:rgb(0,0,0)">)</span></div><div><br></div><div><br></div><div><div><font =
face=3D"monospace, monospace">2.6. Outgoing Label Collision</font></div></d=
iv><div><font face=3D"monospace, monospace">[...]</font></div><div><div><fo=
nt face=3D"monospace, monospace">In the general case, the ingress node may =
not have exactly <b><font color=3D"#ff0000"><strike style=3D"margin:0px;pad=
ding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:in=
herit;font-stretch:inherit;line-height:inherit;font-size:15px;vertical-alig=
n:baseline;box-sizing:inherit;text-align:left;background-color:rgb(255,255,=
255)">have</strike></font></b>=C2=A0the=C2=A0</font><span style=3D"font-fam=
ily:monospace,monospace">same data of the receiving node</span></div></div>=
<div><br></div><div><font face=3D"monospace, monospace">2.7. PUSH, CONTINUE=
, and NEXT<br></font></div><div><div><font face=3D"monospace, monospace">PU=
SH, NEXT, and CONTINUE are operations applied by the forwarding=C2=A0</font=
><span style=3D"font-family:monospace,monospace">plan</span><b style=3D"fon=
t-family:monospace,monospace"><font color=3D"#ff0000">e</font></b><span sty=
le=3D"font-family:monospace,monospace">.</span></div></div><div><font face=
=3D"monospace, monospace">[...]</font></div><div><br></div><div><font face=
=3D"monospace, monospace">2.8. MPLS Label downloaded to FIB corresponding t=
o Global and Local SIDs<br></font></div><div><font face=3D"monospace, monos=
pace">[...]</font></div><div><div><font face=3D"monospace, monospace">an IG=
P with SR extensions <font color=3D"#ff0000"><b>[</b></font>I-D.ietf-</font=
><span style=3D"font-family:monospace,monospace">isis-segment-routing-exten=
sions, I-D.ietf-ospf-segment-routing-</span><span style=3D"font-family:mono=
space,monospace">extensions]</span></div></div><div><span style=3D"font-fam=
ily:monospace,monospace"><br></span></div><div>^^^ missing &#39;[&#39; or a=
lternatively both references should be enclosed in their own []</div><div><=
br></div><div><br></div><div>thanks,</div><div>pk</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr">On Fri, Jun 8, 2018 at 11:14 AM Chris Bow=
ers &lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank">chr=
isbowers.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div dir=3D"ltr">SPRING WG,<br><br>I generally support publication of<b=
r>draft-ietf-spring-segment-routing-mpls. However, I think <br>that the tex=
t in sections 2.5 and 2.6 (on incoming label collisions)<br>needs some work=
 before publication. This text was added to <br>the draft a few months ago,=
 and has not gotten much review<br>from the WG as a whole. The review and p=
roposed text below<br>focuses on these sections.<br><br>As I understand the=
 current text of the draft, the general<br>approach to resolving incoming l=
abel collisions seems<br>well-reasoned and complete.=C2=A0 However, it is p=
ossible that <br>my interpretation of these tie-breaking rules is <br>not w=
hat the authors intended.<br><br>I&#39;d like to propose the examples below=
 to be included<br>in the draft to help clarify the tie-breaking rules<br>f=
or incoming label collisions described in section 2.5.<br>I have highlighte=
d several cases in these examples,<br>where I think the rules in section 2.=
5 need<br>to be clarified in order to unambiguously determine <br>the winni=
ng FEC in an example.<br><br>It may also be the case that the authors or ot=
her <br>WG participants will disagree with the interpretation of the <br>ru=
les used to choose a winning FEC in some of these<br>examples.=C2=A0 In tha=
t case, we should discuss<br>what is the correct interpretation, and clarif=
y the <br>text in the draft to make the correct interpretation <br>clear.<b=
r><br><br>Incoming label collision examples<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<=
br><br>Node A<br>OSPF default admin distance for implementation=3D50<br>ISI=
S default admin distance for implementation=3D60<br><br>=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<br>Example incoming label conflict for label=3D1005 on node A<br>=
<br>FEC1)<br>OSPF prefix sid advertisement from node B for <a href=3D"http:=
//198.51.100.5/32" target=3D"_blank">198.51.100.5/32</a> with index=3D5<br>=
OSPF SRGB on node A =3D [1000,1999]<br>Incoming label=3D1005<br><br>FEC2)<b=
r>ISIS prefix sid advertisement from node C for <a href=3D"http://203.0.113=
.105/32" target=3D"_blank">203.0.113.105/32</a> with index=3D5<br>ISIS SRGB=
 on node A =3D [1000,1999] <br>Incoming label=3D1005<br><br>FEC1 and FEC2 b=
oth use dynamic SID assignment.=C2=A0 Since neither of <br>the FEC types is=
 SR Policy, we use the default admin distances of 50<br>and 60 to break the=
 tie.=C2=A0 So FEC1 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example inc=
oming label conflict for label=3D1006 on node A<br><br>FEC1)<br>OSPF prefix=
 sid advertisement from node B for <a href=3D"http://198.51.100.6/32" targe=
t=3D"_blank">198.51.100.6/32</a> with index=3D6<br>OSPF SRGB on node A =3D =
[1000,1999]<br>Incoming label=3D1006<br><br>FEC2)<br>ISIS adjacency sid adv=
ertisement from node A with label=3D1006<br>Incoming label=3D1006<br>Node A=
 allocates this adjacency SID dynamically, <br>and it may differ across rou=
ter reboots.<br><br>FEC1 and FEC2 both use dynamic SID assignment.=C2=A0 Si=
nce neither of <br>the FEC types is SR Policy, we use the default admin dis=
tances of 50<br>and 60 to break the tie.=C2=A0 So FEC1 wins.<br><br>=3D=3D=
=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1007 o=
n node A<br><br>FEC1)<br>OSPF prefix sid advertisement from node B for <a h=
ref=3D"http://198.51.100.7/32" target=3D"_blank">198.51.100.7/32</a> with i=
ndex=3D7<br>OSPF SRGB on node A =3D [1000,1999]<br>Incoming label=3D1007<br=
><br>FEC2)<br>ISIS adjacency sid advertisement from node A with label=3D100=
7<br>Incoming label=3D1007<br>Node A assigns this adjacency SID explicitly =
via configuration, <br>so the adjacency SID survives router reboots.<br><br=
>FEC1 uses dynamic SID assignment, while FEC2 uses explicit SID <br>assignm=
ent. So FEC2 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming l=
abel conflict for label=3D1008 on node A<br><br>FEC1)<br>OSPF prefix sid ad=
vertisement from node B for <a href=3D"http://198.51.100.8/32" target=3D"_b=
lank">198.51.100..8/32</a> with index=3D8<br>OSPF SRGB on node A =3D [1000,=
1999]<br>Incoming label=3D1008<br><br>FEC2)<br>SR Policy advertisement from=
 controller to node A<br>Endpoint =3D 192.0.2.208, color =3D 100, SID-List =
=3D &lt;S1, S2&gt;<br>Binding-SID label =3D 1008<br><br>FEC1 and FEC2 both =
use dynamic SID assignment.=C2=A0 <br>Since one of the FEC types is SR Poli=
cy, default admin<br>distance is not used to break the tie.=C2=A0 <br>/* Th=
e text in Section 2.5.1 needs to be clarified to specify<br>whether SR Poli=
cy always loses or always wins in this case. */<br><br>=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<br>Example incoming label conflict for label=3D1009 on node A<br>=
<br>FEC1)<br>OSPF adjacency sid advertisement by node A with label=3D1009<b=
r>Incoming label=3D1009<br>Node A assigns this adjacency SID explicitly via=
 configuration, <br>so the adjacency SID survives router reboots.<br><br>FE=
C2)<br>ISIS adjacency sid advertisement by node A with label=3D1009<br>Inco=
ming label=3D1009<br>Node A assigns this adjacency SID explicitly via confi=
guration, <br>so the adjacency SID survives router reboots.<br><br>FEC1 and=
 FEC2 both use explicit SID assignment.=C2=A0 This kind of <br>incoming lab=
el collision should never occur, since an <br>implement of explicit SID ass=
ignment MUST guarantee<br>collision freeness on the same router.<br><br>=3D=
=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1010 o=
n node A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a h=
ref=3D"http://203.0.113.110/32" target=3D"_blank">203.0.113.110/32</a> with=
 index=3D10<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1010=
<br><br>FEC2)<br>ISIS adjacency sid advertisement by node A with label=3D10=
10<br>Incoming label=3D1010<br>Node A allocates this adjacency SID dynamica=
lly,<br>and it may differ across router reboots.<br><br>FEC1 and FEC2 both =
use dynamic SID assignment. Since both FECs <br>are from the same MCC, they=
 have the same default admin distance.<br>So we compare FEC type code-point=
.=C2=A0 FEC1 has FEC type <br>code-point=3D120, while FEC2 has FEC type cod=
e-point=3D130.<br>Therefore, FEC1 wins.=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=
=3D=3D<br>Example incoming label conflict for label=3D1011 on node A<br><br=
>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D"http://2=
03.0.113.111/32" target=3D"_blank">203.0.113.111/32</a> with index=3D11<br>=
ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1011<br><br>FEC2)<b=
r>ISIS prefix sid advertisement from node C for 2001:DB8:1000::11/128 with =
index=3D11<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1011<=
br><br>FEC1 and FEC2 both use dynamic SID assignment. Since both FECs <br>a=
re from the same MCC, they have the same default admin distance.<br>So we c=
ompare FEC type code-point.=C2=A0 Both FECs have FEC type <br>code-point=3D=
120. So we compare address family.=C2=A0 Since IPv4 is <br>preferred over I=
Pv6, FEC1 wins.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming labe=
l conflict for label=3D1012 on node A<br><br>FEC1)<br>ISIS prefix sid adver=
tisement from node B for <a href=3D"http://203.0.113.112/32" target=3D"_bla=
nk">203.0.113.112/32</a> with index=3D12<br>ISIS SRGB on node A =3D [1000,1=
999]<br>Incoming label=3D1012<br><br>FEC2)<br>ISIS prefix sid advertisement=
 from node C for <a href=3D"http://203.0.113.128/30" target=3D"_blank">203.=
0.113.128/30</a> with index=3D12<br>ISIS SRGB on node A =3D [1000,1999]<br>=
Incoming label=3D1012<br><br>FEC1 and FEC2 both use dynamic SID assignment.=
 Since both FECs <br>are from the same MCC, they have the same default admi=
n distance.<br>So we compare FEC type code-point.=C2=A0 Both FECs have FEC =
type <br>code-point=3D120. So we compare address family.=C2=A0 Both are IPv=
4 address<br>family, so we compare prefix length.=C2=A0 FEC1 has prefix len=
gth=3D32, <br>and FEC2 has prefix length=3D30, so FEC2 wins.<br><br>=3D=3D=
=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1013 o=
n node A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a h=
ref=3D"http://203.0.113.113/32" target=3D"_blank">203.0.113.113/32</a> with=
 index=3D13<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1013=
<br><br>FEC2)<br>ISIS prefix sid advertisement from node C for <a href=3D"h=
ttp://203.0.113.213/32" target=3D"_blank">203.0.113..213/32</a> with index=
=3D13<br>ISIS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1013<br><b=
r>FEC1 and FEC2 both use dynamic SID assignment. Since both FECs <br>are fr=
om the same MCC, they have the same default admin distance.<br>So we compar=
e FEC type code-point.=C2=A0 Both FECs have FEC type <br>code-point=3D120. =
So we compare address family.=C2=A0 Both are IPv4 address<br>family, so we =
compare prefix length.=C2=A0 Prefix lengths are the same,<br>so we compare =
prefix.=C2=A0 FEC1 has the lower prefix, so FEC1 wins..<br><br>=3D=3D=3D=3D=
=3D=3D=3D=3D=3D<br>Example incoming label conflict for label=3D1014 on node=
 A<br><br>FEC1)<br>ISIS prefix sid advertisement from node B for <a href=3D=
"http://203.0.113.114/32" target=3D"_blank">203.0.113.114/32</a> with index=
=3D14<br>Routing Instance ID =3D 1000<br>ISIS SRGB on node A =3D [1000,1999=
]<br>Incoming label=3D1014<br><br>FEC2)<br>ISIS prefix sid advertisement fr=
om node C for <a href=3D"http://203.0.113.114/32" target=3D"_blank">203.0.1=
13.114/32</a> with index=3D14<br>Routing Instance ID =3D 2000<br>ISIS SRGB =
on node A =3D [1000,1999]<br>Incoming label=3D1014<br><br>These two FECs ma=
tch all the way through the prefix length and prefix. <br>So Routing Instan=
ce ID breaks the tie, with FEC1 winning.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=
<br>Example incoming label conflict for label=3D1015 on node A<br><br>FEC1)=
<br>ISIS prefix sid advertisement from node B for <a href=3D"http://203.0.1=
13.115/32" target=3D"_blank">203.0.113.115/32</a> with index=3D15<br>Routin=
g Instance ID =3D 1000<br>ISIS Multi-topology ID =3D 50<br>ISIS SRGB on nod=
e A =3D [1000,1999]<br>Incoming label=3D1015<br><br>FEC2)<br>ISIS prefix si=
d advertisement from node C for <a href=3D"http://203.0.113.115/32" target=
=3D"_blank">203.0.113.115/32</a> with index=3D15<br>Routing Instance ID =3D=
 1000<br>ISIS Multi-topology ID =3D 40<br>ISIS SRGB on node A =3D [1000,199=
9]<br>Incoming label=3D1015<br><br>These two FECs match all the way through=
 the prefix length, prefix, and <br>Routing Instance ID.=C2=A0 We compare I=
SIS Multi-topology ID, so FEC2 wins.<br><br>/* There appears to be a typo i=
n section 2.5.1, with two different <br>orderings shown for a prefix-based =
FEC: <br>Prefix, Routing Instance, Topology, Algorithm<br>and<br>(Prefix Le=
ngth, Prefix, SR Algorithm, routing_instance_id, Topology)<br>This needs to=
 be corrected. */<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming la=
bel conflict for label=3D1016 on node A<br><br>FEC1)<br>ISIS prefix sid adv=
ertisement from node B for <a href=3D"http://203.0.113.116/32" target=3D"_b=
lank">203.0.113.116/32</a> with index=3D16<br>Routing Instance ID =3D 1000<=
br>ISIS Multi-topology ID =3D 50<br>SR algorithm =3D 0<br>ISIS SRGB on node=
 A =3D [1000,1999]<br>Incoming label=3D1016<br><br>FEC2)<br>ISIS prefix sid=
 advertisement from node C for <a href=3D"http://203.0.113.116/32" target=
=3D"_blank">203..0.113.116/32</a> with index=3D16<br>Routing Instance ID =
=3D 1000<br>ISIS Multi-topology ID =3D 50<br>SR algorithm =3D 22<br>ISIS SR=
GB on node A =3D [1000,1999]<br>Incoming label=3D1016<br><br>These two FECs=
 match all the way through the prefix length, prefix, and <br>Routing Insta=
nce ID, and Multi-topology ID. We compare SR algorithm ID, so<br>FEC1 wins.=
<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for =
label=3D1017 on node A<br><br>FEC1)<br>ISIS prefix sid advertisement from n=
ode B for <a href=3D"http://203.0.113.117/32" target=3D"_blank">203.0.113.1=
17/32</a> with index=3D17<br>ISIS SRGB on node A =3D [1000,1999]<br>Incomin=
g label=3D1017<br><br>FEC2)<br>ISIS mapping server advertisement (SID/Label=
 Binding TLV) from node D:<br>Range=3D100, Prefix =3D <a href=3D"http://203=
.0.113.1/32" target=3D"_blank">203.0.113.1/32</a><br>This mapping server ad=
vertisment generates 100 mappings, one of which <br>maps <a href=3D"http://=
203.0.113.17/32" target=3D"_blank">203.0.113.17/32</a> to index=3D17.<br>IS=
IS SRGB on node A =3D [1000,1999]<br>Incoming label=3D1017<br><br>The fact =
that FEC1 comes from a normal prefix sid advertisement and <br>FEC2 is gene=
rated from a mapping server advertisement is not <br>used as a tie-breaking=
 parameter. Both FECs use dynamic SID assignment,<br>are from the same MCC,=
 have the same FEC type code-point=3D120. Their prefix<br>lengths are the s=
ame as well.=C2=A0 FEC2 wins based on lower numerical prefix value,<br>sinc=
e 203.0.113.17 is less than 203.0.113.117.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D<br>Example incoming label conflict for label=3D1018 on node A<br><br>FE=
C1)<br>ISIS IPv4 adjacency sid advertisement from node A with label=3D1018<=
br>corresponding to next-hop interface address=3D192.0.2.100, outgoing inte=
rface ID=3D5<br>Incoming label=3D1018<br>Node A allocates this adjacency SI=
D dynamically, <br>and it may differ across router reboots.<br><br>FEC2)<br=
>ISIS IPv6 adjacency sid advertisement from node A with label=3D1018<br>cor=
responding to 2001:DB8:2000::100/128, outgoing interface ID=3D6.<br>Incomin=
g label=3D1018<br>Node A allocates this adjacency SID dynamically, <br>and =
it may differ across router reboots.<br><br>Both FECs use dynamic SID assig=
nment, are from the same MCC,<br>and have the same FEC type code-point=3D13=
0.=C2=A0 FEC1 wins <br>because IPv4 address family is preferred over IPv6.<=
br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label conflict for l=
abel=3D1019 on node A<br><br>FEC1)<br>ISIS IPv4 adjacency sid advertisement=
 from node A with label=3D1019<br>corresponding to next-hop interface addre=
ss=3D192.0.2.220, outgoing interface ID=3D7<br>Incoming label=3D1019<br>Nod=
e A allocates this adjacency SID dynamically, <br>and it may differ across =
router reboots.<br><br>FEC2)<br>ISIS IPv4 adjacency sid advertisement from =
node A with label=3D1019<br>corresponding to next-hop interface address=3D1=
92.0.2.230, outgoing interface ID=3D8<br>Incoming label=3D1019<br>Node A al=
locates this adjacency SID dynamically, <br>and it may differ across router=
 reboots.<br><br>Both FECs use dynamic SID assignment, are from the same MC=
C,<br>and have the same FEC type code-point=3D130. Both FECs have to <br>sa=
me address family.=C2=A0 FEC1 wins based on having the lowest next-hop<br>i=
nterface address.=C2=A0 <br><br>/* It is not clear how to construct an exam=
ple that <br>would result in using the outgoing interface ID as a tie-break=
er.<br>It would be useful to understand why this is and clarify <br>it in t=
he text. */<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Example incoming label confli=
ct for label=3D1020 on node A<br><br>FEC1)<br>SR Policy advertisement from =
controller to node A<br>Endpoint address=3D2001:DB8:3000::100, color=3D100,=
 SID-List=3D&lt;S1, S2&gt;<br>Binding-SID label=3D1020<br><br>FEC2)<br>SR P=
olicy advertisement from controller to node A<br>Endpoint address=3D192.0.2=
.60, color=3D100, SID-List=3D&lt;S3, S4&gt;<br>Binding-SID label=3D1020<br>=
<br>The FECs match through the tie-breaks up to and including<br>having the=
 same FEC type code-point=3D140.<br>FEC2 wins based on IPv4 address family =
being preferred<br>over IPv6.=C2=A0=C2=A0 <br><br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D<br>Example incoming label conflict for label=3D1021 on node A<br><br>FE=
C1)<br>SR Policy advertisement from controller to node A<br>Endpoint addres=
s=3D192.0.2.70, color=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-SID label=
=3D1021<br><br>FEC2)<br>SR Policy advertisement from controller to node A<b=
r>Endpoint address=3D192.0.2.71, color=3D100, SID-List=3D&lt;S3, S4&gt;<br>=
Binding-SID label=3D1021<br><br>The FECs match through the tie-breaks up to=
 and including<br>having the same address family. FEC1 wins by having the <=
br>lower numerical endpoint address value.<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=
=3D<br><br>I&#39;d like to propose the examples below to be included<br>in =
the draft to help clarify section 2.6 <br>(currently entitled &quot;Outgoin=
g Label Collision&quot;).<br><br><br>Examples of the Effect Incoming Label =
Collision on Outgoing Label Programming<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D<br><br>Example of effect of incoming label collision for label=3D1022<b=
r>on outgoing label programming on node A<br><br>FEC1)<br>ISIS prefix sid a=
dvertisement from node B for <a href=3D"http://203.0.113.122/32" target=3D"=
_blank">203.0.113.122/32</a> with index=3D22<br>ISIS SRGB on node A =3D [10=
00,1999]<br>Incoming label=3D1022<br><br>FEC2)<br>ISIS prefix sid advertise=
ment from node C for <a href=3D"http://203.0.113.222/32" target=3D"_blank">=
203.0.113.222/32</a> with index=3D22<br>ISIS SRGB on node A =3D [1000,1999]=
<br>Incoming label=3D1022<br><br>FEC1 wins based on lowest numerical prefix=
 value.=C2=A0 This means that node A<br>installs a transit MPLS forwarding =
entry to SWAP incoming label=3D1022, with outgoing label N, <br>and use out=
going interace I. N is determined by the index associated with FEC1 (index=
=3D22) and <br>the SRGB advertised by the next-hop node on the shortest pat=
h to reach<br><a href=3D"http://203.0.113.122/32" target=3D"_blank">203.0.1=
13.122/32</a>. <br><br>Node A will generally also install an ingress MPLS f=
orwarding entry corresponding to FEC1 for <br>incoming prefix=3D<a href=3D"=
http://203.0.113.122/32" target=3D"_blank">203.0.113.122/32</a> pushing out=
going label N, and using outgoing interace I.<br><br>The rule in section 2.=
6 means that node A MUST NOT install an ingress MPLS forwarding entry <br>c=
orresponding to FEC2 ( which would be for incoming prefix=3D<a href=3D"http=
://203.0.113.222/32" target=3D"_blank">203.0.113.222/32</a>).=C2=A0 <br>=3D=
=3D=3D=3D=3D=3D=3D=3D<br><br>Example of effect of incoming label collision =
for label=3D1023<br>on outgoing label programming on node A<br><br>FEC1)<br=
>SR Policy advertisement from controller to node A<br>Endpoint address=3D19=
2.0.2.80, color=3D100, SID-List=3D&lt;S1, S2&gt;<br>Binding-SID label=3D102=
3<br><br>FEC2)<br>SR Policy advertisement from controller to node A<br>Endp=
oint address=3D192.0.2.81, color=3D100, SID-List=3D&lt;S3, S4&gt;<br>Bindin=
g-SID label=3D1023<br><br>FEC1 wins by having the lower numerical endpoint =
address value. This means that node A<br>installs a transit MPLS forwarding=
 entry to SWAP incoming label=3D1023, with outgoing labels <br>and outgoing=
 interface determined by the SID-List for FEC1. <br>Node A will generally a=
lso install an ingress MPLS forwarding entry corresponding to FEC1 for <br>=
incoming prefix=3D<a href=3D"http://192.0.2.80/32" target=3D"_blank">192.0.=
2.80/32</a> pushing outgoing labels and using the outgoing interface <br>de=
termined by the SID-List for FEC1. <br><br>The rule in section 2.6 means th=
at node A MUST NOT install an ingress MPLS forwarding entry <br>correspondi=
ng to FEC2 ( which would be for incoming prefix=3D<a href=3D"http://192.0.2=
.81/32" target=3D"_blank">192.0.2.81/32</a>).=C2=A0 <br><br>=3D=3D=3D=3D=3D=
=3D=3D=3D<br><br>General comment:<br><br>section 2.6 title:<br>existing:<br=
>Outgoing Label Collision:<br>proposed:<br>Effect of Incoming Label Collisi=
on on Outgoing Label Programming :<br><div>--------------------------------=
------</div><div><br></div><div><br></div><div>Thanks,</div><div>Chris<br><=
/div><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, =
May 24, 2018 at 12:14 PM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:bruno.de=
craene@orange.com" target=3D"_blank">bruno..decraene@orange.com</a>&gt;</sp=
an> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"FR">
<div class=3D"m_1877191715287325971m_-5217648212762046684gmail-m_-798715545=
9334438273WordSection1">
<pre><span lang=3D"EN-US">Hello Working Group,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and =
ready for a final working group review.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven&#39;t read=
 the most recent version yet, and send your comments to the list, no later =
than *June 08*.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-resolution.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<u>=
</u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
... Thank you Shraddha.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">=C2=A0=C2=A0=C2=A0 <u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Thank you,<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<u></u><u></u></span></pre>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"EN-US">[1] <a href=3D"https://tools.ietf.org/html/draft-=
ietf-spring-segment-routing-mpls-13" target=3D"_blank">https://tools.ietf.o=
rg/html/draft-ietf-spring-segment-routing-mpls-13</a><u></u><u></u></span><=
/pre>
<pre><span lang=3D"EN-US">[2] <a href=3D"https://mailarchive.ietf.org/arch/=
msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y" target=3D"_blank">https://mailarchi=
ve.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><u></u><u></u></=
span></pre>
<pre><span style=3D"font-family:&quot;Arial&quot;,&quot;sans-serif&quot;" l=
ang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
</div>
<pre>______________________________________________________________________=
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nature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div style=
=3D"padding-top:10px;margin-top:10px"><table cellspacing=3D"0" cellpadding=
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;font-size:small"><td style=3D"border-top-style:solid;border-top-color:rgb(=
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tyle=3D"border-top-style:solid;border-top-color:rgb(51,105,232);border-top-=
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style=3D"border-top-style:solid;border-top-color:rgb(213,15,37);border-top-=
width:2px">Przemyslaw &quot;PK&quot; Krol |</td><td style=3D"border-top-sty=
le:solid;border-top-color:rgb(51,105,232);border-top-width:2px">=C2=A0Strat=
egic Network Engineer</td><td style=3D"border-top-style:solid;border-top-co=
lor:rgb(0,153,57);border-top-width:2px"><span style=3D"line-height:19px;whi=
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m-color:rgb(51,105,232);border-left-color:rgb(51,105,232);padding-top:2px;m=
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-width:0px;border-bottom-width:0px;border-left-width:0px;border-top-style:s=
olid;border-right-style:solid;border-bottom-style:solid;border-left-style:s=
olid;border-top-color:rgb(0,153,57);border-right-color:rgb(0,153,57);border=
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Content-Type: text/plain; charset="UTF-8"

Sasha,

1. Where did I say it is a requirement ? My quote was precise and it
clearly said that this is recommended.

2. Nothing in this thread requires use of domain-wide labels. All required
functionality will work just fine with domain-wide indexes - so even we I
or anyone one else said here anything about "domain-wide labels" fell free
to substitute it with "domain-wide index" if this will make you happy.

3. To constructively move fwd let me propose we drop SR-MPLS all together
from support of spray or fan-out functionality in the charter and just make
sure charter reflect such support for SRv6 only. Now let's sit and watch
how the proponents of index based offset instead of global SRGB will react
if MPLS based network will miss such useful functionality :)

Cheers,
R.



On Sat, Jun 9, 2018 at 8:53 PM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Robert,
>
> I think that you have cut the quoted text from the Segment Routing
> Architecture
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft
> a bit too short. The complete fragment says:
>
>
>
>    Where possible, it is recommended that identical SRGBs be configured
>
>    on all nodes in an SR Domain.  This simplifies troubleshooting as the
>
>    same label will be associated with the same prefix on all nodes.  In
>
>    addition, it simplifies support for anycast as detailed in
>
>    Section 3.3
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#section-3.3>
> .
>
>
>
> In other words,  the Segment Routing Architecture draft:
>
> -          Does not consider identical SRGBs on all nodes in an SR domain
> as a requirement.
>
> -          Explains that such configuration, if used, simplifies
> troubleshooting and support of anycast segments. With regard to the latter,
> please note that the Anycast Segments
> <https://tools.ietf.org/html/draft-ietf-spring-mpls-anycast-segments-02>
> draft defines a mechanism that facilitates usage of anycast segments in an
> environment with different SRGBs on different nodes.
>
>
>
> Therefore, from my POV, domain-wide labels have been purged (for quite
> some time now) from the SR-MPLS architecture. I do not think that they
> should be re-introduced.
>
>
>
> My 2c,
>
> Sasha
>

--000000000000fcfde2056e3ad37f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" =
style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Sasha,</di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-f=
amily:arial,helvetica,sans-serif;font-size:small">1. Where did I say it is =
a requirement ? My quote was precise and it clearly said that this is recom=
mended.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default=
" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">2. Nothi=
ng in this thread requires use of domain-wide labels. All required function=
ality will work just fine with domain-wide indexes - so even we I or anyone=
 one else said here anything about &quot;domain-wide labels&quot; fell free=
 to substitute it with &quot;domain-wide index&quot; if this will make you =
happy.</div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">3. To construct=
ively move fwd let me propose we drop SR-MPLS all together from support of =
spray or fan-out functionality in the charter and just make sure charter re=
flect such support for SRv6 only. Now let&#39;s sit and watch how the propo=
nents of index based offset instead of global SRGB will react if MPLS based=
 network will miss such useful functionality :)=C2=A0</div><div class=3D"gm=
ail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small">Cheers,</div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small">R.</div><di=
v class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;f=
ont-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family=
:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_=
extra"><br><div class=3D"gmail_quote">On Sat, Jun 9, 2018 at 8:53 PM, Alexa=
nder Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:Alexander.Vainshtei=
n@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ecitele.com</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-6933988745536088849WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Robert,<u></u><u></u></span></p><span=
 class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I think that you have cut the quoted =
text from the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15=
" target=3D"_blank">Segment Routing Architecture</a> draft a bit too short.=
 The complete fragment says:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">=C2=A0=C2=A0 Where possible, it is
<span style=3D"background:yellow">recommended</span> that identical SRGBs b=
e configured<u></u><u></u></span></p>
</span><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&=
quot;Courier New&quot;;color:black">=C2=A0=C2=A0 on all nodes in an SR Doma=
in.=C2=A0
<span style=3D"background:yellow">This simplifies troubleshooting as the<u>=
</u><u></u></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow">=C2=A0=C2=A0 same label will=
 be associated with the same prefix on all nodes.=C2=A0 In<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow">=C2=A0=C2=A0 addition, it si=
mplifies support for anycast as detailed in<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow">=C2=A0=C2=A0
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15=
#section-3.3" target=3D"_blank">
Section 3.3</a>.</span><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">In other words, =C2=A0the Segment Rou=
ting Architecture draft:<u></u><u></u></span></p>
<p class=3D"m_-6933988745536088849MsoListParagraph"><u></u><span style=3D"f=
ont-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><=
span>-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Does no=
t consider identical SRGBs on all nodes in an SR domain as a requirement.<u=
></u><u></u></span></p>
<p class=3D"m_-6933988745536088849MsoListParagraph"><u></u><span style=3D"f=
ont-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><=
span>-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Explain=
s that such configuration, if used, simplifies troubleshooting and support =
of anycast segments. With regard to the latter,
 please note that the <a href=3D"https://tools.ietf.org/html/draft-ietf-spr=
ing-mpls-anycast-segments-02" target=3D"_blank">
Anycast Segments</a> draft defines a mechanism that facilitates usage of an=
ycast segments in an environment with different SRGBs on different nodes.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0</span><span style=3D"co=
lor:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:11pt">=C2=A0</s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Therefore, from my POV, domain-wide l=
abels have been purged (for quite some time now) from the SR-MPLS architect=
ure. I do not think that they should be re-introduced.<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">My 2c,<u></u><u></u></span></p><span =
class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha</span></p></span></div></div></=
blockquote></div></div></div>

--000000000000fcfde2056e3ad37f--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Robert Raszuk <robert@raszuk.net>
CC: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>,  Michael McBride <michael.mcbride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Paul Mattes <pamattes@microsoft.com>, "Zafar Ali (zali)" <zali@cisco.com>, Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
Thread-Topic: [spring] Updating the SPRING WG Charter
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From: Robert Raszuk <robert@raszuk.net>
Date: Sun, 10 Jun 2018 11:58:18 +0200
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Subject: Re: [spring] Updating the SPRING WG Charter
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--00000000000033524e056e46ac2f
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Hey Sasha,

100% agree with your last post. Very glad to see your support for
spray/fan-out or if you will
static MDTs to be in scope of SPRING.

Based on number of WG members input expressed both at the meeting and on
the list  I hope
proposed SPRING charter will be updated soon to reflect that.

Cheers,
R.

=E2=80=8BPS. Btw - I am also ok that ingress replication is not relevant to=
 SPRING
as it essentially happens at the
ingress to the domain. =E2=80=8B



On Sun, Jun 10, 2018 at 7:39 AM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Robert,
>
> First of all, I did not say that your quote was inaccurate. I apologize
> for possible misperception.
>
>
>
> Second, I believe that spray or fan-out (meaning support of externally
> computed static MDTs) in SR-MPLS is a relevant focus area for the future =
WG
> work. Of course the solution must be aligned with the SPRING and MPLS
> architecture, and this imposes additional restrictions on how such a
> solution would look.
>
>
>
> Last but not least, I have differentiated (from my first email on this
> thread) *ingress replication* *in SR* from the more generic *multicast
> support *in SR:
>
> -          The latter is quite acceptable to me
>
> -          The former, IMHO, should be left out of scope.
>
>
>
> Hope this helps to clarify my position.
>
> Regards, and, again, apologies for possible misinterpretation.
>
>
>
> Sasha
>

--00000000000033524e056e46ac2f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hey Sasha,<br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
<br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small">100% agree with your last post. Very glad to s=
ee your support for spray/fan-out or if you will=C2=A0</div><div class=3D"g=
mail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sma=
ll">static MDTs to be in scope of SPRING.=C2=A0</div><div class=3D"gmail_de=
fault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br=
></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif;font-size:small">Based on number of WG members input expressed bot=
h at the meeting and on the list=C2=A0 I hope</div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">propo=
sed SPRING charter will be updated soon to reflect that.=C2=A0</div><div cl=
ass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-=
size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:ari=
al,helvetica,sans-serif;font-size:small">Cheers,<br>R.</div><div class=3D"g=
mail_extra"><br></div><div class=3D"gmail_extra"><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=
=8BPS. Btw - I am also ok that ingress replication is not relevant to SPRIN=
G as it essentially happens at the=C2=A0</div><div class=3D"gmail_default" =
style=3D"font-family:arial,helvetica,sans-serif;font-size:small">ingress to=
 the domain. =E2=80=8B</div><br></div><div class=3D"gmail_extra"><br></div>=
<div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Jun 10, 2=
018 at 7:39 AM, Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexander.Vainshtein@=
ecitele.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_8781384223204297339WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Robert,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">First of all, I did not say that your=
 quote was inaccurate. I apologize for possible misperception.<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Second, I believe that spray or fan-o=
ut (meaning support of externally computed static MDTs) in SR-MPLS is a rel=
evant focus area for the future WG work. Of course
 the solution must be aligned with the SPRING and MPLS architecture, and th=
is imposes additional restrictions on how such a solution would look.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Last but not least, I have differenti=
ated (from my first email on this thread)
<b><i>ingress replication</i></b> <b>in SR</b> from the more generic <b>mul=
ticast support
</b>in SR:<u></u><u></u></span></p>
<p class=3D"m_8781384223204297339MsoListParagraph"><u></u><span style=3D"fo=
nt-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><s=
pan>-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The lat=
ter is quite acceptable to me<u></u><u></u></span></p>
<p class=3D"m_8781384223204297339MsoListParagraph"><u></u><span style=3D"fo=
nt-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><s=
pan>-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-si=
ze:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The for=
mer, IMHO, should be left out of scope.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Hope this helps to clarify my positio=
n.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards, and, again, apologies for po=
ssible misinterpretation.<u></u><u></u></span></p><span class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha</span></p></span></div></div></=
blockquote></div></div></div>

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--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D8F434FD9dggemm512mbxchi_--


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The following errata report has been verified for RFC7855,
"Source Packet Routing in Networking (SPRING) Problem Statement and Requirements". 

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5385

--------------------------------------
Status: Verified
Type: Editorial

Reported by: James Bensley <jwbensley@gmail.com>
Date Reported: 2018-06-08
Verified by: RFC Editor  

Section: 1

Original Text
-------------
   Hence, the policy is instantiated in the packet header and does not
   requires any policy state in midpoints and tail-ends.

Corrected Text
--------------
   Hence, the policy is instantiated in the packet header and does not
   require any policy state in midpoints and tail-ends.

Notes
-----
require/requires - singular/plural.
Verifier Notes: subject/verb agreement error.

--------------------------------------
RFC7855 (draft-ietf-spring-problem-statement-08)
--------------------------------------
Title               : Source Packet Routing in Networking (SPRING) Problem Statement and Requirements
Publication Date    : May 2016
Author(s)           : S. Previdi, Ed., C. Filsfils, Ed., B. Decraene, S. Litkowski, M. Horneffer, R. Shakir
Category            : INFORMATIONAL
Source              : Source Packet Routing in Networking
Area                : Routing
Stream              : IETF


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From: "Bernier, Daniel" <daniel.bernier@bell.ca>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>
CC: SPRING WG List <spring@ietf.org>, Linda Dunbar <linda.dunbar@huawei.com>,  "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Mon, 11 Jun 2018 13:30:12 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-segment-routing-policy
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Subject: Re: [spring] Working Group Adoption Call for draft-filsfils-spring-segment-routing-policy
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-mpls-14.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing with MPLS data plane
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Stefano Previdi
                          Bruno Decraene
                          Stephane Litkowski
                          Rob Shakir
	Filename        : draft-ietf-spring-segment-routing-mpls-14.txt
	Pages           : 25
	Date            : 2018-06-11

Abstract:
   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through a controlled set of instructions, called
   segments, by prepending the packet with an SR header.  In the MPLS
   dataplane, the SR header is instantiated through a label stack. This
   document specifies the forwarding behavior to allow instantiating SR
   over the MPLS dataplane.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-mpls-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-mpls-14


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
To: adrian@olddog.co.uk, bruno.decraene@orange.com, 'SPRING WG List' <spring@ietf.org>
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
References: <28960_1527182067_5B06F2F3_28960_194_1_53C29892C857584299CBF5D05346208A47A53592@OPEXCLILM21.corporate.adroot.infra.ftgroup> <00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk>
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Thanks a lot for the through review

I posted version 14 few minutes ago to address your comments

See my reply as #Ahmed


On 5/25/18 2:22 AM, Adrian Farrel wrote:
>
> Hi,
>
> I think it is well past time that we completed this foundation work
>
> and got an RFC published. So I support passing this draft to the AD
>
> again.
>
> However, we do need to clean it up first. Hopefully this won't be a
>
> lot of effort for the editors as nearly all I found were editorial
>
> nits.
>
> As a side comment, it isn't a success that section 2.5 is so large.
>
> Full one quarter of the document is dedicated to the edge case of
>
> collision avoidance. That said, I don't have a better solution.
>
> Thanks for the work.
>
> Adrian
>
> ====
>
> idnits isn't as clean as it could be. In particular:
>
> - 2.5.2.1 uses IP address 1.1.1.1 and should pick one from RFC 6890.
>
> - Missing normative reference for RFC 8174
>
> - [I-D.ietf-idr-segment-routing-te-policy] is not used
>
> - [I-D.ietf-ospf-ospfv3-segment-routing-extensions] and
>
> [I-D.ietf-ospf-segment-routing-extensions] have spurious spaces in
>
> the filenames
>
#Ahmed: Fixed
>

> ---
>
> You'll need to move the "Requirements Language" to be Section 1.1.
>
#Ahmed: Moved it to section 1.1
>
> ---
>
> Section 2
>
> s/link State IGPs/link state IGPs/
>
> s/Segment ID (SIDs)/Segment IDs (SIDs)/
>
#Ahmed: Fixed
>
> ---
>
> You use SRGB in 2.2 before you expand it in 2.3
>
#Ahmed: I expanded it at the beginning of Section 2.2
>
> ---
>
> 2.2
>
> oThe label value MUST be unique within the router on which the MCC
>
> is running. i.e. the label MUST only be used to represent the SID.
>
> I don't think you mean this. You have written that the label value has
>
> be unique which means that only one label value can be assigned to a
>
> SID.
>
> I think what you mean is that
>
> oThe label value MUST NOT be used for any other purpose on the
>
> router on which the MCC is running. I.e. the label MUST NOT be
>
> used to represent more than one SID or for any other forwarding
>
> purpose on the router.
>
#Ahmed: I used a slightly different wording than what you suggested. 
Here it is
The label value MUST be unique within the router on which the MCC is 
running. i.e. the label MUST only be used to represent the SID and MUST 
NOT be used to represent more than one SID or for any other forwarding 
purpose on the router.
>
> ---
>
> 2.2
>
> Unusual to have a normative reference to an IANA URL as you have for
>
> [reserved-MPLS]. Besides, the URL you give is 404.
>
> You would do better to reference RFC 7274.
>
#Ahmed: Agreed and done
>
> You might also fix the language and terminology, thus...
>
> OLD
>
> oThe label value MUST NOT be identical to or within the range of
>
> any reserved label value or range [reserved-MPLS], respectively.
>
> NEW
>
> oThe label value MUST NOT come from the range of special purpose
>
> labels [RFC7274].
>
#Ahmed: Agreed and done
>
> ---
>
> 2.3 ditto
>
> OLD
>
> oEvery range in the list of ranges specifying the SRGB MUST NOT
>
> cover or overlap with a reserved label value or range [reserved-
>
> MPLS], respectively.
>
> NEW
>
> oEvery range in the list of ranges specifying the SRGB MUST NOT
>
> cover or overlap with the range of special purpose labels
>
> [RFC7274].
>
#Ahmed: Agreed and Done
>
> ---
>
> 2.3
>
> oIf the SRGB of a node does not conform to the structure specified
>
> in this section or to the previous two rules, then this SRGB is
>
> completely ignored and the node is treated as if it does not have
>
> an SRGB.
>
> Can we fix this passive voice? Presume the intention is that the
>
> advertisement of this SRGB is ignored by any routing protocol speakers
>
> that receive it.
>
> Two points of clarification I think we should add:
>
> 1. The *whole* SRGB is ignored, not simply the range of labels in a set
>
> of ranges that is at fault
>
> 2. The term "ignore" in this case means that no SR action is taken, but
>
> the SRGB advertisement continues to be propagated within the routing
>
> protocol.
>
#Ahmed: the section defines the SRGB as a single entity consisting of a 
list of label ranges. Hence the SRGB is not divisible. The document 
clearly specifies what "ignore" means by saying "and the node is treated 
as if it does not have an SRGB.". How a routing protocol advertises the 
SRGB (e.g. by flooding, leaking between levels/areas) is beyond the 
scope of this document. I modified the statement slightly to indicate 
what does it mean "ignored"
>
> ---
>
> 2.3 (bottom of page 5)
>
> s/reserved label/special purpose label/
>
#Ahmed: renamed "reserved label" to special purpose label through out 
the document as you s
>
> ---
>
> 2.3
>
> s/contiguous range of label/contiguous range of labels/
>
#Ahmed: Done
>
> ---
>
> 2.5
>
> s/(e.g.,over/(e.g., over/
>
> s/map to the same incoming/maps to the same incoming/
>
> s/FECk} maps to the same/FECk} map to the same/
>
> s/non-zero algo/non-zero algorithm/
>
#Ahmed: Corrected or removed the statement containing the typo
>
> ---
>
> 2.5.1
>
> The plural of FEC is FECs not FEC's
>
#Ahmed: corrected the 3 occurrences
>
> ---
>
> 2.5.1
>
> 2. if more than one competing FEC remains after step 1, sort them and
>
> select the smallest numerical FEC value
>
> Is sorting required? Can we just have...
>
> 2. if more than one competing FEC remains after step 1, select the
>
> smallest numerical FEC value
>
#Ahmed: Agreed and modified accordingly
>
> ---
>
> 2.5.1
>
> An implementation may choose to implement additional
>
> s/may/MAY/
>
#Ahmed: Agreed and modified accordingly
>
> ---
>
> 2.5.2
>
> s/THEN/then/
>
#Ahmed: Agreed and modified accordingly
>
> ---
>
> 2.7
>
> s/plan./plane./
>
#Ahmed: Agreed and modified accordingly
>
> ---
>
> Terminology for adjacency SIDs needs to be harmonised.
>
> draft-ietf-spring-segment-routing has "IGP-Adjacency Segment" and
>
> "Adj-SID"
>
> This document has:
>
> adjacency SID (2.5.1)
>
> Adj-SID (2.7.3)
>
> adj-SID (2.7.3)
>
> IGP-adjacency-SID (2.8)
>
> IGP-Adj-SID (2.11.1)
>
> IGP adj-SID (2.11.2)
>
  #Ahmed: I changed all of them to adj-SID
>
> ---
>
> Some of the section names are overly long and can be cut down without
>
> risking much. This helps with layout and readability. Just a suggestion,
>
> but...
>
> OLD
>
> 2.1. Supporting Multiple Forwarding Behaviors for the Same Prefix
>
> 2.8. MPLS Label downloaded to FIB corresponding to Global and Local SIDs
>
> 2.10.1. Forwarding Behavior for PUSH and CONTINUE Operation for Global 
> SIDs
>
> 2.10.2. Forwarding Behavior for NEXT Operation for Global SIDs
>
> 2.11.1. Forwarding Behavior Corresponding to PUSH Operation on Local SIDs
>
> 2.11.2. Forwarding Behavior Corresponding to CONTINUE Operation for 
> Local SIDs
>
> NEW
>
> 2.1. Multiple Forwarding Behaviors for the Same Prefix
>
> 2.8. MPLS Label Downloaded to FIB for Global and Local SIDs
>
> 2.10.1. Forwarding for PUSH and CONTINUE of Global SIDs
>
> 2.10.2. Forwarding for NEXT Operation for Global SIDs
>
> 2.11.1. Forwarding for PUSH Operation on Local SIDs
>
> 2.11.2. Forwarding for CONTINUE Operation for Local SIDs
>
#Ahmed: Thanks for the advice. Modified as suggested
>
> ---
>
> For some reason the definite article is missing before a lot of
>
> instances of "FIB". For example, in 2.8...
>
> The label corresponding to the global SID "Si" represented by the
>
> global index "I" downloaded to FIB is used to match packets whose
>
> ---
>
> 2.10
>
> OLD
>
> This section specifies forwarding behavior, including the outgoing
>
> label(s) calculations corresponding to a global SID when applying
>
> PUSH, CONTINUE, and NEXT operations in the MPLS forwarding plane.
>
> This document covers the calculation of outgoing label for the top
>
> label only. The case where outgoing label is not the top label and is
>
> part of a stack of labels that instantiates a routing policy or a
>
> traffic engineering tunnel is covered in other documents such as
>
> [I.D.filsfils-spring-segment-routing-policy].
>
> NEW
>
> This section specifies forwarding behavior, including the calculation
>
> of outgoing labels, that corresponds to a global SID when applying
>
> PUSH, CONTINUE, and NEXT operations in the MPLS forwarding plane.
>
> This document covers the calculation of the outgoing label for the
>
> top label only. The case where the outgoing label is not the top
>
> label and is part of a stack of labels that instantiates a routing
>
> policy or a traffic engineering tunnel is covered in other documents
>
> such as [I.D.filsfils-spring-segment-routing-policy].
>
#Ahmed: Modified as suggested
>
> ---
>
> 2.10.1
>
> s/{RFC3031]/[RFC3031]/
>
> ---
>
> 2.10.2 has
>
> oApply the instruction associated with the incoming label prior to
>
> popping
>
> This is a little ambiguous. Might be read that the instruction should be
>
> applied prior to popping. The text that follows des clarify, but perhaps
>
> rewrite as...
>
> oApply the instruction associated with the incoming label that has
>
> been popped
>
#Ahmed: Agreed and modified accordingly
>
> ---
>
> In order that ECMP descriptions work in the examples, Section 3 just
>
> needs a quick comment like.
>
> All links in this example have the same IGP metric.
>
#Ahmed: Added a phrase to the end of the second sentence in the section
>
> ---
>
> While it is largely OK to defer the discussion of manageability in
>
> Section 5 to draft-ietf-spring-segment-routing, it would make sense
>
> to make explicit reference to RFC 8287 because that is the key document
>
> that means no further OAM discussion is needed in this document.
>
> Probably just copy in the following paragraph
>
> SR OAM use cases for the MPLS data plane are defined in
>
> [I-D.ietf-spring-oam-usecase].SR OAM procedures for the MPLS data
>
> plane are defined in [RFC8287].
>
#Ahmed. Copied
>
> ---
>
> 8.
>
> Possibly Himanshu would prefer to be named as "Himanshu Shah".
>
#Ahmed: Thanks for catching that :)
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of 
> *bruno.decraene@orange.com
> *Sent:* 24 May 2018 18:14
> *To:* SPRING WG List
> *Cc:* draft-ietf-spring-segment-routing-mpls@ietf.org
> *Subject:* [spring] WG Last Call for 
> draft-ietf-spring-segment-routing-mpls-13
>
> Hello Working Group,
> This email starts a Working Group Last Call on 
> draft-ietf-spring-segment-routing-mpls-13 [1] which is considered 
> mature and ready for a final working group review.
> Please read this document if you haven't read the most recent version 
> yet, and send your comments to the list, no later than *June 08*.
> As a reminder, this document had already passed a WGLC more than a 
> year ago on version -06 [2], had been sent to the AD but then returned 
> to the WG.
> Since then, the document has significantly changed, so please read it 
> again. In particular, it now includes the resolution in case of 
> incoming label collision. Hence it killed 
> draft-ietf-spring-conflict-resolution.
> Both co-chairs co-author this document, hence:
> - Shraddha has agreed to be the document shepherd.. Thank you Shraddha.
> - Martin, our AD, has agreed to evaluate the WG consensus.
> Thank you,
> Bruno, Rob
> [1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13
> [2] 
> https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y
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    <p>Thanks a lot for the through review</p>
    <p>I posted version 14 few minutes ago to address your comments<br>
    </p>
    <p>See my reply as #Ahmed<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 5/25/18 2:22 AM, Adrian Farrel
      wrote:<br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Hi,<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">I think it is well past time
            that we completed this foundation work<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">and got an RFC published. So
            I support passing this draft to the AD<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">again.<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">However, we do need to clean
            it up first. Hopefully this won't be a<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">lot of effort for the editors
            as nearly all I found were editorial <o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">nits.<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">As a side comment, it isn't a
            success that section 2.5 is so large. <o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Full one quarter of the
            document is dedicated to the edge case of<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">collision avoidance. That
            said, I don't have a better solution.<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Thanks for the work.<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Adrian<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">====<o:p></o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
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style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
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            could be. In particular:<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">- 2.5.2.1 uses IP address
            1.1.1.1 and should pick one from RFC 6890.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">- Missing normative reference
            for RFC 8174<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">-
            [I-D.ietf-idr-segment-routing-te-policy] is not used<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">-
            [I-D.ietf-ospf-ospfv3-segment-routing-extensions] and<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">  </span>[I-D.ietf-ospf-segment-routing-extensions]
            have spurious spaces in<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">  </span>the filenames<o:p></o:p></span></p>
      </div>
    </blockquote>
    #Ahmed: Fixed<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
      </div>
    </blockquote>
    <br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">You'll need to move the
            "Requirements Language" to be Section 1.1.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
      </div>
    </blockquote>
    #Ahmed: Moved it to section 1.1<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Section 2<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/link State IGPs/link state
            IGPs/<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/Segment ID (SIDs)/Segment
            IDs (SIDs)/</span></p>
      </div>
    </blockquote>
    #Ahmed: Fixed<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">You use SRGB in 2.2 before
            you expand it in 2.3</span></p>
      </div>
    </blockquote>
    #Ahmed: I expanded it at the beginning of Section 2.2<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.2<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"> <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>The label value MUST be
            unique within the router on which the MCC<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>is running. i.e.
            the label MUST only be used to represent the SID.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">I don't think you mean this.
            You have written that the label value has <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">be unique which means that
            only one label value can be assigned to a<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">SID.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">I think what you mean is that
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>The label value MUST
            NOT be used for any other purpose on the <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>router on which the
            MCC is running. I.e. the label MUST NOT be <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>used to represent
            more than one SID or for any other forwarding<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>purpose on the
            router.<o:p></o:p></span></p>
      </div>
    </blockquote>
    #Ahmed: I used a slightly different wording than what you suggested.
    Here it is<br>
    The label value MUST be unique within the router on which the MCC is
    running. i.e. the label MUST only be used to represent the SID and
    MUST NOT be used to represent more than one SID or for any other
    forwarding purpose on the router.<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.2<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Unusual to have a normative
            reference to an IANA URL as you have for<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">[reserved-MPLS]. Besides, the
            URL you give is 404.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">You would do better to
            reference RFC 7274.</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and done<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">You might also fix the
            language and terminology, thus...<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">OLD<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>The label value MUST
            NOT be identical to or within the range of<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>any reserved label
            value or range [reserved-MPLS], respectively.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">NEW<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>The label value MUST
            NOT come from the range of special purpose<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>labels [RFC7274].</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and done<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.3 ditto<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">OLD<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>Every range in the list
            of ranges specifying the SRGB MUST NOT<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>cover or overlap
            with a reserved label value or range [reserved-<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>MPLS],
            respectively.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">NEW<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>Every range in the list
            of ranges specifying the SRGB MUST NOT<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>cover or overlap
            with the range of special purpose labels <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>[RFC7274].</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and Done<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.3<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>If the SRGB of a node
            does not conform to the structure specified<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>in this section or
            to the previous two rules, then this SRGB is<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>completely ignored
            and the node is treated as if it does not have<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>an SRGB.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Can we fix this passive
            voice? Presume the intention is that the <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">advertisement of this SRGB is
            ignored by any routing protocol speakers<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">that receive it.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Two points of clarification I
            think we should add:<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">1. The *whole* SRGB is
            ignored, not simply the range of labels in a set<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>of ranges that is at
            fault<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2. The term "ignore" in this
            case means that no SR action is taken, but<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>the SRGB advertisement
            continues to be propagated within the routing<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>protocol.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
      </div>
    </blockquote>
    #Ahmed: the section defines the SRGB as a single entity consisting
    of a list of label ranges. Hence the SRGB is not divisible. The
    document clearly specifies what "ignore" means by saying "and the
    node is treated as if it does not have an SRGB.". How a routing
    protocol advertises the SRGB (e.g. by flooding, leaking between
    levels/areas) is beyond the scope of this document. I modified the
    statement slightly to indicate what does it mean "ignored"<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.3 (bottom of page 5)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/reserved label/special
            purpose label/</span></p>
      </div>
    </blockquote>
    #Ahmed: renamed "reserved label" to special purpose label through
    out the document as you s
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.3<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/contiguous range of
            label/contiguous range of labels/</span></p>
      </div>
    </blockquote>
    #Ahmed: Done<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.5<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/(e.g.,over/(e.g., over/<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/map to the same
            incoming/maps to the same incoming/<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/FECk} maps to the
            same/FECk} map to the same/<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/non-zero algo/non-zero
            algorithm/</span></p>
      </div>
    </blockquote>
    #Ahmed: Corrected or removed the statement containing the typo<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.5.1<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">The plural of FEC is FECs not
            FEC's</span></p>
      </div>
    </blockquote>
    #Ahmed: corrected the 3 occurrences<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.5.1<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>2. if more than one
            competing FEC remains after step 1, sort them and<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>select the smallest
            numerical FEC value<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Is sorting required? Can we
            just have...<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>2. if more than one
            competing FEC remains after step 1, select the <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>smallest numerical
            FEC value</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and modified accordingly<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.5.1<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">An implementation may choose
            to implement additional<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/may/MAY/</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and modified accordingly<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.5.2<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/THEN/then/</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and modified accordingly
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.7<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/plan./plane./</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and modified accordingly
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Terminology for adjacency
            SIDs needs to be harmonised.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">draft-ietf-spring-segment-routing
            has "IGP-Adjacency Segment" and <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">"Adj-SID"<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">This document has:<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">adjacency SID (2.5.1)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Adj-SID (2.7.3)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">adj-SID (2.7.3)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">IGP-adjacency-SID (2.8)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">IGP-Adj-SID (2.11.1)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">IGP adj-SID (2.11.2)</span></p>
      </div>
    </blockquote>
     #Ahmed: I changed all of them to adj-SID<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Some of the section names are
            overly long and can be cut down without<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">risking much. This helps with
            layout and readability. Just a suggestion,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">but...<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">OLD<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.1. Supporting Multiple
            Forwarding Behaviors for the Same Prefix<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.8. MPLS Label downloaded to
            FIB corresponding to Global and Local SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.1. Forwarding Behavior
            for PUSH and CONTINUE Operation for Global SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.2. Forwarding Behavior
            for NEXT Operation for Global SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.11.1. Forwarding Behavior
            Corresponding to PUSH Operation on Local SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.11.2. Forwarding Behavior
            Corresponding to CONTINUE Operation for Local SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">NEW<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.1. Multiple Forwarding
            Behaviors for the Same Prefix<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.8. MPLS Label Downloaded to
            FIB for Global and Local SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.1. Forwarding for PUSH
            and CONTINUE of Global SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.2. Forwarding for NEXT
            Operation for Global SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.11.1. Forwarding for PUSH
            Operation on Local SIDs<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.11.2. Forwarding for
            CONTINUE Operation for Local SIDs</span></p>
      </div>
    </blockquote>
    #Ahmed: Thanks for the advice. Modified as suggested<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">For some reason the definite
            article is missing before a lot of<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">instances of "FIB". For
            example, in 2.8...<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>The label
            corresponding to the global SID "Si" represented by the<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>global index "I"
            downloaded to FIB is used to match packets whose<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">OLD<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>This section specifies
            forwarding behavior, including the outgoing<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>label(s) calculations
            corresponding to a global SID when applying<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>PUSH, CONTINUE, and
            NEXT operations in the MPLS forwarding plane.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>This document covers
            the calculation of outgoing label for the top<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>label only. The case
            where outgoing label is not the top label and is<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>part of a stack of
            labels that instantiates a routing policy or a<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>traffic engineering
            tunnel is covered in other documents such as<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>[I.D.filsfils-spring-segment-routing-policy].<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">NEW<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>This section specifies
            forwarding behavior, including the calculation<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>of outgoing labels,
            that corresponds to a global SID when applying<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>PUSH, CONTINUE, and
            NEXT operations in the MPLS forwarding plane.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>This document covers
            the calculation of the outgoing label for the <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>top label only. The
            case where the outgoing label is not the top <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>label and is part of a
            stack of labels that instantiates a routing<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>policy or a traffic
            engineering tunnel is covered in other documents<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>such as
            [I.D.filsfils-spring-segment-routing-policy].</span></p>
      </div>
    </blockquote>
    #Ahmed: Modified as suggested<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.1<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">s/{RFC3031]/[RFC3031]/<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">2.10.2 has<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>Apply the instruction
            associated with the incoming label prior to<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>popping<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">This is a little ambiguous.
            Might be read that the instruction should be<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">applied prior to popping. The
            text that follows des clarify, but perhaps<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">rewrite as...<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>o<span
              style="mso-spacerun:yes">  </span>Apply the instruction
            associated with the incoming label that has<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">      </span>been popped</span></p>
      </div>
    </blockquote>
    #Ahmed: Agreed and modified accordingly<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">In order that ECMP
            descriptions work in the examples, Section 3 just<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">needs a quick comment like.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>All links in this
            example have the same IGP metric.</span></p>
      </div>
    </blockquote>
    #Ahmed: Added a phrase to the end of the second sentence in the
    section<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">While it is largely OK to
            defer the discussion of manageability in <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Section 5 to
            draft-ietf-spring-segment-routing, it would make sense<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">to make explicit reference to
            RFC 8287 because that is the key document<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">that means no further OAM
            discussion is needed in this document.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Probably just copy in the
            following paragraph<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>SR OAM use cases for
            the MPLS data plane are defined in<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>[I-D.ietf-spring-oam-usecase].<span
              style="mso-spacerun:yes">  </span>SR OAM procedures for
            the MPLS data<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><span
              style="mso-spacerun:yes">   </span>plane are defined in
            [RFC8287].</span></p>
      </div>
    </blockquote>
    #Ahmed. Copied<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">---<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">8.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D">Possibly Himanshu would
            prefer to be named as "Himanshu Shah".</span></p>
      </div>
    </blockquote>
    #Ahmed: Thanks for catching that :)<br>
    <blockquote type="cite"
      cite="mid:00e601d3f409$f3b5b050$db2110f0$@olddog.co.uk">
      <div class="WordSection1">
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times
            New Roman&quot;;color:#1F497D"><o:p> </o:p></span></p>
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
          0cm 0cm 4.0pt">
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times
                    New
                    Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language:EN-GB"
                    lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times
                  New
                  Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language:EN-GB"
                  lang="EN-US"> spring [<a class="moz-txt-link-freetext"
                    href="mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
                  <b>On Behalf Of </b><a
                    class="moz-txt-link-abbreviated"
                    href="mailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a><br>
                  <b>Sent:</b> 24 May 2018 18:14<br>
                  <b>To:</b> SPRING WG List<br>
                  <b>Cc:</b> <a class="moz-txt-link-abbreviated"
                    href="mailto:draft-ietf-spring-segment-routing-mpls@ietf.org">draft-ietf-spring-segment-routing-mpls@ietf.org</a><br>
                  <b>Subject:</b> [spring] WG Last Call for
                  draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p> </o:p></p>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Hello Working Group,<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">    <o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">This email starts a Working Group Last Call on draft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and ready for a final working group review.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">    <o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Please read this document if you haven't read the most recent version yet, and send your comments to the list, no later than *June 08*.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">As a reminder, this document had already passed a WGLC more than a year ago on version -06 [2], had been sent to the AD but then returned to the WG.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Since then, the document has significantly changed, so please read it again. In particular, it now includes the resolution in case of incoming label collision. Hence it killed draft-ietf-spring-conflict-resolution.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Both co-chairs co-author this document, hence:<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">- Shraddha has agreed to be the document shepherd.. Thank you Shraddha.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">- Martin, our AD, has agreed to evaluate the WG consensus.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">    <o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Thank you,<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">Bruno, Rob<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">[1] <a href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13" moz-do-not-send="true">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13</a><o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:EN-US" lang="EN-US">[2] <a href="https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y" moz-do-not-send="true">https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><o:p></o:p></span></pre>
          <pre><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-ansi-language:EN-US" lang="EN-US"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">_________________________________________________________________________________________________________________________<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR"><o:p> </o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">This message and its attachments may contain confidential or privileged information that may be protected by law;<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">they should not be distributed, used or copied without authorisation.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">If you have received this email in error, please notify the sender and delete this message and its attachments.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.<o:p></o:p></span></pre>
          <pre><span style="mso-ansi-language:FR" lang="FR">Thank you.<o:p></o:p></span></pre>
        </div>
      </div>
    </blockquote>
    <br>
  </body>
</html>

--------------64261ADBBC5577D41E50AB62--


From nobody Mon Jun 11 21:46:25 2018
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing Policy Architecture
        Authors         : Clarence Filsfils
                          Siva Sivabalan
                          Daniel Voyer
                          Alex Bogdanov
                          Paul Mattes
	Filename        : draft-ietf-spring-segment-routing-policy-01.txt
	Pages           : 33
	Date            : 2018-06-11

Abstract:
   Segment Routing (SR) allows a headend node to steer a packet flow
   along any path.  Intermediate per-flow states are eliminated thanks
   to source routing.  The headend node steers a flow into an SR Policy.
   The header of a packet steered in an SR Policy is augmented with an
   ordered list of segments associated with that SR Policy.  This
   document details the concepts of SR Policy and steering into an SR
   Policy.



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There are also htmlized versions available at:
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From nobody Tue Jun 12 02:53:26 2018
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Ahmed Bashandy'" <abashandy.ietf@gmail.com>
Cc: <draft-ietf-spring-segment-routing-mpls@ietf.org>, <bruno.decraene@orange.com>, "'SPRING WG List'" <spring@ietf.org>
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Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
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Good work, Ahmed.
 
Very many thanks for the changes and for the clear response to my review.
 
Best,
Adrian
 
From: Ahmed Bashandy [mailto:abashandy.ietf@gmail.com] 
Sent: 11 June 2018 22:55
To: adrian@olddog.co.uk; bruno.decraene@orange.com; 'SPRING WG List'
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
 
Thanks a lot for the through review
I posted version 14 few minutes ago to address your comments
See my reply as #Ahmed
 
On 5/25/18 2:22 AM, Adrian Farrel wrote:
Hi,
 
I think it is well past time that we completed this foundation work
and got an RFC published. So I support passing this draft to the AD
again.
 
However, we do need to clean it up first. Hopefully this won't be a
lot of effort for the editors as nearly all I found were editorial 
nits.
 
As a side comment, it isn't a success that section 2.5 is so large. 
Full one quarter of the document is dedicated to the edge case of
collision avoidance. That said, I don't have a better solution.
 
Thanks for the work.
 
Adrian
 
====
 
idnits isn't as clean as it could be. In particular:
- 2.5.2.1 uses IP address 1.1.1.1 and should pick one from RFC 6890.
- Missing normative reference for RFC 8174
- [I-D.ietf-idr-segment-routing-te-policy] is not used
- [I-D.ietf-ospf-ospfv3-segment-routing-extensions] and
  [I-D.ietf-ospf-segment-routing-extensions] have spurious spaces in
  the filenames
#Ahmed: Fixed


 



---
 
You'll need to move the "Requirements Language" to be Section 1.1.
 
#Ahmed: Moved it to section 1.1


---
 
Section 2
s/link State IGPs/link state IGPs/
s/Segment ID (SIDs)/Segment IDs (SIDs)/
#Ahmed: Fixed


 
---
 
You use SRGB in 2.2 before you expand it in 2.3
#Ahmed: I expanded it at the beginning of Section 2.2


 
---
 
2.2
   o  The label value MUST be unique within the router on which the MCC
      is running. i.e. the label MUST only be used to represent the SID.
 
I don't think you mean this. You have written that the label value has 
be unique which means that only one label value can be assigned to a
SID.
 
I think what you mean is that 
 
   o  The label value MUST NOT be used for any other purpose on the 
      router on which the MCC is running. I.e. the label MUST NOT be 
      used to represent more than one SID or for any other forwarding
      purpose on the router.
#Ahmed: I used a slightly different wording than what you suggested. Here it is
The label value MUST be unique within the router on which the MCC is running.
i.e. the label MUST only be used to represent the SID and MUST NOT be used to
represent more than one SID or for any other forwarding purpose on the router.


 
---
 
2.2
 
Unusual to have a normative reference to an IANA URL as you have for
[reserved-MPLS]. Besides, the URL you give is 404.
 
You would do better to reference RFC 7274.
#Ahmed: Agreed and done


 
You might also fix the language and terminology, thus...
 
OLD
   o  The label value MUST NOT be identical to or within the range of
      any reserved label value or range [reserved-MPLS], respectively.
NEW
   o  The label value MUST NOT come from the range of special purpose
      labels [RFC7274].
#Ahmed: Agreed and done


 
---
 
2.3 ditto
 
OLD
   o  Every range in the list of ranges specifying the SRGB MUST NOT
      cover or overlap with a reserved label value or range [reserved-
      MPLS], respectively.
NEW
   o  Every range in the list of ranges specifying the SRGB MUST NOT
      cover or overlap with the range of special purpose labels 
      [RFC7274].
#Ahmed: Agreed and Done


 
---
 
2.3
 
   o  If the SRGB of a node does not conform to the structure specified
      in this section or to the previous two rules, then this SRGB is
      completely ignored and the node is treated as if it does not have
      an SRGB.
 
Can we fix this passive voice? Presume the intention is that the 
advertisement of this SRGB is ignored by any routing protocol speakers
that receive it.
 
Two points of clarification I think we should add:
 
1. The *whole* SRGB is ignored, not simply the range of labels in a set
   of ranges that is at fault
 
2. The term "ignore" in this case means that no SR action is taken, but
   the SRGB advertisement continues to be propagated within the routing
   protocol.
 
#Ahmed: the section defines the SRGB as a single entity consisting of a list of
label ranges. Hence the SRGB is not divisible. The document clearly specifies
what "ignore" means by saying "and the node is treated as if it does not have an
SRGB.". How a routing protocol advertises the SRGB (e.g. by flooding, leaking
between levels/areas) is beyond the scope of this document. I modified the
statement slightly to indicate what does it mean "ignored"


---
 
2.3 (bottom of page 5)
 
s/reserved label/special purpose label/
#Ahmed: renamed "reserved label" to special purpose label through out the
document as you s 
 
---
 
2.3
s/contiguous range of label/contiguous range of labels/
#Ahmed: Done


 
---
 
2.5
s/(e.g.,over/(e.g., over/
s/map to the same incoming/maps to the same incoming/
s/FECk} maps to the same/FECk} map to the same/
s/non-zero algo/non-zero algorithm/
#Ahmed: Corrected or removed the statement containing the typo


 
---
 
2.5.1
The plural of FEC is FECs not FEC's
#Ahmed: corrected the 3 occurrences


 
---
 
2.5.1
 
   2. if more than one competing FEC remains after step 1, sort them and
      select the smallest numerical FEC value
 
Is sorting required? Can we just have...
 
   2. if more than one competing FEC remains after step 1, select the 
      smallest numerical FEC value
#Ahmed: Agreed and modified accordingly


 
---
 
2.5.1
An implementation may choose to implement additional
s/may/MAY/
#Ahmed: Agreed and modified accordingly


 
---
 
2.5.2
s/THEN/then/
#Ahmed: Agreed and modified accordingly 
 
---
 
2.7
s/plan./plane./
#Ahmed: Agreed and modified accordingly 
 
---
 
Terminology for adjacency SIDs needs to be harmonised.
 
draft-ietf-spring-segment-routing has "IGP-Adjacency Segment" and 
"Adj-SID"
 
This document has:
adjacency SID (2.5.1)
Adj-SID (2.7.3)
adj-SID (2.7.3)
IGP-adjacency-SID (2.8)
IGP-Adj-SID (2.11.1)
IGP adj-SID (2.11.2)
 #Ahmed: I changed all of them to adj-SID


---
 
Some of the section names are overly long and can be cut down without
risking much. This helps with layout and readability. Just a suggestion,
but...
 
OLD
2.1. Supporting Multiple Forwarding Behaviors for the Same Prefix
2.8. MPLS Label downloaded to FIB corresponding to Global and Local SIDs
2.10.1. Forwarding Behavior for PUSH and CONTINUE Operation for Global SIDs
2.10.2. Forwarding Behavior for NEXT Operation for Global SIDs
2.11.1. Forwarding Behavior Corresponding to PUSH Operation on Local SIDs
2.11.2. Forwarding Behavior Corresponding to CONTINUE Operation for Local SIDs
NEW
2.1. Multiple Forwarding Behaviors for the Same Prefix
2.8. MPLS Label Downloaded to FIB for Global and Local SIDs
2.10.1. Forwarding for PUSH and CONTINUE of Global SIDs
2.10.2. Forwarding for NEXT Operation for Global SIDs
2.11.1. Forwarding for PUSH Operation on Local SIDs
2.11.2. Forwarding for CONTINUE Operation for Local SIDs
#Ahmed: Thanks for the advice. Modified as suggested


 
---
 
For some reason the definite article is missing before a lot of
instances of "FIB". For example, in 2.8...
 
   The label corresponding to the global SID "Si" represented by the
   global index "I" downloaded to FIB is used to match packets whose
 
---
 
2.10
OLD
   This section specifies forwarding behavior, including the outgoing
   label(s) calculations corresponding to a global SID when applying
   PUSH, CONTINUE, and NEXT operations in the MPLS forwarding plane.
 
   This document covers the calculation of outgoing label for the top
   label only. The case where outgoing label is not the top label and is
   part of a stack of labels that instantiates a routing policy or a
   traffic engineering tunnel is covered in other documents such as
   [I.D.filsfils-spring-segment-routing-policy].
NEW
   This section specifies forwarding behavior, including the calculation
   of outgoing labels, that corresponds to a global SID when applying
   PUSH, CONTINUE, and NEXT operations in the MPLS forwarding plane.
 
   This document covers the calculation of the outgoing label for the 
   top label only. The case where the outgoing label is not the top 
   label and is part of a stack of labels that instantiates a routing
   policy or a traffic engineering tunnel is covered in other documents
   such as [I.D.filsfils-spring-segment-routing-policy].
#Ahmed: Modified as suggested


 
---
 
2.10.1
s/{RFC3031]/[RFC3031]/
 
---
 
2.10.2 has
 
   o  Apply the instruction associated with the incoming label prior to
      popping
 
This is a little ambiguous. Might be read that the instruction should be
applied prior to popping. The text that follows des clarify, but perhaps
rewrite as...
 
   o  Apply the instruction associated with the incoming label that has
      been popped
#Ahmed: Agreed and modified accordingly


 
---
 
In order that ECMP descriptions work in the examples, Section 3 just
needs a quick comment like.
 
   All links in this example have the same IGP metric.
#Ahmed: Added a phrase to the end of the second sentence in the section


 
---
 
While it is largely OK to defer the discussion of manageability in 
Section 5 to draft-ietf-spring-segment-routing, it would make sense
to make explicit reference to RFC 8287 because that is the key document
that means no further OAM discussion is needed in this document.
 
Probably just copy in the following paragraph
 
   SR OAM use cases for the MPLS data plane are defined in
   [I-D.ietf-spring-oam-usecase].  SR OAM procedures for the MPLS data
   plane are defined in [RFC8287].
#Ahmed. Copied


 
---
 
8.
 
Possibly Himanshu would prefer to be named as "Himanshu Shah".
#Ahmed: Thanks for catching that :)


 
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of
bruno.decraene@orange.com
Sent: 24 May 2018 18:14
To: SPRING WG List
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-13
 
Hello Working Group,
    
This email starts a Working Group Last Call on
draft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and
ready for a final working group review.
    
Please read this document if you haven't read the most recent version yet, and
send your comments to the list, no later than *June 08*.
 
As a reminder, this document had already passed a WGLC more than a year ago on
version -06 [2], had been sent to the AD but then returned to the WG.
Since then, the document has significantly changed, so please read it again. In
particular, it now includes the resolution in case of incoming label collision.
Hence it killed draft-ietf-spring-conflict-resolution.
 
Both co-chairs co-author this document, hence:
- Shraddha has agreed to be the document shepherd.. Thank you Shraddha.
- Martin, our AD, has agreed to evaluate the WG consensus.
    
Thank you,
Bruno, Rob
 
[1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13
[2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y
 
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UnhideWhenUsed=3D"false" Name=3D"Light Grid Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium Shading 1 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium List 1 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium List 2 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium Grid 1 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium Grid 2 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Medium Grid 3 Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Dark List Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Colorful Shading Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Colorful List Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Colorful Grid Accent 1"/>
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UnhideWhenUsed=3D"false" Name=3D"Light Grid Accent 2"/>
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<w:LsdException Locked=3D"false" Priority=3D"67" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"69" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"70" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"73" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"60" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"62" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"67" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"69" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"71" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"68" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"69" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"70" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"71" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"72" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"73" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"60" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Light Shading Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"62" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Light Grid Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium Shading 1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"65" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium List 1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium List 2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium Grid 1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium Grid 2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Medium Grid 3 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Dark List Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"71" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Colorful Shading Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Colorful List Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" SemiHidden=3D"false" =
UnhideWhenUsed=3D"false" Name=3D"Colorful Grid Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"21" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"31" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"32" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"33" SemiHidden=3D"false" =
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<w:LsdException Locked=3D"false" Priority=3D"37" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" QFormat=3D"true" =
Name=3D"TOC Heading"/>
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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-GB link=3Dblue vlink=3Dpurple =
style=3D'tab-interval:36.0pt'><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Good work, Ahmed.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Very many thanks for the changes and for the clear =
response to my review.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Best,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Adrian<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-ascii-font-family:Calibri;mso-fareast-font-family:Calibri;ms=
o-hansi-font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New =
Roman";color:windowtext;mso-ansi-language:EN-US;mso-fareast-language:EN-G=
B'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New =
Roman";color:windowtext;mso-ansi-language:EN-US;mso-fareast-language:EN-G=
B'> Ahmed Bashandy [mailto:abashandy.ietf@gmail.com] <br><b>Sent:</b> 11 =
June 2018 22:55<br><b>To:</b> adrian@olddog.co.uk; =
bruno.decraene@orange.com; 'SPRING WG List'<br><b>Cc:</b> =
draft-ietf-spring-segment-routing-mpls@ietf.org<br><b>Subject:</b> Re: =
[spring] WG Last Call for =
draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></span></p></div></di=
v><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p>Thanks a lot for the =
through review<o:p></o:p></p><p>I posted version 14 few minutes ago to =
address your comments<o:p></o:p></p><p>See my reply as =
#Ahmed<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-font-family:"Times New =
Roman"'><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal><span =
style=3D'mso-fareast-font-family:"Times New Roman"'>On 5/25/18 2:22 AM, =
Adrian Farrel wrote:<o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Hi,</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>I think it is well past time that we completed this =
foundation work</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>and =
got an RFC published. So I support passing this draft to the =
AD</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>again.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>However, we do need to clean it up first. Hopefully =
this won't be a</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>lot =
of effort for the editors as nearly all I found were editorial =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>nits.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>As a side comment, it isn't a success that section =
2.5 is so large. </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>Full =
one quarter of the document is dedicated to the edge case =
of</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>collision avoidance. That said, I don't have a =
better solution.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Thanks for the work.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Adrian</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>=3D=3D=3D=3D</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>idnits isn't as clean as it could be. In =
particular:</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>- =
2.5.2.1 uses IP address 1.1.1.1 and should pick one from RFC =
6890.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>- =
Missing normative reference for RFC 8174</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>- [I-D.ietf-idr-segment-routing-te-policy] is not =
used</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>- =
[I-D.ietf-ospf-ospfv3-segment-routing-extensions] =
and</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp; =
</span>[I-D.ietf-ospf-segment-routing-extensions] have spurious spaces =
in</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp; </span>the =
filenames</span><o:p></o:p></p></blockquote><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Fixed<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'><br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>---</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>You'll need to move the &quot;Requirements =
Language&quot; to be Section 1.1.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Moved it to section 1.1<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>---</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Section 2</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/link State IGPs/link state =
IGPs/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/Segment ID (SIDs)/Segment IDs =
(SIDs)/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Fixed<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>You use SRGB in 2.2 before you expand it in =
2.3</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: I expanded it at the =
beginning of Section 2.2<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.2</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>o<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>The label value MUST be unique =
within the router on which the MCC</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>is =
running. i.e. the label MUST only be used to represent the =
SID.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>I don't think you mean this. You have written that =
the label value has </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>be =
unique which means that only one label value can be assigned to =
a</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>SID.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>I think what you mean is that =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>o<span style=3D'mso-spacerun:yes'>&nbsp; </span>The label value =
MUST NOT be used for any other purpose on the </span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>rou=
ter on which the MCC is running. I.e. the label MUST NOT be =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>use=
d to represent more than one SID or for any other =
forwarding</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>purpose =
on the router.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: I used a slightly different =
wording than what you suggested. Here it is<br>The label value MUST be =
unique within the router on which the MCC is running. i.e. the label =
MUST only be used to represent the SID and MUST NOT be used to represent =
more than one SID or for any other forwarding purpose on the router.<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.2</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Unusual to have a normative reference to an IANA URL =
as you have for</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>[reserved-MPLS]. Besides, the URL you give is =
404.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>You would do better to reference RFC =
7274.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and done<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>You might also fix the language and terminology, =
thus...</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>OLD</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>o<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>The label value MUST NOT be =
identical to or within the range of</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>any =
reserved label value or range [reserved-MPLS], =
respectively.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>NEW</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>o<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>The label value MUST NOT come =
from the range of special purpose</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>labels =
[RFC7274].</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and done<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.3 ditto</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>OLD</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>o<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>Every range in the list of =
ranges specifying the SRGB MUST NOT</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>cover =
or overlap with a reserved label value or range =
[reserved-</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>MPLS], =
respectively.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>NEW</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>o<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>Every range in the list of =
ranges specifying the SRGB MUST NOT</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>cover =
or overlap with the range of special purpose labels =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>[RF=
C7274].</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and Done<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.3</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>o<span style=3D'mso-spacerun:yes'>&nbsp; </span>If the SRGB of a =
node does not conform to the structure specified</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>in this =
section or to the previous two rules, then this SRGB =
is</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span>completely ignored and the node is treated as if it does not =
have</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>an =
SRGB.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Can we fix this passive voice? Presume the intention =
is that the </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>advertisement of this SRGB is ignored by any routing =
protocol speakers</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>that =
receive it.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Two points of clarification I think we should =
add:</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>1. The *whole* SRGB is ignored, not simply the range =
of labels in a set</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>of ranges that is at =
fault</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2. The term &quot;ignore&quot; in this case means =
that no SR action is taken, but</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>the SRGB advertisement continues to be propagated within the =
routing</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>protocol.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: the section defines the SRGB =
as a single entity consisting of a list of label ranges. Hence the SRGB =
is not divisible. The document clearly specifies what &quot;ignore&quot; =
means by saying &quot;and the node is treated as if it does not have an =
SRGB.&quot;. How a routing protocol advertises the SRGB (e.g. by =
flooding, leaking between levels/areas) is beyond the scope of this =
document. I modified the statement slightly to indicate what does it =
mean &quot;ignored&quot;<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>---</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.3 (bottom of page 5)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/reserved label/special purpose =
label/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: renamed &quot;reserved =
label&quot; to special purpose label through out the document as you s =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.3</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/contiguous range of label/contiguous range of =
labels/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Done<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.5</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/(e.g.,over/(e.g., over/</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/map to the same incoming/maps to the same =
incoming/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/FECk} maps to the same/FECk} map to the =
same/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/non-zero algo/non-zero =
algorithm/</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Corrected or removed the =
statement containing the typo<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.5.1</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>The plural of FEC is FECs not =
FEC's</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: corrected the 3 =
occurrences<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.5.1</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>2. if more than one competing FEC remains after step 1, sort them =
and</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
style=3D'mso-spacerun:yes'>&nbsp;</span>select the smallest numerical =
FEC value</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Is sorting required? Can we just =
have...</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>2. if more than one competing FEC remains after step 1, select =
the </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>sma=
llest numerical FEC value</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and modified =
accordingly<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.5.1</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>An implementation may choose to implement =
additional</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/may/MAY/</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and modified =
accordingly<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.5.2</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/THEN/then/</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and modified =
accordingly <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.7</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/plan./plane./</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and modified =
accordingly <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Terminology for adjacency SIDs needs to be =
harmonised.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>draft-ietf-spring-segment-routing has =
&quot;IGP-Adjacency Segment&quot; and </span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&quot;Adj-SID&quot;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>This document has:</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>adjacency SID (2.5.1)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Adj-SID (2.7.3)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>adj-SID (2.7.3)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>IGP-adjacency-SID (2.8)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>IGP-Adj-SID (2.11.1)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>IGP adj-SID (2.11.2)</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>&nbsp;#Ahmed: I changed all of them =
to adj-SID<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>---</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Some of the section names are overly long and can be =
cut down without</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>risking much. This helps with layout and =
readability. Just a suggestion,</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>but...</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>OLD</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>2.1. =
Supporting Multiple Forwarding Behaviors for the Same =
Prefix</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>2.8. =
MPLS Label downloaded to FIB corresponding to Global and Local =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.1. Forwarding Behavior for PUSH and CONTINUE =
Operation for Global SIDs</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.2. Forwarding Behavior for NEXT Operation for =
Global SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.11.1. Forwarding Behavior Corresponding to PUSH =
Operation on Local SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.11.2. Forwarding Behavior Corresponding to =
CONTINUE Operation for Local SIDs</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>NEW</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>2.1. =
Multiple Forwarding Behaviors for the Same =
Prefix</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>2.8. =
MPLS Label Downloaded to FIB for Global and Local =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.1. Forwarding for PUSH and CONTINUE of Global =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.2. Forwarding for NEXT Operation for Global =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.11.1. Forwarding for PUSH Operation on Local =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.11.2. Forwarding for CONTINUE Operation for Local =
SIDs</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Thanks for the advice. =
Modified as suggested<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>For some reason the definite article is missing =
before a lot of</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>instances of &quot;FIB&quot;. For example, in =
2.8...</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>The label corresponding to the global SID &quot;Si&quot; =
represented by the</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>global index =
&quot;I&quot; downloaded to FIB is used to match packets =
whose</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>OLD</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>This section specifies =
forwarding behavior, including the outgoing</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>label(s) calculations corresponding to a global SID when =
applying</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>PUSH, CONTINUE, and NEXT =
operations in the MPLS forwarding plane.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>This document covers the calculation of outgoing label for the =
top</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>label only. The case =
where outgoing label is not the top label and is</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>part of a stack of labels that instantiates a routing policy or =
a</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>traffic engineering =
tunnel is covered in other documents such as</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>[I.D.filsfils-spring-segment-routing-policy].</span><o:p></o:p></p=
><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>NEW</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>This section specifies forwarding behavior, including the =
calculation</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>of outgoing labels, that =
corresponds to a global SID when applying</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>PUSH, CONTINUE, and NEXT operations in the MPLS forwarding =
plane.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>This document covers the calculation of the outgoing label for =
the </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;</span>top label only. The =
case where the outgoing label is not the top </span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;</span>label and is part of =
a stack of labels that instantiates a routing</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>policy or a traffic engineering tunnel is covered in other =
documents</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>such as =
[I.D.filsfils-spring-segment-routing-policy].</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Modified as suggested<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.1</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>s/{RFC3031]/[RFC3031]/</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>2.10.2 has</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>o<span style=3D'mso-spacerun:yes'>&nbsp; </span>Apply the =
instruction associated with the incoming label prior =
to</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span>popping</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>This is a little ambiguous. Might be read that the =
instruction should be</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>applied prior to popping. The text that follows des =
clarify, but perhaps</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>rewrite as...</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>o<span style=3D'mso-spacerun:yes'>&nbsp; </span>Apply the =
instruction associated with the incoming label that =
has</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>been =
popped</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Agreed and modified =
accordingly<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>In order that ECMP descriptions work in the =
examples, Section 3 just</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>needs =
a quick comment like.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>All links in this example have the same IGP =
metric.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Added a phrase to the end of =
the second sentence in the section<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>While it is largely OK to defer the discussion of =
manageability in </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Section 5 to draft-ietf-spring-segment-routing, it =
would make sense</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>to =
make explicit reference to RFC 8287 because that is the key =
document</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'>that =
means no further OAM discussion is needed in this =
document.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Probably just copy in the following =
paragraph</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>SR OAM use cases for the MPLS data plane are defined =
in</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; =
</span>[I-D.ietf-spring-oam-usecase].<span =
style=3D'mso-spacerun:yes'>&nbsp; </span>SR OAM procedures for the MPLS =
data</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman \;color\:\#1F497D"'><span =
style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>plane are defined in =
[RFC8287].</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed. Copied<br =
style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>---</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>8.</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New Roman =
\;color\:\#1F497D"'>Possibly Himanshu would prefer to be named as =
&quot;Himanshu Shah&quot;.</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'>#Ahmed: Thanks for catching that =
:)<br style=3D'mso-special-character:line-break'><![if =
!supportLineBreakNewLine]><br =
style=3D'mso-special-character:line-break'><![endif]><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bidi-font-family:"Times New =
Roman \;color\:\#1F497D"'>&nbsp;</span><o:p></o:p></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-ansi-lang=
uage:EN-US'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-ansi-lang=
uage:EN-US'> spring [<a =
href=3D"mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a=
>] <b>On Behalf Of </b><a =
href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a><b=
r><b>Sent:</b> 24 May 2018 18:14<br><b>To:</b> SPRING WG =
List<br><b>Cc:</b> <a =
href=3D"mailto:draft-ietf-spring-segment-routing-mpls@ietf.org">draft-iet=
f-spring-segment-routing-mpls@ietf.org</a><br><b>Subject:</b> [spring] =
WG Last Call for =
draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p></div></di=
v><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>Hello Working =
Group,</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>&nbsp;&nbsp;&nbsp; =
</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>This email starts a Working Group Last =
Call on draft-ietf-spring-segment-routing-mpls-13 [1] which is =
considered mature and ready for a final working group =
review.</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>&nbsp;&nbsp;&nbsp; =
</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>Please read this document if you =
haven't read the most recent version yet, and send your comments to the =
list, no later than *June 08*.</span><o:p></o:p></pre><pre><span =
lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>&nbsp;</span><o:p></o:p></pre><pre><spa=
n lang=3DEN-US style=3D'mso-ansi-language:EN-US'>As a reminder, this =
document had already passed a WGLC more than a year ago on version -06 =
[2], had been sent to the AD but then returned to the =
WG.</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>Since then, the document has =
significantly changed, so please read it again. In particular, it now =
includes the resolution in case of incoming label collision. Hence it =
killed =
draft-ietf-spring-conflict-resolution.</span><o:p></o:p></pre><pre><span =
lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>&nbsp;</span><o:p></o:p></pre><pre><spa=
n lang=3DEN-US style=3D'mso-ansi-language:EN-US'>Both co-chairs =
co-author this document, hence:</span><o:p></o:p></pre><pre><span =
lang=3DEN-US style=3D'mso-ansi-language:EN-US'>- Shraddha has agreed to =
be the document shepherd.. Thank you =
Shraddha.</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>- Martin, our AD, has agreed to =
evaluate the WG consensus.</span><o:p></o:p></pre><pre><span =
lang=3DEN-US style=3D'mso-ansi-language:EN-US'>&nbsp;&nbsp;&nbsp; =
</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>Thank =
you,</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>Bruno, =
Rob</span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>&nbsp;</span><o:p></o:p></pre><pre><spa=
n lang=3DEN-US style=3D'mso-ansi-language:EN-US'>[1] <a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpl=
s-13">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-=
13</a></span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>[2] <a =
href=3D"https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4Bi=
UnyMu7Y">https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4B=
iUnyMu7Y</a></span><o:p></o:p></pre><pre><span lang=3DEN-US =
style=3D'font-family:"Arial","sans-serif";mso-ansi-language:EN-US'>&nbsp;=
</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>__________________________________________=
_________________________________________________________________________=
______</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>&nbsp;</span><o:p></o:p></pre><pre><span =
lang=3DFR style=3D'mso-ansi-language:FR'>Ce message et ses pieces =
jointes peuvent contenir des informations confidentielles ou =
privilegiees et ne doivent donc</span><o:p></o:p></pre><pre><span =
lang=3DFR style=3D'mso-ansi-language:FR'>pas etre diffuses, exploites ou =
copies sans autorisation. Si vous avez recu ce message par erreur, =
veuillez le signaler</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>a l'expediteur et le detruire ainsi que =
les pieces jointes. Les messages electroniques etant susceptibles =
d'alteration,</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>Orange decline toute responsabilite si ce =
message a ete altere, deforme ou falsifie. =
Merci.</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>&nbsp;</span><o:p></o:p></pre><pre><span =
lang=3DFR style=3D'mso-ansi-language:FR'>This message and its =
attachments may contain confidential or privileged information that may =
be protected by law;</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>they should not be distributed, used or =
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lang=3DFR style=3D'mso-ansi-language:FR'>If you have received this email =
in error, please notify the sender and delete this message and its =
attachments.</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>As emails may be altered, Orange is not =
liable for messages that have been modified, changed or =
falsified.</span><o:p></o:p></pre><pre><span lang=3DFR =
style=3D'mso-ansi-language:FR'>Thank =
you.</span><o:p></o:p></pre></div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Times New =
Roman","serif";mso-fareast-font-family:"Times New =
Roman";mso-fareast-language:EN-GB'><o:p>&nbsp;</o:p></span></p></div></di=
v></body></html>
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From: "Zafar Ali (zali)" <zali@cisco.com>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
CC: "Zafar Ali (zali)" <zali@cisco.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
Thread-Index: AQHT+cKki+AMif91OkKrakOGxBk/KqRcs6yA
Date: Tue, 12 Jun 2018 13:45:17 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/FbweygscIpXz3tPHoqQGchl1eXA>
Subject: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth)
ISIS/OSPF is signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: Martin Stiemerling <mls.ietf@gmail.com>, tsv-art@ietf.org, SPRING WG <spring@ietf.org>,  =?UTF-8?Q?Mirja_K=C3=BChlewind?= <ietf@kuehlewind.net>
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Hi Mirja,

Friendly Reminder...Could you please also advice if there is anything
further to DISCUSS on this document which was also related to TCP updates
below?

Cheers,

Gaurav

On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana <aretana.ietf@gmail.com>
wrote:

> Thanks Martin!
>
> On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com)
> wrote:
>
> Hi Alvaro, all,
>
> Thanks for addressing my concerns.
>
> This version is good to go from my side.
>
> Kind regards,
>
> ;Martin
>
> Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> > Martin:
> > br/>> Hi!!  How are you?
> > br/>> Gaurav just posted a revision.  Please takke a look and let us
> know if br/>> the changes address your concerrns or not.
> > br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-
> segment-routing-msdc-09
> > br/>> Thanks!!!
> > br/>> Alvaro. <
> > br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((
> gdawra.ietf@gmail.com br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:
> > br/>>> Hi Martin, <
> >>
> >> Thanks for review. I will post the new version. Hopefully, it will
> br/>>> address all your comments and we can close thhis review.
> >>
> >> Any updates on below response?
> >>
> >> Cheers,
> >>
> >> Gaurav
> >>
> >> Sent from my iPhone
> >>
> >> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com
> br/>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
> >>
> >>> Hi Martin,
> >>>
> >>> Thanks for the review. Any further comments here ? I will post the
> br/>>>> new version soon. <
> >>>
> >>> Cheers,
> >>>
> >>> Gaurav
> >>>
> >>> Sent from my iPhone
> >>>
> >>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com
> br/>>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
> >>>
> >>>> Hi Martin,
> >>>>
> >>>> Apologies from my end we had few internal authors conversations on
> br/>>>>> the points you have raised. <
> >>>>
> >>>> Please find below my response. I will be happy to discuss further,
> br/>>>>> if needed. <
> >>>>
> >>>> <Gaurav> inline...
> >>>>
> >>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com
> br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:
> >>>>>
> >>>>> Hi Gaurav,
> >>>>>
> >>>>> This got lost on my end, sorry for this. The filter just moved
> br/>>>>>> these messages out of my sight... :-/
> >>>>>
> >>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
> >>>>>> Hey Martin,
> >>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
> >>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>>
> <mls.ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:
> mls.ietf@gmail.com>> wrote:
> >>>>>>>
> >>>>>>> Hi all,
> >>>>>>>
> >>>>>>> I've reviewed this document as part of the transport area review
> br/>>>>>>>> team's ongoing effort to review key IETF documents. These
> br/>>>&gtt;>>>> comments were written primarily for the transport area
> directors, br/>>>>>>>> but are copied to the doocument's authors for thei=
r
> information br/>>>>>>>&> and to allow them to address any issues raised.
> When done at the
> >>>>>>> time of IETF Last Call, the authors should consider this review
> br/>>>>>>>> together with any other last-call comments they receive. Plea=
se
> br/>>>&>>>>> always CC tsv-art@=E2=80=A6 if you reply to or forward this =
review.
> >>>>>>>
> >>>>>>> Summary:
> >>>>>>> This draft has serious issues in Section 7.1, 7.2 and in one part
> br/>>>>>>>> of Secction3, described in the review, and needs to be
> rethought. br/>>&>>>>>> The other sections are good AFAIK.
> >>>>>>>
> >>>>>>>
> >>>>>>> Technicals:
> >>>>>>> The overall draft looks ok, but the three points below look
> br/>>>>>>>> strange and need a fix before publication IMHO:
> >>>>>>>
> >>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well
> br/>>>>>>>> proven funcationality and not even safe to use functionality.
> br/>>>&>>>>> Both are some sort discussing that different paths in the
> network br/>>>>>>>> could be used by the eend host traffic. This sounds
> pretty much br/>>>>>>&gtt;> like the Path Aware Networking Proposed
> Research Group br/>&gtt;>>>>>> (https://irtf.org/panrg) and hints to the
> fact that there is no br/>>>>>>>> commonly understannd and accepted
> engineering solution in this space.
> >>>>>>>
> >>>>>>> Section 7.1:
> >>>>>>> [KANDULA04] is a really old reference that hasn't been followed
> br/>>>>>>>> up iin recent times and even worse there is no evidence that
> this br/>&gtt;>>>>>> is going to work good enough or stable enough under
> real Internet br/>>>>>>>> traffic. Additioonally, it is more than unclear
> how any modern TCP br/>>>>&ggt;>>> implementation will react to this
> >>>>>> [Gaurav] Will get back on this.
> >>>>>
> >>>>> I will reply to the other email dicussing this.
> >>>> <Gaurav> I have replied to other thread.
> >>>>>
> >>>>>>>
> >>>>>>> Section 7.2:
> >>>>>>> This section describes an idea without detailing too much about
> br/>>>>>>>> any furtther aspects. Further it changes the commonly accepte=
d
> br/>>>;>>>>> notion of what an end host can do with the network. At best
> this br/>>>>>>>> would require a good ddefinition of what an end host in
> your br/>>>>>>>&ggt; setting is, e.g., a highly modified piece of (at
> least) software
> >>>>>>> that usually not found in OS availble on the market (yet?)
> >>>>>>> Further communicating instantaneous path characteristics to a
> br/>>>>>>>> central point is potentially a bad idea, as the data is alrea=
dy
> br/>>>;>>>>> outdated when reported by any node.
> >>>>>> [Gaurav] I believe Authors are trying to highlight that Host which
> br/>>>>>>> is defineed in br/>>>>>>> (https://tools.ietf.org/html/
> draftt-ietf-spring-segment-routing-15) br/>>>>>>> can innfluence the
> traffic based on the Calculations locally or br/>>&gtt;>>>> jointly with
> the controller. Implementations can decide how much br/>>>>>>> Centralize=
d
> -vs- localized coontrol is allowed at Host based on br/>>>>>>> perfoorman=
ce
> data collection.
> >>>>>
> >>>>> Performance data collection (monitoring?) isn't crucial when it
> br/>>>>>> comes to timely (actuaally real-time) reaction. However, this
> br/>>>>>> secttion isn't just about performance data collection as it is
> about br/>>>>>>> "Performance-aware routing" this seems to try to interac=
t
> in br/>>>>>> real-time with the network behhavior of TCP. This isn't even
> close br/>>>>>> to acceeptable.
> >>>>>
> >>>>> I would be ok to say that it is useful to collect performance data
> br/>>>>>> for offline analysis and improvement of the data network.
> However, br/>>>>>&ggt; this is at completely different magnitues of time
> scales.
> >>>>>
> >>>>> I would recommend to remove the TCP part from this section entirely=
.
> >>>> <Gaurav>Ack, will update in next rev:
> >>>>
> >>>> Section will read like this:
> >>>>
> >>>> ;
> >>>> /Knowing the path associated with flows/packets, the end host may/
> >>>> /deduce certain characteristics of the path on its own, and/
> >>>> /additionally use the information supplied with path information/
> >>>> /pushed from the controller or received via pull request. The host/
> >>>> /may further share its path observations with the centralized agent,=
/
> >>>> /so that the latter may keep up-to-date network health map to assist=
/
> >>>> /other hosts with this information./
> >>>> //
> >>>> /For example, an application A.1 at HostA may pin a flow destined/
> >>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The=
/
> >>>> /application A.1 may collect information on packet loss, deduced
> from/
> >>>> /Other offline mechanisms. [There are some pingMesh mechanisms which
> /
> >>>> /Can be used here]/
> >>>> /Through these mechanisms information to a centralized agent, e.g./
> >>>> /after a flow completes, or periodically for longer lived flows./
> >>>> /Next, using both local and/or global performance data, application/
> >>>> /A.1 as well as other applications sharing the same resources in the=
/
> >>>> /DC fabric may pick up the best path for the new flow, or update an/
> >>>> /existing path (e.g.: when informed of congestion on an existing/
> >>>> /path)./
> >>>> ;
> >>>>
> >>>>>
> >>>>>
> >>>>>>>
> >>>>>>> Section 3, 3rd bullet point:
> >>>>>>> It is the foundation of TCP that the network is regarded as a
> br/>>>>>>>> black box and that you infer from the transmission of packets
> br/>>>>;>>>> what the current state of the network path is. Inferring
> network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad
> idea, as br/>>>>>>>>; this would required that all paths exhibit this and
> if not what br//>>>>>>>> is going to happen?
> >>>>>>> It could be an interesting research field to change many points
> br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact th=
at
> br/>>>&>>>>> this not the IETF works but IRTF or elsewhere.
> >>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly
> br/>>>>>>> treating Network as Black Box. Authors are implying per path
> br/>>>>;>>> performance metrics as not cached. Is there some change in te=
xt
> br/>>>>>>> you are suggesting??
> >>>>>
> >>>>>
> >>>>> I would recommend to remove the 3rd bullet point completey. TCP
> br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is
> br/>>>>>> something the network could decide, e.g., rerouting TCP flows
> br/>&ggt;>>>> within the network or changing the forwarding path in the
> network br/>>>>>> for particular flows (if it is not routed).
> >>>>
> >>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd
> br/>>>>> bullet point. Willl update in next rev - coming shortly.
> >>>>
> >>>>>
> >>>>> Kind regards,
> >>>>>
> >>>>>  Martin
> >>>>>
> >>>>
>
>

--0000000000004fb984056e725e68
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Mirja,<div><br></div><div>Friendly Reminder...Could you=
 please also advice if there is anything further to DISCUSS on this documen=
t which was also related to TCP updates below?</div><div><br></div><div>Che=
ers,</div><div><br></div><div>Gaurav</div><div class=3D"gmail_extra"><br><d=
iv class=3D"gmail_quote">On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:aretana.ietf@gmail.com" target=3D"_blan=
k">aretana.ietf@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"> <p style=3D"margin:0.0px 0.0px 0.0px 0.0px"><font face=3D"Helvetica=
" size=3D"4" style=3D"font:13.0px Helvetica">Thanks Martin!</font></p><span=
 class=3D"">
 <br><p class=3D"m_7352406945680739771airmail_on">On June 6, 2018 at 3:14:4=
5 PM, Martin Stiemerling (<a href=3D"mailto:mls.ietf@gmail.com" target=3D"_=
blank">mls.ietf@gmail.com</a>) wrote:</p> </span><blockquote type=3D"cite" =
class=3D"m_7352406945680739771clean_bq"><span><div><div></div><div><span cl=
ass=3D"">Hi Alvaro, all,

<br>

<br>Thanks for addressing my concerns.

<br>

<br>This version is good to go from my side.

<br>

<br>Kind regards,

<br>

<br>   ;Martin

<br>

<br>Am 30.05.18 um 21:55 schrieb Alvaro Retana:

<br>&gt; Martin:

<br></span>&gt; =20
br/&gt;&gt; Hi!!=C2=A0 How are you?

<br>&gt; =20
br/&gt;&gt; Gaurav just posted a revision.=C2=A0 Please takke a look and le=
t us know if =20
br/&gt;&gt; the changes address your concerrns or not.

<br>&gt; =20
br/&gt;&gt; <a href=3D"https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spri=
ng-segment-routing-msdc-09" target=3D"_blank">https://www.ietf.org/rfcdiff?=
?<wbr>url2=3Ddraft-ietf-spring-<wbr>segment-routing-msdc-09</a>

<br>&gt; =20
br/&gt;&gt; Thanks!!!

<br>&gt; =20
br/&gt;&gt; Alvaro.
&lt;
<br>&gt; =20
br/&gt;&gt; On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((<a href=3D"mailt=
o:gdawra.ietf@gmail.com" target=3D"_blank">gdawra.ietf@gmail.com</a> =20
br/&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_blank">gd=
awra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail.com</a>=
<wbr>&gt;) wrote:

<br>&gt; =20
br/&gt;&gt;&gt; Hi Martin,
&lt;
<br>&gt;&gt;

<br>&gt;&gt; Thanks for review. I will post the new version. Hopefully, it =
will =20
br/&gt;&gt;&gt; address all your comments and we can close thhis review.

<br><span class=3D"">&gt;&gt;

<br>&gt;&gt; Any updates on below response?

<br>&gt;&gt;

<br>&gt;&gt; Cheers,

<br>&gt;&gt;

<br>&gt;&gt; Gaurav

<br>&gt;&gt;

<br>&gt;&gt; Sent from my iPhone

<br>&gt;&gt;

<br></span><span class=3D"">&gt;&gt; On May 23, 2018, at 4:17 AM, Gaurav Da=
wra &lt;<a href=3D"mailto:gdawra.ietf@gmail.com" target=3D"_blank">gdawra.i=
etf@gmail.com</a> =20
br/&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_blank=
">gdawra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail.com=
</a><wbr>&gt;&gt; wrote:

<br>&gt;&gt;

<br>&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;

<br></span>&gt;&gt;&gt; Thanks for the review. Any further comments here ? =
I will post the =20
br/&gt;&gt;&gt;&gt; new version soon.
&lt;
<br><span class=3D"">&gt;&gt;&gt;

<br>&gt;&gt;&gt; Cheers,

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Gaurav

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Sent from my iPhone

<br>&gt;&gt;&gt;

<br></span><span class=3D"">&gt;&gt;&gt; On May 16, 2018, at 7:44 PM, Gaura=
v Dawra &lt;<a href=3D"mailto:gdawra.ietf@gmail.com" target=3D"_blank">gdaw=
ra.ietf@gmail.com</a> =20
br/&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_b=
lank">gdawra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail=
.com</a><wbr>&gt;&gt; wrote:

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt; Apologies from my end we had few internal autho=
rs conversations on =20
br/&gt;&gt;&gt;&gt;&gt; the points you have raised.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Please find below my response. I will be happy to disc=
uss further, =20
br/&gt;&gt;&gt;&gt;&gt; if needed.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; inline...

<br><span class=3D"">&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; On Apr 9, 2018, at 7:58 AM, Martin Stiemerling &lt=
;<a href=3D"mailto:mls.ietf@gmail.com" target=3D"_blank">mls.ietf@gmail.com=
</a> =20
br/&gt;&gt;&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:mls.iietf@gmail.co=
m" target=3D"_blank">mls.iietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Hi Gaurav,

<br>&gt;&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt;&gt; This got lost on my end, sorry for this. Th=
e filter just moved =20
br/&gt;&gt;&gt;&gt;&gt;&gt; these messages out of my  sight... :-/

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Am 15.02.18 um 05:47 schrieb Gaurav Dawra:

<br>&gt;&gt;&gt;&gt;&gt;&gt; Hey Martin,

<br>&gt;&gt;&gt;&gt;&gt;&gt; Sorry for late reply. Please see some comments=
 inline[Gaurav]

<br></span><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt;&gt; On Jan 9, 2018, at=
 2:25 PM, Martin Stiemerling =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; &lt;mls.ietf@@<a href=3D"http://gmail.c=
om" target=3D"_blank">gmail.com</a> &lt;mailto:<a href=3D"mailto:mls.ietf@g=
mail.com" target=3D"_blank">mls.ietf@gmail.com</a>&gt; =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; &lt;mailto:<a href=3D"mailto:mls.ietf@=
gmail.com" target=3D"_blank">mls.ietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Hi all,

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; I&#39;ve reviewed this document as =
part of the transport area review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; team&#39;s  ongoing effort to review ke=
y IETF documents. These =20
br/&gt;&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; comments were written primarily fo=
r the transport area directors, =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; but are copied to the doocument&#39;s a=
uthors for their information =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;&gt; and to allow them to address any i=
ssues raised. When done at the =20
<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; time of IETF Last Call, the authors should=
 consider this review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; together  with any other last-call comm=
ents they receive. Please =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; always CC tsv-art@=E2=80=A6 if you=
 reply to or forward this review.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Summary:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This draft has serious issues in Section 7=
.1, 7.2 and in one part =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; of Secction3, described in the review, =
and needs to be rethought. =20
br/&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt;&gt; The other sections are good AFAIK.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Technicals:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; The overall draft looks ok, but the three =
points below look =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; strange and  need a fix before publicat=
ion IMHO:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Both Sections, 7.1. and 7.2., are describi=
ng ideas, but not well =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; proven  funcationality and not even saf=
e to use functionality. =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; Both are some sort discussing that=
 different paths in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; could be used by the eend host traffic.=
 This sounds pretty much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&amp;gtt;&gt; like the Path Aware Networking Pro=
posed Research Group =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://irtf.org/panrg=
" target=3D"_blank">https://irtf.org/panrg</a>) and hints to the fact that =
there is no =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; commonly understannd and accepted engin=
eering solution in this space.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.1:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; [KANDULA04] is a really old reference that=
 hasn&#39;t been followed =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; up iin recent times and even worse ther=
e is no evidence that this =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; is going to work good enough or st=
able enough under real Internet =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; traffic. Additioonally, it is more than=
 unclear how any modern TCP =20
br/&gt;&gt;&gt;&gt;&amp;ggt;&gt;&gt;&gt; implementation will react to this

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Will get back on thi=
s.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I will reply to the other email dicussing this.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; I have replied to other thread.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.2:

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This section describes an idea with=
out detailing too much about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; any furtther aspects. Further it change=
s the commonly accepted =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; notion of what an end host can do with=
 the network. At best this =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; would require a good ddefinition of wha=
t an end host in your =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;ggt; setting is, e.g., a highly modifie=
d piece of (at least) software =20
<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt;&gt; that usually not found in=
 OS availble on the market (yet?)

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Further communicating instantaneous=
 path characteristics to a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; central  point is potentially a bad ide=
a, as the data is already =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; outdated when reported by any node.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] I believe Authors are trying to highl=
ight that Host which =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; is defineed in =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://tools.ietf.org/html/dra=
ftt-ietf-spring-segment-routing-15" target=3D"_blank">https://tools.ietf.or=
g/html/<wbr>draftt-ietf-spring-segment-<wbr>routing-15</a>) =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; can innfluence the traffic based on the Cal=
culations locally or =20
br/&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; jointly with the controller. Implement=
ations can decide how much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; Centralized -vs- localized coontrol is allo=
wed at Host based on =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; perfoormance data collection.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Performance data collection (monitoring?) isn&#39;=
t crucial when it =20
br/&gt;&gt;&gt;&gt;&gt;&gt; comes to timely (actuaally real-time) reaction.=
 However, this =20
br/&gt;&gt;&gt;&gt;&gt;&gt; secttion isn&#39;t just about performance data =
collection as it is about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; &quot;Performance-aware routing&quot; this =
seems to try to interact in =20
br/&gt;&gt;&gt;&gt;&gt;&gt; real-time with the network behhavior of TCP. Th=
is isn&#39;t even close =20
br/&gt;&gt;&gt;&gt;&gt;&gt; to acceeptable.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would be ok to say that it is useful to collect =
performance data =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for offline analysis  and improvement of the da=
ta network. However, =20
br/&gt;&gt;&gt;&gt;&gt;&amp;ggt; this is at completely different magnitues =
of time scales.

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the TCP part from this=
 section entirely.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt;Ack, will update in next rev:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Section will read like this:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt; /Knowing the path associated with flows/packets, the e=
nd host may/

<br>&gt;&gt;&gt;&gt; /deduce certain characteristics of the path on its own=
, and/

<br>&gt;&gt;&gt;&gt; /additionally use the information supplied with path i=
nformation/

<br>&gt;&gt;&gt;&gt; /pushed from the controller or received via pull reque=
st. The host/

<br>&gt;&gt;&gt;&gt; /may further share its path observations with the cent=
ralized agent,/

<br>&gt;&gt;&gt;&gt; /so that the latter may keep up-to-date network health=
 map to assist/

<br>&gt;&gt;&gt;&gt; /other hosts with this information./

<br>&gt;&gt;&gt;&gt; //

<br>&gt;&gt;&gt;&gt; /For example, an application A.1 at HostA may pin a fl=
ow destined/

<br>&gt;&gt;&gt;&gt; /to HostZ via Spine node Node5 using label stack {1600=
5, 16011}. The/

<br>&gt;&gt;&gt;&gt; /application A.1 may collect information on packet los=
s, deduced from/

<br>&gt;&gt;&gt;&gt; /Other offline mechanisms. [There are some pingMesh me=
chanisms which /

<br>&gt;&gt;&gt;&gt; /Can be used here]/

<br>&gt;&gt;&gt;&gt; /Through these mechanisms information to a centralized=
 agent, e.g./

<br>&gt;&gt;&gt;&gt; /after a flow completes, or periodically for longer li=
ved flows./

<br>&gt;&gt;&gt;&gt; /Next, using both local and/or global performance data=
, application/

<br>&gt;&gt;&gt;&gt; /A.1 as well as other applications sharing the same re=
sources in the/

<br>&gt;&gt;&gt;&gt; /DC fabric may pick up the best path for the new flow,=
 or update an/

<br>&gt;&gt;&gt;&gt; /existing path (e.g.: when informed of congestion on a=
n existing/

<br>&gt;&gt;&gt;&gt; /path)./

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 3, 3rd bullet point:

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It is the foundation of TCP that th=
e network is regarded as a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; black box  and that you infer from the =
transmission of packets =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt;&gt; what the current state of the network =
path is. Inferring network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; path metrics (you mention  SRTT, MSS, C=
WND ) is a bad idea, as =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; this would required that all paths exh=
ibit this and if not what =20
br//&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; is going to happen?

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It could be an interesting research field =
to change many points =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; in TCP&#39;ss behavior, but this once a=
gain points to the fact that =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; this not the IETF works but IRTF o=
r elsewhere.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Martin, Authors are trying to suggest=
 that TCP is rightly =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; treating  Network as Black Box. Authors are=
 implying per path =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt; performance metrics as not cached. Is ther=
e some change in text =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; you are suggesting??

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the 3rd bullet point c=
ompletey. TCP =20
br/&gt;&gt;&gt;&gt;&gt;&gt; isn&#39;t the place to rememmber &quot;good&quo=
t; or &quot;bad&quot; paths. This is =20
br/&gt;&gt;&gt;&gt;&gt;&gt;  something the network could decide, e.g., rero=
uting TCP flows =20
br/&gt;&amp;ggt;&gt;&gt;&gt;&gt; within the network or changing the forward=
ing path in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for particular flows (if it is  not routed).

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; Ack, after discussion, we will remove t=
he Section 3 - 3rd =20
br/&gt;&gt;&gt;&gt;&gt; bullet point.=C2=A0Willl update in next rev - comin=
g shortly.

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Kind regards,

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; =C2=A0Martin

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;

<br></div></div></span></blockquote>
</blockquote></div><br></div></div>

--0000000000004fb984056e725e68--


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "spring-chairs@ietf.org" <spring-chairs@ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: SR Policy draft update and its spin off drafts
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Date: Tue, 12 Jun 2018 14:06:42 +0000
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Subject: [spring] SR Policy draft update and its spin off drafts
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Hello Chairs/WG,

Would like to inform that the draft-ietf-spring-segment-routing-policy-01 v=
ersion has been posted earlier today with the focussed content as previousl=
y discussed on the mailing list.

At this point, the authors of the draft-filsfils-spring-sr-traffic-counters=
 and draft-filsfils-spring-sr-policy-considerations would like to request f=
or their adoption by the WG.

Given that the contents of these two drafts are entirely (almost verbatim) =
picked from the draft-filsfils-spring-segment-routing-policy-05 which was a=
dopted by the WG, the text and topics covered in them are already familiar =
to the WG. While perhaps the expression of interest to work on these topics=
 was conveyed as part of the adoption call on the combined version of that =
document, a more formal adoption request and call for these two drafts seem=
s more appropriate.

Thanks,
Ketan (on behalf of co-authors of the two drafts)

-----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of internet-drafts@ietf.or=
g
Sent: 12 June 2018 10:16
To: i-d-announce@ietf.org
Cc: spring@ietf.org
Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-01.t=
xt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Source Packet Routing in Networking WG of =
the IETF.

        Title           : Segment Routing Policy Architecture
        Authors         : Clarence Filsfils
                          Siva Sivabalan
                          Daniel Voyer
                          Alex Bogdanov
                          Paul Mattes
	Filename        : draft-ietf-spring-segment-routing-policy-01.txt
	Pages           : 33
	Date            : 2018-06-11

Abstract:
   Segment Routing (SR) allows a headend node to steer a packet flow
   along any path.  Intermediate per-flow states are eliminated thanks
   to source routing.  The headend node steers a flow into an SR Policy.
   The header of a packet steered in an SR Policy is augmented with an
   ordered list of segments associated with that SR Policy.  This
   document details the concepts of SR Policy and steering into an SR
   Policy.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-pol=
icy-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-polic=
y-01


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
spring mailing list
spring@ietf.org
https://www.ietf.org/mailman/listinfo/spring


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
CC: "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Przemyslaw Krol <pkrol@google.com>
Date: Tue, 12 Jun 2018 08:33:48 -0700
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Subject: Re: [spring] SR Policy draft update and its spin off drafts
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Hi Ketan, Authors

4 <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01#section-4>.
Segment Types

  However, the SID-List itself
   can be specified using different segment-descriptor *types* and the
   following are currently defined:

   *Type 1*: SR-MPLS Label:
Additionally,
         reserved labels like explicit-null or in general any MPLS label
         may also be used.  e.g. *this type* can be used to specify a
         label representation which maps to an optical transport path on
         a packet transport node.  *This type* does not require the
         headend to perform SID resolution.


I assume 'this type' in SR-MPLS section really means 'reserved labels'
whereas 'type' in section 4 introduction means segment types. Wouldn't it
be more obvious to explicitly mention that 'Reserved labels' don't require
resolution (contrary to Type 1: SR-MPLS unreserved labels)?
Same probably applies to Type 2.

Also, it may not be worth the hassle, but it seems throughout the
document there is no consistency in terms of policy representation:

<color, endpoint>

vs

<endpoint, color>


thanks,
pk




On Tue, Jun 12, 2018 at 7:08 AM Ketan Talaulikar (ketant) <ketant=
40cisco.com@dmarc.ietf.org> wrote:

> Hello Chairs/WG,
>
> Would like to inform that the draft-ietf-spring-segment-routing-policy-01
> version has been posted earlier today with the focussed content as
> previously discussed on the mailing list.
>
> At this point, the authors of the
> draft-filsfils-spring-sr-traffic-counters and
> draft-filsfils-spring-sr-policy-considerations would like to request for
> their adoption by the WG.
>
> Given that the contents of these two drafts are entirely (almost verbatim)
> picked from the draft-filsfils-spring-segment-routing-policy-05 which was
> adopted by the WG, the text and topics covered in them are already familiar
> to the WG. While perhaps the expression of interest to work on these topics
> was conveyed as part of the adoption call on the combined version of that
> document, a more formal adoption request and call for these two drafts
> seems more appropriate.
>
> Thanks,
> Ketan (on behalf of co-authors of the two drafts)
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of
> internet-drafts@ietf.org
> Sent: 12 June 2018 10:16
> To: i-d-announce@ietf.org
> Cc: spring@ietf.org
> Subject: [spring] I-D Action:
> draft-ietf-spring-segment-routing-policy-01.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Source Packet Routing in Networking WG of
> the IETF.
>
>         Title           : Segment Routing Policy Architecture
>         Authors         : Clarence Filsfils
>                           Siva Sivabalan
>                           Daniel Voyer
>                           Alex Bogdanov
>                           Paul Mattes
>         Filename        : draft-ietf-spring-segment-routing-policy-01.txt
>         Pages           : 33
>         Date            : 2018-06-11
>
> Abstract:
>    Segment Routing (SR) allows a headend node to steer a packet flow
>    along any path.  Intermediate per-flow states are eliminated thanks
>    to source routing.  The headend node steers a flow into an SR Policy.
>    The header of a packet steered in an SR Policy is augmented with an
>    ordered list of segments associated with that SR Policy.  This
>    document details the concepts of SR Policy and steering into an SR
>    Policy.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01
>
> https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-policy-01
>
> A diff from the previous version is available at:
>
> https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-policy-01
>
>
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
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-- 
Przemyslaw "PK" Krol |  Strategic Network Engineer ing | pkrol@google.com

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Ketan, Authors<div><br></div><div><pre class=3D"gmail-m=
_2203292675870289851m_-3162508168685181022gmail-newpage" style=3D"font-size=
:13.3333px;margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0=
,0);text-decoration-style:initial;text-decoration-color:initial"><span clas=
s=3D"gmail-m_2203292675870289851m_-3162508168685181022gmail-h2" style=3D"li=
ne-height:0pt;display:inline;white-space:pre-wrap;font-size:1em;font-weight=
:bold"><h2 style=3D"line-height:0pt;display:inline;white-space:pre-wrap;fon=
t-size:1em;font-weight:bold"><font face=3D"arial, helvetica, sans-serif"><a=
 class=3D"gmail-m_2203292675870289851m_-3162508168685181022gmail-selflink" =
name=3D"m_2203292675870289851_m_-3162508168685181022_section-4" href=3D"htt=
ps://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01#sectio=
n-4" style=3D"color:black;text-decoration:none" target=3D"_blank">4</a>.  S=
egment Types</font></h2></span></pre><div><div><font face=3D"arial, helveti=
ca, sans-serif">=C2=A0 However, the SID-List itself</font></div><div><font =
face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0can be specified using d=
ifferent segment-descriptor <b>types</b> and the</font></div><div><font fac=
e=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0following are currently def=
ined:</font></div><div><font face=3D"arial, helvetica, sans-serif"><br></fo=
nt></div><div><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0<b>T=
ype 1</b>: SR-MPLS Label:</font></div></div><div><div><font face=3D"arial, =
helvetica, sans-serif">Additionally,</font></div><div><font face=3D"arial, =
helvetica, sans-serif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0reserved labels li=
ke explicit-null or in general any MPLS label</font></div><div><font face=
=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0may als=
o be used.=C2=A0 e.g. <b>this type</b> can be used to specify a</font></div=
><div><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0label representation which maps to an optical transport path on</=
font></div><div><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0a packet transport node.=C2=A0 <b>This type</b> does no=
t require the</font></div><div><font face=3D"arial, helvetica, sans-serif">=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0headend to perform SID resolution.</font>=
</div></div><div><br></div><div><br></div><div>I assume &#39;this type&#39;=
 in SR-MPLS section really means &#39;reserved labels&#39; whereas &#39;typ=
e&#39; in section 4 introduction means segment types. Wouldn&#39;t it be mo=
re obvious to explicitly mention that &#39;Reserved labels&#39; don&#39;t r=
equire resolution (contrary to Type 1: SR-MPLS unreserved labels)?</div><di=
v>Same probably applies to Type 2.=C2=A0</div><div><br></div><div><pre clas=
s=3D"gmail-m_2203292675870289851gmail-newpage" style=3D"font-size:13.3333px=
;margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0);text-d=
ecoration-style:initial;text-decoration-color:initial"><font face=3D"arial,=
 helvetica, sans-serif">Also, it may not be worth the hassle, but it seems =
throughout the document there is no consistency in terms of policy represen=
tation:</font></pre><pre class=3D"gmail-m_2203292675870289851gmail-newpage"=
 style=3D"margin-top:0px;margin-bottom:0px;break-before:page;text-decoratio=
n-style:initial;text-decoration-color:initial"><font color=3D"#000000" face=
=3D"arial, helvetica, sans-serif"><span style=3D"font-size:13.3333px">&lt;c=
olor, endpoint&gt; </span></font></pre><pre class=3D"gmail-m_22032926758702=
89851gmail-newpage" style=3D"margin-top:0px;margin-bottom:0px;break-before:=
page;text-decoration-style:initial;text-decoration-color:initial"><font col=
or=3D"#000000" face=3D"arial, helvetica, sans-serif"><span style=3D"font-si=
ze:13.3333px">vs</span></font></pre><pre class=3D"gmail-m_22032926758702898=
51gmail-newpage" style=3D"margin-top:0px;margin-bottom:0px;break-before:pag=
e;text-decoration-style:initial;text-decoration-color:initial"><font color=
=3D"#000000" face=3D"arial, helvetica, sans-serif"><span style=3D"font-size=
:13.3333px">&lt;endpoint, color&gt;</span></font></pre></div><div><br></div=
><div>thanks,</div><div>pk</div><div><br></div><div><br></div><div><br></di=
v></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Jun 1=
2, 2018 at 7:08 AM Ketan Talaulikar (ketant) &lt;ketant=3D<a href=3D"mailto=
:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</=
a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello Chairs/WG,<br>
<br>
Would like to inform that the draft-ietf-spring-segment-routing-policy-01 v=
ersion has been posted earlier today with the focussed content as previousl=
y discussed on the mailing list.<br>
<br>
At this point, the authors of the draft-filsfils-spring-sr-traffic-counters=
 and draft-filsfils-spring-sr-policy-considerations would like to request f=
or their adoption by the WG.<br>
<br>
Given that the contents of these two drafts are entirely (almost verbatim) =
picked from the draft-filsfils-spring-segment-routing-policy-05 which was a=
dopted by the WG, the text and topics covered in them are already familiar =
to the WG. While perhaps the expression of interest to work on these topics=
 was conveyed as part of the adoption call on the combined version of that =
document, a more formal adoption request and call for these two drafts seem=
s more appropriate.<br>
<br>
Thanks,<br>
Ketan (on behalf of co-authors of the two drafts)<br>
<br>
-----Original Message-----<br>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blan=
k">spring-bounces@ietf.org</a>&gt; On Behalf Of <a href=3D"mailto:internet-=
drafts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a><br>
Sent: 12 June 2018 10:16<br>
To: <a href=3D"mailto:i-d-announce@ietf.org" target=3D"_blank">i-d-announce=
@ietf.org</a><br>
Cc: <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a=
><br>
Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-01.t=
xt<br>
<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Source Packet Routing in Networking WG of =
the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Segment Routing Policy Architecture<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Clar=
ence Filsfils<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Siva Sivabalan<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Daniel Voyer<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Alex Bogdanov<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Paul Mattes<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-spring-segment-routing-policy-01.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 33<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2018-06-11<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Segment Routing (SR) allows a headend node to steer a packet f=
low<br>
=C2=A0 =C2=A0along any path.=C2=A0 Intermediate per-flow states are elimina=
ted thanks<br>
=C2=A0 =C2=A0to source routing.=C2=A0 The headend node steers a flow into a=
n SR Policy.<br>
=C2=A0 =C2=A0The header of a packet steered in an SR Policy is augmented wi=
th an<br>
=C2=A0 =C2=A0ordered list of segments associated with that SR Policy.=C2=A0=
 This<br>
=C2=A0 =C2=A0document details the concepts of SR Policy and steering into a=
n SR<br>
=C2=A0 =C2=A0Policy.<br>
<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routi=
ng-policy/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.o=
rg/doc/draft-ietf-spring-segment-routing-policy/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-po=
licy-01" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/d=
raft-ietf-spring-segment-routing-policy-01</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-=
routing-policy-01" rel=3D"noreferrer" target=3D"_blank">https://datatracker=
.ietf.org/doc/html/draft-ietf-spring-segment-routing-policy-01</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-ro=
uting-policy-01" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/=
rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-policy-01</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at <a href=3D"http://to=
ols.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"m_2203292675870289851m_-3162508168685181022gmail_signature" data-=
smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div style=3D"padding-top:10px;margin-top:10px"><table cellsp=
acing=3D"0" cellpadding=3D"0" style=3D"color:rgb(0,0,0);font-family:Times;l=
ine-height:normal;font-size:medium"><tbody><tr style=3D"color:rgb(85,85,85)=
;font-family:sans-serif;font-size:small"><td style=3D"border-top-style:soli=
d;border-top-color:rgb(213,15,37);border-top-width:2px">Przemyslaw &quot;PK=
&quot; Krol |</td><td style=3D"border-top-style:solid;border-top-color:rgb(=
51,105,232);border-top-width:2px">=C2=A0Strategic Network Engineer</td><td =
style=3D"border-top-style:solid;border-top-color:rgb(0,153,57);border-top-w=
idth:2px"><span style=3D"line-height:19px;white-space:normal"><span style=
=3D"border-top-width:2px;border-right-width:0px;border-bottom-width:0px;bor=
der-left-width:0px;border-top-style:solid;border-right-style:solid;border-b=
ottom-style:solid;border-left-style:solid;border-top-color:rgb(51,105,232);=
border-right-color:rgb(51,105,232);border-bottom-color:rgb(51,105,232);bord=
er-left-color:rgb(51,105,232);padding-top:2px;margin-top:2px">ing |</span><=
span style=3D"border-top-width:2px;border-right-width:0px;border-bottom-wid=
th:0px;border-left-width:0px;border-top-style:solid;border-right-style:soli=
d;border-bottom-style:solid;border-left-style:solid;border-top-color:rgb(0,=
153,57);border-right-color:rgb(0,153,57);border-bottom-color:rgb(0,153,57);=
border-left-color:rgb(0,153,57);padding-top:2px;margin-top:2px">=C2=A0<a hr=
ef=3D"mailto:pkrol@google.com" target=3D"_blank"><font color=3D"#1155cc">pk=
rol@google.com</font></a>=C2=A0</span></span></td><td style=3D"border-top-s=
tyle:solid;border-top-color:rgb(238,178,17);border-top-width:2px"><br></td>=
</tr></tbody></table></div></div></div></div></div></div></div></div></div>=
</div></div></div></div></div>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Przemyslaw Krol <pkrol=40google.com@dmarc.ietf.org>
CC: "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] SR Policy draft update and its spin off drafts
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Date: Tue, 12 Jun 2018 15:56:20 +0000
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From: Przemyslaw Krol <pkrol@google.com>
Date: Tue, 12 Jun 2018 09:01:56 -0700
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To: ketant=40cisco.com@dmarc.ietf.org
Cc: pkrol=40google.com@dmarc.ietf.org, spring@ietf.org, spring-chairs@ietf.org
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Subject: Re: [spring] SR Policy draft update and its spin off drafts
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Hi Ketan,

> When the SR/MPLS label is specified directly then no resolution is
required.

Even if it's the top-most SID in the Segment List?
By saying resolution i mean Label -> next-hop interface as per section 5.1:
  o  The headend is unable to resolve the first SID into one or more
      outgoing interface(s) and next-hop(s).

thanks,



On Tue, Jun 12, 2018 at 8:56 AM Ketan Talaulikar (ketant) <ketant=3D
40cisco.com@dmarc.ietf.org> wrote:

> Hi PK,
>
>
>
> The term =E2=80=9Cthis type=E2=80=9D in that block actually means =E2=80=
=9CType 1=E2=80=9D and not just
> reserved labels. When the SR/MPLS label is specified directly then no
> resolution is required. When the Segment is described with parameters (e.=
g.
> type 3 where the prefix address needs to be resolved to its Prefix SID
> label).
>
>
>
> The tuple should be <color,endpoint> as specified in Sec 2.1 and thanks
> for catching this miss. Will fix it in the next rev.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Przemyslaw Krol <pkrol=3D40google.com@dmarc.ietf.org>
> *Sent:* 12 June 2018 21:04
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* spring-chairs@ietf.org; spring@ietf.org
> *Subject:* Re: [spring] SR Policy draft update and its spin off drafts
>
>
>
> Hi Ketan, Authors
>
>
> 4
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01#=
section-4>.
> Segment Types
>
>   However, the SID-List itself
>
>    can be specified using different segment-descriptor *types* and the
>
>    following are currently defined:
>
>
>
>    *Type 1*: SR-MPLS Label:
>
> Additionally,
>
>          reserved labels like explicit-null or in general any MPLS label
>
>          may also be used.  e.g. *this type* can be used to specify a
>
>          label representation which maps to an optical transport path on
>
>          a packet transport node.  *This type* does not require the
>
>          headend to perform SID resolution.
>
>
>
>
>
> I assume 'this type' in SR-MPLS section really means 'reserved labels'
> whereas 'type' in section 4 introduction means segment types. Wouldn't it
> be more obvious to explicitly mention that 'Reserved labels' don't requir=
e
> resolution (contrary to Type 1: SR-MPLS unreserved labels)?
>
> Same probably applies to Type 2.
>
>
>
> Also, it may not be worth the hassle, but it seems throughout the documen=
t there is no consistency in terms of policy representation:
>
> <color, endpoint>
>
> vs
>
> <endpoint, color>
>
>
>
> thanks,
>
> pk
>
>
>
>
>
>
>
>
>
> On Tue, Jun 12, 2018 at 7:08 AM Ketan Talaulikar (ketant) <ketant=3D
> 40cisco.com@dmarc.ietf.org> wrote:
>
> Hello Chairs/WG,
>
> Would like to inform that the draft-ietf-spring-segment-routing-policy-01
> version has been posted earlier today with the focussed content as
> previously discussed on the mailing list.
>
> At this point, the authors of the
> draft-filsfils-spring-sr-traffic-counters and
> draft-filsfils-spring-sr-policy-considerations would like to request for
> their adoption by the WG.
>
> Given that the contents of these two drafts are entirely (almost verbatim=
)
> picked from the draft-filsfils-spring-segment-routing-policy-05 which was
> adopted by the WG, the text and topics covered in them are already famili=
ar
> to the WG. While perhaps the expression of interest to work on these topi=
cs
> was conveyed as part of the adoption call on the combined version of that
> document, a more formal adoption request and call for these two drafts
> seems more appropriate.
>
> Thanks,
> Ketan (on behalf of co-authors of the two drafts)
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of
> internet-drafts@ietf.org
> Sent: 12 June 2018 10:16
> To: i-d-announce@ietf.org
> Cc: spring@ietf.org
> Subject: [spring] I-D Action:
> draft-ietf-spring-segment-routing-policy-01.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Source Packet Routing in Networking WG o=
f
> the IETF.
>
>         Title           : Segment Routing Policy Architecture
>         Authors         : Clarence Filsfils
>                           Siva Sivabalan
>                           Daniel Voyer
>                           Alex Bogdanov
>                           Paul Mattes
>         Filename        : draft-ietf-spring-segment-routing-policy-01.txt
>         Pages           : 33
>         Date            : 2018-06-11
>
> Abstract:
>    Segment Routing (SR) allows a headend node to steer a packet flow
>    along any path.  Intermediate per-flow states are eliminated thanks
>    to source routing.  The headend node steers a flow into an SR Policy.
>    The header of a packet steered in an SR Policy is augmented with an
>    ordered list of segments associated with that SR Policy.  This
>    document details the concepts of SR Policy and steering into an SR
>    Policy.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy=
/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01
>
> https://datatracker..ietf.org/doc/html/draft-ietf-spring-segment-routing-=
policy-01
> <https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-=
policy-01>
>
> A diff from the previous version is available at:
>
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-pol=
icy-01
>
>
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>
>
>
> --
>
> Przemyslaw "PK" Krol |
>
>  Strategic Network Engineer
>
> ing | pkrol@google.com
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>


--=20
Przemyslaw "PK" Krol |  Strategic Network Engineer ing | pkrol@google.com

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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Hi Ketan,<div><br></div><div>&gt;=C2=A0When the SR/MPLS la=
bel is specified directly then no resolution is required.</div><div>=C2=A0<=
/div><div>Even if it&#39;s the top-most SID in the Segment List?</div><div>=
By saying resolution i mean Label -&gt; next-hop interface as per section 5=
.1:</div><div><div>=C2=A0 o=C2=A0 The headend is unable to resolve the firs=
t SID into one or more</div><div>=C2=A0 =C2=A0 =C2=A0 outgoing interface(s)=
 and next-hop(s).</div></div><div><br></div><div>thanks,</div><div><br></di=
v><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On T=
ue, Jun 12, 2018 at 8:56 AM Ketan Talaulikar (ketant) &lt;ketant=3D<a href=
=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-258976301946406925WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi PK,<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The term =E2=80=9Cthis=
 type=E2=80=9D in that block actually means =E2=80=9CType 1=E2=80=9D and no=
t just reserved labels. When the SR/MPLS label is specified directly then n=
o resolution
 is required. When the Segment is described with parameters (e.g. type 3 wh=
ere the prefix address needs to be resolved to its Prefix SID label).<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The tuple should be &l=
t;color,endpoint&gt; as specified in Sec 2.1 and thanks for catching this m=
iss. Will fix it in the next rev.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks,<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Ketan<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Przemyslaw Krol &lt;pkrol=3D<a=
 href=3D"mailto:40google.com@dmarc.ietf.org" target=3D"_blank">40google.com=
@dmarc.ietf.org</a>&gt;
<br>
<b>Sent:</b> 12 June 2018 21:04<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring-chairs@ietf.org" target=3D"_blank">spri=
ng-chairs@ietf.org</a>; <a href=3D"mailto:spring@ietf.org" target=3D"_blank=
">spring@ietf.org</a><br>
<b>Subject:</b> Re: [spring] SR Policy draft update and its spin off drafts=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi Ketan, Authors<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<h2 style=3D"white-space:pre-wrap"><a name=3D"m_-258976301946406925_m_22032=
92675870289851_m_-316250816868518"></a><a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-spring-segment-routing-policy-01#section-4" target=3D"_blank"=
><span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-s=
erif;color:black;text-decoration:none">4</span></span></a><span></span><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif;color:=
black">.=C2=A0
 Segment Types</span><span style=3D"font-size:10.0pt;font-family:&quot;Cour=
ier New&quot;;color:black"><u></u><u></u></span></h2>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 However, the SID-List itself</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0can be specified using different segment-descriptor
<b>types</b> and the</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0following are currently defined:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0<b>Type 1</b>: SR-MPLS Label:</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Additionally,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0reserved labels like explicit-null o=
r in general any MPLS label</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0may also be used.=C2=A0 e.g.
<b>this type</b> can be used to specify a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0label representation which maps to a=
n optical transport path on</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a packet transport node.=C2=A0
<b>This type</b> does not require the</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0headend to perform SID resolution.</=
span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I assume &#39;this type&#39; in SR-MPLS section real=
ly means &#39;reserved labels&#39; whereas &#39;type&#39; in section 4 intr=
oduction means segment types. Wouldn&#39;t it be more obvious to explicitly=
 mention that &#39;Reserved labels&#39; don&#39;t require resolution (contr=
ary
 to Type 1: SR-MPLS unreserved labels)?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Same probably applies to Type 2.=C2=A0<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">Also, it may not be worth the hassle, but it seems throughout t=
he document there is no consistency in terms of policy representation:</spa=
n><span style=3D"color:black"><u></u><u></u></span></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">&lt;color, endpoint&gt; </span><u></u><u></u></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">vs</span><u></u><u></u></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">&lt;endpoint, color&gt;</span><u></u><u></u></pre>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">thanks,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">pk<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Tue, Jun 12, 2018 at 7:08 AM Ketan Talaulikar (ke=
tant) &lt;ketant=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"=
_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class=3D"MsoNormal">Hello Chairs/WG,<br>
<br>
Would like to inform that the draft-ietf-spring-segment-routing-policy-01 v=
ersion has been posted earlier today with the focussed content as previousl=
y discussed on the mailing list.<br>
<br>
At this point, the authors of the draft-filsfils-spring-sr-traffic-counters=
 and draft-filsfils-spring-sr-policy-considerations would like to request f=
or their adoption by the WG.<br>
<br>
Given that the contents of these two drafts are entirely (almost verbatim) =
picked from the draft-filsfils-spring-segment-routing-policy-05 which was a=
dopted by the WG, the text and topics covered in them are already familiar =
to the WG. While perhaps the expression
 of interest to work on these topics was conveyed as part of the adoption c=
all on the combined version of that document, a more formal adoption reques=
t and call for these two drafts seems more appropriate.<br>
<br>
Thanks,<br>
Ketan (on behalf of co-authors of the two drafts)<br>
<br>
-----Original Message-----<br>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blan=
k">spring-bounces@ietf.org</a>&gt; On Behalf Of
<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">internet-draf=
ts@ietf.org</a><br>
Sent: 12 June 2018 10:16<br>
To: <a href=3D"mailto:i-d-announce@ietf.org" target=3D"_blank">i-d-announce=
@ietf.org</a><br>
Cc: <a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a=
><br>
Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-01.t=
xt<br>
<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Source Packet Routing in Networking WG of =
the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Segment Routing Policy Architecture<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Clar=
ence Filsfils<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Siva Sivabalan<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Daniel Voyer<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Alex Bogdanov<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Paul Mattes<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-spring-segment-routing-policy-01.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 33<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2018-06-11<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Segment Routing (SR) allows a headend node to steer a packet f=
low<br>
=C2=A0 =C2=A0along any path.=C2=A0 Intermediate per-flow states are elimina=
ted thanks<br>
=C2=A0 =C2=A0to source routing.=C2=A0 The headend node steers a flow into a=
n SR Policy.<br>
=C2=A0 =C2=A0The header of a packet steered in an SR Policy is augmented wi=
th an<br>
=C2=A0 =C2=A0ordered list of segments associated with that SR Policy.=C2=A0=
 This<br>
=C2=A0 =C2=A0document details the concepts of SR Policy and steering into a=
n SR<br>
=C2=A0 =C2=A0Policy.<br>
<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routi=
ng-policy/" target=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-s=
pring-segment-routing-policy/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-po=
licy-01" target=3D"_blank">https://tools.ietf.org/html/draft-ietf-spring-se=
gment-routing-policy-01</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-=
routing-policy-01" target=3D"_blank">https://datatracker..ietf.org/doc/html=
/draft-ietf-spring-segment-routing-policy-01</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-ro=
uting-policy-01" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraf=
t-ietf-spring-segment-routing-policy-01</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at
<a href=3D"http://tools.ietf.org" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" target=3D"_blank">ftp://ftp=
.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank">=
https://www.ietf.org/mailman/listinfo/spring</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank">=
https://www.ietf.org/mailman/listinfo/spring</a><u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin-top:7.5pt">
<table class=3D"m_-258976301946406925MsoNormalTable" border=3D"0" cellspaci=
ng=3D"0" cellpadding=3D"0">
<tbody>
<tr>
<td style=3D"border:none;border-top:solid #d50f25 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">Przemyslaw &quot;PK&quot; Krol |<u></u><u></u></span></p=
>
</td>
<td style=3D"border:none;border-top:solid #3369e8 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">=C2=A0Strategic Network Engineer<u></u><u></u></span></p=
>
</td>
<td style=3D"border:none;border-top:solid #009939 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555;border:solid #3369e8 1.5pt;padding:2.0pt">ing |</span><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;color:#555555;border:s=
olid #009939 1.5pt;padding:2.0pt">=C2=A0<a href=3D"mailto:pkrol@google.com"=
 target=3D"_blank"><span style=3D"color:#1155cc">pkrol@google.com</span></a=
>=C2=A0</span><span style=3D"font-family:&quot;Arial&quot;,sans-serif;color=
:#555555"><u></u><u></u></span></p>
</td>
<td style=3D"border:none;border-top:solid #eeb211 1.5pt;padding:0cm 0cm 0cm=
 0cm"></td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
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</div>
</div>
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</div>
</div>
</div>
</div>
</div>

_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a><br=
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<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/listinfo/spring</a><br>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"l=
tr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div>=
<div dir=3D"ltr"><div><div dir=3D"ltr"><div><div style=3D"padding-top:10px;=
margin-top:10px"><table cellspacing=3D"0" cellpadding=3D"0" style=3D"color:=
rgb(0,0,0);font-family:Times;line-height:normal;font-size:medium"><tbody><t=
r style=3D"color:rgb(85,85,85);font-family:sans-serif;font-size:small"><td =
style=3D"border-top-style:solid;border-top-color:rgb(213,15,37);border-top-=
width:2px">Przemyslaw &quot;PK&quot; Krol |</td><td style=3D"border-top-sty=
le:solid;border-top-color:rgb(51,105,232);border-top-width:2px">=C2=A0Strat=
egic Network Engineer</td><td style=3D"border-top-style:solid;border-top-co=
lor:rgb(0,153,57);border-top-width:2px"><span style=3D"line-height:19px;whi=
te-space:normal"><span style=3D"border-top-width:2px;border-right-width:0px=
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r-right-style:solid;border-bottom-style:solid;border-left-style:solid;borde=
r-top-color:rgb(51,105,232);border-right-color:rgb(51,105,232);border-botto=
m-color:rgb(51,105,232);border-left-color:rgb(51,105,232);padding-top:2px;m=
argin-top:2px">ing |</span><span style=3D"border-top-width:2px;border-right=
-width:0px;border-bottom-width:0px;border-left-width:0px;border-top-style:s=
olid;border-right-style:solid;border-bottom-style:solid;border-left-style:s=
olid;border-top-color:rgb(0,153,57);border-right-color:rgb(0,153,57);border=
-bottom-color:rgb(0,153,57);border-left-color:rgb(0,153,57);padding-top:2px=
;margin-top:2px">=C2=A0<a href=3D"mailto:pkrol@google.com" target=3D"_blank=
"><font color=3D"#1155cc">pkrol@google.com</font></a>=C2=A0</span></span></=
td><td style=3D"border-top-style:solid;border-top-color:rgb(238,178,17);bor=
der-top-width:2px"><br></td></tr></tbody></table></div></div></div></div></=
div></div></div></div></div></div></div></div></div></div>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Przemyslaw Krol <pkrol=40google.com@dmarc.ietf.org>
CC: "pkrol@google.com" <pkrol@google.com>, "spring@ietf.org" <spring@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>
Thread-Topic: [spring] SR Policy draft update and its spin off drafts
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Date: Tue, 12 Jun 2018 16:13:09 +0000
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References: <7694dbc48d914ebba1a985f150b9190d@XCH-ALN-008.cisco.com> <CACH2EkWtpoF-JBvT0H1zdUj+=BVwNC-q9bmqkHw8-Wvix8vdMg@mail.gmail.com> <5dd3cd8d99b14e4b900bee534c6d9fa3@XCH-ALN-008.cisco.com> <CACH2EkXwxi-S8bSmBJ_wXEgYmdyf8kxFmcPv-jQ_xMpcPCy8qg@mail.gmail.com> <3d7e8a193d7148168879f3df18abe488@XCH-ALN-008.cisco.com>
In-Reply-To: <3d7e8a193d7148168879f3df18abe488@XCH-ALN-008.cisco.com>
From: Przemyslaw Krol <pkrol@google.com>
Date: Tue, 12 Jun 2018 09:21:55 -0700
Message-ID: <CACH2EkUd_uY3K5U0L5tKcykJan-wg1K-UWfXQEs80JnOoCbv=g@mail.gmail.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: Przemyslaw Krol <pkrol=40google.com@dmarc.ietf.org>, spring@ietf.org,  "spring-chairs@ietf.org" <spring-chairs@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/ujfpzjWQA66NzDEO6Nl6h7rMhVc>
Subject: Re: [spring] SR Policy draft update and its spin off drafts
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Hi Ketan,

Indeed, such clear terminology distinction would make it less confusing.

Thanks,

On Tue, Jun 12, 2018, 09:13 Ketan Talaulikar (ketant) <ketant@cisco.com>
wrote:

> Hi PK,
>
>
>
> The text in Sec 4 for the type 1 & 2 talk about =E2=80=9CSID resolution=
=E2=80=9D which is
> what I explained below.
>
>
>
> I believe you are talking about =E2=80=9Cpath resolution=E2=80=9D for a S=
ID (e.g. in most
> cases for the first segment). This is described in Sec 5.1.
>
>
>
> I would propose to use the terms =E2=80=9CSID resolution=E2=80=9D and =E2=
=80=9Cpath resolution=E2=80=9D
> where necessary to disambiguate these terms.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Przemyslaw Krol <pkrol=3D40google.com@dmarc.ietf.org>
> *Sent:* 12 June 2018 21:32
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* pkrol@google.com; spring@ietf.org; spring-chairs@ietf.org
> *Subject:* Re: [spring] SR Policy draft update and its spin off drafts
>
>
>
> Hi Ketan,
>
>
>
> > When the SR/MPLS label is specified directly then no resolution is
> required.
>
>
>
> Even if it's the top-most SID in the Segment List?
>
> By saying resolution i mean Label -> next-hop interface as per section
> 5..1:
>
>   o  The headend is unable to resolve the first SID into one or more
>
>       outgoing interface(s) and next-hop(s).
>
>
>
> thanks,
>
>
>
>
>
>
>
> On Tue, Jun 12, 2018 at 8:56 AM Ketan Talaulikar (ketant) <ketant=3D
> 40cisco.com@dmarc.ietf.org> wrote:
>
> Hi PK,
>
>
>
> The term =E2=80=9Cthis type=E2=80=9D in that block actually means =E2=80=
=9CType 1=E2=80=9D and not just
> reserved labels. When the SR/MPLS label is specified directly then no
> resolution is required. When the Segment is described with parameters (e.=
g.
> type 3 where the prefix address needs to be resolved to its Prefix SID
> label).
>
>
>
> The tuple should be <color,endpoint> as specified in Sec 2.1 and thanks
> for catching this miss. Will fix it in the next rev.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Przemyslaw Krol <pkrol=3D40google.com@dmarc.ietf.org>
> *Sent:* 12 June 2018 21:04
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* spring-chairs@ietf.org; spring@ietf.org
> *Subject:* Re: [spring] SR Policy draft update and its spin off drafts
>
>
>
> Hi Ketan, Authors
>
>
> 4
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01#=
section-4>.
> Segment Types
>
>   However, the SID-List itself
>
>    can be specified using different segment-descriptor *types* and the
>
>    following are currently defined:
>
>
>
>    *Type 1*: SR-MPLS Label:
>
> Additionally,
>
>          reserved labels like explicit-null or in general any MPLS label
>
>          may also be used.  e.g. *this type* can be used to specify a
>
>          label representation which maps to an optical transport path on
>
>          a packet transport node.  *This type* does not require the
>
>          headend to perform SID resolution.
>
>
>
>
>
> I assume 'this type' in SR-MPLS section really means 'reserved labels'
> whereas 'type' in section 4 introduction means segment types. Wouldn't it
> be more obvious to explicitly mention that 'Reserved labels' don't requir=
e
> resolution (contrary to Type 1: SR-MPLS unreserved labels)?
>
> Same probably applies to Type 2.
>
>
>
> Also, it may not be worth the hassle, but it seems throughout the documen=
t there is no consistency in terms of policy representation:
>
> <color, endpoint>
>
> vs
>
> <endpoint, color>
>
>
>
> thanks,
>
> pk
>
>
>
>
>
>
>
>
>
> On Tue, Jun 12, 2018 at 7:08 AM Ketan Talaulikar (ketant) <ketant=3D
> 40cisco.com@dmarc.ietf.org> wrote:
>
> Hello Chairs/WG,
>
> Would like to inform that the draft-ietf-spring-segment-routing-policy-01
> version has been posted earlier today with the focussed content as
> previously discussed on the mailing list.
>
> At this point, the authors of the
> draft-filsfils-spring-sr-traffic-counters and
> draft-filsfils-spring-sr-policy-considerations would like to request for
> their adoption by the WG.
>
> Given that the contents of these two drafts are entirely (almost verbatim=
)
> picked from the draft-filsfils-spring-segment-routing-policy-05 which was
> adopted by the WG, the text and topics covered in them are already famili=
ar
> to the WG. While perhaps the expression of interest to work on these topi=
cs
> was conveyed as part of the adoption call on the combined version of that
> document, a more formal adoption request and call for these two drafts
> seems more appropriate.
>
> Thanks,
> Ketan (on behalf of co-authors of the two drafts)
>
> -----Original Message-----
> From: spring <spring-bounces@ietf.org> On Behalf Of
> internet-drafts@ietf.org
> Sent: 12 June 2018 10:16
> To: i-d-announce@ietf.org
> Cc: spring@ietf.org
> Subject: [spring] I-D Action:
> draft-ietf-spring-segment-routing-policy-01.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Source Packet Routing in Networking WG o=
f
> the IETF.
>
>         Title           : Segment Routing Policy Architecture
>         Authors         : Clarence Filsfils
>                           Siva Sivabalan
>                           Daniel Voyer
>                           Alex Bogdanov
>                           Paul Mattes
>         Filename        : draft-ietf-spring-segment-routing-policy-01.txt
>         Pages           : 33
>         Date            : 2018-06-11
>
> Abstract:
>    Segment Routing (SR) allows a headend node to steer a packet flow
>    along any path.  Intermediate per-flow states are eliminated thanks
>    to source routing.  The headend node steers a flow into an SR Policy.
>    The header of a packet steered in an SR Policy is augmented with an
>    ordered list of segments associated with that SR Policy.  This
>    document details the concepts of SR Policy and steering into an SR
>    Policy.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-policy=
/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01
>
> https://datatracker..ietf.org/doc/html/draft-ietf-spring-segment-routing-=
policy-01
> <https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-=
policy-01>
>
> A diff from the previous version is available at:
>
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-pol=
icy-01
>
>
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp..ietf.org/internet-drafts/ <ftp://ftp.ietf.org/internet-drafts/=
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>
>
>
> --
>
> Przemyslaw "PK" Krol |
>
>  Strategic Network Engineer
>
> ing | pkrol@google.com
>
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>
>
>
> --
>
> Przemyslaw "PK" Krol |
>
>  Strategic Network Engineer
>
> ing | pkrol@google.com
>
>
>

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<div dir=3D"auto">Hi Ketan,<div dir=3D"auto"><br></div><div dir=3D"auto">In=
deed, such clear terminology distinction would make it less confusing.</div=
><div dir=3D"auto"><br></div><div dir=3D"auto">Thanks,</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Jun 12, 2018, 09:13 Ketan Ta=
laulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com">ketant@cisco.com<=
/a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_3965744396513370218WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi PK,<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The text in Sec 4 for =
the type 1 &amp; 2 talk about =E2=80=9CSID resolution=E2=80=9D which is wha=
t I explained below.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">I believe you are talk=
ing about =E2=80=9Cpath resolution=E2=80=9D for a SID (e.g. in most cases f=
or the first segment). This is described in Sec 5.1.<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">I would propose to use=
 the terms =E2=80=9CSID resolution=E2=80=9D and =E2=80=9Cpath resolution=E2=
=80=9D where necessary to disambiguate these terms.<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks,<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Ketan<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Przemyslaw Krol &lt;pkrol=3D<a=
 href=3D"mailto:40google.com@dmarc.ietf.org" target=3D"_blank" rel=3D"noref=
errer">40google.com@dmarc.ietf.org</a>&gt;
<br>
<b>Sent:</b> 12 June 2018 21:32<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank" rel=3D"noreferrer">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:pkrol@google.com" target=3D"_blank" rel=3D"nor=
eferrer">pkrol@google.com</a>; <a href=3D"mailto:spring@ietf.org" target=3D=
"_blank" rel=3D"noreferrer">spring@ietf.org</a>; <a href=3D"mailto:spring-c=
hairs@ietf.org" target=3D"_blank" rel=3D"noreferrer">spring-chairs@ietf.org=
</a><br>
<b>Subject:</b> Re: [spring] SR Policy draft update and its spin off drafts=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi Ketan,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">&gt;=C2=A0When the SR/MPLS label is specified direct=
ly then no resolution is required.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Even if it&#39;s the top-most SID in the Segment Lis=
t?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">By saying resolution i mean Label -&gt; next-hop int=
erface as per section 5..1:<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 o=C2=A0 The headend is unable to resolve the =
first SID into one or more<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0 =C2=A0 outgoing interface(s) and next-=
hop(s).<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">thanks,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Tue, Jun 12, 2018 at 8:56 AM Ketan Talaulikar (ke=
tant) &lt;ketant=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"=
_blank" rel=3D"noreferrer">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<u></u>=
<u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi PK,</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The term =E2=80=9Cthis=
 type=E2=80=9D in that block actually means =E2=80=9CType 1=E2=80=9D and no=
t just reserved labels.
 When the SR/MPLS label is specified directly then no resolution is require=
d. When the Segment is described with parameters (e.g. type 3 where the pre=
fix address needs to be resolved to its Prefix SID label).</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The tuple should be &l=
t;color,endpoint&gt; as specified in Sec 2.1 and thanks for catching this
 miss. Will fix it in the next rev.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks,</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Ketan</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Przemyslaw Krol &lt;pkrol=3D<a=
 href=3D"mailto:40google.com@dmarc.ietf.org" target=3D"_blank" rel=3D"noref=
errer">40google.com@dmarc.ietf.org</a>&gt;
<br>
<b>Sent:</b> 12 June 2018 21:04<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank" rel=3D"noreferrer">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:spring-chairs@ietf.org" target=3D"_blank" rel=
=3D"noreferrer">spring-chairs@ietf.org</a>;
<a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer">spr=
ing@ietf.org</a><br>
<b>Subject:</b> Re: [spring] SR Policy draft update and its spin off drafts=
</span><u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Ketan, Authors<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<h2 style=3D"white-space:pre-wrap"><a name=3D"m_3965744396513370218_m_-2589=
76301946406925_m_2203292675870289" rel=3D"noreferrer"></a><a href=3D"https:=
//tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01#section-4=
" target=3D"_blank" rel=3D"noreferrer"><span style=3D"font-size:10.0pt;font=
-family:&quot;Arial&quot;,sans-serif;color:black;text-decoration:none">4</s=
pan></a><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-=
serif;color:black">.=C2=A0
 Segment Types</span><u></u><u></u></h2>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 However, the SID-List itself</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0can be specified using different segment-descriptor
<b>types</b> and the</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0following are currently defined:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0<b>Type 1</b>: SR-MPLS Label:</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Additionally,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0reserved labels like explicit-null o=
r in general any MPLS label</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0may also be used.=C2=A0 e.g.
<b>this type</b> can be used to specify a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0label representation which maps to a=
n optical transport path on</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a packet transport node.=C2=A0
<b>This type</b> does not require the</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0headend to perform SID resolution.</=
span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I assume &#39;this type&#39; in SR-MPLS section real=
ly means &#39;reserved labels&#39; whereas &#39;type&#39; in section 4 intr=
oduction means segment types. Wouldn&#39;t it be more obvious to explicitly=
 mention
 that &#39;Reserved labels&#39; don&#39;t require resolution (contrary to T=
ype 1: SR-MPLS unreserved labels)?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Same probably applies to Type 2.=C2=A0<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">Also, it may not be worth the hassle, but it seems throughout t=
he document there is no consistency in terms of policy representation:</spa=
n><u></u><u></u></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">&lt;color, endpoint&gt; </span><u></u><u></u></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">vs</span><u></u><u></u></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"font-family:&quot;Arial&quot;,sans-serif;c=
olor:black">&lt;endpoint, color&gt;</span><u></u><u></u></pre>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">thanks,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">pk<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Tue, Jun 12, 2018 at 7:08 AM Ketan Talaulikar (ke=
tant) &lt;ketant=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"=
_blank" rel=3D"noreferrer">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<u></u>=
<u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal">Hello Chairs/WG,<br>
<br>
Would like to inform that the draft-ietf-spring-segment-routing-policy-01 v=
ersion has been posted earlier today with the focussed content as previousl=
y discussed on the mailing list.<br>
<br>
At this point, the authors of the draft-filsfils-spring-sr-traffic-counters=
 and draft-filsfils-spring-sr-policy-considerations would like to request f=
or their adoption by the WG.<br>
<br>
Given that the contents of these two drafts are entirely (almost verbatim) =
picked from the draft-filsfils-spring-segment-routing-policy-05 which was a=
dopted by the WG, the text and topics covered in them are already familiar =
to the WG. While perhaps the expression
 of interest to work on these topics was conveyed as part of the adoption c=
all on the combined version of that document, a more formal adoption reques=
t and call for these two drafts seems more appropriate.<br>
<br>
Thanks,<br>
Ketan (on behalf of co-authors of the two drafts)<br>
<br>
-----Original Message-----<br>
From: spring &lt;<a href=3D"mailto:spring-bounces@ietf.org" target=3D"_blan=
k" rel=3D"noreferrer">spring-bounces@ietf.org</a>&gt; On Behalf Of
<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank" rel=3D"norefe=
rrer">internet-drafts@ietf.org</a><br>
Sent: 12 June 2018 10:16<br>
To: <a href=3D"mailto:i-d-announce@ietf.org" target=3D"_blank" rel=3D"noref=
errer">i-d-announce@ietf.org</a><br>
Cc: <a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer"=
>spring@ietf.org</a><br>
Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-policy-01.t=
xt<br>
<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Source Packet Routing in Networking WG of =
the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Segment Routing Policy Architecture<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Clar=
ence Filsfils<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Siva Sivabalan<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Daniel Voyer<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Alex Bogdanov<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Paul Mattes<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-spring-segment-routing-policy-01.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 33<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2018-06-11<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Segment Routing (SR) allows a headend node to steer a packet f=
low<br>
=C2=A0 =C2=A0along any path.=C2=A0 Intermediate per-flow states are elimina=
ted thanks<br>
=C2=A0 =C2=A0to source routing.=C2=A0 The headend node steers a flow into a=
n SR Policy.<br>
=C2=A0 =C2=A0The header of a packet steered in an SR Policy is augmented wi=
th an<br>
=C2=A0 =C2=A0ordered list of segments associated with that SR Policy.=C2=A0=
 This<br>
=C2=A0 =C2=A0document details the concepts of SR Policy and steering into a=
n SR<br>
=C2=A0 =C2=A0Policy.<br>
<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routi=
ng-policy/" target=3D"_blank" rel=3D"noreferrer">https://datatracker.ietf.o=
rg/doc/draft-ietf-spring-segment-routing-policy/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-po=
licy-01" target=3D"_blank" rel=3D"noreferrer">https://tools.ietf.org/html/d=
raft-ietf-spring-segment-routing-policy-01</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-=
routing-policy-01" target=3D"_blank" rel=3D"noreferrer">https://datatracker=
..ietf.org/doc/html/draft-ietf-spring-segment-routing-policy-01</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-segment-ro=
uting-policy-01" target=3D"_blank" rel=3D"noreferrer">https://www.ietf.org/=
rfcdiff?url2=3Ddraft-ietf-spring-segment-routing-policy-01</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at
<a href=3D"http://tools.ietf.org" target=3D"_blank" rel=3D"noreferrer">tool=
s.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" target=3D"_blank" rel=3D"no=
referrer">ftp://ftp..ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer">spr=
ing@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank" =
rel=3D"noreferrer">https://www.ietf.org/mailman/listinfo/spring</a><br>
<br>
_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer">spr=
ing@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank" =
rel=3D"noreferrer">https://www.ietf.org/mailman/listinfo/spring</a><u></u><=
u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal">--
<u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin-top:7.5pt">
<table class=3D"m_3965744396513370218MsoNormalTable" border=3D"0" cellspaci=
ng=3D"0" cellpadding=3D"0">
<tbody>
<tr>
<td style=3D"border:none;border-top:solid #d50f25 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">Przemyslaw &quot;PK&quot; Krol |</span><u></u><u></u></p=
>
</td>
<td style=3D"border:none;border-top:solid #3369e8 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">=C2=A0Strategic Network Engineer</span><u></u><u></u></p=
>
</td>
<td style=3D"border:none;border-top:solid #009939 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555;border:solid #3369e8 1.5pt;padding:2.0pt">ing |</span><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;color:#555555;border:s=
olid #009939 1.5pt;padding:2.0pt">=C2=A0<a href=3D"mailto:pkrol@google.com"=
 target=3D"_blank" rel=3D"noreferrer"><span style=3D"color:#1155cc">pkrol@g=
oogle.com</span></a>=C2=A0</span><u></u><u></u></p>
</td>
<td style=3D"border:none;border-top:solid #eeb211 1.5pt;padding:0cm 0cm 0cm=
 0cm"></td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org" target=3D"_blank" rel=3D"noreferrer">spr=
ing@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" target=3D"_blank" =
rel=3D"noreferrer">https://www.ietf.org/mailman/listinfo/spring</a><u></u><=
u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><br clear=3D"all">
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal">-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin-top:7.5pt">
<table class=3D"m_3965744396513370218MsoNormalTable" border=3D"0" cellspaci=
ng=3D"0" cellpadding=3D"0">
<tbody>
<tr>
<td style=3D"border:none;border-top:solid #d50f25 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">Przemyslaw &quot;PK&quot; Krol |<u></u><u></u></span></p=
>
</td>
<td style=3D"border:none;border-top:solid #3369e8 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555">=C2=A0Strategic Network Engineer<u></u><u></u></span></p=
>
</td>
<td style=3D"border:none;border-top:solid #009939 1.5pt;padding:0cm 0cm 0cm=
 0cm">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:#555555;border:solid #3369e8 1.5pt;padding:2.0pt">ing |</span><sp=
an style=3D"font-family:&quot;Arial&quot;,sans-serif;color:#555555;border:s=
olid #009939 1.5pt;padding:2.0pt">=C2=A0<a href=3D"mailto:pkrol@google.com"=
 target=3D"_blank" rel=3D"noreferrer"><span style=3D"color:#1155cc">pkrol@g=
oogle.com</span></a>=C2=A0</span><span style=3D"font-family:&quot;Arial&quo=
t;,sans-serif;color:#555555"><u></u><u></u></span></p>
</td>
<td style=3D"border:none;border-top:solid #eeb211 1.5pt;padding:0cm 0cm 0cm=
 0cm"></td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

</blockquote></div>

--000000000000752d75056e7444ac--


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Date: Tue, 12 Jun 2018 11:16:13 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Rob Shakir <robjs@google.com>
CC: SPRING WG List <spring@ietf.org>
Message-ID: <FCA644E1-D68B-439F-BB85-3A758254B0B1@gmail.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Updating the SPRING WG Charter
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Rob,

=20

Sorry for the delay, please see inline.

Thanks!

=20

Cheers,

Jeff

From: Rob Shakir <robjs@google.com>
Date: Sunday, June 3, 2018 at 14:36
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] Updating the SPRING WG Charter

=20

Hi Jeff,

=20

Thanks for the comments.

=20

On Fri, Jun 1, 2018 at 9:44 AM Jeff Tantsura <jefftant.ietf@gmail.com> wrot=
e:

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of

Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6).

[jeff] I=E2=80=99d add =E2=80=9Cdataplanes=E2=80=9D

=20

robjs> I don't think that SPRING should limit itself to having to just work=
 on dataplane technologies. The functional specifications or architectures t=
hat are proposed are likely to span both data, control, and management plane=
s (e.g., YANG models, counter specifications). I'd be interested if you disa=
gree?

[jeff] I absolutely agree with you that the work should have all abovementi=
oned planes, it is more to how the sentence reads, I meant not to limit the =
works to dataplane only but a common convention, when we say SR-MPLS we real=
ly mean SR with MPLS data plane, same for SRv6

=20

*snip*

=20

o Using SR

[jeff] SR conveyed metadata perhaps? Think of BSID x-connect into another l=
ayer

=20

robjs> I'd argue that this is more than metadata, it's really a forwarding =
instruction that says to send to some other layer, or that is interpreted in=
 another domain. Metadata to me would mean information that we're carrying o=
n the packet that *isn't* used for forwarding.

[jeff] we=E2=80=99d disagree on this one, I would not consider setting the contex=
t (ie where to lookup) as a forwarding instruction =C2=A0

=20

*snip*

     * lsr on OSPF and IS-IS extensions to flood SPRING-related information

[jeff] in RIFT we plan to support SR as well

=20

robjs> This is probably RIFT co-ordinating with SPRING. I'd rather avoid li=
sting another protocol here without there being SPRING work that affects it.=
 Of course, please do involve SPRING in discussions of SR support in RIFT.

[jeff] Ack

=20

*snip*

     * teas on generic traffic engineering architecture

[jeff] rtgwg for fast convergence related topics

=20

robjs> Thanks -- yes, given all the work in rtgwg on this topic, this shoul=
d definitely be added.

[jeff] thanks!

=20

Thanks,

r.

=20


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<html xmlns:o=3D"urn:schemas-microsoft-com:office:office" xmlns:w=3D"urn:schema=
s-microsoft-com:office:word" xmlns:m=3D"http://schemas.microsoft.com/office/20=
04/12/omml" xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta http-equiv=3DC=
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple><div class=3DWordSe=
ction1><p class=3DMsoNormal>Rob,<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;<=
/o:p></p><p class=3DMsoNormal>Sorry for the delay, please see inline.<o:p></o:=
p></p><p class=3DMsoNormal>Thanks!<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp=
;</o:p></p><div><p class=3DMsoNormal><span style=3D'color:black'>Cheers,<o:p></o=
:p></span></p></div><p class=3DMsoNormal><span style=3D'color:black'>Jeff</span>=
<o:p></o:p></p><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;paddin=
g:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'font-size:12.0pt;col=
or:black'>From: </span></b><span style=3D'font-size:12.0pt;color:black'>Rob Sh=
akir &lt;robjs@google.com&gt;<br><b>Date: </b>Sunday, June 3, 2018 at 14:36<=
br><b>To: </b>Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt;<br><b>Cc: </b>SP=
RING WG List &lt;spring@ietf.org&gt;<br><b>Subject: </b>Re: [spring] Updatin=
g the SPRING WG Charter<o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal><a name=3D"_MailOriginalBody=
">Hi Jeff,<o:p></o:p></a></p><div><p class=3DMsoNormal><span style=3D'mso-bookma=
rk:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'>Thanks for the comments.<o:=
p></o:p></span></p><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOr=
iginalBody'><o:p>&nbsp;</o:p></span></p><div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'>On Fri, Jun 1, 2018 at 9:44 AM Jeff Ta=
ntsura &lt;</span><a href=3D"mailto:jefftant.ietf@gmail.com"><span style=3D'mso-=
bookmark:_MailOriginalBody'>jefftant.ietf@gmail.com</span><span style=3D'mso-b=
ookmark:_MailOriginalBody'></span></a><span style=3D'mso-bookmark:_MailOrigina=
lBody'>&gt; wrote:<o:p></o:p></span></p></div><blockquote style=3D'border:none=
;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt=
;margin-right:0in'><div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBody'>=
<o:p>&nbsp;</o:p></span></p></div></div><div><div><div><div><div><p class=3DMs=
oNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>=
The Source Packet Routing in NetworkinG (SPRING) Working Group is the home o=
f</span><o:p></o:p></span></p></div></div></div></div></div><div><div><div><=
div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom=
-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fa=
mily:"Courier New"'>Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6=
).</span><o:p></o:p></span></p></div></div></div></div></div><div><div><div>=
<div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-botto=
m-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBody'>[jeff] I=E2=80=99d add =E2=80=
=9Cdataplanes=E2=80=9D<o:p></o:p></span></p></div></div></div></div></div></blockquo=
te><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p=
>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookm=
ark:_MailOriginalBody'>robjs&gt; I don't think that SPRING should limit itse=
lf to having to just work on dataplane technologies. The functional specific=
ations or architectures that are proposed are likely to span both data, cont=
rol, and management planes (e.g., YANG models, counter specifications). I'd =
be interested if you disagree?<o:p></o:p></span></p><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'>[jeff] I absolutely agree with you t=
hat the work should have all abovementioned planes, it is more to how the se=
ntence reads, I meant not to limit the works to dataplane only but a common =
convention, when we say SR-MPLS we really mean SR with MPLS data plane, same=
 for SRv6<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt=
;margin-left:4.8pt;margin-right:0in'><div><div><p class=3DMsoNormal style=3D'mso=
-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'mso-bookmark:_=
MailOriginalBody'><span style=3D'font-family:"Courier New"'>*snip*</span><o:p>=
</o:p></span></p></div></div><div><div><div><div><div><p class=3DMsoNormal sty=
le=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'mso-boo=
kmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div></div></div></div=
></div><div><div><div><div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt=
:auto;mso-margin-bottom-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBod=
y'><span style=3D'font-family:"Courier New"'>o Using SR</span><o:p></o:p></spa=
n></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto'><span style=3D'mso-bookmark:_MailOriginalBody'>[jeff] SR conveyed meta=
data perhaps? Think of BSID x-connect into another layer<o:p></o:p></span></=
p></div></div></div></div></div></blockquote><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>robjs&gt; I=
'd argue that this is more than metadata, it's really a forwarding instructi=
on that says to send to some other layer, or that is interpreted in another =
domain. Metadata to me would mean information that we're carrying on the pac=
ket that *isn't* used for forwarding.<o:p></o:p></span></p><p class=3DMsoNorma=
l><span style=3D'mso-bookmark:_MailOriginalBody'>[jeff] we=E2=80=99d disagree on thi=
s one, I would not consider setting the context (ie where to lookup) as a fo=
rwarding instruction =C2=A0<o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></di=
v><blockquote style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in=
 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><div><div>=
<p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto=
'><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Cou=
rier New"'>*snip*</span><o:p></o:p></span></p></div></div></div></div></div>=
<div><div><div><div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBody'><spa=
n style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;&nbsp; * lsr on OSPF a=
nd IS-IS extensions to flood SPRING-related information</span><o:p></o:p></s=
pan></p></div></div></div></div></div><div><div><div><div><div><p class=3DMsoN=
ormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=
=3D'mso-bookmark:_MailOriginalBody'>[jeff] in RIFT we plan to support SR as we=
ll<o:p></o:p></span></p></div></div></div></div></div></blockquote><div><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'>robjs&gt; This is probably RIFT co-ordinating with SPRING. I'd ra=
ther avoid listing another protocol here without there being SPRING work tha=
t affects it. Of course, please do involve SPRING in discussions of SR suppo=
rt in RIFT.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'>[jeff] Ack<o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span>=
</p></div><blockquote style=3D'border:none;border-left:solid #CCCCCC 1.0pt;pad=
ding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><div><d=
iv><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto'><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fam=
ily:"Courier New"'>*snip*</span><o:p></o:p></span></p></div></div></div></di=
v></div><div><div><div><div><div><p class=3DMsoNormal style=3D'mso-margin-top-al=
t:auto;mso-margin-bottom-alt:auto'><span style=3D'mso-bookmark:_MailOriginalBo=
dy'><span style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp;&nbsp; * teas =
on generic traffic engineering architecture</span><o:p></o:p></span></p></di=
v></div></div></div></div><div><div><div><div><div><p class=3DMsoNormal style=3D=
'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'mso-bookma=
rk:_MailOriginalBody'>[jeff] rtgwg for fast convergence related topics<o:p><=
/o:p></span></p></div></div></div></div></div></blockquote><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;</o:p></span>=
</p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBod=
y'>robjs&gt; Thanks -- yes, given all the work in rtgwg on this topic, this =
should definitely be added.<o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'>[jeff] thanks!<o:p></o:p></span></p></d=
iv><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p=
>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookm=
ark:_MailOriginalBody'>Thanks,<o:p></o:p></span></p></div><div><p class=3DMsoN=
ormal><span style=3D'mso-bookmark:_MailOriginalBody'>r.<o:p></o:p></span></p><=
/div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o=
:p>&nbsp;</o:p></span></p></div></div></div></div></div></div></body></html>

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Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
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https://www.ietf.org/mailman/listinfo/idr


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From: LUIS MIGUEL CONTRERAS MURILLO <luismiguel.contrerasmurillo@telefonica.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
Thread-Topic: [spring] draft-xu-mpls-sr-over-ip
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Date: Wed, 13 Jun 2018 06:19:29 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/qQLSa_WxpZbOMUj4rHZWSt3NSl0>
Subject: Re: [spring] draft-xu-mpls-sr-over-ip
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Hi Loa

I'm not aware of any IPR that applies to this draft.

Thanks,

Luis
__________________________________
Luis M. Contreras

Technology and Planning
Transport, IP and Interconnection Networks
Telef=F3nica I+D / Global CTIO unit / Telef=F3nica

Distrito Telef=F3nica, Edificio Sur 3, Planta 3
28050 Madrid
Espa=F1a / Spain

Skype (Lync): +34 91 312 9084
Mobile: +34 680 947 650
luismiguel.contrerasmurillo@telefonica.com

-----Mensaje original-----
De: spring <spring-bounces@ietf.org> En nombre de Loa Andersson
Enviado el: jueves, 7 de junio de 2018 12:15
Para: mpls@ietf.org
CC: spring@ietf.org; mpls-chairs@ietf.org; draft-xu-mpls-sr-over-ip@ietf.or=
g
Asunto: [spring] draft-xu-mpls-sr-over-ip



Working Group,

We are currently preparing draft draft-xu-mpls-sr-over-ip for working
group adoption.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?

If so, has this IPR been disclosed in compliance with IETF IPR rules
(see RFCs 3979, 4879, 3669 and 5378 for more details).

There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.

If you are listed as a document author or contributor please respond to
this email regardless of whether or not you are aware of any relevant
IPR. *The response needs to be sent to the MPLS WG mailing list.* The
document will not advance to the next stage until a response has been
received from each author and contributor.

If you are on the MPLS WG email list but are not listed as an author or
contributor, then please explicitly respond only if you are aware of any
IPR that has not yet been disclosed in conformance with IETF rules.

We have copied this mail to the SPRING wg mailing list for information.
If you receive this mail over the SPRING wg mailing list, and are aware
of IPRs that apply to the draft, please notify the MPLS wg list.


/Loa
  mpls wg co-chair
--


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
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Subject: Re: [spring] draft-xu-mpls-sr-over-ip
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Hi Loa,

I am not aware of any IPR related to this draft.

Best regards,
Gunter Van de Velde

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Thursday, June 7, 2018 12:15
To: mpls@ietf.org
Cc: spring@ietf.org; mpls-chairs@ietf.org; draft-xu-mpls-sr-over-ip@ietf.or=
g
Subject: [spring] draft-xu-mpls-sr-over-ip

Working Group,

We are currently preparing draft draft-xu-mpls-sr-over-ip for working group=
 adoption.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?

If so, has this IPR been disclosed in compliance with IETF IPR rules (see R=
FCs 3979, 4879, 3669 and 5378 for more details).

There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.

If you are listed as a document author or contributor please respond to thi=
s email regardless of whether or not you are aware of any relevant IPR. *Th=
e response needs to be sent to the MPLS WG mailing list.* The document will=
 not advance to the next stage until a response has been received from each=
 author and contributor.

If you are on the MPLS WG email list but are not listed as an author or con=
tributor, then please explicitly respond only if you are aware of any IPR t=
hat has not yet been disclosed in conformance with IETF rules.

We have copied this mail to the SPRING wg mailing list for information.
If you receive this mail over the SPRING wg mailing list, and are aware of =
IPRs that apply to the draft, please notify the MPLS wg list.


/Loa
  mpls wg co-chair
--=20


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

_______________________________________________
spring mailing list
spring@ietf.org
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To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Hi Loa,

I am not aware of any IPR related to this document.

Best regards,
Mach=20

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Thursday, June 07, 2018 6:15 PM
> To: mpls@ietf.org
> Cc: spring@ietf.org; mpls-chairs@ietf.org; draft-xu-mpls-sr-over-ip@ietf.=
org
> Subject: [mpls] draft-xu-mpls-sr-over-ip
>=20
> Working Group,
>=20
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working gro=
up
> adoption.
>=20
> Part of this preparation is to do an IPR poll.
>=20
> This mail is to start the IPR poll.
>=20
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>=20
> If so, has this IPR been disclosed in compliance with IETF IPR rules (see=
 RFCs
> 3979, 4879, 3669 and 5378 for more details).
>=20
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>=20
> If you are listed as a document author or contributor please respond to t=
his
> email regardless of whether or not you are aware of any relevant IPR. *Th=
e
> response needs to be sent to the MPLS WG mailing list.* The document will=
 not
> advance to the next stage until a response has been received from each au=
thor
> and contributor.
>=20
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any =
IPR that
> has not yet been disclosed in conformance with IETF rules.
>=20
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware o=
f IPRs
> that apply to the draft, please notify the MPLS wg list.
>=20
>=20
> /Loa
>   mpls wg co-chair
> --
>=20
>=20
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


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From: Tal Mizrahi <tal.mizrahi.phd@gmail.com>
Date: Wed, 13 Jun 2018 11:08:55 +0300
Message-ID: <CABUE3X=tPYKo8MOmpn-Y0K=qGjBB+rQP_1eUxjt77ssDwobvHw@mail.gmail.com>
To: Loa Andersson <loa@pi.nu>
Cc: "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>,  "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,  "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Subject: Re: [spring] [mpls] draft-xu-mpls-sr-over-ip
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--000000000000815a1a056e817e6f
Content-Type: text/plain; charset="UTF-8"

As a contributor, I am not aware of any IPRs related to this document.

Thanks,
Tal.

On Thu, Jun 7, 2018 at 1:15 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
> /Loa
>  mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000815a1a056e817e6f
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<div dir=3D"ltr">As a contributor, I am not aware of any IPRs related to th=
is document.<div><br></div><div>Thanks,</div><div>Tal.</div></div><div clas=
s=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Jun 7, 2018 at 1:1=
5 PM, Loa Andersson <span dir=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" targ=
et=3D"_blank">loa@pi.nu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">Working Group,<br>
<br>
We are currently preparing draft draft-xu-mpls-sr-over-ip for working<br>
group adoption.<br>
<br>
Part of this preparation is to do an IPR poll.<br>
<br>
This mail is to start the IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.<br=
>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS WG mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
We have copied this mail to the SPRING wg mailing list for information.<br>
If you receive this mail over the SPRING wg mailing list, and are aware<br>
of IPRs that apply to the draft, please notify the MPLS wg list.<br>
<br>
<br>
/Loa<br>
=C2=A0mpls wg co-chair<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

--000000000000815a1a056e817e6f--


From nobody Wed Jun 13 01:24:58 2018
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To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/LwS5yn8Iv2IJKX5lEgDkzc_ZpV8>
Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding=20
seems to make little sense and only bring confusion (router/controller impl=
ementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)=20
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))=20
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators=20
* most simple solution for implementers (routers and controller) =20
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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https://www.ietf.org/mailman/listinfo/idr


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Date: Wed, 13 Jun 2018 08:45:26 +0000
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Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding seems to make little sense and only bring confusi=
on (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/yy9vb-gvrnZXRsgsh3mNiWBWRug>
Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are =
signaled for ISIS, OSPF and BGP-LS.=20

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then ne=
xt, have a look into how to encode the TLV so that we have a clean technolo=
gical solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding seems to make little sense and only bring confusi=
on (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr


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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/w0ZmOAcDf_TUUWLkeFk_E6jzQm4>
Subject: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-14
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Dear authors,

I've read the document and have one minor comment and 3 editorials/nits, se=
e below. As a general comment from a non-native speaker I'd suggest a revie=
w by a native speaker (noting that one of the authors is a native speaker).=
 I went through that with some of the informational rfcs I've edited and I =
think it helps to improve readability of a standards track rfc.

I appreciate, that the tie-break section is part of the draft. I admit that=
 I hardly can judge whether that is the right way of doing things. Here I r=
ely on the judgement of the authors and contributors.

Related to contents, I think the editor & authors did a good job and the dr=
aft is ready for publication.

Regards,

Ruediger


Comments:

Section 2.4

   Local segments MAY be allocated from the Segment Routing Local Block
   (SRLB) [I-D.ietf-spring-segment-routing] or from any unused label as
   long as it does not use a reserved label. The SRLB consists of the
   range of local labels reserved by the node for certain local
   segments.

Would that read better, if the SRLB is defined before label allocation is s=
pecified, i.e., switch sentences:

   The SRLB consists of the
   range of local labels reserved by the node for certain local
   segments. Local segments MAY be allocated from the Segment Routing Local=
 Block
   (SRLB) [I-D.ietf-spring-segment-routing] or from any unused label as
   long as it does not use a reserved label.

#################

2.6. Outgoing Label Collision

2nd section
the ingress node may not have exactly have the
   same data

Delete the second "have".

##################

3.1. Example 1

Last para, last sentence

The ECMP-awareness ensures that the traffic be load-shared between any ECMP
   path, in this case the two north and south links between R2 and R3.

R2 has two links to R2 and R3, one of which is the north link, while the ot=
her is the south link. Suggest to rewrite to:

...ECMP path, in this case the two links between R2 and R3.

Or

...ECMP path, in this case the north and south links between R2 and R3.

###################

3.2. Example 2

Suppose the right most router R0 wants.....

R0 is the leftmost router

####################

Von: spring [mailto:spring-bounces@ietf.org] Im Auftrag von bruno.decraene@=
orange.com
Gesendet: Donnerstag, 7. Juni 2018 18:52
An: SPRING WG List <spring@ietf.org>
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Betreff: Re: [spring] WG Last Call for draft-ietf-spring-segment-routing-mp=
ls-13

Hi all,

A quick update on the status of this WGLC:

- All the authors have responded about IPR (thank you!). Still missing repl=
ies from some contributors (Wim, Edward, Igor, Saku). I've sent them a remi=
nder this Monday.
- Two people (Zafar, Adrian) have responded supporting publication.
- No opposition.
- Two persons have sent comments (Adrian, myself). Thanks Adrian.
- Authors have not replied to any comment so far.
- The WGLC period was scheduled to end tomorrow.

I wish we had more support, reviews, and authors' involvement to reply to r=
eviews.

The WGLC is extended by a week. Please review the document and send your co=
mments to the list, no later than *June 15*

Thank you,
--Bruno

From: bruno.decraene@orange.com<mailto:bruno.decraene@orange.com> [mailto:b=
runo.decraene@orange.com]
Sent: Thursday, May 24, 2018 7:14 PM
To: SPRING WG List
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org<mailto:draft-ietf-sprin=
g-segment-routing-mpls@ietf.org>
Subject: WG Last Call for draft-ietf-spring-segment-routing-mpls-13


Hello Working Group,



This email starts a Working Group Last Call on draft-ietf-spring-segment-ro=
uting-mpls-13 [1] which is considered mature and ready for a final working =
group review.



Please read this document if you haven't read the most recent version yet, =
and send your comments to the list, no later than *June 08*.



As a reminder, this document had already passed a WGLC more than a year ago=
 on version -06 [2], had been sent to the AD but then returned to the WG.

Since then, the document has significantly changed, so please read it again=
. In particular, it now includes the resolution in case of incoming label c=
ollision. Hence it killed draft-ietf-spring-conflict-resolution.



Both co-chairs co-author this document, hence:

- Shraddha has agreed to be the document shepherd.. Thank you Shraddha.

- Martin, our AD, has agreed to evaluate the WG consensus.



Thank you,

Bruno, Rob



[1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13

[2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7=
Y



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear authors,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;ve read the document an=
d have one minor comment and 3 editorials/nits, see below. As a general com=
ment from a non-native speaker I&#8217;d suggest a review by a native speak=
er (noting that one of the authors is a native speaker).
 I went through that with some of the informational rfcs I&#8217;ve edited =
and I think it helps to improve readability of a standards track rfc.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I appreciate, that the tie-brea=
k section is part of the draft. I admit that I hardly can judge whether tha=
t is the right way of doing things. Here I rely on the judgement of the aut=
hors and contributors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Related to contents, I think th=
e editor &amp; authors did a good job and the draft is ready for publicatio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Ruediger<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Comments:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Section 2.4 <o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; Local segments MAY=
 be allocated from the Segment Routing Local Block<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; (SRLB) [I-D.ietf-s=
pring-segment-routing] or from any unused label as<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; long as it does no=
t use a reserved label. The SRLB consists of the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; range of local lab=
els reserved by the node for certain local<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; segments.&nbsp; <o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Would that read better, if the =
SRLB is defined before label allocation is specified, i.e., switch sentence=
s:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; The SRLB consists =
of the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; range of local lab=
els reserved by the node for certain local<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; segments. Local se=
gments MAY be allocated from the Segment Routing Local Block<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; (SRLB) [I-D.ietf-s=
pring-segment-routing] or from any unused label as<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; long as it does no=
t use a reserved label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">#################<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">2.6. Outgoing Label Collision<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">2<sup>nd</sup> section<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">the ingress node may not have e=
xactly have the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; same data<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Delete the second &#8220;have&#=
8221;.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">##################<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">3.1. Example 1<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Last para, last sentence<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The ECMP-awareness ensures that=
 the traffic be load-shared between any ECMP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; path, in this case=
 the two north and south links between R2 and R3.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">R2 has two links to R2 and R3, =
one of which is the north link, while the other is the south link. Suggest =
to rewrite to:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&#8230;ECMP path, in this case =
the two links between R2 and R3.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Or<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&#8230;ECMP path, in this case =
the north and south links between R2 and R3.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">###################<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">3.2. Example 2<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Suppose the right most router R=
0 wants&#8230;..<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">R0 is the leftmost router<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">####################<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-language:DE">Von:</spa=
n></b><span style=3D"mso-fareast-language:DE"> spring [mailto:spring-bounce=
s@ietf.org]
<b>Im Auftrag von </b>bruno.decraene@orange.com<br>
<b>Gesendet:</b> Donnerstag, 7. </span><span lang=3D"EN-US" style=3D"mso-fa=
reast-language:DE">Juni 2018 18:52<br>
<b>An:</b> SPRING WG List &lt;spring@ietf.org&gt;<br>
<b>Cc:</b> draft-ietf-spring-segment-routing-mpls@ietf.org<br>
<b>Betreff:</b> Re: [spring] WG Last Call for draft-ietf-spring-segment-rou=
ting-mpls-13<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">Hi all,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">A quick update on the stat=
us of this WGLC:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- All the authors have res=
ponded about IPR (thank you!). Still missing replies from some contributors=
 (Wim, Edward, Igor, Saku). I&#8217;ve sent them a reminder
 this Monday.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- Two people (Zafar, Adria=
n) have responded supporting publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- No opposition.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- Two persons have sent co=
mments (Adrian, myself). Thanks Adrian.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- Authors have not replied=
 to any comment so far.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">- The WGLC period was sche=
duled to end tomorrow.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">I wish we had more support=
, reviews, and authors&#8217; involvement to reply to reviews.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">The WGLC is extended by a =
week. Please review the document and send your comments to the list, no lat=
er than *<b>June 15</b>*<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">Thank you,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black">--Bruno<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></=
p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif;mso-fareast-language:FR">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,sans-serif;mso-fareast-language:FR">
</span><a href=3D"mailto:bruno.decraene@orange.com"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;mso-farea=
st-language:FR">bruno.decraene@orange.com</span></a><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;mso-farea=
st-language:FR">
 [</span><a href=3D"mailto:bruno.decraene@orange.com"><span lang=3D"EN-US" =
style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;mso-far=
east-language:FR">mailto:bruno.decraene@orange.com</span></a><span lang=3D"=
EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;=
mso-fareast-language:FR">]
<br>
<b>Sent:</b> Thursday, May 24, 2018 7:14 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Cc:</b> </span><a href=3D"mailto:draft-ietf-spring-segment-routing-mpls@=
ietf.org"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;=
Tahoma&quot;,sans-serif;mso-fareast-language:FR">draft-ietf-spring-segment-=
routing-mpls@ietf.org</span></a><span lang=3D"EN-US" style=3D"font-size:10.=
0pt;font-family:&quot;Tahoma&quot;,sans-serif;mso-fareast-language:FR"><br>
<b>Subject:</b> WG Last Call for draft-ietf-spring-segment-routing-mpls-13<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US">Hello Working Group,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and =
ready for a final working group review.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven't read the=
 most recent version yet, and send your comments to the list, no later than=
 *June 08*.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-resolution.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
.. Thank you Shraddha.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Thank you,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">[1] </span><a href=3D"https://tools.ietf.org/html=
/draft-ietf-spring-segment-routing-mpls-13"><span lang=3D"EN-US">https://to=
ols.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13</span></a><span=
 lang=3D"EN-US"><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">[2] </span><a href=3D"https://mailarchive.ietf.or=
g/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y"><span lang=3D"EN-US">https:/=
/mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</span></a=
><span lang=3D"EN-US"><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-family:&quot;Arial&quot;,sans-serif=
"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"EN-US">Orange decline toute responsabilite si ce message=
 a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">This message and its attachments may contain conf=
idential or privileged information that may be protected by law;<o:p></o:p>=
</span></pre>
<pre><span lang=3D"EN-US">they should not be distributed, used or copied wi=
thout authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">If you have received this email in error, please =
notify the sender and delete this message and its attachments.<o:p></o:p></=
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<pre><span lang=3D"EN-US">As emails may be altered, Orange is not liable fo=
r messages that have been modified, changed or falsified.<o:p></o:p></span>=
</pre>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"EN-US">Orange decline toute responsabilite si ce message=
 a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">This message and its attachments may contain conf=
idential or privileged information that may be protected by law;<o:p></o:p>=
</span></pre>
<pre><span lang=3D"EN-US">they should not be distributed, used or copied wi=
thout authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">If you have received this email in error, please =
notify the sender and delete this message and its attachments.<o:p></o:p></=
span></pre>
<pre><span lang=3D"EN-US">As emails may be altered, Orange is not liable fo=
r messages that have been modified, changed or falsified.<o:p></o:p></span>=
</pre>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
CC: SPRING WG List <spring@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Luay Jalil <luayjalil@gmail.com>
Date: Wed, 13 Jun 2018 08:39:26 -0500
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To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org, SPRING WG List <spring@ietf.org>,  "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,  "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/JPl1zhX6xTqT_NICgxvHd9E2Jo8>
Subject: Re: [spring] [mpls] draft-xu-mpls-sr-over-ip
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I am not aware of any IPR related to this draft

Regards
Luay

On Thu, Jun 7, 2018, 5:15 AM Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
> /Loa
>   mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000430564056e861d42
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"auto"><span style=3D"font-family:sans-serif;font-size:12.8px">I=
 am not aware of any IPR related to this draft</span><div dir=3D"auto"><spa=
n style=3D"font-family:sans-serif;font-size:12.8px"><br></span></div><div d=
ir=3D"auto"><span style=3D"font-family:sans-serif;font-size:12.8px">Regards=
=C2=A0</span></div><div dir=3D"auto"><span style=3D"font-family:sans-serif;=
font-size:12.8px">Luay</span></div></div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr">On Thu, Jun 7, 2018, 5:15 AM Loa Andersson &lt;<a href=3D"mai=
lto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">Working Group,<br>
<br>
We are currently preparing draft draft-xu-mpls-sr-over-ip for working<br>
group adoption.<br>
<br>
Part of this preparation is to do an IPR poll.<br>
<br>
This mail is to start the IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.<br=
>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS WG mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
We have copied this mail to the SPRING wg mailing list for information.<br>
If you receive this mail over the SPRING wg mailing list, and are aware<br>
of IPRs that apply to the draft, please notify the MPLS wg list.<br>
<br>
<br>
/Loa<br>
=C2=A0 mpls wg co-chair<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
 rel=3D"noreferrer">loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank" rel=3D"noreferrer">mpls@=
ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer no=
referrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><=
br>
</blockquote></div>

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
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Subject: [spring] Is TI-LFA compatible with the default SR algorithm?
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Hi all,
I have looked up Section 3.1.1 "Prefix-SID Algorithm" of the Segment Routi=
ng Architecture<https://tools.ietf.org/html/draft-ietf-spring-segment-rout=
ing-15> draft (already In the RFC Editor queue) and found there the follow=
ing statement (the relevant part is highlighted):

This document defines two algorithms:

   o  "Shortest Path": this algorithm is the default behavior.  The
      packet is forwarded along the well-known ECMP-aware SPF algorithm
      employed by the IGPs.  However it is explicitly allowed for a
      midpoint to implement another forwarding based on local policy.
      The "Shortest Path" algorithm is in fact the default and current
      behavior of most of the networks where local policies may override
      the SPF decision.

   o  "Strict Shortest Path (Strict-SPF)": This algorithm mandates that
      the packet is forwarded according to ECMP-aware SPF algorithm and
      instructs any router in the path to ignore any possible local
      policy overriding the SPF decision.  The SID advertised with
      Strict-SPF algorithm ensures that the path the packet is going to
      take is the expected, and not altered, SPF path.  Note that Fast
      Reroute (FRR) [RFC5714<https://tools.ietf.org/html/rfc5714>] mechani=
sms are still compliant with the
      Strict Shortest Path.  In other words, a packet received with a
      Strict-SPF SID may be rerouted through a FRR mechanism.

At the same time, the TI-LFA draft<https://tools.ietf.org/html/draft-basha=
ndy-rtgwg-segment-routing-ti-lfa-04> discusses protection of active Prefix=
-SIDs (e.g., in Section 3 that discusses P-Space and Q-space) but, to the =
best of my understanding, does not mention algorithms that form the contex=
t of these SIDs.

My question to the authors of the TI-LFA draft is:

Are the mechanisms defined in the draft (and examples discussed in Section=
 4) applicable to Prefix-SIDs associated with the default forwarding algor=
ithm as defined in the Segment Routing Architecture draft?

I strongly suspect that it is not so, and that these mechanisms are only c=
ompatible with the Strict-SPF. (Actually, I can provide an example that co=
nfirms this suspicion.)

Do I miss something substantial here?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have looked up Section 3.1.1 &#8220;<b>Prefix-SID=
 Algorithm</b>&#8221; of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">Segment Routing Architecture</a> draft (already In the RFC Editor queue=
) and found there the following statement (the relevant part is
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>)=
:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">This document defines two algorithms:<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Shortest Path&quo=
t;: this algorithm is the default behavior.&nbsp; The<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; packet is for=
warded along the well-known ECMP-aware SPF algorithm<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; employed by t=
he IGPs.&nbsp; However it is explicitly allowed for a<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; midpoint to i=
mplement another forwarding based on local policy.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The &quot;Sho=
rtest Path&quot; algorithm is in fact the default and current<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; behavior of m=
ost of the networks where local policies may override<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the SPF decis=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Strict Shortest P=
ath (Strict-SPF)&quot;: This algorithm mandates that<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the packet is=
 forwarded according to ECMP-aware SPF algorithm and<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instructs any=
 router in the path to ignore any possible local<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; policy overri=
ding the SPF decision.&nbsp; The SID advertised with<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Strict-SPF al=
gorithm ensures that the path the packet is going to<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; take is the e=
xpected, and not altered, SPF path.&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">Note that Fast<o:p>=
</o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Reroute (FRR) [<a href=3D"https://tools.ietf.org=
/html/rfc5714" title=3D"&quot;IP Fast Reroute Framework&quot;"><span style=
=3D"color:blue">RFC5714</span></a>]
 mechanisms are still compliant with the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Strict Shortest Path.&nbsp; In other words, a pa=
cket received with a<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;=20Strict-SPF SID may be rerouted through a FRR m=
echanism</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier N=
ew&quot;;color:black">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the <a href=3D"https://tools.ietf=
.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04">
TI-LFA draft</a> discusses protection of active Prefix-SIDs (e.g., in Sect=
ion 3 that discusses P-Space and Q-space) but, to the best of my understan=
ding, does not mention algorithms that form the context of these SIDs.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">My question to the authors of the TI-LFA draft is: =
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Are the mechanisms defined in the draft (and exampl=
es discussed in Section 4) applicable to Prefix-SIDs associated with the d=
efault forwarding algorithm as defined in the Segment Routing Architecture=
 draft?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I strongly suspect that it is not so, and that thes=
e mechanisms are only compatible with the Strict-SPF. (Actually, I can pro=
vide an example that confirms this suspicion.)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Do I miss something substantial here? <o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
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Subject: [spring] I-D Action: draft-ietf-spring-segment-routing-ldp-interop-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : Segment Routing interworking with LDP
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Stefano Previdi
                          Bruno Decraene
                          Stephane Litkowski
	Filename        : draft-ietf-spring-segment-routing-ldp-interop-13.txt
	Pages           : 23
	Date            : 2018-06-13

Abstract:
   A Segment Routing (SR) node steers a packet through a controlled set
   of instructions, called segments, by prepending the packet with an SR
   header.  A segment can represent any instruction, topological or
   service-based.  SR allows to enforce a flow through any topological
   path while maintaining per-flow state only at the ingress node to the
   SR domain.

   The Segment Routing architecture can be directly applied to the MPLS
   data plane with no change in the forwarding plane.  This document
   describes how Segment Routing operates in a network where LDP is
   deployed and in the case where SR-capable and non-SR-capable nodes
   coexist.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-ldp-interop-13
https://datatracker.ietf.org/doc/html/draft-ietf-spring-segment-routing-ldp-interop-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-segment-routing-ldp-interop-13


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
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To: Tomonori Takeda <tomonori.takeda@ntt.com>, "'rtg-ads@ietf.org'" <rtg-ads@ietf.org>
Cc: "'spring@ietf.org'" <spring@ietf.org>, "'rtg-dir@ietf.org'" <rtg-dir@ietf.org>, "'draft-ietf-spring-segment-routing-ldp-interop.all@ietf.org'" <draft-ietf-spring-segment-routing-ldp-interop.all@ietf.org>
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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
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Subject: Re: [spring] RtgDir review: draft-ietf-spring-segment-routing-ldp-interop-11
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Hi

I just published version 13
https://www.ietf.org/internet-drafts/draft-ietf-spring-segment-routing-ldp-interop-13.txt

I moved the section about migration to appendix

Thanks

Ahmed



On 5/26/18 8:47 AM, Tomonori Takeda wrote:
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see â€‹http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
> Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft.
>
>   Document: draft-ietf-spring-segment-routing-ldp-interop-11
>   Reviewer: Tomonori Takeda
>   Review Date: May 26th, 2018
>   IETF LC End Date: Not known
>   Intended Status: Standards Track
>
> Summary:
> This document is basically ready for publication, but has nits that should be considered prior to publication.
>
> Major Issues:
> None
>
> Minor Issues:
> I am a little bit confused about the relationship of SR/LDP interworking and migration from LDP to SR.
>
> The document says:
>   
>     "This document outlines the mechanisms through which SR interworks
>     with LDP in cases where a mix of SR-capable and non-SR-capable
>     routers co- exist within the same network and more precisely in the
>     same routing domain."
>
> My understanding of SR/LDP interworking and migration from LDP to SR is a different story.
> Migration from LDP to SR may or may not use SR/LDP interworking.
>
> Section 3 described migration from LDP to SR, but this migration scenario does not use
> SR/LDP interworking (expect for SR-based FRR usage to protect LDP traffic).
> This migration scenario uses SR/LDP co-existence, though.
>
> Is section 3 for information purpose only?
>
> Nits:
> None
>
>
> Thanks,
> Tomonori Takeda
>


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From: "Zafar Ali (zali)" <zali@cisco.com>
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CC: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>, "Zafar Ali (zali)" <zali@cisco.com>
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Gunter -

I strongly support Option #2 and strongly support Ketan's recommendation th=
at an MSD sub-type be used to advertise ERLD.
This is the unified framework that the MSD advertisement has been designed =
to support.

The following documents provide a unified definition of this mechanism:

https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/

(The last one needs a refresh.)

If we can update the related ERLD documents to align I think we will have a=
n excellent solution.

 (Note: in the case of https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-=
ls-segment-routing-rld/ perhaps that can be combined with https://datatrack=
er.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/  - but I leave t=
hat to the respective authors to work out.)

   Les



> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia
> - BE/Antwerp)
> Sent: Wednesday, June 13, 2018 2:10 AM
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.=
org;
> spring@ietf.org
> Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) ar=
e
> signaled for ISIS, OSPF and BGP-LS.
>=20
> If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
> next, have a look into how to encode the TLV so that we have a clean
> technological solution space.
>=20
> G/
>=20
> -----Original Message-----
> From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> Sent: Wednesday, June 13, 2018 10:45
> To: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Hi Gunter,
>=20
> In that case, I concur with you that option (2) is better than the others=
. My
> only difference in opinion is that ERLD not have its own separate TLV but
> instead get advertised as a new MSD sub-type - it is just a different enc=
oding.
>=20
> Thanks,
> Ketan
>=20
> -----Original Message-----
> From: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>
> Sent: 13 June 2018 13:55
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.=
org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Indeed, the debate that made BGP-LS to go down the ERLD path is of
> pragmatic motivation.
>=20
> The major Readable Label Depth use-case is entropy. Hence, if the ERLD TL=
V
> is available, then ELC can be implicitly assumed. No pragmatic reason to =
signal
> separately, as it just make things more complex then should be.
>=20
> >From a holistic perspective having something similar, yet different, in =
both
> IGP and BGP-LS encoding seems to make little sense and only bring
> confusion (router/controller implementers and network operators).
>=20
> The ways to address this in IGP and BGP-LS going forward:
> 1) do nothing and leave all as it is (it has potential to create massive
> confusion)
> 2) only signal ERLD TLV in IGP and BGP
> 3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signal=
ing of
> ELC TLV compared to option (2))
> 4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much mor=
e
> complex as option (2))
>=20
> I believe that option (2) is the best option:
> * it bring the needed readable label depth value to operators
> * most simple solution for implementers (routers and controller)
> * easy to understand with no confusion
> * is compliant with draft-ietf-mpls-spring-entropy-label-10
>=20
> G/
>=20
> -----Original Message-----
> From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> Sent: Wednesday, June 13, 2018 08:05
> To: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Hi Gunter,
>=20
> The difference in IGP signalling seems to be because the ELC is a capabil=
ity
> which is advertised differently than ERLD which is a limit. Are you sayin=
g that
> ELC does not have value by itself without the ERLD?
>=20
> IMHO it makes sense to retain ELC as capability of the router (as specifi=
ed in
> the IGP specs) and position ERLD as a MSD sub-type for indicating the lim=
it.
> This way we have the flexibility of signalling ERLD both per node and per
> ingress link/LC level.
>=20
> Thanks,
> Ketan
>=20
> -----Original Message-----
> From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia
> - BE/Antwerp)
> Sent: 12 June 2018 19:28
> To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
> Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> In LSR WG the following drafts document the signaling of ELC and RLD:
> * draft-ietf-ospf-mpls-elc
> * draft-ietf-isis-mpls-elc
>=20
> When exporting this information using BGP-LS encoding to a controller, th=
ere
> is need for BGP-LS extension by means of new TLVs.
>=20
> BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF=
 is
> signaling individually ELC and RLD
>=20
> I was working upon the IANA section, and discovered some inconsistency
> that should be addressed:
> * Why is IGP signaling individual ELC and RLD? ERLD is what was decided u=
pon
> (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
> * What are the plans to request IANA code points for these drafts?
> * (E)RLD seems to have meaning only from NODE perspective, (I assume that
> LINK ERLD is not of any value at all, is that a correct assumption?)
>=20
> G/
>=20
>=20
> -----Original Message-----
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Tuesday, June 12, 2018 15:25
> To: i-d-announce@ietf.org
> Cc: idr@ietf.org
> Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.t=
xt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Inter-Domain Routing WG of the IETF.
>=20
>         Title           : Signalling ERLD using BGP-LS
>         Authors         : Gunter Van de Velde
>                           Wim Henderickx
>                           Matthew Bocci
>                           Keyur Patel
> 	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
> 	Pages           : 6
> 	Date            : 2018-06-12
>=20
> Abstract:
>    This document defines the attribute encoding to use for BGP-LS to
>    expose ERLD "Entropy capable Readable Label Depth" from a node to a
>    centralised controller (PCE/SDN).
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rl=
d/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routi=
ng-
> rld-02
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing=
-rld-
> 02
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


From nobody Wed Jun 13 08:56:10 2018
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'SPRING WG List'" <spring@ietf.org>
Cc: <draft-farrel-spring-sr-domain-interconnect@ietf.org>
References: <152890354146.14347.14551190548002024550@ietfa.amsl.com>
In-Reply-To: <152890354146.14347.14551190548002024550@ietfa.amsl.com>
Date: Wed, 13 Jun 2018 16:55:48 +0100
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Subject: [spring] FW: I-D Action: draft-farrel-spring-sr-domain-interconnect-04.txt
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Some of you may recall discussing this in SPRING a few meetings ago.

It is an overview of how a number of networking building blocks fit together to
provide interconnection of SR domains.

There is no new technology defined in the document: just a high-level view of
how mechanisms defined in other documents may be combined. Hence, it is an
informational document.

Something we need to add, I think is a description of how SR-MPLS-over-UDP (per
draft-xu-mpls-sr-over-ip) fits in.

We would (of course) welcome thoughts on:
- what is not clear
- what we have missed
- what is OTT to include

Probably we would also like to hear whether there is any value in this document.

Thanks,
Adrian

> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: 13 June 2018 16:26
> To: i-d-announce@ietf.org
> Subject: I-D Action: draft-farrel-spring-sr-domain-interconnect-04.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> 
> 
>         Title           : Interconnection of Segment Routing Domains - Problem
> Statement and Solution Landscape
>         Authors         : Adrian Farrel
>                           John Drake
> 	Filename        : draft-farrel-spring-sr-domain-interconnect-04.txt
> 	Pages           : 35
> 	Date            : 2018-06-13
> 
> Abstract:
>    Segment Routing (SR) is a forwarding paradigm for use in MPLS and
>    IPv6 networks.  It is intended to be deployed in discrete domains
>    that may be data centers, access networks, or other networks that are
>    under the control of a single operator and that can easily be
>    upgraded to support this new technology.
> 
>    Traffic originating in one SR domain often terminates in another SR
>    domain, but must transit a backbone network that provides
>    interconnection between those domains.
> 
>    This document describes a mechanism for providing connectivity
>    between SR domains to enable end-to-end or domain-to-domain traffic
>    engineering.
> 
>    The approach described allows connectivity between SR domains,
>    utilizes traffic engineering mechanisms (RSVP-TE or Segment Routing)
>    across the backbone network, makes heavy use of pre-existing
>    technologies, and requires the specification of very few additional
>    mechanisms.
> 
>    This document provides some background and a problem statement,
>    explains the solution mechanism, gives references to other documents
>    that define protocol mechanisms, and provides examples.  It does not
>    define any new protocol mechanisms.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-farrel-spring-sr-domain-interconnect/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-farrel-spring-sr-domain-interconnect-04
> https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-
> interconnect-04
> 
> A diff from the previous version is available at:
>
https://www.ietf.org/rfcdiff?url2=draft-farrel-spring-sr-domain-interconnect-04
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
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> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


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From: John E Drake <jdrake@juniper.net>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/8YIS01Efxt5LDfYL_8IxKE1o5kg>
Subject: Re: [spring] [mpls] draft-xu-mpls-sr-over-ip
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I'm not aware of any IPR.

Yours Irrespectively,

John


> -----Original Message-----
> From: mpls <mpls-bounces@ietf.org> On Behalf Of Loa Andersson
> Sent: Thursday, June 7, 2018 6:15 AM
> To: mpls@ietf.org
> Cc: spring@ietf.org; mpls-chairs@ietf.org; draft-xu-mpls-sr-over-ip@ietf.=
org
> Subject: [mpls] draft-xu-mpls-sr-over-ip
>=20
> Working Group,
>=20
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working gro=
up
> adoption.
>=20
> Part of this preparation is to do an IPR poll.
>=20
> This mail is to start the IPR poll.
>=20
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>=20
> If so, has this IPR been disclosed in compliance with IETF IPR rules (see=
 RFCs
> 3979, 4879, 3669 and 5378 for more details).
>=20
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>=20
> If you are listed as a document author or contributor please respond to t=
his
> email regardless of whether or not you are aware of any relevant IPR. *Th=
e
> response needs to be sent to the MPLS WG mailing list.* The document will
> not advance to the next stage until a response has been received from eac=
h
> author and contributor.
>=20
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any =
IPR
> that has not yet been disclosed in conformance with IETF rules.
>=20
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware o=
f
> IPRs that apply to the draft, please notify the MPLS wg list.
>=20
>=20
> /Loa
>   mpls wg co-chair
> --
>=20
>=20
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-
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Date: Wed, 13 Jun 2018 14:09:22 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Message-ID: <18BFE8FF-4DEA-43A2-9262-8649D1A1692D@gmail.com>
Thread-Topic: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/UPtdG2_pKZav-1KWp7Iod-jnzOE>
Subject: Re: [spring] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Gunter,

I have nothing to add to Les' comments, 100% agree.

Cheers,
Jeff
=EF=BB=BFOn 6/13/18, 08:42, "Idr on behalf of Les Ginsberg (ginsberg)" <idr-bounc=
es@ietf.org on behalf of ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:

    Gunter -
   =20
    I strongly support Option #2 and strongly support Ketan's recommendatio=
n that an MSD sub-type be used to advertise ERLD.
    This is the unified framework that the MSD advertisement has been desig=
ned to support.
   =20
    The following documents provide a unified definition of this mechanism:
   =20
    https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
    https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/
    https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-=
msd/
   =20
    (The last one needs a refresh.)
   =20
    If we can update the related ERLD documents to align I think we will ha=
ve an excellent solution.
   =20
     (Note: in the case of https://datatracker.ietf.org/doc/draft-ietf-idr-=
bgp-ls-segment-routing-rld/ perhaps that can be combined with https://datatr=
acker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/  - but I leave=
 that to the respective authors to work out.)
   =20
       Les
   =20
   =20
   =20
    > -----Original Message-----
    > From: Lsr <lsr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (N=
okia
    > - BE/Antwerp)
    > Sent: Wednesday, June 13, 2018 2:10 AM
    > To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@i=
etf.org;
    > spring@ietf.org
    > Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]=
) are
    > signaled for ISIS, OSPF and BGP-LS.
    >=20
    > If the WG's can manage to agree upon a decision (option1/2/3 or 4), t=
hen
    > next, have a look into how to encode the TLV so that we have a clean
    > technological solution space.
    >=20
    > G/
    >=20
    > -----Original Message-----
    > From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
    > Sent: Wednesday, June 13, 2018 10:45
    > To: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Hi Gunter,
    >=20
    > In that case, I concur with you that option (2) is better than the ot=
hers. My
    > only difference in opinion is that ERLD not have its own separate TLV=
 but
    > instead get advertised as a new MSD sub-type - it is just a different=
 encoding.
    >=20
    > Thanks,
    > Ketan
    >=20
    > -----Original Message-----
    > From: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>
    > Sent: 13 June 2018 13:55
    > To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@i=
etf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Indeed, the debate that made BGP-LS to go down the ERLD path is of
    > pragmatic motivation.
    >=20
    > The major Readable Label Depth use-case is entropy. Hence, if the ERL=
D TLV
    > is available, then ELC can be implicitly assumed. No pragmatic reason=
 to signal
    > separately, as it just make things more complex then should be.
    >=20
    > >From a holistic perspective having something similar, yet different,=
 in both
    > IGP and BGP-LS encoding seems to make little sense and only bring
    > confusion (router/controller implementers and network operators).
    >=20
    > The ways to address this in IGP and BGP-LS going forward:
    > 1) do nothing and leave all as it is (it has potential to create mass=
ive
    > confusion)
    > 2) only signal ERLD TLV in IGP and BGP
    > 3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit si=
gnaling of
    > ELC TLV compared to option (2))
    > 4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much=
 more
    > complex as option (2))
    >=20
    > I believe that option (2) is the best option:
    > * it bring the needed readable label depth value to operators
    > * most simple solution for implementers (routers and controller)
    > * easy to understand with no confusion
    > * is compliant with draft-ietf-mpls-spring-entropy-label-10
    >=20
    > G/
    >=20
    > -----Original Message-----
    > From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
    > Sent: Wednesday, June 13, 2018 08:05
    > To: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Hi Gunter,
    >=20
    > The difference in IGP signalling seems to be because the ELC is a cap=
ability
    > which is advertised differently than ERLD which is a limit. Are you s=
aying that
    > ELC does not have value by itself without the ERLD?
    >=20
    > IMHO it makes sense to retain ELC as capability of the router (as spe=
cified in
    > the IGP specs) and position ERLD as a MSD sub-type for indicating the=
 limit.
    > This way we have the flexibility of signalling ERLD both per node and=
 per
    > ingress link/LC level.
    >=20
    > Thanks,
    > Ketan
    >=20
    > -----Original Message-----
    > From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (N=
okia
    > - BE/Antwerp)
    > Sent: 12 June 2018 19:28
    > To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
    > Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > In LSR WG the following drafts document the signaling of ELC and RLD:
    > * draft-ietf-ospf-mpls-elc
    > * draft-ietf-isis-mpls-elc
    >=20
    > When exporting this information using BGP-LS encoding to a controller=
, there
    > is need for BGP-LS extension by means of new TLVs.
    >=20
    > BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/=
OSPF is
    > signaling individually ELC and RLD
    >=20
    > I was working upon the IANA section, and discovered some inconsistenc=
y
    > that should be addressed:
    > * Why is IGP signaling individual ELC and RLD? ERLD is what was decid=
ed upon
    > (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
    > * What are the plans to request IANA code points for these drafts?
    > * (E)RLD seems to have meaning only from NODE perspective, (I assume =
that
    > LINK ERLD is not of any value at all, is that a correct assumption?)
    >=20
    > G/
    >=20
    >=20
    > -----Original Message-----
    > From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-
    > drafts@ietf.org
    > Sent: Tuesday, June 12, 2018 15:25
    > To: i-d-announce@ietf.org
    > Cc: idr@ietf.org
    > Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-=
02.txt
    >=20
    >=20
    > A New Internet-Draft is available from the on-line Internet-Drafts di=
rectories.
    > This draft is a work item of the Inter-Domain Routing WG of the IETF.
    >=20
    >         Title           : Signalling ERLD using BGP-LS
    >         Authors         : Gunter Van de Velde
    >                           Wim Henderickx
    >                           Matthew Bocci
    >                           Keyur Patel
    > 	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
    > 	Pages           : 6
    > 	Date            : 2018-06-12
    >=20
    > Abstract:
    >    This document defines the attribute encoding to use for BGP-LS to
    >    expose ERLD "Entropy capable Readable Label Depth" from a node to =
a
    >    centralised controller (PCE/SDN).
    >=20
    >=20
    >=20
    > The IETF datatracker status page for this draft is:
    > https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routin=
g-rld/
    >=20
    > There are also htmlized versions available at:
    > https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld=
-02
    > https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-r=
outing-
    > rld-02
    >=20
    > A diff from the previous version is available at:
    > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routi=
ng-rld-
    > 02
    >=20
    >=20
    > Please note that it may take a couple of minutes from the time of sub=
mission
    > until the htmlized version and diff are available at tools.ietf.org.
    >=20
    > Internet-Drafts are also available by anonymous FTP at:
    > ftp://ftp.ietf.org/internet-drafts/
    >=20
    > _______________________________________________
    > Idr mailing list
    > Idr@ietf.org
    > https://www.ietf.org/mailman/listinfo/idr
    >=20
    > _______________________________________________
    > Idr mailing list
    > Idr@ietf.org
    > https://www.ietf.org/mailman/listinfo/idr
    >=20
    > _______________________________________________
    > Lsr mailing list
    > Lsr@ietf.org
    > https://www.ietf.org/mailman/listinfo/lsr
   =20
    _______________________________________________
    Idr mailing list
    Idr@ietf.org
    https://www.ietf.org/mailman/listinfo/idr
   =20



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From: <stephane.litkowski@orange.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
Thread-Index: AdQCVS4zJNJrYGL7RvyJWFnJWJ9mLgAhqsxQAAPpAwAAAcpz8AAATSsgABuZfdA=
Date: Wed, 13 Jun 2018 22:05:03 +0000
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References: <AM5PR0701MB17290B271DD58F23E0E3EA86E07F0@AM5PR0701MB1729.eurprd07.prod.outlook.com> <741c5584debc4bc7821292de52f8d6c4@XCH-ALN-008.cisco.com> <AM5PR0701MB172929505908F164E3DCA377E07E0@AM5PR0701MB1729.eurprd07.prod.outlook.com> <5c494d4e76cf4fa1adcb695f4ee4b59e@XCH-ALN-008.cisco.com> <AM5PR0701MB1729C0A2324D84DBB71AA269E07E0@AM5PR0701MB1729.eurprd07.prod.outlook.com>
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Subject: Re: [spring] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD mea=
ns that the node is defacto ELC (so advertising ELC separately is not neces=
sary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (=
Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are =
signaled for ISIS, OSPF and BGP-LS.=20

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then ne=
xt, have a look into how to encode the TLV so that we have a clean technolo=
gical solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bo=
th IGP and BGP-LS encoding seems to make little sense and only bring confus=
ion (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
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https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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https://www.ietf.org/mailman/listinfo/lsr

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From: <stephane.litkowski@orange.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
CC: Stewart Bryant <stewart.bryant@gmail.com>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Thread-Topic: Is TI-LFA compatible with the default SR algorithm?
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Date: Thu, 14 Jun 2018 10:56:30 +0000
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Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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Hi Sasha,

Could you elaborate on :" I strongly suspect that it is not so, and that th=
ese mechanisms are only compatible with the Strict-SPF. (Actually, I can pr=
ovide an example that confirms this suspicion.)" ?

Thanks,


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Alexander Vainsh=
tein
Sent: Wednesday, June 13, 2018 17:00
To: draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org
Cc: Stewart Bryant; Michael Gorokhovsky; draft-ietf-spring-segment-routing.=
authors@ietf.org; spring@ietf.org; rtgwg@ietf.org
Subject: [spring] Is TI-LFA compatible with the default SR algorithm?

Hi all,
I have looked up Section 3.1.1 "Prefix-SID Algorithm" of the Segment Routin=
g Architecture<https://tools.ietf.org/html/draft-ietf-spring-segment-routin=
g-15> draft (already In the RFC Editor queue) and found there the following=
 statement (the relevant part is highlighted):

This document defines two algorithms:

   o  "Shortest Path": this algorithm is the default behavior.  The
      packet is forwarded along the well-known ECMP-aware SPF algorithm
      employed by the IGPs.  However it is explicitly allowed for a
      midpoint to implement another forwarding based on local policy.
      The "Shortest Path" algorithm is in fact the default and current
      behavior of most of the networks where local policies may override
      the SPF decision.

   o  "Strict Shortest Path (Strict-SPF)": This algorithm mandates that
      the packet is forwarded according to ECMP-aware SPF algorithm and
      instructs any router in the path to ignore any possible local
      policy overriding the SPF decision.  The SID advertised with
      Strict-SPF algorithm ensures that the path the packet is going to
      take is the expected, and not altered, SPF path.  Note that Fast
      Reroute (FRR) [RFC5714<https://tools.ietf.org/html/rfc5714>] mechanis=
ms are still compliant with the
      Strict Shortest Path.  In other words, a packet received with a
      Strict-SPF SID may be rerouted through a FRR mechanism.

At the same time, the TI-LFA draft<https://tools.ietf..org/html/draft-basha=
ndy-rtgwg-segment-routing-ti-lfa-04> discusses protection of active Prefix-=
SIDs (e.g., in Section 3 that discusses P-Space and Q-space) but, to the be=
st of my understanding, does not mention algorithms that form the context o=
f these SIDs.

My question to the authors of the TI-LFA draft is:

Are the mechanisms defined in the draft (and examples discussed in Section =
4) applicable to Prefix-SIDs associated with the default forwarding algorit=
hm as defined in the Segment Routing Architecture draft?

I strongly suspect that it is not so, and that these mechanisms are only co=
mpatible with the Strict-SPF. (Actually, I can provide an example that conf=
irms this suspicion.)

Do I miss something substantial here?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Could you elaborate on=
 :&#8221;</span> I strongly suspect that it is not so, and that these mecha=
nisms are only compatible with the Strict-SPF. (Actually, I can provide an =
example that confirms this suspicion.)&#8221; ?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> spring [=
mailto:spring-bounces@ietf.org]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> Wednesday, June 13, 2018 17:00<br>
<b>To:</b> draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org<br>
<b>Cc:</b> Stewart Bryant; Michael Gorokhovsky; draft-ietf-spring-segment-r=
outing.authors@ietf.org; spring@ietf.org; rtgwg@ietf.org<br>
<b>Subject:</b> [spring] Is TI-LFA compatible with the default SR algorithm=
?<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have looked up Section 3.1.1 &#8220;<b>Prefix-SID =
Algorithm</b>&#8221; of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15=
">Segment Routing Architecture</a> draft (already In the RFC Editor queue) =
and found there the following statement (the relevant part is
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>):=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">This document defines two algorithms:<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Shortest Path&quot;=
: this algorithm is the default behavior.&nbsp; The<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; packet is forwa=
rded along the well-known ECMP-aware SPF algorithm<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; employed by the=
 IGPs.&nbsp; However it is explicitly allowed for a<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; midpoint to imp=
lement another forwarding based on local policy.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The &quot;Short=
est Path&quot; algorithm is in fact the default and current<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; behavior of mos=
t of the networks where local policies may override<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the SPF decisio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Strict Shortest Pat=
h (Strict-SPF)&quot;: This algorithm mandates that<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the packet is f=
orwarded according to ECMP-aware SPF algorithm and<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instructs any r=
outer in the path to ignore any possible local<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; policy overridi=
ng the SPF decision.&nbsp; The SID advertised with<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Strict-SPF algo=
rithm ensures that the path the packet is going to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; take is the exp=
ected, and not altered, SPF path.&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">Note that Fast<o:p><=
/o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; Reroute (FRR) [<a href=3D"https://tools.ietf.org/ht=
ml/rfc5714" title=3D"&quot;IP Fast Reroute Framework&quot;"><span style=3D"=
color:blue">RFC5714</span></a>]
 mechanisms are still compliant with the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; Strict Shortest Path.&nbsp; In other words, a packe=
t received with a<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; Strict-SPF SID may be rerouted through a FRR mechan=
ism</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quo=
t;;color:black">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the <a href=3D"https://tools.ietf.=
.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04">
TI-LFA draft</a> discusses protection of active Prefix-SIDs (e.g., in Secti=
on 3 that discusses P-Space and Q-space) but, to the best of my understandi=
ng, does not mention algorithms that form the context of these SIDs.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">My question to the authors of the TI-LFA draft is: <=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Are the mechanisms defined in the draft (and example=
s discussed in Section 4) applicable to Prefix-SIDs associated with the def=
ault forwarding algorithm as defined in the Segment Routing Architecture dr=
aft?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I strongly suspect that it is not so, and that these=
 mechanisms are only compatible with the Strict-SPF. (Actually, I can provi=
de an example that confirms this suspicion.)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Do I miss something substantial here? <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><br>
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From: "Zafar Ali (zali)" <zali@cisco.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
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To: stephane.litkowski@orange.com, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
References: <DB5PR0301MB1909F44C6E7D9311B0FDA0C99D7E0@DB5PR0301MB1909.eurprd03.prod.outlook.com> <1113_1528973791_5B2249DF_1113_378_1_9E32478DFA9976438E7A22F69B08FF924B1C4116@OPEXCLILMA4.corporate.adroot.infra.ftgroup>
From: Stewart Bryant <stewart.bryant@gmail.com>
Message-ID: <02d22e1d-0f94-2c42-cb4d-62db0af9996f@gmail.com>
Date: Thu, 14 Jun 2018 13:31:19 +0100
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Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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RFC5714 was written when we were focused on routing in base along normal 
Dijkstra shortest paths.

As policy and flexible algorithms become prevalent we need to specify 
that any RFC5714 action is compliant to the policies and intended 
algorithms along the entirety of its path.

We need to think this through carefully, but that may mean that in a 
network where any of these enhanced routing methods are deployed, ALL 
routers doing FRR need to validate the safety of the packet path. There 
may be more computationally efficient ways to do this, but worse case 
looks like needing to precompute the full path to all destinations 
reachable via the failure including applying the policy and algorithms 
installed on all of those routers. What I am unclear of is how we find 
that policy to do that.

Maybe I am being overly pessimistic here, but Sasha makes an interesting 
observation that we need to think through very carefully.

- Stewart


On 14/06/2018 11:56, stephane.litkowski@orange.com wrote:
>
> Hi Sasha,
>
> Could you elaborate on :” I strongly suspect that it is not so, and 
> that these mechanisms are only compatible with the Strict-SPF. 
> (Actually, I can provide an example that confirms this suspicion.)” ?
>
> Thanks,
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of 
> *Alexander Vainshtein
> *Sent:* Wednesday, June 13, 2018 17:00
> *To:* draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org
> *Cc:* Stewart Bryant; Michael Gorokhovsky; 
> draft-ietf-spring-segment-routing.authors@ietf.org; spring@ietf.org; 
> rtgwg@ietf.org
> *Subject:* [spring] Is TI-LFA compatible with the default SR algorithm?
>
> Hi all,
>
> I have looked up Section 3.1.1 “*Prefix-SID Algorithm*” of the Segment 
> Routing Architecture 
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> 
> draft (already In the RFC Editor queue) and found there the following 
> statement (the relevant part is highlighted):
>
> This document defines two algorithms:
>
>    o  "Shortest Path": this algorithm is the default behavior.  The
>
>       packet is forwarded along the well-known ECMP-aware SPF algorithm
>
>       employed by the IGPs.  However it is explicitly allowed for a
>
>       midpoint to implement another forwarding based on local policy.
>
>       The "Shortest Path" algorithm is in fact the default and current
>
>       behavior of most of the networks where local policies may override
>
>       the SPF decision.
>
>    o  "Strict Shortest Path (Strict-SPF)": This algorithm mandates that
>
>       the packet is forwarded according to ECMP-aware SPF algorithm and
>
>       instructs any router in the path to ignore any possible local
>
>       policy overriding the SPF decision.  The SID advertised with
>
>       Strict-SPF algorithm ensures that the path the packet is going to
>
>       take is the expected, and not altered, SPF path. Note that Fast
>
> Reroute (FRR) [RFC5714 <https://tools.ietf.org/html/rfc5714>] 
> mechanisms are still compliant with the
>
> Strict Shortest Path.  In other words, a packet received with a
>
> Strict-SPF SID may be rerouted through a FRR mechanism.
>
> At the same time, the TI-LFA draft 
> <https://tools.ietf..org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04> 
> discusses protection of active Prefix-SIDs (e.g., in Section 3 that 
> discusses P-Space and Q-space) but, to the best of my understanding, 
> does not mention algorithms that form the context of these SIDs.
>
> My question to the authors of the TI-LFA draft is:
>
> Are the mechanisms defined in the draft (and examples discussed in 
> Section 4) applicable to Prefix-SIDs associated with the default 
> forwarding algorithm as defined in the Segment Routing Architecture draft?
>
> I strongly suspect that it is not so, and that these mechanisms are 
> only compatible with the Strict-SPF. (Actually, I can provide an 
> example that confirms this suspicion.)
>
> Do I miss something substantial here?
>
> Regards, and lots of thanks in advance,
>
> Sasha
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
> ___________________________________________________________________________
>
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    <p>RFC5714 was written when we were focused on routing in base along
      normal Dijkstra shortest paths.</p>
    <p>As policy and flexible algorithms become prevalent we need to
      specify that any RFC5714 action is compliant to the policies and
      intended algorithms along the entirety of its path. <br>
    </p>
    <p>We need to think this through carefully, but that may mean that
      in a network where any of these enhanced routing methods are
      deployed, ALL routers doing FRR need to validate the safety of the
      packet path. There may be more computationally efficient ways to
      do this, but worse case looks like needing to precompute the full
      path to all destinations reachable via the failure including
      applying the policy and algorithms installed on all of those
      routers. What I am unclear of is how we find that policy to do
      that.<br>
    </p>
    <p>Maybe I am being overly pessimistic here, but Sasha makes an
      interesting observation that we need to think through very
      carefully.</p>
    <p>- Stewart<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 14/06/2018 11:56,
      <a class="moz-txt-link-abbreviated" href="mailto:stephane.litkowski@orange.com">stephane.litkowski@orange.com</a> wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:1113_1528973791_5B2249DF_1113_378_1_9E32478DFA9976438E7A22F69B08FF924B1C4116@OPEXCLILMA4.corporate.adroot.infra.ftgroup">
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      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:#1F497D">Hi Sasha,<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:#1F497D">Could you
            elaborate on :”</span> I strongly suspect that it is not so,
          and that these mechanisms are only compatible with the
          Strict-SPF. (Actually, I can provide an example that confirms
          this suspicion.)” ?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Thanks,<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">
                spring [<a class="moz-txt-link-freetext" href="mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
                <b>On Behalf Of </b>Alexander Vainshtein<br>
                <b>Sent:</b> Wednesday, June 13, 2018 17:00<br>
                <b>To:</b>
                <a class="moz-txt-link-abbreviated" href="mailto:draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org">draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org</a><br>
                <b>Cc:</b> Stewart Bryant; Michael Gorokhovsky;
                <a class="moz-txt-link-abbreviated" href="mailto:draft-ietf-spring-segment-routing.authors@ietf.org">draft-ietf-spring-segment-routing.authors@ietf.org</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:spring@ietf.org">spring@ietf.org</a>; <a class="moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><br>
                <b>Subject:</b> [spring] Is TI-LFA compatible with the
                default SR algorithm?<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Hi all,<o:p></o:p></p>
        <p class="MsoNormal">I have looked up Section 3.1.1 “<b>Prefix-SID
            Algorithm</b>” of the
          <a
            href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15"
            moz-do-not-send="true">Segment Routing Architecture</a>
          draft (already In the RFC Editor queue) and found there the
          following statement (the relevant part is
          <span style="background:yellow;mso-highlight:yellow">highlighted</span>):<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">This document defines two algorithms:<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">   o  "Shortest Path": this algorithm
            is the default behavior.  The<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      packet is forwarded along the
            well-known ECMP-aware SPF algorithm<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      employed by the IGPs.  However
            it is explicitly allowed for a<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      midpoint to implement another
            forwarding based on local policy.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      The "Shortest Path" algorithm
            is in fact the default and current<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      behavior of most of the
            networks where local policies may override<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      the SPF decision.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">   o  "Strict Shortest Path
            (Strict-SPF)": This algorithm mandates that<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      the packet is forwarded
            according to ECMP-aware SPF algorithm and<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      instructs any router in the
            path to ignore any possible local<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      policy overriding the SPF
            decision.  The SID advertised with<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      Strict-SPF algorithm ensures
            that the path the packet is going to<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">      take is the expected, and not
            altered, SPF path. 
            <span style="background:yellow;mso-highlight:yellow">Note
              that Fast<o:p></o:p></span></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black;background:yellow;mso-highlight:yellow">     
            Reroute (FRR) [<a href="https://tools.ietf.org/html/rfc5714"
              title="&quot;IP Fast Reroute Framework&quot;"
              moz-do-not-send="true"><span style="color:blue">RFC5714</span></a>]
            mechanisms are still compliant with the<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black;background:yellow;mso-highlight:yellow">     
            Strict Shortest Path.  In other words, a packet received
            with a<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black;background:yellow;mso-highlight:yellow">     
            Strict-SPF SID may be rerouted through a FRR mechanism</span><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">.<o:p></o:p></span></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">At the same time, the <a
href="https://tools.ietf..org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04"
            moz-do-not-send="true">
            TI-LFA draft</a> discusses protection of active Prefix-SIDs
          (e.g., in Section 3 that discusses P-Space and Q-space) but,
          to the best of my understanding, does not mention algorithms
          that form the context of these SIDs.
          <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">My question to the authors of the TI-LFA
          draft is: <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Are the mechanisms defined in the draft
          (and examples discussed in Section 4) applicable to
          Prefix-SIDs associated with the default forwarding algorithm
          as defined in the Segment Routing Architecture draft?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I strongly suspect that it is not so, and
          that these mechanisms are only compatible with the Strict-SPF.
          (Actually, I can provide an example that confirms this
          suspicion.)<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Do I miss something substantial here? <o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></p>
        <p class="MsoNormal">Sasha<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Office: +972-39266302<o:p></o:p></p>
        <p class="MsoNormal">Cell:      +972-549266302<o:p></o:p></p>
        <p class="MsoNormal">Email:   <a class="moz-txt-link-abbreviated" href="mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>
CC: Stewart Bryant <stewart.bryant@gmail.com>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
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Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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Content-Type: text/plain; charset="us-ascii"
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Stephane,

The default algorithm for Prefix-SIDs is defined in Section 3.1.1 of the S=
egment Routing Architecture<https://tools.ietf.org/html/draft-ietf-spring-=
segment-routing-15> draft as following (the important text is highlighted)=
:
   o  "Shortest Path": this algorithm is the default behavior.  The
      packet is forwarded along the well-known ECMP-aware SPF algorithm
      employed by the IGPs.  However it is explicitly allowed for a
      midpoint to implement another forwarding based on local policy.

Consider now the following scenario:


1.       The PLR node P uses a simple primary next hop N to reach a destin=
ation prefix D.

a.       IP FRR (as defined in RFC 5286<https://tools.ietf.org/html/rfc528=
6>) is enabled in this node, and it identifies the neighbor L of P  as a l=
ocal loop-free alternative for reaching D if the link P-->N fails.

b.       In addition, P computes its post-convergence path to D after fail=
ure of link P-->N, and decides that L is its primary NH in the post-conver=
gence topology.

c.       According to Section 4.1 of the TI-LFA draft, P decides that:

                                                               i.      N i=
s the repair node for reaching D when the link P-->N fails

                                                             ii.      The =
egress interface to use is the link P-->L

                                                           iii.      The r=
epair segment list is empty

2.       Now suppose that L is configured with a local policy that overrid=
es its SPF computation and sets its primary NH for reaching D to P

a.       Since this is a local policy (say, implemented using policy-based=
 routing), it remains unknown to P

b.       This policy will not result in any routing loop (at least in some=
 scenarios) as long as the link P-->N is OK

c.       Activation of this policy in L is conditional (how this can be do=
ne is not really important at the moment) so that when the link P-->N fail=
s, this policy would be deactivated

d.       However, when this link fails, the combination of the repair path=
 selected by P and the local policy configured in L will result in a routi=
ng loop that would exist until  IGP converges again.

Please note that RFC 5286 explicitly states that it is only applicable to =
intra-domain routing only with OSPF or IS-IS as IGP.
It does not mention the possibility of local policies overriding shortest =
path routing provided by these protocols.

Does this explanation help?
Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: stephane.litkowski@orange.com [mailto:stephane.litkowski@orange.com]=

Sent: Thursday, June 14, 2018 1:57 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draft-bashand=
y-rtgwg-segment-routing-ti-lfa.authors@ietf.org
Cc: Stewart Bryant <stewart.bryant@gmail.com>; Michael Gorokhovsky <Michae=
l.Gorokhovsky@ecitele.com>; draft-ietf-spring-segment-routing.authors@ietf=
.org; spring@ietf.org; rtgwg@ietf.org
Subject: RE: Is TI-LFA compatible with the default SR algorithm?

Hi Sasha,

Could you elaborate on :" I strongly suspect that it is not so, and that t=
hese mechanisms are only compatible with the Strict-SPF. (Actually, I can =
provide an example that confirms this suspicion.)" ?

Thanks,


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Alexander Vains=
htein
Sent: Wednesday, June 13, 2018 17:00
To: draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org<mailto:dr=
aft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
Cc: Stewart Bryant; Michael Gorokhovsky; draft-ietf-spring-segment-routing=
.authors@ietf.org<mailto:draft-ietf-spring-segment-routing.authors@ietf.or=
g>; spring@ietf.org<mailto:spring@ietf.org>; rtgwg@ietf.org<mailto:rtgwg@i=
etf.org>
Subject: [spring] Is TI-LFA compatible with the default SR algorithm?

Hi all,
I have looked up Section 3.1.1 "Prefix-SID Algorithm" of the Segment Routi=
ng Architecture<https://tools.ietf.org/html/draft-ietf-spring-segment-rout=
ing-15> draft (already In the RFC Editor queue) and found there the follow=
ing statement (the relevant part is highlighted):

This document defines two algorithms:

   o  "Shortest Path": this algorithm is the default behavior.  The
      packet is forwarded along the well-known ECMP-aware SPF algorithm
      employed by the IGPs.  However it is explicitly allowed for a
      midpoint to implement another forwarding based on local policy.
      The "Shortest Path" algorithm is in fact the default and current
      behavior of most of the networks where local policies may override
      the SPF decision.

   o  "Strict Shortest Path (Strict-SPF)": This algorithm mandates that
      the packet is forwarded according to ECMP-aware SPF algorithm and
      instructs any router in the path to ignore any possible local
      policy overriding the SPF decision.  The SID advertised with
      Strict-SPF algorithm ensures that the path the packet is going to
      take is the expected, and not altered, SPF path.  Note that Fast
      Reroute (FRR) [RFC5714<https://tools.ietf.org/html/rfc5714>] mechani=
sms are still compliant with the
      Strict Shortest Path.  In other words, a packet received with a
      Strict-SPF SID may be rerouted through a FRR mechanism.

At the same time, the TI-LFA draft<https://tools.ietf..org/html/draft-bash=
andy-rtgwg-segment-routing-ti-lfa-04> discusses protection of active Prefi=
x-SIDs (e.g., in Section 3 that discusses P-Space and Q-space) but, to the=
 best of my understanding, does not mention algorithms that form the conte=
xt of these SIDs.

My question to the authors of the TI-LFA draft is:

Are the mechanisms defined in the draft (and examples discussed in Section=
 4) applicable to Prefix-SIDs associated with the default forwarding algor=
ithm as defined in the Segment Routing Architecture draft?

I strongly suspect that it is not so, and that these mechanisms are only c=
ompatible with the Strict-SPF. (Actually, I can provide an example that co=
nfirms this suspicion.)

Do I miss something substantial here?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


__________________________________________________________________________=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
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delete the original
and all copies thereof.
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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Stephane,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The default algorithm=
 for Prefix-SIDs is defined in Section 3.1.1 of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">Segment Routing Architecture</a> draft as following (the important text=
 is highlighted):<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Shortest Path&quo=
t;: this algorithm is the default behavior.&nbsp; The<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; packet is for=
warded along the well-known ECMP-aware SPF algorithm<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; employed by t=
he IGPs.&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">However it is expli=
citly allowed for a<o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; midpoint to implement another forwarding based o=
n local policy</span><span style=3D"font-size:10.0pt;font-family:&quot;Cou=
rier New&quot;;color:black">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Consider now the foll=
owing scenario:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo1"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">The PLR node P uses a simple primary next hop N to reach a des=
tination prefix D.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">IP FRR (as defined in
<a href=3D"https://tools.ietf.org/html/rfc5286">RFC 5286</a>) is enabled i=
n this node, and it identifies the neighbor L of P &nbsp;as a local loop-f=
ree alternative for reaching D if the link P--&gt;N fails.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">In addition, P computes its post-convergence path to D after f=
ailure of link P--&gt;N, and decides that L is its primary NH in the post-=
convergence topology.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">c.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">According to Section 4.1 of the TI-LFA draft, P decides that:<=
o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt;text-indent:-10=
8.0pt;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>i.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"LTR"></sp=
an><span style=3D"color:#1F497D">N is the repair node for reaching D when =
the link P--&gt;N fails<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt;text-indent:-10=
8.0pt;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>ii.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"LTR"></s=
pan><span style=3D"color:#1F497D">The egress interface to use is the link =
P--&gt;L<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt;text-indent:-10=
8.0pt;mso-text-indent-alt:-9.0pt;mso-list:l0 level3 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>iii.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span dir=3D"LTR"></=
span><span style=3D"color:#1F497D">The repair segment list is empty<o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo1"><![if !supportLists]><span style=3D"color:#1F497D"><span style=3D=
"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">Now suppose that L is configured with a local policy that over=
rides its SPF computation and sets its primary NH for reaching D to P<o:p>=
</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">Since this is a local policy (say, implemented using policy-ba=
sed routing), it remains unknown to P<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">This policy will not result in any routing loop (at least in s=
ome scenarios) as long as the link P--&gt;N is OK<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">c.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">Activation of this policy in L is conditional (how this can be=
 done is not really important at the moment) so that when the link P--&gt;=
N fails, this policy would be deactivated<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list=
:Ignore">d.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D">However, when this link fails, the combination of the repair p=
ath selected by P and the local policy configured in L will result in a ro=
uting loop that would exist until &nbsp;IGP
 converges again.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Please note that RFC =
5286 explicitly states that it is only applicable to intra-domain routing =
only with OSPF or IS-IS as IGP.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">It does not mention t=
he possibility of local policies overriding shortest path routing provided=
 by these protocols.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Does this explanation=
 help?<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> stephane.litkowski@orange.com [mailto:=
stephane.litkowski@orange.com]
<br>
<b>Sent:</b> Thursday, June 14, 2018 1:57 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org<br>
<b>Cc:</b> Stewart Bryant &lt;stewart.bryant@gmail.com&gt;; Michael Gorokh=
ovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; draft-ietf-spring-segment-r=
outing.authors@ietf.org; spring@ietf.org; rtgwg@ietf.org<br>
<b>Subject:</b> RE: Is TI-LFA compatible with the default SR algorithm?<o:=
p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Could you elaborate o=
n :&#8221;</span> I strongly suspect that it is not so, and that these mec=
hanisms are only compatible with the Strict-SPF. (Actually, I can provide =
an example that confirms this suspicion.)&#8221; ?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quo=
t;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt=
;font-family:&quot;Tahoma&quot;,sans-serif"> spring [<a href=3D"mailto:spr=
ing-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> Wednesday, June 13, 2018 17:00<br>
<b>To:</b> <a href=3D"mailto:draft-bashandy-rtgwg-segment-routing-ti-lfa.a=
uthors@ietf.org">
draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org</a><br>
<b>Cc:</b> Stewart Bryant; Michael Gorokhovsky; <a href=3D"mailto:draft-ie=
tf-spring-segment-routing.authors@ietf.org">
draft-ietf-spring-segment-routing.authors@ietf.org</a>; <a href=3D"mailto:=
spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><=
br>
<b>Subject:</b> [spring] Is TI-LFA compatible with the default SR algorith=
m?</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have looked up Section 3.1.1 &#8220;<b>Prefix-SID=
 Algorithm</b>&#8221; of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">Segment Routing Architecture</a> draft (already In the RFC Editor queue=
) and found there the following statement (the relevant part is
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>)=
:<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">This document defines two algorithms:</span>=
<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Shortest Path&quo=
t;: this algorithm is the default behavior.&nbsp; The</span><o:p></o:p></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; packet is for=
warded along the well-known ECMP-aware SPF algorithm</span><o:p></o:p></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; employed by t=
he IGPs.&nbsp; However it is explicitly allowed for a</span><o:p></o:p></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; midpoint to i=
mplement another forwarding based on local policy.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The &quot;Sho=
rtest Path&quot; algorithm is in fact the default and current</span><o:p><=
/o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; behavior of m=
ost of the networks where local policies may override</span><o:p></o:p></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the SPF decis=
ion.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; o&nbsp; &quot;Strict Shortest P=
ath (Strict-SPF)&quot;: This algorithm mandates that</span><o:p></o:p></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the packet is=
 forwarded according to ECMP-aware SPF algorithm and</span><o:p></o:p></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instructs any=
 router in the path to ignore any possible local</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; policy overri=
ding the SPF decision.&nbsp; The SID advertised with</span><o:p></o:p></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Strict-SPF al=
gorithm ensures that the path the packet is going to</span><o:p></o:p></p>=

<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; take is the e=
xpected, and not altered, SPF path.&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">Note that Fast</spa=
n></span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Reroute (FRR) [<a href=3D"https://tools.ietf.org=
/html/rfc5714" title=3D"&quot;IP Fast Reroute Framework&quot;"><span style=
=3D"color:blue">RFC5714</span></a>]
 mechanisms are still compliant with the</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Strict Shortest Path.&nbsp; In other words, a pa=
cket received with a</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black;background:yellow;mso-highlight:yellow">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Strict-SPF SID may be rerouted through a FRR mec=
hanism</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New=
&quot;;color:black">.</span><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">At the same time, the <a href=3D"https://tools.ietf=
..org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04">
TI-LFA draft</a> discusses protection of active Prefix-SIDs (e.g., in Sect=
ion 3 that discusses P-Space and Q-space) but, to the best of my understan=
ding, does not mention algorithms that form the context of these SIDs.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">My question to the authors of the TI-LFA draft is: =
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Are the mechanisms defined in the draft (and exampl=
es discussed in Section 4) applicable to Prefix-SIDs associated with the d=
efault forwarding algorithm as defined in the Segment Routing Architecture=
 draft?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I strongly suspect that it is not so, and that thes=
e mechanisms are only compatible with the Strict-SPF. (Actually, I can pro=
vide an example that confirms this suspicion.)<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Do I miss something substantial here? <o:p></o:p></=
p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
Thread-Topic: Is TI-LFA compatible with the default SR algorithm?
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Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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Stewart,
Lots of thanks for a prompt and highly meaningful response.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Stewart Bryant [mailto:stewart.bryant@gmail.com]
Sent: Thursday, June 14, 2018 3:31 PM
To: stephane.litkowski@orange.com; Alexander Vainshtein <Alexander.Vainsht=
ein@ecitele.com>; draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf=
.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; draft-ietf-spri=
ng-segment-routing.authors@ietf.org; spring@ietf.org; rtgwg@ietf.org
Subject: Re: Is TI-LFA compatible with the default SR algorithm?


RFC5714 was written when we were focused on routing in base along normal D=
ijkstra shortest paths.

As policy and flexible algorithms become prevalent we need to specify that=
 any RFC5714 action is compliant to the policies and intended algorithms a=
long the entirety of its path.

We need to think this through carefully, but that may mean that in a netwo=
rk where any of these enhanced routing methods are deployed, ALL routers d=
oing FRR need to validate the safety of the packet path. There may be more=
 computationally efficient ways to do this, but worse case looks like need=
ing to precompute the full path to all destinations reachable via the fail=
ure including applying the policy and algorithms installed on all of those=
 routers. What I am unclear of is how we find that policy to do that.

Maybe I am being overly pessimistic here, but Sasha makes an interesting o=
bservation that we need to think through very carefully.

- Stewart

On 14/06/2018 11:56, stephane.litkowski@orange.com<mailto:stephane.litkows=
ki@orange.com> wrote:
Hi Sasha,

Could you elaborate on :" I strongly suspect that it is not so, and that t=
hese mechanisms are only compatible with the Strict-SPF. (Actually, I can =
provide an example that confirms this suspicion.)" ?

Thanks,


From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Alexander Vains=
htein
Sent: Wednesday, June 13, 2018 17:00
To: draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org<mailto:dr=
aft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
Cc: Stewart Bryant; Michael Gorokhovsky; draft-ietf-spring-segment-routing=
.authors@ietf.org<mailto:draft-ietf-spring-segment-routing.authors@ietf.or=
g>; spring@ietf.org<mailto:spring@ietf.org>; rtgwg@ietf.org<mailto:rtgwg@i=
etf.org>
Subject: [spring] Is TI-LFA compatible with the default SR algorithm?

Hi all,
I have looked up Section 3.1.1 "Prefix-SID Algorithm" of the Segment Routi=
ng Architecture<https://tools.ietf.org/html/draft-ietf-spring-segment-rout=
ing-15> draft (already In the RFC Editor queue) and found there the follow=
ing statement (the relevant part is highlighted):

This document defines two algorithms:

   o  "Shortest Path": this algorithm is the default behavior.  The
      packet is forwarded along the well-known ECMP-aware SPF algorithm
      employed by the IGPs.  However it is explicitly allowed for a
      midpoint to implement another forwarding based on local policy.
      The "Shortest Path" algorithm is in fact the default and current
      behavior of most of the networks where local policies may override
      the SPF decision.

   o  "Strict Shortest Path (Strict-SPF)": This algorithm mandates that
      the packet is forwarded according to ECMP-aware SPF algorithm and
      instructs any router in the path to ignore any possible local
      policy overriding the SPF decision.  The SID advertised with
      Strict-SPF algorithm ensures that the path the packet is going to
      take is the expected, and not altered, SPF path.  Note that Fast
      Reroute (FRR) [RFC5714<https://tools.ietf.org/html/rfc5714>] mechani=
sms are still compliant with the
      Strict Shortest Path.  In other words, a packet received with a
      Strict-SPF SID may be rerouted through a FRR mechanism.

At the same time, the TI-LFA draft<https://tools.ietf..org/html/draft-bash=
andy-rtgwg-segment-routing-ti-lfa-04> discusses protection of active Prefi=
x-SIDs (e.g., in Section 3 that discusses P-Space and Q-space) but, to the=
 best of my understanding, does not mention algorithms that form the conte=
xt of these SIDs.

My question to the authors of the TI-LFA draft is:

Are the mechanisms defined in the draft (and examples discussed in Section=
 4) applicable to Prefix-SIDs associated with the default forwarding algor=
ithm as defined in the Segment Routing Architecture draft?

I strongly suspect that it is not so, and that these mechanisms are only c=
ompatible with the Strict-SPF. (Actually, I can provide an example that co=
nfirms this suspicion.)

Do I miss something substantial here?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


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<body bgcolor=3D"white" lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">=

<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Stewart,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt and highly meaningful response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"color:windowtext">From:</span></b=
><span style=3D"color:windowtext"> Stewart Bryant [mailto:stewart.bryant@g=
mail.com]
<br>
<b>Sent:</b> Thursday, June 14, 2018 3:31 PM<br>
<b>To:</b> stephane.litkowski@orange.com; Alexander Vainshtein &lt;Alexand=
er.Vainshtein@ecitele.com&gt;; draft-bashandy-rtgwg-segment-routing-ti-lfa=
.authors@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; dr=
aft-ietf-spring-segment-routing.authors@ietf.org; spring@ietf.org; rtgwg@i=
etf.org<br>
<b>Subject:</b> Re: Is TI-LFA compatible with the default SR algorithm?<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p>RFC5714 was written when we were focused on routing in base along norma=
l Dijkstra shortest paths.<span style=3D"font-size:12.0pt"><o:p></o:p></sp=
an></p>
<p>As policy and flexible algorithms become prevalent we need to specify t=
hat any RFC5714 action is compliant to the policies and intended algorithm=
s along the entirety of its path.
<o:p></o:p></p>
<p>We need to think this through carefully, but that may mean that in a ne=
twork where any of these enhanced routing methods are deployed, ALL router=
s doing FRR need to validate the safety of the packet path. There may be m=
ore computationally efficient ways
 to do this, but worse case looks like needing to precompute the full path=
 to all destinations reachable via the failure including applying the poli=
cy and algorithms installed on all of those routers. What I am unclear of =
is how we find that policy to do that.<o:p></o:p></p>
<p>Maybe I am being overly pessimistic here, but Sasha makes an interestin=
g observation that we need to think through very carefully.<o:p></o:p></p>=

<p>- Stewart<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">On 14/06/2018 11:56, <a href=3D"mailto:stephane.lit=
kowski@orange.com">
stephane.litkowski@orange.com</a> wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Could you elaborate o=
n :&#8221;</span> I strongly suspect that it is not so, and that these mec=
hanisms are only compatible with the Strict-SPF. (Actually, I can provide =
an example that confirms this suspicion.)&#8221; ?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quo=
t;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt=
;font-family:&quot;Tahoma&quot;,sans-serif"> spring [<a href=3D"mailto:spr=
ing-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> Wednesday, June 13, 2018 17:00<br>
<b>To:</b> <a href=3D"mailto:draft-bashandy-rtgwg-segment-routing-ti-lfa.a=
uthors@ietf.org">
draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org</a><br>
<b>Cc:</b> Stewart Bryant; Michael Gorokhovsky; <a href=3D"mailto:draft-ie=
tf-spring-segment-routing.authors@ietf.org">
draft-ietf-spring-segment-routing.authors@ietf.org</a>; <a href=3D"mailto:=
spring@ietf.org">
spring@ietf.org</a>; <a href=3D"mailto:rtgwg@ietf.org">rtgwg@ietf.org</a><=
br>
<b>Subject:</b> [spring] Is TI-LFA compatible with the default SR algorith=
m?</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have looked up Section 3.1.1 &#8220;<b>Prefix-SID=
 Algorithm</b>&#8221; of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">Segment Routing Architecture</a> draft (already In the RFC Editor queue=
) and found there the following statement (the relevant part is
<span style=3D"background:yellow;mso-highlight:yellow">highlighted</span>)=
:<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">This document defines two algorithms:=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp; o&nbsp; &quot;Shortest P=
ath&quot;: this algorithm is the default behavior.&nbsp; The</span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; packet=
 is forwarded along the well-known ECMP-aware SPF algorithm</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; employ=
ed by the IGPs.&nbsp; However it is explicitly allowed for a</span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; midpoi=
nt to implement another forwarding based on local policy.</span><o:p></o:p=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The &q=
uot;Shortest Path&quot; algorithm is in fact the default and current</span=
><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; behavi=
or of most of the networks where local policies may override</span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the SP=
F decision.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp; o&nbsp; &quot;Strict Sho=
rtest Path (Strict-SPF)&quot;: This algorithm mandates that</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the pa=
cket is forwarded according to ECMP-aware SPF algorithm and</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instru=
cts any router in the path to ignore any possible local</span><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; policy=
 overriding the SPF decision.&nbsp; The SID advertised with</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Strict=
-SPF algorithm ensures that the path the packet is going to</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New ;color:black&quot;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; take i=
s the expected, and not altered, SPF path.&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">Note that Fast</spa=
n></span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Reroute (FRR) [<a href=3D"https://tools.ietf.org/html/rfc5714=
" title=3D"&quot;IP Fast Reroute Framework&quot;"><span style=3D"color:blu=
e">RFC5714</span></a>] mechanisms are still compliant with the</span><o:p>=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Strict Shortest Path.&nbsp; In other words, a packet received=
 with a</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Strict-SPF SID may be rerouted through a FRR mechanism</span>=
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New ;color:black=
&quot;,serif">.</span><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">At the same time, the <a href=3D"https://tools.ietf=
..org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04">
TI-LFA draft</a> discusses protection of active Prefix-SIDs (e.g., in Sect=
ion 3 that discusses P-Space and Q-space) but, to the best of my understan=
ding, does not mention algorithms that form the context of these SIDs.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">My question to the authors of the TI-LFA draft is: =
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Are the mechanisms defined in the draft (and exampl=
es discussed in Section 4) applicable to Prefix-SIDs associated with the d=
efault forwarding algorithm as defined in the Segment Routing Architecture=
 draft?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I strongly suspect that it is not so, and that thes=
e mechanisms are only compatible with the Strict-SPF. (Actually, I can pro=
vide an example that confirms this suspicion.)<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Do I miss something substantial here? <o:p></o:p></=
p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman , serif&quot;,serif"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
ation which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
<br>
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Thu, 14 Jun 2018 13:58:32 +0100
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Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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On 14/06/2018 13:45, Alexander Vainshtein wrote:
>
> Please note that RFC 5286 explicitly states that it is only applicable 
> to intra-domain routing only with OSPF or IS-IS as IGP.
>
> It does not mention the possibility of local policies overriding 
> shortest path routing provided by these protocols.
>

10 years ago when we were thinking about these early IPFRR schemes I 
don't recall anyone considering anything
other that simple Dijkstra paths for IP. The exception perhaps was 
Not-Via, but in that case base connectivity
and repair had orthogonal address spaces. I am not sure is that is the 
direction with policy and flex, but
that may be a required direction for unconditional safety.

- Stewart


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    <br>
    <div class="moz-cite-prefix">On 14/06/2018 13:45, Alexander
      Vainshtein wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:DB5PR0301MB190902EA5E6978D5FF16D0879D7D0@DB5PR0301MB1909.eurprd03.prod.outlook.com">
      <p class="MsoNormal"><span style="color:#1F497D">Please note that
          RFC 5286 explicitly states that it is only applicable to
          intra-domain routing only with OSPF or IS-IS as IGP.<o:p></o:p></span></p>
      <p class="MsoNormal"><span style="color:#1F497D">It does not
          mention the possibility of local policies overriding shortest
          path routing provided by these protocols.</span></p>
    </blockquote>
    <br>
    10 years ago when we were thinking about these early IPFRR schemes I
    don't recall anyone considering anything <br>
    other that simple Dijkstra paths for IP. The exception perhaps was
    Not-Via, but in that case base connectivity <br>
    and repair had orthogonal address spaces. I am not sure is that is
    the direction with policy and flex, but <br>
    that may be a required direction for unconditional safety.<br>
    <br>
    - Stewart<br>
    <br>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "draft-ietf-spring-segment-routing.authors@ietf.org" <draft-ietf-spring-segment-routing.authors@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org" <draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org>
Thread-Topic: Is TI-LFA compatible with the default SR algorithm?
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/yLgYWm6imfDbVtl6SzJ2J__G2QI>
Subject: Re: [spring] Is TI-LFA compatible with the default SR algorithm?
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Stewart,
Lots of thanks for the clarification.

Coming back to the TI-LFA draft, I think that it should explicitly state t=
hat  in the case of Prefix-SIDs it is applicable to Prefix-SIDs associated=
 with the  strict SPF algorithm but does not guarantee any results in the =
case of Prefix-SIDs associated with the default algorithm.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Stewart Bryant [mailto:stewart.bryant@gmail.com]
Sent: Thursday, June 14, 2018 3:59 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; stephane.litk=
owski@orange.com
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; draft-ietf-spri=
ng-segment-routing.authors@ietf.org; spring@ietf.org; rtgwg@ietf.org; draf=
t-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org
Subject: Re: Is TI-LFA compatible with the default SR algorithm?




On 14/06/2018 13:45, Alexander Vainshtein wrote:
Please note that RFC 5286 explicitly states that it is only applicable to =
intra-domain routing only with OSPF or IS-IS as IGP.
It does not mention the possibility of local policies overriding shortest =
path routing provided by these protocols.

10 years ago when we were thinking about these early IPFRR schemes I don't=
 recall anyone considering anything
other that simple Dijkstra paths for IP. The exception perhaps was Not-Via=
, but in that case base connectivity
and repair had orthogonal address spaces. I am not sure is that is the dir=
ection with policy and flex, but
that may be a required direction for unconditional safety.

- Stewart

__________________________________________________________________________=
_

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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Stewart,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Lots of thanks for the clarificatio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Coming back to the TI-LFA draft, I =
think that it should explicitly state that &nbsp;in the case of Prefix-SID=
s it is applicable to Prefix-SIDs associated with the
 &nbsp;strict SPF algorithm but does not guarantee any results in the case=
 of Prefix-SIDs associated with the default algorithm.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Office: &#43;972-39266302<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D">Email:&nbsp;&nbsp; Alexander.Vainsh=
tein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quo=
t;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span style=3D=
"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowt=
ext"> Stewart Bryant [mailto:stewart.bryant@gmail.com]
<br>
<b>Sent:</b> Thursday, June 14, 2018 3:59 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
stephane.litkowski@orange.com<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; dr=
aft-ietf-spring-segment-routing.authors@ietf.org; spring@ietf.org; rtgwg@i=
etf.org; draft-bashandy-rtgwg-segment-routing-ti-lfa.authors@ietf.org<br>
<b>Subject:</b> Re: Is TI-LFA compatible with the default SR algorithm?<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">On 14/06/2018 13:45, Alexander Vainshtein wrote:<o:=
p></o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto"><span style=3D"color:#1F497D">Please note that RFC 5286 explicit=
ly states that it is only applicable to intra-domain routing only with OSP=
F or IS-IS as IGP.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto"><span style=3D"color:#1F497D">It does not mention the possibilit=
y of local policies overriding shortest path routing provided by these pro=
tocols.</span><o:p></o:p></p>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
10 years ago when we were thinking about these early IPFRR schemes I don't=
 recall anyone considering anything
<br>
other that simple Dijkstra paths for IP. The exception perhaps was Not-Via=
, but in that case base connectivity
<br>
and repair had orthogonal address spaces. I am not sure is that is the dir=
ection with policy and flex, but
<br>
that may be a required direction for unconditional safety.<br>
<br>
- Stewart<o:p></o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this <BR>
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original <BR>
and all copies thereof.<BR>
__________________________________________________________________________=
_<BR>
</body>
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Fri, 15 Jun 2018 10:47:44 -0700
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To: Loa Andersson <loa@pi.nu>
Cc: "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>,  "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,  "draft-xu-mpls-sr-over-ip@ietf.org" <draft-xu-mpls-sr-over-ip@ietf.org>
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Subject: Re: [spring] [mpls] draft-xu-mpls-sr-over-ip
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As a contributor of the current version of the document:



I am not aware of any IPRs related to this document.



--

Uma C.


On Thu, Jun 7, 2018 at 3:15 AM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
> /Loa
>  mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr">


















<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)">As a contributor of the current
version of the document:<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)"><span>=C2=A0</span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)">I am not aware of any IPRs
related to this document.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)"><span>=C2=A0</span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)">--<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"color:rgb(31,73,1=
25)">Uma C.<span></span></span></p>





<br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu,=
 Jun 7, 2018 at 3:15 AM, Loa Andersson <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">Working Group,<br>
<br>
We are currently preparing draft draft-xu-mpls-sr-over-ip for working<br>
group adoption.<br>
<br>
Part of this preparation is to do an IPR poll.<br>
<br>
This mail is to start the IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.<br=
>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS WG mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
We have copied this mail to the SPRING wg mailing list for information.<br>
If you receive this mail over the SPRING wg mailing list, and are aware<br>
of IPRs that apply to the draft, please notify the MPLS wg list.<br>
<br>
<br>
/Loa<br>
=C2=A0mpls wg co-chair<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

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From: <bruno.decraene@orange.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-ietf-spring-segment-routing-mpls.authors@ietf.org" <draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
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Thread-Topic: RtgDir Early review: draft-ietf-spring-segment-routing-mpls-13
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Date: Mon, 18 Jun 2018 07:38:13 +0000
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From: James Bensley <jwbensley@gmail.com>
Date: Mon, 18 Jun 2018 08:30:19 +0100
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Subject: Re: [spring] [Editorial Errata Reported] RFC7855 (5384)
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On 8 June 2018 at 09:58, Adrian Farrel <adrian@olddog.co.uk> wrote:
> James,
>
> I believe "iff" was intended as written.
>
> https://en.wikipedia.org/wiki/If_and_only_if
>
> Adrian

Hi Adrian,

That seems like a handy acronym and I'm not against it's use. I'm just
questioning how commonly used it is in networking circles and thus,
whether this document should have a glossary or not? After a quick
scan of "recent" RFCs it's not in common use (only one other RFC apart
from this one);

$ for i in `seq 5000 8500`; do wget
"https://www.rfc-editor.org/rfc/rfc$i.txt"; done

$ grep " iff " *.txt | awk '{print $1}' | uniq
rfc7242.txt:
rfc7855.txt:

Cheers,
James.


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Rob,

Two things

- do we have an available current state of the charter-to-bu-updated
   text.
- inline plz

On 2018-06-04 18:44, Rob Shakir wrote:
> Michael,
> 
> Thanks for the comment.
> 
> On Mon, Jun 4, 2018 at 9:42 AM Michael McBride 
> <Michael.McBride@huawei.com <mailto:Michael.McBride@huawei.com>> wrote:
> 
>     It would be helpful, while updating the charter, to state whether
>     multicast in SR is in/out of scope in order to know which wg to take
>     our future work.
> 
> 
> I think this is impractical. 

Yes, I agree that it is impractical have "everything" out of scope
listed. However for things being brought up for discussion we need
clear decisions/consensus documented on the mailing list.

Does your statement mean that "multicast in SR" is out of scope for
SPRING?

/Loa


If we state everything that is in or out of
> scope, we'll end up with a laundry list. The aim of the charter is to 
> define clearly the work that the WG should focus on. It does not mean 
> that we can never host discussion of individual drafts if they are 
> relevant. If there are requirements, we can always recharter if 
> something new becomes the highest priority for the industry w.r.t SR.
> 
> Kind regards,
> r.
> 
> 
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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Hi all,



During IETF 102, the SPRING WG is currently scheduled to meet Monday 13:30-=
15:30. We have a two hours session.
https://datatracker.ietf.org/meeting/102/agenda.html


It is time start building the SPRING WG agenda for Montreal.

Please send your request for a presentation slot, indicating draft name, sp=
eaker, and desired duration (covering presentation and discussion), before =
Monday 2018-07-02  09:00 CET. Before is better.

If it is not the first presentation of a non-WG draft, please give a reason=
 why it is required to have a new presentation slot.

A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik=
i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting



As we are meeting on Monday, please send your slides on time, before Sunday=
 18:00 local time. Earlier is better.


Thanks,
--Bruno, Rob

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<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,&quot;sans-serif&quot;">Hi all,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,&quot;sans-serif&quot;">During IETF 102, the SPRING WG is currentl=
y scheduled to meet Monday 13:30-15:30. We have a two hours session.<o:p></=
o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;"><a href=3D"https://datatra=
cker.ietf.org/meeting/102/agenda.html">https://datatracker.ietf.org/meeting=
/102/agenda.html</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">It is time start building th=
e SPRING WG agenda for Montreal.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Please send your request for=
 a presentation slot, indicating draft name, speaker, and desired duration =
(covering presentation and discussion), before Monday 2018-07-02 &nbsp;09:0=
0 CET. Before is better.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">If it is not the first prese=
ntation of a non-WG draft, please give a reason why it is required to have =
a new presentation slot.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">A checklist is available on =
the wiki: <a href=3D"https://trac.ietf.org/trac/spring/wiki/Checklist%20for=
%20presenting%20at%20a%20SPRING%20meeting">
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">As we are meeting on Monday,=
 please send your slides on time, before Sunday 18:00 local time. Earlier i=
s better.<o:p></o:p></span></p>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;">Thanks,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;">--Bruno, Rob<o:p></o:p></s=
pan></p>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
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they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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</PRE></body>
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Mirja KÃ¼hlewind has entered the following ballot position for
draft-ietf-spring-segment-routing-ldp-interop-13: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


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for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm not sure if informational status wouldn't be more applicable to this doc
but I also fine with Proposed Standard.

nits:
1) In sec 3.1.1 I assume "neighbor" and not "neighbot" is meant...

2) In sec 3.2 this could probably be an upper case MAY:
"Multiple SRMSs may be present in the same network (for redundancy)."



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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
Date: Mon, 18 Jun 2018 07:37:56 -0500
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To: Mirja Kuehlewind <ietf@kuehlewind.net>
Cc: IESG <iesg@ietf.org>, robjs@google.com, spring-chairs@ietf.org,  spring@ietf.org, draft-ietf-spring-segment-routing-ldp-interop@ietf.org,  "Alvaro Retana (aretana)" <aretana.ietf@gmail.com>
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Not my ballot thread, but ...

On Mon, Jun 18, 2018 at 7:29 AM Mirja K=C3=BChlewind <ietf@kuehlewind.net> =
wrote:

> Mirja K=C3=BChlewind has entered the following ballot position for
> draft-ietf-spring-segment-routing-ldp-interop-13: No Objection
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
>
> https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-in=
terop/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> I'm not sure if informational status wouldn't be more applicable to this
> doc
> but I also fine with Proposed Standard.
>
> nits:
> 1) In sec 3.1.1 I assume "neighbor" and not "neighbot" is meant...
>

This is either the best typo or the best  portmanteau(*) I've seen on an
IESG evaluation ballot in the last five years.

I look forward to finding out whether it's intentional!

Spencer

(*) If it is a portmanteau, it's well worthy of inclusion in
https://www.vappingo.com/word-blog/86-great-examples-of-portmanteau/.

2) In sec 3.2 this could probably be an upper case MAY:
> "Multiple SRMSs may be present in the same network (for redundancy)."
>
>
>

--0000000000007b5ecc056ee9d67b
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<div dir=3D"ltr">Not my ballot thread, but ...<div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr">On Mon, Jun 18, 2018 at 7:29 AM Mirja K=C3=BChlewin=
d &lt;<a href=3D"mailto:ietf@kuehlewind.net">ietf@kuehlewind.net</a>&gt; wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Mirja K=C3=
=BChlewind has entered the following ballot position for<br>
draft-ietf-spring-segment-routing-ldp-interop-13: No Objection<br>
<br>
When responding, please keep the subject line intact and reply to all<br>
email addresses included in the To and CC lines. (Feel free to cut this<br>
introductory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-crit=
eria.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/s=
tatement/discuss-criteria.html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routi=
ng-ldp-interop/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.i=
etf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/</a><br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
COMMENT:<br>
----------------------------------------------------------------------<br>
<br>
I&#39;m not sure if informational status wouldn&#39;t be more applicable to=
 this doc<br>
but I also fine with Proposed Standard.<br>
<br>
nits:<br>
1) In sec 3.1.1 I assume &quot;neighbor&quot; and not &quot;neighbot&quot; =
is meant...<br></blockquote><div><br></div><div>This is either the best typ=
o or the best=C2=A0=C2=A0portmanteau(*) I&#39;ve seen on an IESG evaluation=
 ballot in the last five years.=C2=A0</div><div><br></div><div>I look forwa=
rd to finding out whether it&#39;s intentional!=C2=A0</div><div><br></div><=
div>Spencer</div><div><br></div><div>(*) If it is a portmanteau, it&#39;s w=
ell worthy of inclusion in=C2=A0<a href=3D"https://www.vappingo.com/word-bl=
og/86-great-examples-of-portmanteau/">https://www.vappingo.com/word-blog/86=
-great-examples-of-portmanteau/</a>.</div><div><br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">2) In sec 3.2 this could probably be an up=
per case MAY:<br>
&quot;Multiple SRMSs may be present in the same network (for redundancy).&q=
uot;<br>
<br>
<br>
</blockquote></div></div></div>

--0000000000007b5ecc056ee9d67b--


From nobody Mon Jun 18 05:50:31 2018
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From: James N Guichard <james.n.guichard@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
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Hi Bruno,

I would like to get a 15 minute slot (10 to present, 5 Q&A) to present http=
s://datatracker.ietf.org/doc/draft-guichard-sfc-nsh-sr/ .. speaker will be =
myself.

Thanks!

Jim

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Monday, June 18, 2018 6:30 AM
To: spring@ietf.org
Subject: [spring] IETF 102 - SPRING meeting


Hi all,



During IETF 102, the SPRING WG is currently scheduled to meet Monday 13:30-=
15:30. We have a two hours session.
https://datatracker.ietf.org/meeting/102/agenda.html


It is time start building the SPRING WG agenda for Montreal.

Please send your request for a presentation slot, indicating draft name, sp=
eaker, and desired duration (covering presentation and discussion), before =
Monday 2018-07-02  09:00 CET. Before is better.

If it is not the first presentation of a non-WG draft, please give a reason=
 why it is required to have a new presentation slot.

A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik=
i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting



As we are meeting on Monday, please send your slides on time, before Sunday=
 18:00 local time. Earlier is better.


Thanks,
--Bruno, Rob

___________________________________________________________________________=
______________________________________________



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Bruno,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I would like to get a =
15 minute slot (10 to present, 5 Q&amp;A) to present
<a href=3D"https://datatracker.ietf.org/doc/draft-guichard-sfc-nsh-sr/">htt=
ps://datatracker.ietf.org/doc/draft-guichard-sfc-nsh-sr/</a> .. speaker wil=
l be myself.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks!<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Jim<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"color:#1F=
497D"><o:p>&nbsp;</o:p></span></a></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring [mailto:spring-bounces@ietf.org]=
 <b>On Behalf Of
</b>bruno.decraene@orange.com<br>
<b>Sent:</b> Monday, June 18, 2018 6:30 AM<br>
<b>To:</b> spring@ietf.org<br>
<b>Subject:</b> [spring] IETF 102 - SPRING meeting<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">Hi all,<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">During IETF 102, the SPRING WG is currently scheduled to meet Monday =
13:30-15:30. We have a two hours session.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><a href=3D"https://datatracker.ietf.org/meeting/102/a=
genda.html">https://datatracker.ietf.org/meeting/102/agenda.html</a><o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText">It is time start building the SPRING WG agenda fo=
r Montreal.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please send your request for a presentation slot,=
 indicating draft name, speaker, and desired duration (covering presentatio=
n and discussion), before Monday 2018-07-02 &nbsp;09:00 CET. Before is bett=
er.
<o:p></o:p></p>
<p class=3D"MsoPlainText">If it is not the first presentation of a non-WG d=
raft, please give a reason why it is required to have a new presentation sl=
ot.<o:p></o:p></p>
<p class=3D"MsoPlainText">A checklist is available on the wiki: <a href=3D"=
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting">
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As we are meeting on Monday, please send your sli=
des on time, before Sunday 18:00 local time. Earlier is better.<o:p></o:p><=
/p>
<pre><o:p>&nbsp;</o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">--Bruno, Rob<o:p></o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
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<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
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<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
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<pre><span lang=3D"FR">If you have received this email in error, please not=
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<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
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re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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From: Rob Shakir <robjs@google.com>
Date: Mon, 18 Jun 2018 07:19:27 -0700
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Cc: Alvaro Retana <aretana.ietf@gmail.com>, "BRUNGARD, DEBORAH A" <db3546@att.com>,  "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, Martin Vigoureux <martin.vigoureux@nokia.com>,  Martin.Horneffer@telekom.de, Rob Shakir <rjs@rob.sh>, adrian@olddog.co.uk,  "bruno.decraene@orange.com> <bruno.decraene@orange.com" <bruno.decraene@orange.com>, sprevidi@cisco.com, spring@ietf.org,  stephane.litkowski@orange.com
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--00000000000087c456056eeb4160
Content-Type: text/plain; charset="UTF-8"

iff is common language in most technical/academic documentation I believe.
Whilst I am sympathetic to wanting to ensure that RFCs are as easy to parse
as possible for as wide an audience as possible I think that we have to
have some level at which we assume the reader can refer to external
references should they not be familiar with the terminology used. The RFC
Editor team is good at keeping authors honest around this bar.

James - I would encourage you to review the documents that are in last call
in the working group for these kinds of clarifications if you have time
please. Making these edits before we cut an RFC is preferable.

Thanks!
r.

On Mon, Jun 18, 2018, 12:30 AM James Bensley <jwbensley@gmail.com> wrote:

> On 8 June 2018 at 09:58, Adrian Farrel <adrian@olddog.co.uk> wrote:
> > James,
> >
> > I believe "iff" was intended as written.
> >
> > https://en.wikipedia.org/wiki/If_and_only_if
> >
> > Adrian
>
> Hi Adrian,
>
> That seems like a handy acronym and I'm not against it's use. I'm just
> questioning how commonly used it is in networking circles and thus,
> whether this document should have a glossary or not? After a quick
> scan of "recent" RFCs it's not in common use (only one other RFC apart
> from this one);
>
> $ for i in `seq 5000 8500`; do wget
> "https://www.rfc-editor.org/rfc/rfc$i.txt"; done
>
> $ grep " iff " *.txt | awk '{print $1}' | uniq
> rfc7242.txt:
> rfc7855.txt:
>
> Cheers,
> James.
>

--00000000000087c456056eeb4160
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<span>iff is common language in most technical/academic documentation I bel=
ieve. Whilst I am sympathetic to wanting to ensure that RFCs are as easy to=
 parse as possible for as wide an audience as possible I think that we have=
 to have some level at which we assume the reader can refer to external ref=
erences should they not be familiar with the terminology used. The RFC Edit=
or team is good at keeping authors honest around this bar.=C2=A0</span><div=
><br></div><div>James - I would encourage you to review the documents that =
are in last call in the working group for these kinds of clarifications if =
you have time please. Making these edits before we cut an RFC is preferable=
.=C2=A0</div><div><br></div><div>Thanks!</div><div>r.=C2=A0<br><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr">On Mon, Jun 18, 2018, 12:30 AM James Be=
nsley &lt;<a href=3D"mailto:jwbensley@gmail.com">jwbensley@gmail.com</a>&gt=
; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .=
8ex;border-left:1px #ccc solid;padding-left:1ex">On 8 June 2018 at 09:58, A=
drian Farrel &lt;<a href=3D"mailto:adrian@olddog.co.uk" target=3D"_blank">a=
drian@olddog.co.uk</a>&gt; wrote:<br>
&gt; James,<br>
&gt;<br>
&gt; I believe &quot;iff&quot; was intended as written.<br>
&gt;<br>
&gt; <a href=3D"https://en.wikipedia.org/wiki/If_and_only_if" rel=3D"norefe=
rrer" target=3D"_blank">https://en.wikipedia.org/wiki/If_and_only_if</a><br=
>
&gt;<br>
&gt; Adrian<br>
<br>
Hi Adrian,<br>
<br>
That seems like a handy acronym and I&#39;m not against it&#39;s use. I&#39=
;m just<br>
questioning how commonly used it is in networking circles and thus,<br>
whether this document should have a glossary or not? After a quick<br>
scan of &quot;recent&quot; RFCs it&#39;s not in common use (only one other =
RFC apart<br>
from this one);<br>
<br>
$ for i in `seq 5000 8500`; do wget<br>
&quot;<a href=3D"https://www.rfc-editor.org/rfc/rfc$i.txt" rel=3D"noreferre=
r" target=3D"_blank">https://www.rfc-editor.org/rfc/rfc$i.txt</a>&quot;; do=
ne<br>
<br>
$ grep &quot; iff &quot; *.txt | awk &#39;{print $1}&#39; | uniq<br>
rfc7242.txt:<br>
rfc7855.txt:<br>
<br>
Cheers,<br>
James.<br>
</blockquote></div></div>

--00000000000087c456056eeb4160--


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From: "Zafar Ali (zali)" <zali@cisco.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
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From: Rob Shakir <robjs@google.com>
Date: Mon, 18 Jun 2018 08:39:52 -0700
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To: "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
Cc: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Zafar Ali (zali)" <zali@cisco.com>,  "bruno.decraene@orange.com" <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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Zafar,

I'm not sure I agree with this statement:

*> The new text is assuming a solution (as reasoned in my earlier email,
e.g., a (fully) controller-based solution will not require "mechanism to
identify sets of resources in networks"). *

If the forwarding resource to be used is more granular than a link then we
do not have a way that this can be exposed to a controller today. Equally,
in all practical deployments today, using Adj-SID stacks is not actually
possible at a controller. The intention of this bullet was to cover such
scenarios.

That said -- yes, we would like to be consistent in what should be added to
the list here. This seems an open area that is of interest to folks in the
WG; it does not look to be addressable with the current set of mechanisms
that are defined in the architecture; and does not appear to be outside of
the general areas that we defined in the original charter. This was the bar
we've tried to apply across work items. An analogue here would be the
stateless service chaining bullet.

Note that this bullet is *not* a milestone. No milestones are in the text
that I shared. The intention of this list is to provide a focused set of
things to work on within the next iteration of work within SPRING.

I encourage debate of the technical point around whether the existing
mechanisms can achieve the use cases that Jie is raising -- please fork the
thread for this!

Thanks,
r.

On Mon, Jun 18, 2018 at 8:25 AM Zafar Ali (zali) <zali=3D
40cisco.com@dmarc.ietf.org> wrote:

> Hi Jie,
>
>
>
> Thanks for your follow-up.
>
>
>
> I am ok with the text in the "current" Charter. That is because the
> "current" text does NOT assume a solution. By converting the current text
>
>
>
> Current Charter Text: Some types of network virtualization, including
> multi-topology networks and the partitioning of network resources for VPN=
s.
>
>
>
> To
>
>
>
> New WG work-item/ milestone: "Using SR as the mechanism to identify sets
> of resources in networks with SR-MPLS and SRv6 dataplanes"
>
>
>
> The new text is assuming a solution (as reasoned in my earlier email,
> e.g., a (fully) controller-based solution will not require "mechanism to
> identify sets of resources in networks").
>
>
>
> I would suggest the following change:
>
> "Using SR as the mechanism for partitioning network resources with SR-MPL=
S
> and SRv6 data planes."
>
>
>
> Secondly, the earlier the text was part of the charter and not a
> milestone. Hence, my previous comment on the logic of adding this task to
> the "work items" list still applies. And if we include this as a
> work-items, why did we drop a few items raised by many (before/ during IE=
TF
> in London and as part of the review of the charter draft) on the list for
> inclusion in the "work items" list. I am hoping for consistency in making
> such determination in the final version of the charter.
>
>
>
> Thanks
>
>
>
> Regards =E2=80=A6 Zafar
>
>
>
> *From: *"Dongjie (Jimmy)" <jie.dong@huawei.com>
> *Date: *Friday, June 15, 2018 at 11:13 AM
> *To: *"Zafar Ali (zali)" <zali@cisco.com>, "Zafar Ali (zali)" <zali=3D
> 40cisco.com@dmarc.ietf.org>, "bruno.decraene@orange.com" <
> bruno.decraene@orange.com>
> *Cc: *SPRING WG List <spring@ietf.org>, Rob Shakir <robjs=3D
> 40google.com@dmarc.ietf.org>
> *Subject: *=E7=AD=94=E5=A4=8D: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Zafar,
>
>
>
> I=E2=80=99d like to remind you that in the current SPRING charter there i=
s already
> one work item as below:
>
>
>
>  o    Some types of network virtualization, including multi-
>
>        topology networks and the partitioning of network
>
>        resources for VPNs
>
>
>
> IMO the work item you are referring to is not a new one, actually it is a=
n
> update or rephrasing of the previous one. Thus it is not relevant to the
> logic of adding new work items. The VPN+ drafts are just piece of work
> matching with this existing work item.
>
>
>
> I believe there is consistent rules of adding new work items to the
> charter, and it would be very helpful to concentrate on constructive
> discussion of those topics.
>
>
>
> Best regards,
>
> Jie
>
>
>
> *=E5=8F=91**=E4=BB=B6=E4=BA=BA**:* Zafar Ali (zali) [mailto:zali@cisco.co=
m]
> *=E5=8F=91**=E9=80=81**=E6=97=B6=E9=97=B4**:* 2018=E5=B9=B46=E6=9C=8814=
=E6=97=A5 19:44
> *=E6=94=B6=E4=BB=B6=E4=BA=BA**:* Dongjie (Jimmy) <jie.dong@huawei.com>; Z=
afar Ali (zali) <zali=3D
> 40cisco.com@dmarc.ietf.org>; bruno.decraene@orange.com
> *=E6=8A=84=E9=80=81**:* SPRING WG List <spring@ietf.org>; Rob Shakir <rob=
js=3D
> 40google.com@dmarc.ietf.org>; Zafar Ali (zali) <zali@cisco.com>
> *=E4=B8=BB**=E9=A2=98**:* Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Jie,
>
>
>
> While I look forward to reviewing the draft, at the moment of writing the
> charter no such details were available. At the moment we do not know if
> this would be an architecturally correct option to adopt in segment
> routing; what type of complexity, statefulness and scalability concerns i=
t
> brings to the table. We also don't know if this is a matter of local
> implementation or are we better off if it is entirely done at the
> controller, etc.
>
>
>
> The work you are doing is already in the charter by the virtue of "SPRING
> WG serves as a forum to discuss SPRING networks operations, define new
> applications, and specify extensions of Segment Routing technologies."
>
>
>
> What puzzles me is the logic of adding this task to the "work items" list=
.
> And if we go with the same logic, why did we drop a few items raised by
> many (before/ during IETF in London and as part of the review of the
> charter draft) on the list for inclusion in the "work items" list. I am
> hoping for consistency in making such determination in the final version =
of
> the charter.
>
>
>
> Thanks
>
>
>
> Regards =E2=80=A6 Zafar
>
>
>
> *From: *spring <spring-bounces@ietf.org> on behalf of "Dongjie (Jimmy)" <
> jie.dong@huawei.com>
> *Date: *Wednesday, June 13, 2018 at 11:26 PM
> *To: *"Zafar Ali (zali)" <zali=3D40cisco.com@dmarc.ietf.org>, "
> bruno.decraene@orange.com" <bruno.decraene@orange.com>
> *Cc: *SPRING WG List <spring@ietf.org>, "Zafar Ali (zali)" <zali@cisco.co=
m>,
> Rob Shakir <robjs=3D40google.com@dmarc.ietf.org>
> *Subject: *Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Zafar,
>
>
>
> As mentioned in my previous mail, the VPN+ drafts and this work item
> require new functionality to be added to SR, which is to associate SR wit=
h
> particular allocated resources and treatment. IMO this is not covered by
> existing SR mechanisms. It is different from Diffserv QoS, and it is not
> pure controller-based accounting, because in the data plane some mechanis=
m
> is needed to make sure different services will be treated accordingly and
> not impact each other.
>
>
>
> Thanks for the comments in London, we are working on the updates of the
> VPN+ drafts, hopefully they will be published for open review soon.
>
>
>
> Best regards,
>
> Jie
>
>
>
> *From:* spring [mailto:spring-bounces@ietf.org <spring-bounces@ietf.org>]=
 *On
> Behalf Of *Zafar Ali (zali)
> *Sent:* Wednesday, June 13, 2018 11:30 PM
> *To:* bruno.decraene@orange.com; Zafar Ali (zali) <
> zali=3D40cisco.com@dmarc.ietf.org>
> *Cc:* SPRING WG List <spring@ietf.org>; Zafar Ali (zali) <zali@cisco.com>=
;
> Rob Shakir <robjs=3D40google.com@dmarc.ietf.org>
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
>
>
> Hi Bruno,
>
>
>
> I am aware of the VPN+ draft but IMO this document or Slicing, in general=
,
> is an informational use-case document (E.g., similarly SD-WAN does not ha=
ve
> a milestone in the Charter). I do not think that there is any new behavio=
r
> needed beyond SRTE, SRVPN, Flex-Algo, Diffserv QoS and SR SFC, etc. What =
is
> missing is the controller doing the bandwidth (resource) accounting but
> this outside the scope of IETF. Furthermore, the specifics in the VPN+
> specifics draft against this milestone are missing. The same comments wer=
e
> also raised when draft-dong-spring-sr-for-enhanced-vpn was presented to t=
he
> Spring WG in London.
>
>
>
> Thanks
>
>
>
> Regards =E2=80=A6 Zafar
>
>
>
> *From: *"bruno.decraene@orange.com" <bruno.decraene@orange.com>
> *Date: *Tuesday, June 12, 2018 at 12:13 PM
> *To: *"Zafar Ali (zali)" <zali=3D40cisco.com@dmarc.ietf.org>
> *Cc: *"Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <
> robjs=3D40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
> *Subject: *RE: [spring] Updating the SPRING WG Charter
>
>
>
> Dear Zafar,
>
>
>
> Please see inline [Bruno]
>
>
>
> *From:* spring [mailto:spring-bounces@ietf.org <spring-bounces@ietf.org>]=
 *On
> Behalf Of *Zafar Ali (zali)
> *Sent:* Tuesday, June 12, 2018 3:45 PM
> *To:* Rob Shakir; SPRING WG List
> *Cc:* Zafar Ali (zali)
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
>
>
> Dear Rob, Bruno,
>
>
>
> I have a question on the specifics of the following milestone:
>
>
>
>    - Using SR as the mechanism to identify sets of resources in networks
>    with SR-MPLS and SRv6 dataplanes.
>
>
>
> I do not know of any specific use-case, requirement or an individual draf=
t
> associated with this milestone beyond what is already covered by other
> milestones (e.g., by =E2=80=9CSegment Routing policies and the associated=
 steering
> and traffic engineering mechanisms=E2=80=9D). What specific deliverable y=
ou have in
> mind? Is there an individual(s) draft against this milestone? Please advi=
se.
>
>
>
> [Bruno] Would the following pointers provide enough context?
>
> https://mailarchive.ietf.org/arch/msg/spring/canXoxLZCwRZ_yFcV3U7RXRwfpM
>
>
> https://tools.ietf.org/html/draft-bryant-rtgwg-enhanced-vpn-02#section-4.=
3.6
>
>
> https://tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-00#sect=
ion-2
>
>
>
> Regards,
>
> --Bruno
>
>
>
> Thanks
>
>
>
> Regards =E2=80=A6 Zafar
>
>
>
> *From: *spring <spring-bounces@ietf.org> on behalf of Rob Shakir <
> robjs=3D40google.com@dmarc.ietf.org>
> *Date: *Friday, June 1, 2018 at 12:07 PM
> *To: *SPRING WG List <spring@ietf.org>
> *Subject: *[spring] Updating the SPRING WG Charter
>
>
>
> Hi SPRING,
>
>
>
> After the discussions on the list and in London relating to the charter,
> Bruno and I have been working to propose a new charter for the WG with
> Martin, and the other routing ADs. The text for this suggested charter is
> below. We would like to solicit WG feedback on the charter text prior to
> Martin taking to the IESG. We'd like to try and get the charter agreed
> prior to IETF 102 in Montr=C3=A9al.
>
>
>
> The Source Packet Routing in NetworkinG (SPRING) Working Group is the hom=
e
> of
>
> Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG
> serves as
>
> a forum to discuss SPRING networks operations, define new applications, a=
nd
>
> specify extensions of Segment Routing technologies.
>
>
>
> The SPRING WG defines procedures that allow a node to steer a packet
> through an
>
> SR Policy instantiated as an ordered list of instructions called segments
> and
>
> without the need for per-path state information to be held at transit
> nodes.
>
> Full explicit control (through loose or strict path specification) can be
>
> achieved in a network comprising only SPRING nodes, however SPRING nodes
> must
>
> inter-operate through loose routing in existing networks and may find it
>
> advantageous to use loose routing for other network applications.
>
>
>
> The scope of the SPRING WG work includes both single Autonomous System
> (AS) and
>
> multi-AS environments. Segment Routing operates within a trusted domain; =
as
>
> described in the architecture, a node imposing a segment list is assumed
> to be
>
> allowed to do so. Nonetheless, the SPRING WG must strive to identify and
>
> address security considerations brought up by the technologies it
> defines.  The
>
> technologies SPRING WG defines may be applicable to both centralised and
>
> distributed path computation.
>
>
>
> SPRING WG should avoid modification to existing data planes that would ma=
ke
>
> them incompatible with existing deployments. Where possible, existing
> control
>
> and management plane protocols must be used within existing architectures
> to
>
> implement the SPRING function. Any modification of - or extension to -
> existing
>
> architectures, data planes, or control or management plane protocols
> should be
>
> carried out in the WGs responsible for the architecture, data plane, or
> control
>
> or management plane protocol being modified and in coordination with the
> SPRING
>
> WG, but may be done in SPRING WG after agreement with all the relevant WG
>
> chairs and responsible Area Directors.
>
>
>
>
>
> The SPRING WG will manage its specific work items by milestones agreed
> with the
>
> responsible Area Director.
>
>
>
> The work-items of the SPRING WG include functional specifications for:
>
>
>
> o Segment Routing policies and the associated steering and traffic
> engineering
>
>   mechanisms.
>
>
>
> o Source-routed stateless service chaining using SR-MPLS and SRv6
> dataplanes.
>
>
>
> o SRv6 network programming for the underlay networks and overlay services=
,
> and
>
>   including data plane behavior and functions associated with SIDs
>
>
>
> o Operation, Administration and Management (OAM), and traffic accounting =
in
>
>   networks with SR-MPLS and SRv6 data planes in the case where SR
> introduces
>
>   specificities compared to MPLS or IPv6 technologies.
>
>
>
> o Performance Management (PM) and monitoring in networks with SR-MPLS and
> SRv6
>
>   data planes in the case where SR introduces specificities compared to
> MPLS or
>
>   IPv6 technologies.
>
>
>
> o The inter-working between SRv6 and SR-MPLS.
>
>
>
> o Using SR as the mechanism to identify sets of resources in networks wit=
h
>
>   SR-MPLS and SRv6 dataplanes.
>
>
>
> Any of the above may require architectural extensions.
>
>
>
> The work-items of SPRING WG also include:
>
>
>
> o Specification of management models (YANG) for Segment Routing
> applications,
>
>   services and networks with SR-MPLS and SRv6 dataplanes.
>
>
>
> The SPRING WG will coordinate and collaborate with other WGs as needed.
> Specific
>
> expected interactions include (but may not be limited to):
>
>
>
> * mpls on the MPLS dataplane and OAM extensions,
>
> * 6man on the IPv6 dataplane for SR and associated OAM extensions
>
> * lsr on OSPF and IS-IS extensions to flood SPRING-related information
>
>         * idr for BGP extensions
>
> * bess for VPN control plane
>
> * pce on extensions to communicate with an external entity to compute and
> program SPRING paths
>
> * teas on generic traffic engineering architecture
>
>
>
> Please comment on the contents of the charter text on the list.
>
>
>
> Thanks,
>
> Bruno & Rob
>
> _________________________________________________________________________=
________________________________________________
>
>
>
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>
>

--000000000000360c32056eec610b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Zafar,<div><br></div><div>I&#39;m not sure I agree with th=
is statement:</div><div><br></div><div><i>&gt;=C2=A0<span style=3D"color:rg=
b(33,33,33)">The new text is assuming a solution (as reasoned in my earlier=
 email, e.g., a (fully) controller-based solution will not require &quot;me=
chanism to identify sets of resources in networks&quot;).=C2=A0</span></i><=
/div><div><br></div><div>If the forwarding resource to be used is more gran=
ular than a link then we do not have a way that this can be exposed to a co=
ntroller today. Equally, in all practical deployments today, using Adj-SID =
stacks is not actually possible at a controller. The intention of this bull=
et was to cover such scenarios.</div><div><br></div><div>That said -- yes, =
we would like to be consistent in what should be added to the list here. Th=
is seems an open area that is of interest to folks in the WG; it does not l=
ook to be addressable with the current set of mechanisms that are defined i=
n the architecture; and does not appear to be outside of the general areas =
that we defined in the original charter. This was the bar we&#39;ve tried t=
o apply across work items. An analogue here would be the stateless service =
chaining bullet.</div><div><br></div><div>Note that this bullet is *not* a =
milestone. No milestones are in the text that I shared. The intention of th=
is list is to provide a focused set of things to work on within the next it=
eration of work within SPRING.</div><div><br></div><div>I encourage debate =
of the technical point around whether the existing mechanisms can achieve t=
he use cases that Jie is raising -- please fork the thread for this!</div><=
div><br></div><div>Thanks,</div><div>r.</div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr">On Mon, Jun 18, 2018 at 8:25 AM Zafar Ali (zali) &l=
t;zali=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ie=
tf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_-7229938392368063500WordSection1">
<p class=3D"MsoNormal">Hi Jie, <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks for your follow-up. <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I am ok with the text in the &quot;current&quot; Cha=
rter. That is because the &quot;current&quot; text does NOT assume a soluti=
on. By converting the current text<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Current Charter Text: Some types of network virtuali=
zation, including multi-topology networks and the partitioning of network r=
esources for VPNs.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">To <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">New WG work-item/ milestone: &quot;Using SR as the m=
echanism to identify sets of resources in networks with SR-MPLS and SRv6 da=
taplanes&quot;<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The new text is assuming a solution (as reasoned in =
my earlier email, e.g., a (fully) controller-based solution will not requir=
e &quot;mechanism to identify sets of resources in networks&quot;).=C2=A0
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I would suggest the following change:<u></u><u></u><=
/p>
<p class=3D"MsoNormal">&quot;Using SR as the mechanism for partitioning net=
work resources with SR-MPLS and SRv6 data planes.&quot;<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Secondly, the earlier the text was part of the chart=
er and not a milestone. Hence, my previous comment on the logic of adding t=
his task to the &quot;work items&quot; list still applies. And if we includ=
e this as a work-items, why did we drop a few
 items raised by many (before/ during IETF in London and as part of the rev=
iew of the charter draft) on the list for inclusion in the &quot;work items=
&quot; list. I am hoping for consistency in making such determination in th=
e final version of the charter.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Thanks<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Regards =E2=80=A6 Zafar <u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">&quot;Dongjie (Ji=
mmy)&quot; &lt;<a href=3D"mailto:jie.dong@huawei.com" target=3D"_blank">jie=
.dong@huawei.com</a>&gt;<br>
<b>Date: </b>Friday, June 15, 2018 at 11:13 AM<br>
<b>To: </b>&quot;Zafar Ali (zali)&quot; &lt;<a href=3D"mailto:zali@cisco.co=
m" target=3D"_blank">zali@cisco.com</a>&gt;, &quot;Zafar Ali (zali)&quot; &=
lt;zali=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">4=
0cisco.com@dmarc.ietf.org</a>&gt;, &quot;<a href=3D"mailto:bruno.decraene@o=
range.com" target=3D"_blank">bruno.decraene@orange.com</a>&quot; &lt;<a hre=
f=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@ora=
nge.com</a>&gt;<br>
<b>Cc: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;, Rob Shakir &lt;robjs=3D<a href=3D"mailto:4=
0google.com@dmarc.ietf.org" target=3D"_blank">40google.com@dmarc.ietf.org</=
a>&gt;<br>
<b>Subject: </b></span><span style=3D"font-size:12.0pt;font-family:&quot;MS=
 Gothic&quot;;color:black">=E7=AD=94=E5=A4=8D</span><span style=3D"font-siz=
e:12.0pt;color:black">: [spring] Updating the SPRING WG Charter<u></u><u></=
u></span></p>
</div></div></div><div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72"><d=
iv class=3D"m_-7229938392368063500WordSection1">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Hi Za=
far, </span>
<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">I=E2=
=80=99d like to remind you that in the current SPRING charter there is alre=
ady one work item as below:</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<pre style=3D"text-indent:4.5pt;background:white"><span style=3D"font-size:=
9.0pt;font-family:SimSun;color:black"> o=C2=A0=C2=A0=C2=A0 Some types of ne=
twork virtualization, including multi-</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-size:=
9.0pt;font-family:SimSun;color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
topology networks and the partitioning of network</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"background:white"><span style=3D"font-size:=
9.0pt;font-family:SimSun;color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
resources for VPNs</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">IMO t=
he work item you are referring to is not a new one, actually it is an updat=
e or rephrasing of the previous one. Thus it is not relevant to the logic o=
f adding new work items. The VPN+ drafts
 are just piece of work matching with this existing work item. </span><u></=
u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">I bel=
ieve there is consistent rules of adding new work items to the charter, and=
 it would be very helpful to concentrate on constructive discussion of thos=
e topics.
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Best =
regards,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Jie</=
span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:MingLiU">=E5=8F=91</sp=
an></b><b><span style=3D"font-family:&quot;MS Gothic&quot;">=E4=BB=B6=E4=BA=
=BA</span></b><b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=
=BB=91">:</span></b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=
=E9=BB=91"> Zafar Ali (zali) [mailto:<a href=3D"mailto:zali@cisco.com" targ=
et=3D"_blank">zali@cisco.com</a>]
<br>
</span><b><span style=3D"font-family:MingLiU">=E5=8F=91</span></b><b><span =
style=3D"font-family:&quot;MS Gothic&quot;">=E9=80=81</span></b><b><span st=
yle=3D"font-family:MingLiU">=E6=97=B6=E9=97=B4</span></b><b><span style=3D"=
font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91">:</span></b><span style=
=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91"> 2018</span><span sty=
le=3D"font-family:&quot;MS Gothic&quot;">=E5=B9=B4</span><span style=3D"fon=
t-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91">6</span><span style=3D"font-=
family:&quot;MS Gothic&quot;">=E6=9C=88</span><span style=3D"font-family:=
=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91">14</span><span style=3D"font-family:&=
quot;MS Gothic&quot;">=E6=97=A5</span><span style=3D"font-family:=E5=BE=AE=
=E8=BD=AF=E9=9B=85=E9=BB=91">
 19:44<br>
</span><b><span style=3D"font-family:&quot;MS Gothic&quot;">=E6=94=B6=E4=BB=
=B6=E4=BA=BA</span></b><b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=
=9B=85=E9=BB=91">:</span></b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=
=E9=9B=85=E9=BB=91"> Dongjie (Jimmy) &lt;<a href=3D"mailto:jie.dong@huawei.=
com" target=3D"_blank">jie.dong@huawei.com</a>&gt;; Zafar Ali (zali) &lt;za=
li=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisc=
o.com@dmarc.ietf.org</a>&gt;; <a href=3D"mailto:bruno.decraene@orange.com" =
target=3D"_blank">bruno.decraene@orange.com</a><br>
</span><b><span style=3D"font-family:&quot;MS Gothic&quot;">=E6=8A=84=E9=80=
=81</span></b><b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=
=BB=91">:</span></b><span style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=
=E9=BB=91"> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D=
"_blank">spring@ietf.org</a>&gt;; Rob Shakir &lt;robjs=3D<a href=3D"mailto:=
40google.com@dmarc.ietf.org" target=3D"_blank">40google.com@dmarc.ietf.org<=
/a>&gt;; Zafar Ali (zali) &lt;<a href=3D"mailto:zali@cisco.com" target=3D"_=
blank">zali@cisco.com</a>&gt;<br>
</span><b><span style=3D"font-family:&quot;MS Gothic&quot;">=E4=B8=BB</span=
></b><b><span style=3D"font-family:MingLiU">=E9=A2=98</span></b><b><span st=
yle=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91">:</span></b><span =
style=3D"font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91"> Re: [spring] Up=
dating the SPRING WG Charter</span><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Hi Jie, <u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">While I look forward to reviewing the draft, at the =
moment of writing the charter no such details were available. At the moment=
 we do not know if this would be an architecturally correct option to adopt=
 in segment routing; what type of
 complexity, statefulness and scalability concerns it brings to the table. =
We also don&#39;t know if this is a matter of local implementation or are w=
e better off if it is entirely done at the controller, etc.
<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">The work you are doing is already in the charter by =
the virtue of &quot;SPRING WG serves as a forum to discuss SPRING networks =
operations, define new applications, and specify extensions of Segment Rout=
ing technologies.&quot;
<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">What puzzles me is the logic of adding this task to =
the &quot;work items&quot; list. And if we go with the same logic, why did =
we drop a few items raised by many (before/ during IETF in London and as pa=
rt of the review of the charter draft) on the
 list for inclusion in the &quot;work items&quot; list. I am hoping for con=
sistency in making such determination in the final version of the charter.
<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">Thanks</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">Regards =E2=80=A6 Zafar
</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;<a hre=
f=3D"mailto:spring-bounces@ietf.org" target=3D"_blank">spring-bounces@ietf.=
org</a>&gt; on behalf of &quot;Dongjie (Jimmy)&quot; &lt;<a href=3D"mailto:=
jie.dong@huawei.com" target=3D"_blank">jie.dong@huawei.com</a>&gt;<br>
<b>Date: </b>Wednesday, June 13, 2018 at 11:26 PM<br>
<b>To: </b>&quot;Zafar Ali (zali)&quot; &lt;<a href=3D"mailto:zali=3D40cisc=
o.com@dmarc.ietf.org" target=3D"_blank">zali=3D40cisco.com@dmarc.ietf.org</=
a>&gt;, &quot;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank=
">bruno.decraene@orange.com</a>&quot; &lt;<a href=3D"mailto:bruno.decraene@=
orange.com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;<br>
<b>Cc: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;, &quot;Zafar Ali (zali)&quot; &lt;<a href=
=3D"mailto:zali@cisco.com" target=3D"_blank">zali@cisco.com</a>&gt;, Rob Sh=
akir &lt;<a href=3D"mailto:robjs=3D40google.com@dmarc.ietf.org" target=3D"_=
blank">robjs=3D40google.com@dmarc.ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [spring] Updating the SPRING WG Charter</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Hi Za=
far, </span>
<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">As me=
ntioned in my previous mail, the VPN+ drafts and this work item require new=
 functionality to be added to SR, which is to associate SR with particular =
allocated resources and treatment. IMO
 this is not covered by existing SR mechanisms. It is different from Diffse=
rv QoS, and it is not pure controller-based accounting, because in the data=
 plane some mechanism is needed to make sure different services will be tre=
ated accordingly and not impact
 each other. </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Thank=
s for the comments in London, we are working on the updates of the VPN+ dra=
fts, hopefully they will be published for open review soon.
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Best =
regards,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">Jie</=
span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;color:#1f497d">=C2=
=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring [<a href=3D"mailto:spring-bounce=
s@ietf.org" target=3D"_blank">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b>Zafar Ali (zali)<br>
<b>Sent:</b> Wednesday, June 13, 2018 11:30 PM<br>
<b>To:</b> <a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">b=
runo.decraene@orange.com</a>; Zafar Ali (zali) &lt;<a href=3D"mailto:zali=
=3D40cisco.com@dmarc.ietf.org" target=3D"_blank">zali=3D40cisco.com@dmarc.i=
etf.org</a>&gt;<br>
<b>Cc:</b> SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;; Zafar Ali (zali) &lt;<a href=3D"mailto:zal=
i@cisco.com" target=3D"_blank">zali@cisco.com</a>&gt;; Rob Shakir &lt;<a hr=
ef=3D"mailto:robjs=3D40google.com@dmarc.ietf.org" target=3D"_blank">robjs=
=3D40google.com@dmarc.ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter<u></u><u></u></=
p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Hi Bruno,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">I am aware of the VPN+ draft but IMO this document o=
r Slicing, in general, is an informational use-case document (E.g., similar=
ly SD-WAN does not have a milestone in the Charter). I do not think that th=
ere is any new behavior needed beyond
 SRTE, SRVPN, Flex-Algo, Diffserv QoS and SR SFC, etc. What is missing is t=
he controller doing the bandwidth (resource) accounting but this outside th=
e scope of IETF. Furthermore, the specifics in the VPN+ specifics draft aga=
inst this milestone are missing.
 The same comments were also raised when draft-dong-spring-sr-for-enhanced-=
vpn was presented to the Spring WG in London.
<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">Thanks</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif">Regards =E2=80=A6 Zafar
</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">&quot;<a href=3D"=
mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.c=
om</a>&quot; &lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_bl=
ank">bruno.decraene@orange.com</a>&gt;<br>
<b>Date: </b>Tuesday, June 12, 2018 at 12:13 PM<br>
<b>To: </b>&quot;Zafar Ali (zali)&quot; &lt;<a href=3D"mailto:zali=3D40cisc=
o.com@dmarc.ietf.org" target=3D"_blank">zali=3D40cisco.com@dmarc.ietf.org</=
a>&gt;<br>
<b>Cc: </b>&quot;Zafar Ali (zali)&quot; &lt;<a href=3D"mailto:zali@cisco.co=
m" target=3D"_blank">zali@cisco.com</a>&gt;, Rob Shakir &lt;<a href=3D"mail=
to:robjs=3D40google.com@dmarc.ietf.org" target=3D"_blank">robjs=3D40google.=
com@dmarc.ietf.org</a>&gt;, SPRING WG List &lt;<a href=3D"mailto:spring@iet=
f.org" target=3D"_blank">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>RE: [spring] Updating the SPRING WG Charter</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">Dear Zafar,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">Please see inline [Bruno]</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">=C2=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt;f=
ont-family:&quot;Tahoma&quot;,sans-serif"> spring [<a href=3D"mailto:spring=
-bounces@ietf.org" target=3D"_blank">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b>Zafar Ali (zali)<br>
<b>Sent:</b> Tuesday, June 12, 2018 3:45 PM<br>
<b>To:</b> Rob Shakir; SPRING WG List<br>
<b>Cc:</b> Zafar Ali (zali)<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter</span><u></u><u=
></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Dear Rob, Bruno, <u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">I have a question on the specifics of the following =
milestone:<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black">Using SR as the mechanism to =
identify sets of resources in networks with SR-MPLS and SRv6 dataplanes.<u>=
</u><u></u></li></ul>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">I do not know of any specific use-case, requirement =
or an individual draft associated with this milestone beyond what is alread=
y covered by other milestones (e.g., by =E2=80=9CSegment Routing policies a=
nd the associated steering and traffic engineering
 mechanisms=E2=80=9D). What specific deliverable you have in mind? Is there=
 an individual(s) draft against this milestone? Please advise.<u></u><u></u=
></p>
<p class=3D"MsoNormal"><span style=3D"color:black">=C2=A0</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">[Bruno] Would the following pointers prov=
ide enough context?
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black"><a href=3D"https://mailarchive.ietf.org/a=
rch/msg/spring/canXoxLZCwRZ_yFcV3U7RXRwfpM" target=3D"_blank">https://maila=
rchive.ietf.org/arch/msg/spring/canXoxLZCwRZ_yFcV3U7RXRwfpM</a></span><u></=
u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black"><a href=3D"https://tools.ietf.org/html/dr=
aft-bryant-rtgwg-enhanced-vpn-02#section-4.3.6" target=3D"_blank">https://t=
ools.ietf.org/html/draft-bryant-rtgwg-enhanced-vpn-02#section-4.3.6</a></sp=
an><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black"><a href=3D"https://tools.ietf.org/html/dr=
aft-dong-spring-sr-for-enhanced-vpn-00#section-2" target=3D"_blank">https:/=
/tools.ietf.org/html/draft-dong-spring-sr-for-enhanced-vpn-00#section-2</a>=
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">Regards,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif;color:black">--Bruno</span><u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">=C2=A0</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal">Thanks<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">Regards =E2=80=A6 Zafar <u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">spring &lt;<a hre=
f=3D"mailto:spring-bounces@ietf.org" target=3D"_blank">spring-bounces@ietf.=
org</a>&gt; on behalf of Rob Shakir &lt;<a href=3D"mailto:robjs=3D40google.=
com@dmarc.ietf.org" target=3D"_blank">robjs=3D40google.com@dmarc.ietf.org</=
a>&gt;<br>
<b>Date: </b>Friday, June 1, 2018 at 12:07 PM<br>
<b>To: </b>SPRING WG List &lt;<a href=3D"mailto:spring@ietf.org" target=3D"=
_blank">spring@ietf.org</a>&gt;<br>
<b>Subject: </b>[spring] Updating the SPRING WG Charter</span><u></u><u></u=
></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><a name=3D"m_-7229938392368063500__MailOriginalBody"=
>Hi SPRING, <u></u><u></u></a></p>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>After the discussions on the list and in Londo=
n relating to the charter, Bruno and I have been working to propose a new c=
harter for the WG with Martin, and the other routing ADs. The text for
 this suggested charter is below. We would like to solicit WG feedback on t=
he charter text prior to Martin taking to the IESG. We&#39;d like to try an=
d get the charter agreed prior to IETF 102 in Montr=C3=A9al.<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The Source Packet Routing in NetworkinG (SPRING) Working Group is the=
 home of</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG =
serves as</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">a forum to discuss SPRING networks operations, define new application=
s, and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">specify extensions of Segment Routing technologies.</span><u></u><u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The SPRING WG defines procedures that allow a node to steer a packet =
through an</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">SR Policy instantiated as an ordered list of instructions called segm=
ents and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">without the need for per-path state information to be held at transit=
 nodes.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">Full explicit control (through loose or strict path specification) ca=
n be</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">achieved in a network comprising only SPRING nodes, however SPRING no=
des must</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">inter-operate through loose routing in existing networks and may find=
 it</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">advantageous to use loose routing for other network applications.</sp=
an><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The scope of the SPRING WG work includes both single Autonomous Syste=
m (AS) and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">multi-AS environments. Segment Routing operates within a trusted doma=
in; as</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">described in the architecture, a node imposing a segment list is assu=
med to be</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">allowed to do so. Nonetheless, the SPRING WG must strive to identify =
and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">address security considerations brought up by the technologies it def=
ines.=C2=A0 The</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">technologies SPRING WG defines may be applicable to both centralised =
and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">distributed path computation.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">SPRING WG should avoid modification to existing data planes that woul=
d make</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">them incompatible with existing deployments. Where possible, existing=
 control</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">and management plane protocols must be used within existing architect=
ures to</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">implement the SPRING function. Any modification of - or extension to =
- existing</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">architectures, data planes, or control or management plane protocols =
should be</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">carried out in the WGs responsible for the architecture, data plane, =
or control</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">or management plane protocol being modified and in coordination with =
the SPRING</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">WG, but may be done in SPRING WG after agreement with all the relevan=
t WG</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">chairs and responsible Area Directors.</span><u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The SPRING WG will manage its specific work items by milestones agree=
d with the</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">responsible Area Director.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The work-items of the SPRING WG include functional specifications for=
:</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Segment Routing policies and the associated steering and traffic en=
gineering</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 mechanisms.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Source-routed stateless service chaining using SR-MPLS and SRv6 dat=
aplanes.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o SRv6 network programming for the underlay networks and overlay serv=
ices, and</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 including data plane behavior and functions associated with SI=
Ds</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Operation, Administration and Management (OAM), and traffic account=
ing in</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 networks with SR-MPLS and SRv6 data planes in the case where S=
R introduces</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 specificities compared to MPLS or IPv6 technologies.</span><u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Performance Management (PM) and monitoring in networks with SR-MPLS=
 and SRv6</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 data planes in the case where SR introduces specificities comp=
ared to MPLS or</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 IPv6 technologies.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o The inter-working between SRv6 and SR-MPLS.</span><u></u><u></u></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Using SR as the mechanism to identify sets of resources in networks=
 with</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 SR-MPLS and SRv6 dataplanes.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">Any of the above may require architectural extensions.</span><u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The work-items of SPRING WG also include:</span><u></u><u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">o Specification of management models (YANG) for Segment Routing appli=
cations,</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 services and networks with SR-MPLS and SRv6 dataplanes.</span>=
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">The SPRING WG will coordinate and collaborate with other WGs as neede=
d. Specific</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">expected interactions include (but may not be limited to):</span><u><=
/u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* mpls on the MPLS dataplane and OAM extensions,</span><u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* 6man on the IPv6 dataplane for SR and associated OAM extensions</sp=
an><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* lsr on OSPF and IS-IS extensions to flood SPRING-related informatio=
n</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">=C2=A0 =C2=A0 =C2=A0 =C2=A0 * idr for BGP extensions</span><u></u><u>=
</u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* bess for VPN control plane</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* pce on extensions to communicate with an external entity to compute=
 and program SPRING paths</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span><span style=3D"font-family:&quot;Courier New&q=
uot;">* teas on generic traffic engineering architecture</span><u></u><u></=
u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span>Please comment on the contents of the charter =
text on the list.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Thanks,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Bruno &amp; Rob<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">______________________________________________________________________=
___________________________________________________</span><u></u><u></u></s=
pan></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">=C2=A0</span><u></u><u></u></span></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc</span><u></u><u></u></span>=
</pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler</span><u></u><u></u></spa=
n></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les me=
ssages electroniques etant susceptibles d&#39;alteration,</span><u></u><u><=
/u></span></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.</span><u></u><u></u></span></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">=C2=A0</span><u></u><u></u></span></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">This message and its attachments may contain confidential or privilege=
d information that may be protected by law;</span><u></u><u></u></span></pr=
e>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
ot;">they should not be distributed, used or copied without authorisation.<=
/span><u></u><u></u></span></pre>
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ot;">If you have received this email in error, please notify the sender and=
 delete this message and its attachments.</span><u></u><u></u></span></pre>
<pre><span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&qu=
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been modified, changed or falsified.</span><u></u><u></u></span></pre>
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ot;">Thank you.</span><u></u><u></u></span></pre>
</div>
</div>
</div></div></blockquote></div>

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Hi all,

A quick update on the status of this WGLC:

- WGLC has ended.
- All the authors have responded about IPR (thank you!). Still missing repl=
ies from some contributors (Wim, Edward, Igor, Saku). I sending another rem=
inder today.
- Six non authors (Zafar, Adrian, Xiaohu, Chris, Pk, Ruediger) have respond=
ed supporting publication.
- No opposition.
- Six persons have sent comments (Adrian, Chris, pk, Ruediger, Sasha, mysel=
f). Thank you.
- Authors have addressed Adrian's comments. Please engage resolution with t=
he five remaining reviewers.

I'll wait on:
- contributors to replies to IPR
- authors to reply to reviewers

Then next step would be:
- Shepherd report (Shraddha)
- AD decision (Martin)
- Submission to IESG

Thank you,
--Bruno


From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
Sent: Thursday, June 07, 2018 6:52 PM
To: SPRING WG List
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: RE: WG Last Call for draft-ietf-spring-segment-routing-mpls-13

Hi all,

A quick update on the status of this WGLC:

- All the authors have responded about IPR (thank you!). Still missing repl=
ies from some contributors (Wim, Edward, Igor, Saku). I've sent them a remi=
nder this Monday.
- Two people (Zafar, Adrian) have responded supporting publication.
- No opposition.
- Two persons have sent comments (Adrian, myself). Thanks Adrian.
- Authors have not replied to any comment so far.
- The WGLC period was scheduled to end tomorrow.

I wish we had more support, reviews, and authors' involvement to reply to r=
eviews.

The WGLC is extended by a week. Please review the document and send your co=
mments to the list, no later than *June 15*

Thank you,
--Bruno

From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]
Sent: Thursday, May 24, 2018 7:14 PM
To: SPRING WG List
Cc: draft-ietf-spring-segment-routing-mpls@ietf.org
Subject: WG Last Call for draft-ietf-spring-segment-routing-mpls-13


Hello Working Group,



This email starts a Working Group Last Call on draft-ietf-spring-segment-ro=
uting-mpls-13 [1] which is considered mature and ready for a final working =
group review.



Please read this document if you haven't read the most recent version yet, =
and send your comments to the list, no later than *June 08*.



As a reminder, this document had already passed a WGLC more than a year ago=
 on version -06 [2], had been sent to the AD but then returned to the WG.

Since then, the document has significantly changed, so please read it again=
. In particular, it now includes the resolution in case of incoming label c=
ollision. Hence it killed draft-ietf-spring-conflict-resolution.



Both co-chairs co-author this document, hence:

- Shraddha has agreed to be the document shepherd. Thank you Shraddha.

- Martin, our AD, has agreed to evaluate the WG consensus.



Thank you,

Bruno, Rob



[1] https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-13

[2] https://mailarchive.ietf.org/arch/msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y



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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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This message and its attachments may contain confidential or privileged inf=
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Thank you.

___________________________________________________________________________=
______________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
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they should not be distributed, used or copied without authorisation.
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Hi all,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">A quick update=
 on the status of this WGLC:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- WGLC has end=
ed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- All the auth=
ors have responded about IPR (thank you!). Still missing replies from some =
contributors (Wim, Edward, Igor, Saku). I sending another
 reminder today.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Six non auth=
ors (Zafar, Adrian, Xiaohu, Chris, Pk, Ruediger) have responded supporting =
publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- No oppositio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Six persons =
have sent comments (Adrian, Chris, pk, Ruediger, Sasha, myself). Thank you.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Authors have=
 addressed Adrian&#8217;s comments. Please engage resolution with the five =
remaining reviewers.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">I&#8217;ll wai=
t on:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- contributors=
 to replies to IPR<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- authors to r=
eply to reviewers<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Then next step=
 would be:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Shepherd rep=
ort (Shraddha)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- AD decision =
(Martin)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Submission t=
o IESG<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Thank you,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">--Bruno<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-language:FR">From:</span><=
/b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;san=
s-serif&quot;;mso-fareast-language:FR"> bruno.decraene@orange.com [mailto:b=
runo.decraene@orange.com]
<br>
<b>Sent:</b> Thursday, June 07, 2018 6:52 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Cc:</b> draft-ietf-spring-segment-routing-mpls@ietf.org<br>
<b>Subject:</b> RE: WG Last Call for draft-ietf-spring-segment-routing-mpls=
-13<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black">Hi all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">A quick update=
 on the status of this WGLC:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- All the auth=
ors have responded about IPR (thank you!). Still missing replies from some =
contributors (Wim, Edward, Igor, Saku). I&#8217;ve sent them a reminder
 this Monday.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Two people (=
Zafar, Adrian) have responded supporting publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- No oppositio=
n.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Two persons =
have sent comments (Adrian, myself). Thanks Adrian.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- Authors have=
 not replied to any comment so far.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">- The WGLC per=
iod was scheduled to end tomorrow.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">I wish we had =
more support, reviews, and authors&#8217; involvement to reply to reviews.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">The WGLC is ex=
tended by a week. Please review the document and send your comments to the =
list, no later than *<b>June 15</b>*<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Thank you,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">--Bruno<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-language:FR">From:</span><=
/b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;san=
s-serif&quot;;mso-fareast-language:FR"> bruno.decraene@orange.com [mailto:b=
runo.decraene@orange.com]
<br>
<b>Sent:</b> Thursday, May 24, 2018 7:14 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Cc:</b> draft-ietf-spring-segment-routing-mpls@ietf.org<br>
<b>Subject:</b> WG Last Call for draft-ietf-spring-segment-routing-mpls-13<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span lang=3D"EN-US">Hello Working Group,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">This email starts a Working Group Last Call on dr=
aft-ietf-spring-segment-routing-mpls-13 [1] which is considered mature and =
ready for a final working group review.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Please read this document if you haven't read the=
 most recent version yet, and send your comments to the list, no later than=
 *June 08*.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">As a reminder, this document had already passed a=
 WGLC more than a year ago on version -06 [2], had been sent to the AD but =
then returned to the WG.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Since then, the document has significantly change=
d, so please read it again. In particular, it now includes the resolution i=
n case of incoming label collision. Hence it killed draft-ietf-spring-confl=
ict-resolution.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Both co-chairs co-author this document, hence:<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Shraddha has agreed to be the document shepherd=
. Thank you Shraddha.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">- Martin, our AD, has agreed to evaluate the WG c=
onsensus.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp; <o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Thank you,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">Bruno, Rob<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">[1] <a href=3D"https://tools.ietf.org/html/draft-=
ietf-spring-segment-routing-mpls-13">https://tools.ietf.org/html/draft-ietf=
-spring-segment-routing-mpls-13</a><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">[2] <a href=3D"https://mailarchive.ietf.org/arch/=
msg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y">https://mailarchive.ietf.org/arch/m=
sg/spring/STiYsQJWuVXA1C9hK4BiUnyMu7Y</a><o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-family:&quot;Arial&quot;,&quot;sans=
-serif&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre>______________________________________________________________________=
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<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
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<pre><o:p>&nbsp;</o:p></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>
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<pre>______________________________________________________________________=
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<pre><o:p>&nbsp;</o:p></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<o:p></o:p></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
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<pre>This message and its attachments may contain confidential or privilege=
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<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
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This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, DECRAENE Bruno IMT/OLN <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>, "draft-ietf-spring-segment-routing-mpls@ietf.org" <draft-ietf-spring-segment-routing-mpls@ietf.org>
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To: "Voyer, Daniel" <daniel.voyer@bell.ca>
CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Linda Dunbar <linda.dunbar@huawei.com>
CC: Jeff Tantsura <jefftant.ietf@gmail.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: msg to SPRING to promote SR -SD WAN draft RE: [spring] Updating the SPRING WG Charter
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Date: Mon, 18 Jun 2018 19:58:35 +0000
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Subject: [spring] msg to SPRING to promote SR -SD WAN draft RE: Updating the SPRING WG Charter
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From: "Voyer, Daniel" <daniel.voyer@bell.ca>
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CC: Xiejingrong <xiejingrong@huawei.com>, "spring@ietf.org" <spring@ietf.org>,  "Zafar Ali (zali)" <zali@cisco.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Michael McBride <Michael.McBride@huawei.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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--_000_97583093809942ECBBE8B8B663A5F2E3bellca_--


From nobody Mon Jun 18 14:38:57 2018
Return-Path: <zali@cisco.com>
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To: Rob Shakir <robjs@google.com>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>
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Date: Mon, 18 Jun 2018 21:38:45 +0000
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From: Gaurav Dawra <gdawra.ietf@gmail.com>
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Date: Mon, 18 Jun 2018 17:13:30 -0700
Cc: Martin Stiemerling <mls.ietf@gmail.com>, tsv-art@ietf.org, SPRING WG <spring@ietf.org>, =?utf-8?Q?Mirja_K=C3=BChlewind?= <ietf@kuehlewind.net>
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To: Alvaro Retana <aretana.ietf@gmail.com>
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Subject: Re: [spring] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08
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Hi Alvaro, Mirja=20

Any feedback or next steps to close this?

Cheers,

Gaurav

Sent from my iPhone

> On Jun 12, 2018, at 7:06 AM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
>=20
> Hi Mirja,
>=20
> Friendly Reminder...Could you please also advice if there is anything furt=
her to DISCUSS on this document which was also related to TCP updates below?=

>=20
> Cheers,
>=20
> Gaurav
>=20
>> On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana <aretana.ietf@gmail.com> wr=
ote:
>> Thanks Martin!
>>=20
>>> On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com) w=
rote:
>>>=20
>>> Hi Alvaro, all,=20
>>>=20
>>> Thanks for addressing my concerns.=20
>>>=20
>>> This version is good to go from my side.=20
>>>=20
>>> Kind regards,=20
>>>=20
>>> ;Martin=20
>>>=20
>>> Am 30.05.18 um 21:55 schrieb Alvaro Retana:=20
>>> > Martin:=20
>>> > br/>> Hi!!  How are you?=20
>>> > br/>> Gaurav just posted a revision.  Please takke a look and let us k=
now if br/>> the changes address your concerrns or not.=20
>>> > br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-segment-r=
outing-msdc-09=20
>>> > br/>> Thanks!!!=20
>>> > br/>> Alvaro. <=20
>>> > br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@gmail=
.com br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:=20
>>> > br/>>> Hi Martin, <=20
>>> >>=20
>>> >> Thanks for review. I will post the new version. Hopefully, it will br=
/>>> address all your comments and we can close thhis review.=20
>>> >>=20
>>> >> Any updates on below response?=20
>>> >>=20
>>> >> Cheers,=20
>>> >>=20
>>> >> Gaurav=20
>>> >>=20
>>> >> Sent from my iPhone=20
>>> >>=20
>>> >> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com br/>=
>> <mailto:gdawra.ietf@@gmail.com>> wrote:=20
>>> >>=20
>>> >>> Hi Martin,=20
>>> >>>=20
>>> >>> Thanks for the review. Any further comments here ? I will post the b=
r/>>>> new version soon. <=20
>>> >>>=20
>>> >>> Cheers,=20
>>> >>>=20
>>> >>> Gaurav=20
>>> >>>=20
>>> >>> Sent from my iPhone=20
>>> >>>=20
>>> >>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com br/=
>>>> <mailto:gdawra.ietf@@gmail.com>> wrote:=20
>>> >>>=20
>>> >>>> Hi Martin,=20
>>> >>>>=20
>>> >>>> Apologies from my end we had few internal authors conversations on b=
r/>>>>> the points you have raised. <=20
>>> >>>>=20
>>> >>>> Please find below my response. I will be happy to discuss further, b=
r/>>>>> if needed. <=20
>>> >>>>=20
>>> >>>> <Gaurav> inline...=20
>>> >>>>=20
>>> >>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com=
 br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:=20
>>> >>>>>=20
>>> >>>>> Hi Gaurav,=20
>>> >>>>>=20
>>> >>>>> This got lost on my end, sorry for this. The filter just moved br/=
>>>>>> these messages out of my sight... :-/=20
>>> >>>>>=20
>>> >>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:=20
>>> >>>>>> Hey Martin,=20
>>> >>>>>> Sorry for late reply. Please see some comments inline[Gaurav]=20
>>> >>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>> <mls.=
ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:mls.ietf@gm=
ail.com>> wrote:=20
>>> >>>>>>>=20
>>> >>>>>>> Hi all,=20
>>> >>>>>>>=20
>>> >>>>>>> I've reviewed this document as part of the transport area review=
 br/>>>>>>>> team's ongoing effort to review key IETF documents. These br/>>=
>&gtt;>>>> comments were written primarily for the transport area directors,=
 br/>>>>>>>> but are copied to the doocument's authors for their information=
 br/>>>>>>>&> and to allow them to address any issues raised. When done at t=
he=20
>>> >>>>>>> time of IETF Last Call, the authors should consider this review b=
r/>>>>>>>> together with any other last-call comments they receive. Please b=
r/>>>&>>>>> always CC tsv-art@=E2=80=A6 if you reply to or forward this revi=
ew.=20
>>> >>>>>>>=20
>>> >>>>>>> Summary:=20
>>> >>>>>>> This draft has serious issues in Section 7.1, 7.2 and in one par=
t br/>>>>>>>> of Secction3, described in the review, and needs to be rethoug=
ht. br/>>&>>>>>> The other sections are good AFAIK.=20
>>> >>>>>>>=20
>>> >>>>>>>=20
>>> >>>>>>> Technicals:=20
>>> >>>>>>> The overall draft looks ok, but the three points below look br/>=
>>>>>>> strange and need a fix before publication IMHO:=20
>>> >>>>>>>=20
>>> >>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well=
 br/>>>>>>>> proven funcationality and not even safe to use functionality. b=
r/>>>&>>>>> Both are some sort discussing that different paths in the networ=
k br/>>>>>>>> could be used by the eend host traffic. This sounds pretty muc=
h br/>>>>>>&gtt;> like the Path Aware Networking Proposed Research Group br/=
>&gtt;>>>>>> (https://irtf.org/panrg) and hints to the fact that there is no=
 br/>>>>>>>> commonly understannd and accepted engineering solution in this s=
pace.=20
>>> >>>>>>>=20
>>> >>>>>>> Section 7.1:=20
>>> >>>>>>> [KANDULA04] is a really old reference that hasn't been followed b=
r/>>>>>>>> up iin recent times and even worse there is no evidence that this=
 br/>&gtt;>>>>>> is going to work good enough or stable enough under real In=
ternet br/>>>>>>>> traffic. Additioonally, it is more than unclear how any m=
odern TCP br/>>>>&ggt;>>> implementation will react to this=20
>>> >>>>>> [Gaurav] Will get back on this.=20
>>> >>>>>=20
>>> >>>>> I will reply to the other email dicussing this.=20
>>> >>>> <Gaurav> I have replied to other thread.=20
>>> >>>>>=20
>>> >>>>>>>=20
>>> >>>>>>> Section 7.2:=20
>>> >>>>>>> This section describes an idea without detailing too much about b=
r/>>>>>>>> any furtther aspects. Further it changes the commonly accepted br=
/>>>;>>>>> notion of what an end host can do with the network. At best this b=
r/>>>>>>>> would require a good ddefinition of what an end host in your br/>=
>>>>>>&ggt; setting is, e.g., a highly modified piece of (at least) software=
=20
>>> >>>>>>> that usually not found in OS availble on the market (yet?)=20
>>> >>>>>>> Further communicating instantaneous path characteristics to a br=
/>>>>>>>> central point is potentially a bad idea, as the data is already br=
/>>>;>>>>> outdated when reported by any node.=20
>>> >>>>>> [Gaurav] I believe Authors are trying to highlight that Host whic=
h br/>>>>>>> is defineed in br/>>>>>>> (https://tools.ietf.org/html/draftt-i=
etf-spring-segment-routing-15) br/>>>>>>> can innfluence the traffic based o=
n the Calculations locally or br/>>&gtt;>>>> jointly with the controller. Im=
plementations can decide how much br/>>>>>>> Centralized -vs- localized coon=
trol is allowed at Host based on br/>>>>>>> perfoormance data collection.=20=

>>> >>>>>=20
>>> >>>>> Performance data collection (monitoring?) isn't crucial when it br=
/>>>>>> comes to timely (actuaally real-time) reaction. However, this br/>>>=
>>> secttion isn't just about performance data collection as it is about br/=
>>>>>>> "Performance-aware routing" this seems to try to interact in br/>>>>=
>> real-time with the network behhavior of TCP. This isn't even close br/>>>=
>>> to acceeptable.=20
>>> >>>>>=20
>>> >>>>> I would be ok to say that it is useful to collect performance data=
 br/>>>>>> for offline analysis and improvement of the data network. However=
, br/>>>>>&ggt; this is at completely different magnitues of time scales.=20=

>>> >>>>>=20
>>> >>>>> I would recommend to remove the TCP part from this section entirel=
y.=20
>>> >>>> <Gaurav>Ack, will update in next rev:=20
>>> >>>>=20
>>> >>>> Section will read like this:=20
>>> >>>>=20
>>> >>>> ;=20
>>> >>>> /Knowing the path associated with flows/packets, the end host may/=20=

>>> >>>> /deduce certain characteristics of the path on its own, and/=20
>>> >>>> /additionally use the information supplied with path information/=20=

>>> >>>> /pushed from the controller or received via pull request. The host/=
=20
>>> >>>> /may further share its path observations with the centralized agent=
,/=20
>>> >>>> /so that the latter may keep up-to-date network health map to assis=
t/=20
>>> >>>> /other hosts with this information./=20
>>> >>>> //=20
>>> >>>> /For example, an application A.1 at HostA may pin a flow destined/=20=

>>> >>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. Th=
e/=20
>>> >>>> /application A.1 may collect information on packet loss, deduced fr=
om/ =20
>>> >>>> /Other offline mechanisms. [There are some pingMesh mechanisms whic=
h /=20
>>> >>>> /Can be used here]/=20
>>> >>>> /Through these mechanisms information to a centralized agent, e.g./=
=20
>>> >>>> /after a flow completes, or periodically for longer lived flows./=20=

>>> >>>> /Next, using both local and/or global performance data, application=
/=20
>>> >>>> /A.1 as well as other applications sharing the same resources in th=
e/=20
>>> >>>> /DC fabric may pick up the best path for the new flow, or update an=
/=20
>>> >>>> /existing path (e.g.: when informed of congestion on an existing/=20=

>>> >>>> /path)./=20
>>> >>>> ;=20
>>> >>>>=20
>>> >>>>>=20
>>> >>>>>=20
>>> >>>>>>>=20
>>> >>>>>>> Section 3, 3rd bullet point:=20
>>> >>>>>>> It is the foundation of TCP that the network is regarded as a br=
/>>>>>>>> black box and that you infer from the transmission of packets br/>=
>>>;>>>> what the current state of the network path is. Inferring network br=
/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as br/>=
>>>>>>>; this would required that all paths exhibit this and if not what br/=
/>>>>>>>> is going to happen?=20
>>> >>>>>>> It could be an interesting research field to change many points b=
r/>>>>>>>> in TCP'ss behavior, but this once again points to the fact that b=
r/>>>&>>>>> this not the IETF works but IRTF or elsewhere.=20
>>> >>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightl=
y br/>>>>>>> treating Network as Black Box. Authors are implying per path br=
/>>>>;>>> performance metrics as not cached. Is there some change in text br=
/>>>>>>> you are suggesting??=20
>>> >>>>>=20
>>> >>>>>=20
>>> >>>>> I would recommend to remove the 3rd bullet point completey. TCP br=
/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is br/>>>>>=
> something the network could decide, e.g., rerouting TCP flows br/>&ggt;>>>=
> within the network or changing the forwarding path in the network br/>>>>>=
> for particular flows (if it is not routed).=20
>>> >>>>=20
>>> >>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd b=
r/>>>>> bullet point. Willl update in next rev - coming shortly.=20
>>> >>>>=20
>>> >>>>>=20
>>> >>>>> Kind regards,=20
>>> >>>>>=20
>>> >>>>>  Martin=20
>>> >>>>>=20
>>> >>>>=20
>=20

--Apple-Mail-0394868E-2976-461A-8E27-9D21FB7DA906
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi Alvaro, Mirja&nbsp;<div><br></div><div>A=
ny feedback or next steps to close this?</div><div><br></div><div>Cheers,</d=
iv><div><br></div><div>Gaurav<br><br><div id=3D"AppleMailSignature">Sent fro=
m my iPhone</div><div><br>On Jun 12, 2018, at 7:06 AM, Gaurav Dawra &lt;<a h=
ref=3D"mailto:gdawra.ietf@gmail.com">gdawra.ietf@gmail.com</a>&gt; wrote:<br=
><br></div><blockquote type=3D"cite"><div><div dir=3D"ltr">Hi Mirja,<div><br=
></div><div>Friendly Reminder...Could you please also advice if there is any=
thing further to DISCUSS on this document which was also related to TCP upda=
tes below?</div><div><br></div><div>Cheers,</div><div><br></div><div>Gaurav<=
/div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Jun 7=
, 2018 at 9:02 AM, Alvaro Retana <span dir=3D"ltr">&lt;<a href=3D"mailto:are=
tana.ietf@gmail.com" target=3D"_blank">aretana.ietf@gmail.com</a>&gt;</span>=
 wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex"> <p style=3D"margin:0.0px 0.0px 0.0=
px 0.0px"><font face=3D"Helvetica" size=3D"4" style=3D"font:13.0px Helvetica=
">Thanks Martin!</font></p><span class=3D"">
 <br><p class=3D"m_7352406945680739771airmail_on">On June 6, 2018 at 3:14:45=
 PM, Martin Stiemerling (<a href=3D"mailto:mls.ietf@gmail.com" target=3D"_bl=
ank">mls.ietf@gmail.com</a>) wrote:</p> </span><blockquote type=3D"cite" cla=
ss=3D"m_7352406945680739771clean_bq"><span><div><div></div><div><span class=3D=
"">Hi Alvaro, all,

<br>

<br>Thanks for addressing my concerns.

<br>

<br>This version is good to go from my side.

<br>

<br>Kind regards,

<br>

<br>   ;Martin

<br>

<br>Am 30.05.18 um 21:55 schrieb Alvaro Retana:

<br>&gt; Martin:

<br></span>&gt; =20
br/&gt;&gt; Hi!!&nbsp; How are you?

<br>&gt; =20
br/&gt;&gt; Gaurav just posted a revision.&nbsp; Please takke a look and let=
 us know if =20
br/&gt;&gt; the changes address your concerrns or not.

<br>&gt; =20
br/&gt;&gt; <a href=3D"https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-sprin=
g-segment-routing-msdc-09" target=3D"_blank">https://www.ietf.org/rfcdiff??<=
wbr>url2=3Ddraft-ietf-spring-<wbr>segment-routing-msdc-09</a>

<br>&gt; =20
br/&gt;&gt; Thanks!!!

<br>&gt; =20
br/&gt;&gt; Alvaro.
&lt;
<br>&gt; =20
br/&gt;&gt; On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((<a href=3D"mailto=
:gdawra.ietf@gmail.com" target=3D"_blank">gdawra.ietf@gmail.com</a> =20
br/&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_blank">gda=
wra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail.com</a><w=
br>&gt;) wrote:

<br>&gt; =20
br/&gt;&gt;&gt; Hi Martin,
&lt;
<br>&gt;&gt;

<br>&gt;&gt; Thanks for review. I will post the new version. Hopefully, it w=
ill =20
br/&gt;&gt;&gt; address all your comments and we can close thhis review.

<br><span class=3D"">&gt;&gt;

<br>&gt;&gt; Any updates on below response?

<br>&gt;&gt;

<br>&gt;&gt; Cheers,

<br>&gt;&gt;

<br>&gt;&gt; Gaurav

<br>&gt;&gt;

<br>&gt;&gt; Sent from my iPhone

<br>&gt;&gt;

<br></span><span class=3D"">&gt;&gt; On May 23, 2018, at 4:17 AM, Gaurav Daw=
ra &lt;<a href=3D"mailto:gdawra.ietf@gmail.com" target=3D"_blank">gdawra.iet=
f@gmail.com</a> =20
br/&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_blank"=
>gdawra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail.com</=
a><wbr>&gt;&gt; wrote:

<br>&gt;&gt;

<br>&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;

<br></span>&gt;&gt;&gt; Thanks for the review. Any further comments here ? I=
 will post the =20
br/&gt;&gt;&gt;&gt; new version soon.
&lt;
<br><span class=3D"">&gt;&gt;&gt;

<br>&gt;&gt;&gt; Cheers,

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Gaurav

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt; Sent from my iPhone

<br>&gt;&gt;&gt;

<br></span><span class=3D"">&gt;&gt;&gt; On May 16, 2018, at 7:44 PM, Gaurav=
 Dawra &lt;<a href=3D"mailto:gdawra.ietf@gmail.com" target=3D"_blank">gdawra=
.ietf@gmail.com</a> =20
br/&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:gdawra.ietf@" target=3D"_bl=
ank">gdawra.ietf@</a>@<a href=3D"http://gmail.com" target=3D"_blank">gmail.c=
om</a><wbr>&gt;&gt; wrote:

<br>&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Hi Martin,

<br>&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt; Apologies from my end we had few internal author=
s conversations on =20
br/&gt;&gt;&gt;&gt;&gt; the points you have raised.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Please find below my response. I will be happy to discu=
ss further, =20
br/&gt;&gt;&gt;&gt;&gt; if needed.
&lt;
<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; inline...

<br><span class=3D"">&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; On Apr 9, 2018, at 7:58 AM, Martin Stiemerling &lt;=
<a href=3D"mailto:mls.ietf@gmail.com" target=3D"_blank">mls.ietf@gmail.com</=
a> =20
br/&gt;&gt;&gt;&gt;&gt;&gt; &lt;mailto:<a href=3D"mailto:mls.iietf@gmail.com=
" target=3D"_blank">mls.iietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Hi Gaurav,

<br>&gt;&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt;&gt; This got lost on my end, sorry for this. The=
 filter just moved =20
br/&gt;&gt;&gt;&gt;&gt;&gt; these messages out of my  sight... :-/

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Am 15.02.18 um 05:47 schrieb Gaurav Dawra:

<br>&gt;&gt;&gt;&gt;&gt;&gt; Hey Martin,

<br>&gt;&gt;&gt;&gt;&gt;&gt; Sorry for late reply. Please see some comments i=
nline[Gaurav]

<br></span><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt;&gt; On Jan 9, 2018, at 2=
:25 PM, Martin Stiemerling =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; &lt;mls.ietf@@<a href=3D"http://gmail.co=
m" target=3D"_blank">gmail.com</a> &lt;mailto:<a href=3D"mailto:mls.ietf@gma=
il.com" target=3D"_blank">mls.ietf@gmail.com</a>&gt; =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; &lt;mailto:<a href=3D"mailto:mls.ietf@g=
mail.com" target=3D"_blank">mls.ietf@gmail.com</a>&gt;&gt; wrote:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Hi all,

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; I've reviewed this document as part o=
f the transport area review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; team's  ongoing effort to review key IET=
F documents. These =20
br/&gt;&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; comments were written primarily for=
 the transport area directors, =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; but are copied to the doocument's author=
s for their information =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;&gt; and to allow them to address any is=
sues raised. When done at the =20
<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; time of IETF Last Call, the authors should c=
onsider this review =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; together  with any other last-call comme=
nts they receive. Please =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; always CC tsv-art@=E2=80=A6 if you r=
eply to or forward this review.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Summary:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This draft has serious issues in Section 7.=
1, 7.2 and in one part =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; of Secction3, described in the review, a=
nd needs to be rethought. =20
br/&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt;&gt; The other sections are good AFAIK.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Technicals:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; The overall draft looks ok, but the three p=
oints below look =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; strange and  need a fix before publicati=
on IMHO:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Both Sections, 7.1. and 7.2., are describin=
g ideas, but not well =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; proven  funcationality and not even safe=
 to use functionality. =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; Both are some sort discussing that d=
ifferent paths in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; could be used by the eend host traffic. T=
his sounds pretty much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&amp;gtt;&gt; like the Path Aware Networking Prop=
osed Research Group =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://irtf.org/panrg"=
 target=3D"_blank">https://irtf.org/panrg</a>) and hints to the fact that th=
ere is no =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; commonly understannd and accepted engine=
ering solution in this space.

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.1:

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; [KANDULA04] is a really old reference that h=
asn't been followed =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; up iin recent times and even worse there=
 is no evidence that this =20
br/&gt;&amp;gtt;&gt;&gt;&gt;&gt;&gt;&gt; is going to work good enough or sta=
ble enough under real Internet =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; traffic. Additioonally, it is more than u=
nclear how any modern TCP =20
br/&gt;&gt;&gt;&gt;&amp;ggt;&gt;&gt;&gt; implementation will react to this

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Will get back on this=
.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I will reply to the other email dicussing this.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; I have replied to other thread.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 7.2:

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; This section describes an idea witho=
ut detailing too much about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; any furtther aspects. Further it changes=
 the commonly accepted =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; notion of what an end host can do with t=
he network. At best this =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; would require a good ddefinition of what=
 an end host in your =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&amp;ggt; setting is, e.g., a highly modified=
 piece of (at least) software =20
<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;&gt;&gt; that usually not found in O=
S availble on the market (yet?)

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Further communicating instantaneous p=
ath characteristics to a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; central  point is potentially a bad idea=
, as the data is already =20
br/&gt;&gt;&gt;;&gt;&gt;&gt;&gt;&gt; outdated when reported by any node.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] I believe Authors are trying to highli=
ght that Host which =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; is defineed in =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; (<a href=3D"https://tools.ietf.org/html/draf=
tt-ietf-spring-segment-routing-15" target=3D"_blank">https://tools.ietf.org/=
html/<wbr>draftt-ietf-spring-segment-<wbr>routing-15</a>) =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; can innfluence the traffic based on the Calc=
ulations locally or =20
br/&gt;&gt;&amp;gtt;&gt;&gt;&gt;&gt; jointly with the controller. Implementa=
tions can decide how much =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; Centralized -vs- localized coontrol is allow=
ed at Host based on =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; perfoormance data collection.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Performance data collection (monitoring?) isn't cru=
cial when it =20
br/&gt;&gt;&gt;&gt;&gt;&gt; comes to timely (actuaally real-time) reaction. H=
owever, this =20
br/&gt;&gt;&gt;&gt;&gt;&gt; secttion isn't just about performance data colle=
ction as it is about =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; "Performance-aware routing" this seems to tr=
y to interact in =20
br/&gt;&gt;&gt;&gt;&gt;&gt; real-time with the network behhavior of TCP. Thi=
s isn't even close =20
br/&gt;&gt;&gt;&gt;&gt;&gt; to acceeptable.

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would be ok to say that it is useful to collect p=
erformance data =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for offline analysis  and improvement of the dat=
a network. However, =20
br/&gt;&gt;&gt;&gt;&gt;&amp;ggt; this is at completely different magnitues o=
f time scales.

<br><span class=3D"">&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the TCP part from this s=
ection entirely.

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt;Ack, will update in next rev:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; Section will read like this:

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt; /Knowing the path associated with flows/packets, the en=
d host may/

<br>&gt;&gt;&gt;&gt; /deduce certain characteristics of the path on its own,=
 and/

<br>&gt;&gt;&gt;&gt; /additionally use the information supplied with path in=
formation/

<br>&gt;&gt;&gt;&gt; /pushed from the controller or received via pull reques=
t. The host/

<br>&gt;&gt;&gt;&gt; /may further share its path observations with the centr=
alized agent,/

<br>&gt;&gt;&gt;&gt; /so that the latter may keep up-to-date network health m=
ap to assist/

<br>&gt;&gt;&gt;&gt; /other hosts with this information./

<br>&gt;&gt;&gt;&gt; //

<br>&gt;&gt;&gt;&gt; /For example, an application A.1 at HostA may pin a flo=
w destined/

<br>&gt;&gt;&gt;&gt; /to HostZ via Spine node Node5 using label stack {16005=
, 16011}. The/

<br>&gt;&gt;&gt;&gt; /application A.1 may collect information on packet loss=
, deduced from/

<br>&gt;&gt;&gt;&gt; /Other offline mechanisms. [There are some pingMesh mec=
hanisms which /

<br>&gt;&gt;&gt;&gt; /Can be used here]/

<br>&gt;&gt;&gt;&gt; /Through these mechanisms information to a centralized a=
gent, e.g./

<br>&gt;&gt;&gt;&gt; /after a flow completes, or periodically for longer liv=
ed flows./

<br>&gt;&gt;&gt;&gt; /Next, using both local and/or global performance data,=
 application/

<br>&gt;&gt;&gt;&gt; /A.1 as well as other applications sharing the same res=
ources in the/

<br>&gt;&gt;&gt;&gt; /DC fabric may pick up the best path for the new flow, o=
r update an/

<br>&gt;&gt;&gt;&gt; /existing path (e.g.: when informed of congestion on an=
 existing/

<br>&gt;&gt;&gt;&gt; /path)./

<br>&gt;&gt;&gt;&gt; ;

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; Section 3, 3rd bullet point:

<br></span>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It is the foundation of TCP that the=
 network is regarded as a =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; black box  and that you infer from the t=
ransmission of packets =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt;&gt; what the current state of the network p=
ath is. Inferring network =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; path metrics (you mention  SRTT, MSS, CW=
ND ) is a bad idea, as =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;; this would required that all paths exhi=
bit this and if not what =20
br//&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; is going to happen?

<br>&gt;&gt;&gt;&gt;&gt;&gt;&gt; It could be an interesting research field t=
o change many points =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt; in TCP'ss behavior, but this once again p=
oints to the fact that =20
br/&gt;&gt;&gt;&amp;&gt;&gt;&gt;&gt;&gt; this not the IETF works but IRTF or=
 elsewhere.

<br>&gt;&gt;&gt;&gt;&gt;&gt; [Gaurav] Martin, Authors are trying to suggest t=
hat TCP is rightly =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; treating  Network as Black Box. Authors are i=
mplying per path =20
br/&gt;&gt;&gt;&gt;;&gt;&gt;&gt; performance metrics as not cached. Is there=
 some change in text =20
br/&gt;&gt;&gt;&gt;&gt;&gt;&gt; you are suggesting??

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; I would recommend to remove the 3rd bullet point co=
mpletey. TCP =20
br/&gt;&gt;&gt;&gt;&gt;&gt; isn't the place to rememmber "good" or "bad" pat=
hs. This is =20
br/&gt;&gt;&gt;&gt;&gt;&gt;  something the network could decide, e.g., rerou=
ting TCP flows =20
br/&gt;&amp;ggt;&gt;&gt;&gt;&gt; within the network or changing the forwardi=
ng path in the network =20
br/&gt;&gt;&gt;&gt;&gt;&gt; for particular flows (if it is  not routed).

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt; &lt;Gaurav&gt; Ack, after discussion, we will remove th=
e Section 3 - 3rd =20
br/&gt;&gt;&gt;&gt;&gt; bullet point.&nbsp;Willl update in next rev - coming=
 shortly.

<br>&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; Kind regards,

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;&gt; &nbsp;Martin

<br>&gt;&gt;&gt;&gt;&gt;

<br>&gt;&gt;&gt;&gt;

<br></div></div></span></blockquote>
</blockquote></div><br></div></div>
</div></blockquote></div></body></html>=

--Apple-Mail-0394868E-2976-461A-8E27-9D21FB7DA906--


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Subject: [spring] Ben Campbell's No Objection on draft-ietf-spring-segment-routing-ldp-interop-13: (with COMMENT)
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Ben Campbell has entered the following ballot position for
draft-ietf-spring-segment-routing-ldp-interop-13: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Please consider using the RFC 8174 boilerplate for the requirements language
section. There are a number of lower case instances of 2119 keywords.

Â§1, 2nd paragraph: Missing article before " Segment Routing control plane..."



From nobody Tue Jun 19 00:24:16 2018
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From: <bruno.decraene@orange.com>
To: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: IPR Poll for draft-ietf-spring-segment-routing-mpls
Thread-Index: AQHUBzoksoF55Oz8Rs2tGTPM6xdQk6RnLi2Q
Date: Tue, 19 Jun 2018 07:24:09 +0000
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Subject: [spring] FW: IPR Poll for draft-ietf-spring-segment-routing-mpls
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, James Bensley <jwbensley@gmail.com>
CC: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "spring@ietf.org" <spring@ietf.org>, "Martin.Horneffer@telekom.de" <Martin.Horneffer@telekom.de>, "BRUNGARD, DEBORAH A" <db3546@att.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, Alvaro Retana <aretana.ietf@gmail.com>, "bruno.decraene@orange.com> <bruno.decraene@orange.com" <bruno.decraene@orange.com>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, Rob Shakir <rjs@rob.sh>, Martin Vigoureux <martin.vigoureux@nokia.com>
Thread-Topic: [spring] [Editorial Errata Reported] RFC7855 (5384)
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Date: Tue, 19 Jun 2018 07:49:00 +0000
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On 18 June 2018 at 15:19, Rob Shakir <robjs@google.com> wrote:
> iff is common language in most technical/academic documentation I believe.
> Whilst I am sympathetic to wanting to ensure that RFCs are as easy to parse
> as possible for as wide an audience as possible I think that we have to have
> some level at which we assume the reader can refer to external references
> should they not be familiar with the terminology used. The RFC Editor team
> is good at keeping authors honest around this bar.
>
> James - I would encourage you to review the documents that are in last call
> in the working group for these kinds of clarifications if you have time
> please. Making these edits before we cut an RFC is preferable.
>
> Thanks!
> r.

On the case - just submitted a minor typo to the authors of
draft-ietf-isis-segment-routing-msd-12, I'm still reading through all
the drafts.

Cheers,
James.


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To: Rob Shakir <robjs=40google.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>
References: <CAHd-QWt+nmQz_R7kE2oeHa2cD88+ndSkpiv56WSFJfHH3PzxRQ@mail.gmail.com>
From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Tue, 19 Jun 2018 12:18:57 +0100
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Subject: Re: [spring] Updating the SPRING WG Charter
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On 01/06/2018 17:05, Rob Shakir wrote:
> The SPRING WG defines procedures that allow a node to steer a packet 
> through an
> SR Policy instantiated as an ordered list of instructions called 
> segments and
> without the need for per-path state information to be held at transit 
> nodes.

I am not sure where the line gets drawn with the per-path state 
statement. If I introduce a
binding-SID to allow the creation of a path, have I introduced per-path 
state or not? In practise
a management entity will choose between the infinity of possible 
binding-SIDs by considering
the need to create specific paths and I would imagine that many will be 
instantiated just-in-time.

I think that the key point is that the ingress creates the path by using 
SIDs to create
a concatenation of paths, policies and resources. However it could be 
argued that
as soon as we introduced Binding SIDs we introduced per-path state. I 
think we might
be best served by deleting the text I have highlighted.

- Stewart






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    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 01/06/2018 17:05, Rob Shakir wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAHd-QWt+nmQz_R7kE2oeHa2cD88+ndSkpiv56WSFJfHH3PzxRQ@mail.gmail.com">
      <div><font face="monospace">The SPRING WG defines procedures that
          allow a node to steer a packet through an</font></div>
      <div><font face="monospace">SR Policy instantiated as an ordered
          list of instructions called segments <font color="#ff0000">and</font></font></div>
      <div><font face="monospace" color="#ff0000">without the need for
          per-path state information to be held at transit nodes.</font></div>
    </blockquote>
    <br>
    I am not sure where the line gets drawn with the per-path state
    statement. If I introduce a<br>
    binding-SID to allow the creation of a path, have I introduced
    per-path state or not? In practise<br>
    a management entity will choose between the infinity of possible
    binding-SIDs by considering<br>
    the need to create specific paths and I would imagine that many will
    be instantiated just-in-time.<br>
    <br>
    I think that the key point is that the ingress creates the path by
    using SIDs to create<br>
    a concatenation of paths, policies and resources. However it could
    be argued that<br>
    as soon as we introduced Binding SIDs we introduced per-path state.
    I think we might<br>
    be best served by deleting the text I have highlighted.<br>
    <br>
    - Stewart<br>
    <br>
    <br>
    <br>
    <br>
    <br>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: SPRING WG List <spring@ietf.org>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Stewart Bryant <stewart.bryant@gmail.com>
CC: SPRING WG List <spring@ietf.org>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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To: Robert Raszuk <robert@raszuk.net>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>, Michael McBride <michael.mcbride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Paul Mattes <pamattes@microsoft.com>, "Zafar Ali (zali)" <zali@cisco.com>, Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
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From: Stewart Bryant <stewart.bryant@gmail.com>
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For clarification:

Can I assume that we are talking about replication at ingress to a 
series ofÂ  unicast SR paths each to an installed multicast tree close to 
egress?

- Stewart


On 10/06/2018 10:58, Robert Raszuk wrote:
> Hey Sasha,
>
> 100% agree with your last post. Very glad to see your support for 
> spray/fan-out or if you will
> static MDTs to be in scope of SPRING.
>
> Based on number of WG members input expressed both at the meeting and 
> on the listÂ  I hope
> proposed SPRING charter will be updated soon to reflect that.
>
> Cheers,
> R.
>
> â€‹PS. Btw - I am also ok that ingress replication is not relevant to 
> SPRING as it essentially happens at the
> ingress to the domain. â€‹
>
>
>
> On Sun, Jun 10, 2018 at 7:39 AM, Alexander Vainshtein 
> <Alexander.Vainshtein@ecitele.com 
> <mailto:Alexander.Vainshtein@ecitele.com>> wrote:
>
>     Robert,
>
>     First of all, I did not say that your quote was inaccurate. I
>     apologize for possible misperception.
>
>     Second, I believe that spray or fan-out (meaning support of
>     externally computed static MDTs) in SR-MPLS is a relevant focus
>     area for the future WG work. Of course the solution must be
>     aligned with the SPRING and MPLS architecture, and this imposes
>     additional restrictions on how such a solution would look.
>
>     Last but not least, I have differentiated (from my first email on
>     this thread) */ingress replication/* *in SR* from the more generic
>     *multicast support *in SR:
>
>     -The latter is quite acceptable to me
>
>     -The former, IMHO, should be left out of scope.
>
>     Hope this helps to clarify my position.
>
>     Regards, and, again, apologies for possible misinterpretation.
>
>     Sasha
>
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring


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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p>For clarification:</p>
    <p>Can I assume that we are talking about replication at ingress to
      a series ofÂ  unicast SR paths each to an installed multicast tree
      close to egress?</p>
    <p>- Stewart<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 10/06/2018 10:58, Robert Raszuk
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CA+b+ERkXj4PHmUBAscG7dp-NFFr+iBUz_ya9X85jRdwpZ8kOyw@mail.gmail.com">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Hey
          Sasha,<br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">100%
          agree with your last post. Very glad to see your support for
          spray/fan-out or if you willÂ </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">static
          MDTs to be in scope of SPRING.Â </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Based
          on number of WG members input expressed both at the meeting
          and on the listÂ  I hope</div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">proposed
          SPRING charter will be updated soon to reflect that.Â </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Cheers,<br>
          R.</div>
        <div class="gmail_extra"><br>
        </div>
        <div class="gmail_extra">
          <div class="gmail_default"
            style="font-family:arial,helvetica,sans-serif;font-size:small">â€‹PS.
            Btw - I am also ok that ingress replication is not relevant
            to SPRING as it essentially happens at theÂ </div>
          <div class="gmail_default"
            style="font-family:arial,helvetica,sans-serif;font-size:small">ingress
            to the domain. â€‹</div>
          <br>
        </div>
        <div class="gmail_extra"><br>
        </div>
        <div class="gmail_extra"><br>
          <div class="gmail_quote">On Sun, Jun 10, 2018 at 7:39 AM,
            Alexander Vainshtein <span dir="ltr">&lt;<a
                href="mailto:Alexander.Vainshtein@ecitele.com"
                target="_blank" moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div link="blue" vlink="purple" lang="EN-US">
                <div class="m_8781384223204297339WordSection1">
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Robert,</span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">First
                      of all, I did not say that your quote was
                      inaccurate. I apologize for possible
                      misperception.</span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Second,
                      I believe that spray or fan-out (meaning support
                      of externally computed static MDTs) in SR-MPLS is
                      a relevant focus area for the future WG work. Of
                      course the solution must be aligned with the
                      SPRING and MPLS architecture, and this imposes
                      additional restrictions on how such a solution
                      would look.
                    </span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Last
                      but not least, I have differentiated (from my
                      first email on this thread)
                      <b><i>ingress replication</i></b> <b>in SR</b>
                      from the more generic <b>multicast support
                      </b>in SR:</span></p>
                  <p class="m_8781384223204297339MsoListParagraph"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>-<span
                          style="font:7.0pt &quot;Times New Roman&quot;">Â Â Â Â Â Â Â Â Â 
                        </span></span></span><span dir="LTR"></span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The
                      latter is quite acceptable to me</span></p>
                  <p class="m_8781384223204297339MsoListParagraph"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>-<span
                          style="font:7.0pt &quot;Times New Roman&quot;">Â Â Â Â Â Â Â Â Â 
                        </span></span></span><span dir="LTR"></span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The
                      former, IMHO, should be left out of scope.
                    </span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hope
                      this helps to clarify my position.</span></p>
                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Regards,
                      and, again, apologies for possible
                      misinterpretation.</span></p>
                  <span class="">
                    <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                    <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Sasha</span></p>
                  </span></div>
              </div>
            </blockquote>
          </div>
        </div>
      </div>
      <!--'"--><br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
spring mailing list
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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 19 Jun 2018 15:39:27 +0200
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To: Stewart Bryant <stewart.bryant@gmail.com>
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--000000000000a9f890056efecf73
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Hi Stewart,

Nope that would be incorrect assumption.

Replication anchors would be where topologically it makes sense. And there
may not be at all any multicast trees those subject flows would need to
traverse. It is just about efficiency in content distribution.

Regards,
R.

On Tue, Jun 19, 2018 at 3:36 PM, Stewart Bryant <stewart.bryant@gmail.com>
wrote:

> For clarification:
>
> Can I assume that we are talking about replication at ingress to a series
> of  unicast SR paths each to an installed multicast tree close to egress?
>
> - Stewart
>
> On 10/06/2018 10:58, Robert Raszuk wrote:
>
> Hey Sasha,
>
> 100% agree with your last post. Very glad to see your support for
> spray/fan-out or if you will
> static MDTs to be in scope of SPRING.
>
> Based on number of WG members input expressed both at the meeting and on
> the list  I hope
> proposed SPRING charter will be updated soon to reflect that.
>
> Cheers,
> R.
>
> =E2=80=8BPS. Btw - I am also ok that ingress replication is not relevant =
to SPRING
> as it essentially happens at the
> ingress to the domain. =E2=80=8B
>
>
>
> On Sun, Jun 10, 2018 at 7:39 AM, Alexander Vainshtein <
> Alexander.Vainshtein@ecitele.com> wrote:
>
>> Robert,
>>
>> First of all, I did not say that your quote was inaccurate. I apologize
>> for possible misperception.
>>
>>
>>
>> Second, I believe that spray or fan-out (meaning support of externally
>> computed static MDTs) in SR-MPLS is a relevant focus area for the future=
 WG
>> work. Of course the solution must be aligned with the SPRING and MPLS
>> architecture, and this imposes additional restrictions on how such a
>> solution would look.
>>
>>
>>
>> Last but not least, I have differentiated (from my first email on this
>> thread) *ingress replication* *in SR* from the more generic *multicast
>> support *in SR:
>>
>> -          The latter is quite acceptable to me
>>
>> -          The former, IMHO, should be left out of scope.
>>
>>
>>
>> Hope this helps to clarify my position.
>>
>> Regards, and, again, apologies for possible misinterpretation.
>>
>>
>>
>> Sasha
>>
>
>
> _______________________________________________
> spring mailing listspring@ietf.orghttps://www.ietf.org/mailman/listinfo/s=
pring
>
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi Stewart,</div><div class=3D"gmail_de=
fault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br=
></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif;font-size:small">Nope that would be incorrect assumption.=C2=A0</d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small">Replication anchors woul=
d be where topologically it makes sense. And there may not be at all any mu=
lticast trees those subject flows would need to traverse. It is just about =
efficiency in content distribution.=C2=A0</div><div class=3D"gmail_default"=
 style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div=
><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-ser=
if;font-size:small">Regards,</div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">R.</div><div class=3D"=
gmail_extra"><br><div class=3D"gmail_quote">On Tue, Jun 19, 2018 at 3:36 PM=
, Stewart Bryant <span dir=3D"ltr">&lt;<a href=3D"mailto:stewart.bryant@gma=
il.com" target=3D"_blank">stewart.bryant@gmail.com</a>&gt;</span> wrote:<br=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF">
    <p>For clarification:</p>
    <p>Can I assume that we are talking about replication at ingress to
      a series of=C2=A0 unicast SR paths each to an installed multicast tre=
e
      close to egress?</p><span class=3D"HOEnZb"><font color=3D"#888888">
    <p>- Stewart<br>
    </p></font></span><div><div class=3D"h5">
    <br>
    <div class=3D"m_-1013065469322969916moz-cite-prefix">On 10/06/2018 10:5=
8, Robert Raszuk
      wrote:<br>
    </div>
    </div></div><blockquote type=3D"cite"><div><div class=3D"h5">
      <div dir=3D"ltr">
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">Hey
          Sasha,<br>
        </div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l"><br>
        </div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">100%
          agree with your last post. Very glad to see your support for
          spray/fan-out or if you will=C2=A0</div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">static
          MDTs to be in scope of SPRING.=C2=A0</div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l"><br>
        </div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">Based
          on number of WG members input expressed both at the meeting
          and on the list=C2=A0 I hope</div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">proposed
          SPRING charter will be updated soon to reflect that.=C2=A0</div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l"><br>
        </div>
        <div style=3D"font-family:arial,helvetica,sans-serif;font-size:smal=
l">Cheers,<br>
          R.</div>
        <div class=3D"gmail_extra"><br>
        </div>
        <div class=3D"gmail_extra">
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">=E2=80=8BPS.
            Btw - I am also ok that ingress replication is not relevant
            to SPRING as it essentially happens at the=C2=A0</div>
          <div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">ingress
            to the domain. =E2=80=8B</div>
          <br>
        </div>
        <div class=3D"gmail_extra"><br>
        </div>
        <div class=3D"gmail_extra"><br>
          <div class=3D"gmail_quote">On Sun, Jun 10, 2018 at 7:39 AM,
            Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"mailto:Al=
exander.Vainshtein@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ecit=
ele.<wbr>com</a>&gt;</span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex">
              <div link=3D"blue" vlink=3D"purple" lang=3D"EN-US">
                <div class=3D"m_-1013065469322969916m_8781384223204297339Wo=
rdSection1">
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Robert,</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">First
                      of all, I did not say that your quote was
                      inaccurate. I apologize for possible
                      misperception.</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Second,
                      I believe that spray or fan-out (meaning support
                      of externally computed static MDTs) in SR-MPLS is
                      a relevant focus area for the future WG work. Of
                      course the solution must be aligned with the
                      SPRING and MPLS architecture, and this imposes
                      additional restrictions on how such a solution
                      would look.
                    </span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Last
                      but not least, I have differentiated (from my
                      first email on this thread)
                      <b><i>ingress replication</i></b> <b>in SR</b>
                      from the more generic <b>multicast support
                      </b>in SR:</span></p>
                  <p class=3D"m_-1013065469322969916m_8781384223204297339Ms=
oListParagraph"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
                        </span></span></span><span dir=3D"LTR"></span><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1f497d">The
                      latter is quite acceptable to me</span></p>
                  <p class=3D"m_-1013065469322969916m_8781384223204297339Ms=
oListParagraph"><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
                        </span></span></span><span dir=3D"LTR"></span><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1f497d">The
                      former, IMHO, should be left out of scope.
                    </span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hope
                      this helps to clarify my position.</span></p>
                  <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Regards,
                      and, again, apologies for possible
                      misinterpretation.</span></p>
                  <span>
                    <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></p>
                    <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Sasha</span></p>
                  </span></div>
              </div>
            </blockquote>
          </div>
        </div>
      </div>
      <br>
      <fieldset class=3D"m_-1013065469322969916mimeAttachmentHeader"></fiel=
dset>
      <br>
      </div></div><span class=3D""><pre>______________________________<wbr>=
_________________
spring mailing list
<a class=3D"m_-1013065469322969916moz-txt-link-abbreviated" href=3D"mailto:=
spring@ietf.org" target=3D"_blank">spring@ietf.org</a>
<a class=3D"m_-1013065469322969916moz-txt-link-freetext" href=3D"https://ww=
w.ietf.org/mailman/listinfo/spring" target=3D"_blank">https://www.ietf.org/=
mailman/<wbr>listinfo/spring</a>
</pre>
    </span></blockquote>
    <br>
  </div>

</blockquote></div><br></div></div>

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "draft-ietf-isis-segment-routing-extensions.all@ietf.org" <draft-ietf-isis-segment-routing-extensions.all@ietf.org>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: A question about Mirror SID and its advertisement using IS-IS
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Date: Tue, 19 Jun 2018 14:27:29 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/aCR2VJr2sYIokj5bXdL_BTxzqFo>
Subject: [spring] A question about Mirror SID and its advertisement using IS-IS
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Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its=
 advertisement defined in the IS-IS extensions for SR<https://datatracker.=
ietf.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follo=
wing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#secti=
on-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-i=
sis-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any=
 such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror c=
ontext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions=
-17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segmen=
t-routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensio=
ns-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org=
/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-se=
gment-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to=
 the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Co=
ntext SID is a segment that identifies the node, and not any prefix. And, =
of course the SR Architecture draft does not describe usage of any flags.

What (if anything) did I miss?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about Mirror SID as defined in th=
e <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing=
-15">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"=
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extension=
s/">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Arch=
itecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-line-height-alt:0pt">
<a name=3D"section-5.1"></a><a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-segment-routing-15#section-5.1"><span style=3D"mso-bookmark:&qu=
ot;section-5\.1&quot;"><b><span style=3D"font-size:10.0pt;font-family:&quo=
t;Courier New&quot;;color:black">5.1</span></b></span><span style=3D"mso-b=
ookmark:&quot;section-5\.1&quot;"></span></a><span style=3D"mso-bookmark:&=
quot;section-5\.1&quot;"></span><b><span style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:black">.&nbsp;
 IGP Mirroring Context Segment<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; One use case for a Binding Segm=
ent is to provide support for an IGP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability t=
o process traffic originally destined<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the=
 Mirrored node and identified by an IP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided=
 that a &quot;Mirroring Context&quot; segment be<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list pr=
ior to any service segment local to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.<o:p></o:p></=
span></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to=
 provide egress node A protection, it<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identif=
ying node's A context.&nbsp; Such segment is<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context =
Segment&quot; and identified by the Mirror SID.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised=
 using the binding segment defined in SR<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#r=
ef-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensio=
ns for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>=
] .<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a=
 point of local repair (PLR) diverting<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a P=
USH of the Mirror SID on the protected<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when recei=
ving the traffic with the Mirror SID as the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that se=
gment and processes underlying segments<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.<o:p></o=
:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <=
span style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft=
 only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a name=3D"section-2.4"></a><a href=3D=
"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-17=
#section-2.4"><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"><span =
style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black"=
>2.4</span></span><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"></=
span></a><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"></span><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:blac=
k">.&nbsp;
 SID/Label Binding TLV<o:p></o:p></span></h3>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MA=
Y be originated by any router in an IS-IS<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:ye=
llow;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise =
prefixes to SID/Label<o:p></o:p></span></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routin=
g Mapping<o:p></o:p></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The beh=
avior of the SRMS is defined in<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.ie=
tf.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spr=
ing-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworki=
ng=20with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a name=3D"section-2.4.1"></a><a hre=
f=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension=
s-17#section-2.4.1"><span style=3D"mso-bookmark:&quot;section-2\.4\.1&quot=
;"><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;col=
or:black">2.4.1</span></span><span style=3D"mso-bookmark:&quot;section-2\.=
4\.1&quot;"></span></a><span style=3D"mso-bookmark:&quot;section-2\.4\.1&q=
uot;"></span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New=
&quot;;color:black">.&nbsp;
 Flags<o:p></o:p></span></h4>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of foll=
owing flags:<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7<o:p></=
o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp=
;&nbsp; |<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Ad=
dress Family flag.&nbsp; If unset, then the Prefix carries an<o:p></o:p></=
span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefi=
x.&nbsp; If set then the Prefix carries an IPv6 Prefix.<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mi=
rror Context flag.&nbsp; Set if the advertised SID<o:p></o:p></span></pre>=

<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; correspond=
s to a mirrored context.&nbsp; The use of the M flag is<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described =
in [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing=
-extensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment=
 Routing Architecture&quot;">I-D.ietf-spring-segment-routing</a>].<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black">...<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is relate=
d to the SRMS &#8211; but, to the best of my understanding, these are comp=
letely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft say=
s that the Mirroring Context SID is a segment that identifies the node, an=
d not any prefix. And, of course the SR Architecture draft does not descri=
be usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Subject: Re: [spring] Updating the SPRING WG Charter
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On 19/06/2018 13:38, bruno.decraene@orange.com wrote:
>
> Hi Stewart,
>
> Speaking as individual contributor, please see inline [Bruno]
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of *Stewart 
> Bryant
> *Sent:* Tuesday, June 19, 2018 1:19 PM
>
> On 01/06/2018 17:05, Rob Shakir wrote:
>
>     The SPRING WG defines procedures that allow a node to steer a
>     packet through an
>
>     SR Policy instantiated as an ordered list of instructions called
>     segments and
>
>     without the need for per-path state information to be held at
>     transit nodes.
>
>
> I am not sure where the line gets drawn with the per-path state 
> statement. If I introduce a
> binding-SID to allow the creation of a path, have I introduced 
> per-path state or not? In practise
> a management entity will choose between the infinity of possible 
> binding-SIDs by considering
> the need to create specific paths and I would imagine that many will 
> be instantiated just-in-time.
>
> I think that the key point is that the ingress creates the path by 
> using SIDs to create
> a concatenation of paths, policies and resources.
>
> [Bruno] Agreed. And it can be argued that this creates a state on the 
> ingress. An â€œoutgoingâ€ state, very roughly comparable to Next Hop 
> Label Forwarding Entry (NHLFE))
>
> However it could be argued that
> as soon as we introduced Binding SIDs we introduced per-path state.
>
> [Bruno] Adding a Binding SID to this SR policy introduces an 
> â€œincomingâ€ state, very roughly comparable to Incoming Label Map (ILM). 
> But this gets additional benefit as it allows others SR nodes to use 
> this state/SR policy.
>
> Iâ€™m not sure that in such high level text, we need to make such 
> distinction.
>
> I think we might
> be best served by deleting the text I have highlighted.
>
> [Bruno] This text is mostly a copy/past from existing charter so is 
> not really new:
> â€œallow a node to steer a packet along an explicit
>
> Â  route using information attached to the packet and
>
> Â  without the need for per-path state information to be
>
> Â  held at transit nodes. â€
>

The text of course is a direct derivative of the original charter text:

The SPRING working group will define procedures that will allow
a node to steer a packet between any source and destination through
a SPRING region on any path without requiring state to be
maintained by transited nodes, but rather at the source device.


However that pre-dates the introduction of binding SIDs which although 
can be considered a type of shared link are non-the-less state usually 
introduced to overcome a specific limitation in the SR hardware, since 
they achieve nothing that base SR cannot achieve without them.


> At high level, I believe that this is a key distinction of 
> spring/segment routing hence worth keeping in the high level 
> introduction of the WG.
>
> Now do we need to add text about more specific details, such as BSID? 
> Iâ€™d rather not, as I donâ€™t see what this would bring. I also donâ€™t 
> think that this sentence prohibits the creation of states when 
> required/useful.
>
I suppose if you replaced:

and without the need for per-path state information to be held at 
transit nodes.

with

with minimum path state introduced at the transit nodes.

that would be closer to the design we have.

- Stewart


> --Bruno
>
>
> - Stewart
>
>
>
>
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    <div class="moz-cite-prefix">On 19/06/2018 13:38,
      <a class="moz-txt-link-abbreviated" href="mailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a> wrote:<br>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Hi
            Stewart,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
            lang="EN-US">Speaking as individual contributor, please see
            inline [Bruno]<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
            lang="EN-US"><o:p>Â </o:p></span></p>
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
          0cm 0cm 4.0pt">
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext">
                  spring [<a class="moz-txt-link-freetext" href="mailto:spring-bounces@ietf.org">mailto:spring-bounces@ietf.org</a>]
                  <b>On Behalf Of </b>Stewart Bryant<br>
                  <b>Sent:</b> Tuesday, June 19, 2018 1:19 PM<br>
                  <br>
                  <o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p>Â </o:p></p>
          <p><o:p>Â </o:p></p>
          <p class="MsoNormal"><o:p>Â </o:p></p>
          <div>
            <p class="MsoNormal">On 01/06/2018 17:05, Rob Shakir wrote:<o:p></o:p></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;">The SPRING
                  WG defines procedures that allow a node to steer a
                  packet through an</span><o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;">SR Policy
                  instantiated as an ordered list of instructions called
                  segments
                </span><span style="font-family:&quot;Courier
                  New&quot;;color:red">and</span><o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;;color:red">without
                  the need for per-path state information to be held at
                  transit nodes.</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
            I am not sure where the line gets drawn with the per-path
            state statement. If I introduce a<br>
            binding-SID to allow the creation of a path, have I
            introduced per-path state or not? In practise<br>
            a management entity will choose between the infinity of
            possible binding-SIDs by considering<br>
            the need to create specific paths and I would imagine that
            many will be instantiated just-in-time.<br>
            <br>
            I think that the key point is that the ingress creates the
            path by using SIDs to create<br>
            a concatenation of paths, policies and resources.<span
              style="color:black"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
              lang="EN-US">[Bruno] Agreed. And it can be argued that
              this creates a state on the ingress. An â€œoutgoingâ€ state,
              very roughly comparable to Next Hop Label Forwarding Entry
              (NHLFE))<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              lang="EN-US">However it could be argued that<br>
              as soon as we introduced Binding SIDs we introduced
              per-path state.</span><span style="color:black"
              lang="EN-US"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
              lang="EN-US">[Bruno] Adding a Binding SID to this SR
              policy introduces an â€œincomingâ€ state, very roughly
              comparable to Incoming Label Map (ILM). But this gets
              additional benefit as it allows others SR nodes to use
              this state/SR policy.<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
              lang="EN-US">Iâ€™m not sure that in such high level text, we
              need to make such distinction.<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              lang="EN-US">I think we might<br>
              be best served by deleting the text I have highlighted.<br>
              <br>
            </span><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
              lang="EN-US"><o:p></o:p></span></p>
          <pre><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black" lang="EN-US">[Bruno] This text is mostly a copy/past from existing charter so is not really new:<o:p></o:p></span></pre>
          <pre><span style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black" lang="EN-US"> â€œ</span><span lang="EN-US">allow a node to steer a packet along an explicit<o:p></o:p></span></pre>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext" lang="EN-US">Â  route using
              information attached to the packet and<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext" lang="EN-US">Â  without the
              need for per-path state information to be<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext" lang="EN-US">Â  held at transit
              nodes.
            </span><span
style="font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"
              lang="EN-US">â€<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="color:black" lang="EN-US"><o:p>Â </o:p></span></p>
        </div>
      </div>
    </blockquote>
    <br>
    The text of course is a direct derivative of the original charter
    text:<br>
    <br>
    <pre style="box-sizing: border-box; overflow: auto; font-family: &quot;PT Mono&quot;, Monaco, monospace; font-size: 14px; display: block; padding: 10px; margin: 0px 0px 10.5px; line-height: 1.214; color: rgb(0, 0, 0); word-break: break-all; word-wrap: break-word; background-color: rgb(255, 253, 245); border: 1px solid rgb(204, 204, 204); border-radius: 4px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">The SPRING working group will define procedures that will allow
a node to steer a packet between any source and destination through
a SPRING region on any path without requiring state to be
maintained by transited nodes, but rather at the source device. </pre>
    <br>
    However that pre-dates the introduction of binding SIDs which
    although can be considered a type of shared link are non-the-less
    state usually introduced to overcome a specific limitation in the SR
    hardware, since they achieve nothing that base SR cannot achieve
    without them.<br>
    <br>
    <br>
    <blockquote type="cite"
cite="mid:26239_1529411902_5B28F93E_26239_344_4_53C29892C857584299CBF5D05346208A47AA5A6B@OPEXCLILM21.corporate.adroot.infra.ftgroup">
      <div class="WordSection1">
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
          0cm 0cm 4.0pt">
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="color:black" lang="EN-US">At high level, I believe
              that this is a key distinction of spring/segment routing
              hence worth keeping in the high level introduction of the
              WG.<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="color:black" lang="EN-US">Now do we need to add
              text about more specific details, such as BSID? Iâ€™d rather
              not, as I donâ€™t see what this would bring. I also donâ€™t
              think that this sentence prohibits the creation of states
              when required/useful.<o:p></o:p></span></p>
        </div>
      </div>
    </blockquote>
    I suppose if you replaced:<br>
    <br>
    and without the need for per-path state information to be held at
    transit nodes. <br>
    <br>
    with<br>
    <br>
    with minimum path state introduced at the transit nodes.<br>
    <br>
    that would be closer to the design we have.<br>
    <br>
    - Stewart<br>
    <br>
    <br>
    <blockquote type="cite"
cite="mid:26239_1529411902_5B28F93E_26239_344_4_53C29892C857584299CBF5D05346208A47AA5A6B@OPEXCLILM21.corporate.adroot.infra.ftgroup">
      <div class="WordSection1">
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
          0cm 0cm 4.0pt">
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="color:black" lang="EN-US">--Bruno<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              lang="EN-US"><br>
              - Stewart<br>
              <br>
              <br>
              <br>
              <br>
              <o:p></o:p></span></p>
        </div>
      </div>
      <pre>_________________________________________________________________________________________________________________________

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    </blockquote>
    <br>
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Subject: Re: [spring] Updating the SPRING WG Charter
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To: David Allan I <david.i.allan@ericsson.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Cc: SPRING WG List <spring@ietf.org>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>
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From: Stewart Bryant <stewart.bryant@gmail.com>
Message-ID: <ebfdd17f-b6a8-0e49-1b18-e3f784bca471@gmail.com>
Date: Tue, 19 Jun 2018 17:07:53 +0100
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Subject: Re: [spring] Updating the SPRING WG Charter
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Yes, I agree.

- S


On 19/06/2018 16:53, David Allan I wrote:
>
> Hi
>
> I do not quite get the same warm and fuzzy from the definition when 
> thinking about multicastâ€¦..
>
> The mapping of the binding SID to local policy is still IMO per path 
> state. For a simple p2p path it is pretty straightforward as the 
> mapping can be to a common policy abstraction at every node (send to 
> â€˜xâ€™) .
>
> In the case of multicast, the mapping would be unique at every node 
> that had state for the binding SID (send copy to â€˜aâ€™ and â€˜bâ€™, send 
> copy to â€˜mâ€™ and â€˜qâ€™ etc.) .Â  So some means of disseminating the 
> mappings is required, and correlating them with the SID.Â  So the 
> difference between a binding SID and a global SID for multicast IMO is 
> choice of terminology.
>
> So you have to decide if the whole â€œavoiding per path stateâ€ 
> discussion is simply a desirable goal, or a strict admonition. Â A bulk 
> overprovisioning model to eliminate per path state will not work for 
> multicast.
>
> Cheers
>
> Dave
>
> *From:*spring <spring-bounces@ietf.org> *On Behalf Of *Alexander 
> Vainshtein
> *Sent:* Tuesday, June 19, 2018 6:38 AM
> *To:* bruno.decraene@orange.com; Stewart Bryant <stewart.bryant@gmail.com>
> *Cc:* SPRING WG List <spring@ietf.org>; Rob Shakir 
> <robjs=40google.com@dmarc.ietf.org>
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
> Bruno, Stewart and all,
>
> I have looked up Section 5 â€œ*/Binding Segment/*â€ of the Segment 
> Routing Architecture 
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15>draft, 
> and it says:
>
> In order to provide greater scalability, network opacity, and service
>
> independence, SR utilizes a Binding SID (BSID).Â  The BSID is bound to
>
> an SR policy, instantiation of which may involve a list of SIDs.Â  Any
>
> packets received with active segment = BSID are steered onto the
>
> bound SR Policy.
>
> A BSID may either be a local or a global SID.Â  If local, a BSID
>
> SHOULD be allocated from the SRLB.Â  If global, a BSID MUST be
>
> allocated from the SRGB.
>
> Use of a BSID allows the instantiation of the policy (the SID list)
>
> to be stored only on the node(s) which need to impose the policy.
>
> Direction of traffic to a node supporting the policy then only
>
> requires imposition of the BSID.Â  If the policy changes, this also
>
> means that only the nodes imposing the policy need to be updated.
>
> Users of the policy are not impacted.
>
> From my POV this definition is fully aligned both with the Brunoâ€™s 
> last email and with my earlier argument why a BSID does not add a 
> */per-path state/* in the transit nodes.
>
> Regards,
>
> Sasha
>
> Office: +972-39266302
>
> Cell: +972-549266302
>
> Email: Alexander.Vainshtein@ecitele.com 
> <mailto:Alexander.Vainshtein@ecitele.com>
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of 
> *bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>
> *Sent:* Tuesday, June 19, 2018 3:38 PM
> *To:* Stewart Bryant <stewart.bryant@gmail.com 
> <mailto:stewart.bryant@gmail.com>>
> *Cc:* SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>>; Rob 
> Shakir <robjs=40google.com@dmarc.ietf.org 
> <mailto:robjs=40google.com@dmarc.ietf.org>>
> *Subject:* Re: [spring] Updating the SPRING WG Charter
>
> Hi Stewart,
>
> Speaking as individual contributor, please see inline [Bruno]
>
> *From:*spring [mailto:spring-bounces@ietf.org] *On Behalf Of *Stewart 
> Bryant
> *Sent:* Tuesday, June 19, 2018 1:19 PM
>
> On 01/06/2018 17:05, Rob Shakir wrote:
>
>     The SPRING WG defines procedures that allow a node to steer a
>     packet through an
>
>     SR Policy instantiated as an ordered list of instructions called
>     segments and
>
>     without the need for per-path state information to be held at
>     transit nodes.
>
>
> I am not sure where the line gets drawn with the per-path state 
> statement. If I introduce a
> binding-SID to allow the creation of a path, have I introduced 
> per-path state or not? In practise
> a management entity will choose between the infinity of possible 
> binding-SIDs by considering
> the need to create specific paths and I would imagine that many will 
> be instantiated just-in-time.
>
> I think that the key point is that the ingress creates the path by 
> using SIDs to create
> a concatenation of paths, policies and resources.
>
> [Bruno] Agreed. And it can be argued that this creates a state on the 
> ingress. An â€œoutgoingâ€ state, very roughly comparable to Next Hop 
> Label Forwarding Entry (NHLFE))
>
> However it could be argued that
> as soon as we introduced Binding SIDs we introduced per-path state.
>
> [Bruno] Adding a Binding SID to this SR policy introduces an 
> â€œincomingâ€ state, very roughly comparable to Incoming Label Map (ILM). 
> But this gets additional benefit as it allows others SR nodes to use 
> this state/SR policy.
>
> Iâ€™m not sure that in such high level text, we need to make such 
> distinction.
>
> I think we might
> be best served by deleting the text I have highlighted.
>
> [Bruno] This text is mostly a copy/past from existing charter so is 
> not really new:
> â€œallow a node to steer a packet along an explicit
>
> Â  route using information attached to the packet and
>
> Â  without the need for per-path state information to be
>
> Â  held at transit nodes. â€
>
> At high level, I believe that this is a key distinction of 
> spring/segment routing hence worth keeping in the high level 
> introduction of the WG.
>
> Now do we need to add text about more specific details, such as BSID? 
> Iâ€™d rather not, as I donâ€™t see what this would bring. I also donâ€™t 
> think that this sentence prohibits the creation of states when 
> required/useful.
>
> --Bruno
>
>
> - Stewart
>
>
>
>
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    <p>Yes, I agree.</p>
    <p>- S<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 19/06/2018 16:53, David Allan I
      wrote:<br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">Hi
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">I
            do not quite get the same warm and fuzzy from the definition
            when thinking about multicastâ€¦..<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">The
            mapping of the binding SID to local policy is still IMO per
            path state. For a simple p2p path it is pretty
            straightforward as the mapping can be to a common policy
            abstraction at every node (send to â€˜xâ€™) . <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">In
            the case of multicast, the mapping would be unique at every
            node that had state for the binding SID (send copy to â€˜aâ€™
            and â€˜bâ€™, send copy to â€˜mâ€™ and â€˜qâ€™ etc.) .Â  So some means of
            disseminating the mappings is required, and correlating them
            with the SID.Â  So the difference between a binding SID and a
            global SID for multicast IMO is choice of terminology.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">So
            you have to decide if the whole â€œavoiding per path stateâ€
            discussion is simply a desirable goal, or a strict
            admonition. Â A bulk overprovisioning model to eliminate per
            path state will not work for multicast. <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">Cheers<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">Dave<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><o:p>Â </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                spring <a class="moz-txt-link-rfc2396E" href="mailto:spring-bounces@ietf.org">&lt;spring-bounces@ietf.org&gt;</a>
                <b>On Behalf Of </b>Alexander Vainshtein<br>
                <b>Sent:</b> Tuesday, June 19, 2018 6:38 AM<br>
                <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a>; Stewart Bryant
                <a class="moz-txt-link-rfc2396E" href="mailto:stewart.bryant@gmail.com">&lt;stewart.bryant@gmail.com&gt;</a><br>
                <b>Cc:</b> SPRING WG List <a class="moz-txt-link-rfc2396E" href="mailto:spring@ietf.org">&lt;spring@ietf.org&gt;</a>; Rob
                Shakir <a class="moz-txt-link-rfc2396E" href="mailto:robjs=40google.com@dmarc.ietf.org">&lt;robjs=40google.com@dmarc.ietf.org&gt;</a><br>
                <b>Subject:</b> Re: [spring] Updating the SPRING WG
                Charter<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p>Â </o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Bruno,
            Stewart and all,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">I
            have looked up Section 5 â€œ<b><i>Binding Segment</i></b>â€ of
            the
          </span><a
            href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15"
            moz-do-not-send="true"><span
              style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Segment
              Routing Architecture</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">
            draft, and it says:<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            In order to provide greater scalability, network opacity,
            and service<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            independence, SR utilizes a Binding SID (BSID).Â  The BSID is
            bound to<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            an SR policy, instantiation of which may involve a list of
            SIDs.Â  Any<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            packets received with active segment = BSID are steered onto
            the<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            bound SR Policy.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            A BSID may either be a local or a global SID.Â  If local, a
            BSID<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            SHOULD be allocated from the SRLB.Â  If global, a BSID MUST
            be<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            allocated from the SRGB.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            Use of a BSID allows the instantiation of the policy (the
            SID list)<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            to be stored only on the node(s) which need to impose the
            policy.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            Direction of traffic to a node supporting the policy then
            only<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            requires imposition of the BSID.Â  If the policy changes,
            this also<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            means that only the nodes imposing the policy need to be
            updated.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier New&quot;">Â Â 
            Users of the policy are not impacted.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">From
            my POV this definition is fully aligned both with the
            Brunoâ€™s last email and with my earlier argument why a BSID
            does not add a
            <b><i>per-path state</i></b> in the transit nodes.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
        <div>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
              +972-39266302<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:Â Â Â Â Â 
              +972-549266302<o:p></o:p></span></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:Â Â 
            </span><a href="mailto:Alexander.Vainshtein@ecitele.com"
              moz-do-not-send="true"><span
                style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Alexander.Vainshtein@ecitele.com</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>Â </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                spring [</span><a href="mailto:spring-bounces@ietf.org"
                moz-do-not-send="true"><span
                  style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">mailto:spring-bounces@ietf.org</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">]
                <b>On Behalf Of </b></span><a
                href="mailto:bruno.decraene@orange.com"
                moz-do-not-send="true"><span
                  style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">bruno.decraene@orange.com</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><br>
                <b>Sent:</b> Tuesday, June 19, 2018 3:38 PM<br>
                <b>To:</b> Stewart Bryant &lt;</span><a
                href="mailto:stewart.bryant@gmail.com"
                moz-do-not-send="true"><span
                  style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">stewart.bryant@gmail.com</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">&gt;<br>
                <b>Cc:</b> SPRING WG List &lt;</span><a
                href="mailto:spring@ietf.org" moz-do-not-send="true"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">spring@ietf.org</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">&gt;;
                Rob Shakir &lt;</span><a
                href="mailto:robjs=40google.com@dmarc.ietf.org"
                moz-do-not-send="true"><span
                  style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">robjs=40google.com@dmarc.ietf.org</span></a><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">&gt;<br>
                <b>Subject:</b> Re: [spring] Updating the SPRING WG
                Charter<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p>Â </o:p></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif"
            lang="FR">Hi Stewart,</span><span lang="FR"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif"
            lang="FR">Â </span><span lang="FR"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">Speaking
            as individual contributor, please see inline [Bruno]</span><span
            lang="FR"><o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">Â </span><span
            lang="FR"><o:p></o:p></span></p>
        <div style="border:none;border-left:solid blue 1.5pt;padding:0in
          0in 0in 4.0pt">
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0in 0in 0in">
              <p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:windowtext"
                    lang="FR">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:windowtext"
                  lang="FR"> spring [</span><a
                  href="mailto:spring-bounces@ietf.org"
                  moz-do-not-send="true"><span
                    style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"
                    lang="FR">mailto:spring-bounces@ietf.org</span></a><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:windowtext"
                  lang="FR">]
                  <b>On Behalf Of </b>Stewart Bryant<br>
                  <b>Sent:</b> Tuesday, June 19, 2018 1:19 PM<br>
                  <br>
                </span><span lang="FR"><o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><span lang="FR">Â <o:p></o:p></span></p>
          <p><span lang="FR">Â <o:p></o:p></span></p>
          <p class="MsoNormal"><span lang="FR">Â <o:p></o:p></span></p>
          <div>
            <p class="MsoNormal"><span lang="FR">On 01/06/2018 17:05,
                Rob Shakir wrote:<o:p></o:p></span></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;" lang="FR">The
                  SPRING WG defines procedures that allow a node to
                  steer a packet through an</span><span lang="FR"><o:p></o:p></span></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;" lang="FR">SR
                  Policy instantiated as an ordered list of instructions
                  called segments
                </span><span style="font-family:&quot;Courier
                  New&quot;;color:red" lang="FR">and</span><span
                  lang="FR"><o:p></o:p></span></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Courier New&quot;;color:red"
                  lang="FR">without the need for per-path state
                  information to be held at transit nodes.</span><span
                  lang="FR"><o:p></o:p></span></p>
            </div>
          </blockquote>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              lang="FR"><br>
              I am not sure where the line gets drawn with the per-path
              state statement. If I introduce a<br>
              binding-SID to allow the creation of a path, have I
              introduced per-path state or not? In practise<br>
              a management entity will choose between the infinity of
              possible binding-SIDs by considering<br>
              the need to create specific paths and I would imagine that
              many will be instantiated just-in-time.<br>
              <br>
              I think that the key point is that the ingress creates the
              path by using SIDs to create<br>
              a concatenation of paths, policies and resources.<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">[Bruno]
              Agreed. And it can be argued that this creates a state on
              the ingress. An â€œoutgoingâ€ state, very roughly comparable
              to Next Hop Label Forwarding Entry (NHLFE))</span><span
              lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">However it
            could be argued that<br>
            as soon as we introduced Binding SIDs we introduced per-path
            state.<span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">[Bruno]
              Adding a Binding SID to this SR policy introduces an
              â€œincomingâ€ state, very roughly comparable to Incoming
              Label Map (ILM). But this gets additional benefit as it
              allows others SR nodes to use this state/SR policy.</span><span
              lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">Iâ€™m
              not sure that in such high level text, we need to make
              such distinction.</span><span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">I think we
            might<br>
            be best served by deleting the text I have highlighted.<br>
            <br>
            <span lang="FR"><o:p></o:p></span></p>
          <pre><span style="font-family:&quot;Arial&quot;,sans-serif;color:black">[Bruno] This text is mostly a copy/past from existing charter so is not really new:</span><span lang="FR"><o:p></o:p></span></pre>
          <pre><span style="font-family:&quot;Arial&quot;,sans-serif;color:black"> â€œ</span>allow a node to steer a packet along an explicit<span lang="FR"><o:p></o:p></span></pre>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext">Â  route using information
              attached to the packet and</span><span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext">Â  without the need for
              per-path state information to be</span><span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:windowtext">Â  held at transit nodes.
            </span><span
              style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">â€</span><span
              lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">Â <span
              lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">At high
            level, I believe that this is a key distinction of
            spring/segment routing hence worth keeping in the high level
            introduction of the WG.<span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">Now do we
            need to add text about more specific details, such as BSID?
            Iâ€™d rather not, as I donâ€™t see what this would bring. I also
            donâ€™t think that this sentence prohibits the creation of
            states when required/useful.<span lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt">--Bruno<span
              lang="FR"><o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
            - Stewart<br>
            <br>
            <br>
            <br>
            <br>
            <span lang="FR"><o:p></o:p></span></p>
        </div>
        <pre><span lang="FR">_________________________________________________________________________________________________________________________<o:p></o:p></span></pre>
        <pre><span lang="FR"><o:p>Â </o:p></span></pre>
        <pre><span lang="FR">Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span></pre>
        <pre><span lang="FR">pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span></pre>
        <pre><span lang="FR">a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o:p></span></pre>
        <pre><span lang="FR">Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
        <pre><span lang="FR"><o:p>Â </o:p></span></pre>
        <pre><span lang="FR">This message and its attachments may contain confidential or privileged information that may be protected by law;<o:p></o:p></span></pre>
        <pre><span lang="FR">they should not be distributed, used or copied without authorisation.<o:p></o:p></span></pre>
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        <pre><span lang="FR">Thank you.<o:p></o:p></span></pre>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext"><br>
___________________________________________________________________________<br>
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            This e-mail message is intended for the recipient only and
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To: Robert Raszuk <robert@raszuk.net>
Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, Xiejingrong <xiejingrong@huawei.com>, Michael McBride <michael.mcbride@huawei.com>, Rob Shakir <robjs=40google.com@dmarc.ietf.org>, Paul Mattes <pamattes@microsoft.com>, "Zafar Ali (zali)" <zali@cisco.com>, Eric C Rosen <erosen@juniper.net>, "Voyer, Daniel" <daniel.voyer@bell.ca>
References: <8CCB28152EA2E14A96BBEDC15823481A1CB79F12@sjceml521-mbs.china.huawei.com> <CA+b+ER=UknPNDweStHDXvbsuqkL2+r5=5zzS4ujAredew_F_vQ@mail.gmail.com> <DB5PR0301MB19094268D61209CFB345DE609D7B0@DB5PR0301MB1909.eurprd03.prod.outlook.com> <CA+b+ER=WX6WOxM7BhiysZxY39dNYYAHwT2hemR-tD+PLGi+KiQ@mail.gmail.com> <DM5PR21MB018696A5159598D791C30830CA7B0@DM5PR21MB0186.namprd21.prod.outlook.com> <DB5PR0301MB19091032724ED7EDC11F63659D7B0@DB5PR0301MB1909.eurprd03.prod.outlook.com> <CA+b+ERmzd1SjX4VqONwQGcUuD7rjuzx1zXb1nE3AyHWErBhMRw@mail.gmail.com> <DB5PR0301MB1909DA951760E8B7A6477EF09D7A0@DB5PR0301MB1909.eurprd03.prod.outlook.com> <CA+b+ER=p=qAAp0um4HBtecu23z_csNusViuoeMSadm0s5oyzsQ@mail.gmail.com> <DB5PR0301MB190937574F92F7314291FA129D790@DB5PR0301MB1909.eurprd03.prod.outlook.com> <CA+b+ERkXj4PHmUBAscG7dp-NFFr+iBUz_ya9X85jRdwpZ8kOyw@mail.gmail.com> <c1973e20-5a85-359f-b2ac-5eb7e602a68e@gmail.com> <CA+b+ERmwVHrohaH8BUam4yAraH3_hbE-7zGYxiuSZg_6Ps+OFA@mail.gmail.com>
From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Tue, 19 Jun 2018 17:06:06 +0100
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Subject: Re: [spring] Updating the SPRING WG Charter
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Hi Robert,

OK, so I understand this a bit more.

Yes, we could introduce a m/c tree in the middle of the network and have 
the leaves terminate in anything. That would include an SR unicast path 
and/or a new m/c tree or any combination thereof. What you have to do is 
to place the correct binding SID at the leaf of the tree which of course 
would be unique to that leaf, and identified by the m/c tree it arrived on.

So by adding in state through a generalised Binding SID mechanism we can 
build a full multicast system strictly within SR.

Sounds like it needs to be in charter.

- Stewart


On 19/06/2018 14:39, Robert Raszuk wrote:
> Hi Stewart,
>
> Nope that would be incorrect assumption.
>
> Replication anchors would be where topologically it makes sense. And 
> there may not be at all any multicast trees those subject flows would 
> need to traverse. It is just about efficiency in content distribution.
>
> Regards,
> R.
>
> On Tue, Jun 19, 2018 at 3:36 PM, Stewart Bryant 
> <stewart.bryant@gmail.com <mailto:stewart.bryant@gmail.com>> wrote:
>
>     For clarification:
>
>     Can I assume that we are talking about replication at ingress to a
>     series ofÂ  unicast SR paths each to an installed multicast tree
>     close to egress?
>
>     - Stewart
>
>
>     On 10/06/2018 10:58, Robert Raszuk wrote:
>>     Hey Sasha,
>>
>>     100% agree with your last post. Very glad to see your support for
>>     spray/fan-out or if you will
>>     static MDTs to be in scope of SPRING.
>>
>>     Based on number of WG members input expressed both at the meeting
>>     and on the listÂ  I hope
>>     proposed SPRING charter will be updated soon to reflect that.
>>
>>     Cheers,
>>     R.
>>
>>     â€‹PS. Btw - I am also ok that ingress replication is not relevant
>>     to SPRING as it essentially happens at the
>>     ingress to the domain. â€‹
>>
>>
>>
>>     On Sun, Jun 10, 2018 at 7:39 AM, Alexander Vainshtein
>>     <Alexander.Vainshtein@ecitele.com
>>     <mailto:Alexander.Vainshtein@ecitele.com>> wrote:
>>
>>         Robert,
>>
>>         First of all, I did not say that your quote was inaccurate. I
>>         apologize for possible misperception.
>>
>>         Second, I believe that spray or fan-out (meaning support of
>>         externally computed static MDTs) in SR-MPLS is a relevant
>>         focus area for the future WG work. Of course the solution
>>         must be aligned with the SPRING and MPLS architecture, and
>>         this imposes additional restrictions on how such a solution
>>         would look.
>>
>>         Last but not least, I have differentiated (from my first
>>         email on this thread) */ingress replication/* *in SR* from
>>         the more generic *multicast support *in SR:
>>
>>         -The latter is quite acceptable to me
>>
>>         -The former, IMHO, should be left out of scope.
>>
>>         Hope this helps to clarify my position.
>>
>>         Regards, and, again, apologies for possible misinterpretation.
>>
>>         Sasha
>>
>>
>>
>>     _______________________________________________
>>     spring mailing list
>>     spring@ietf.org <mailto:spring@ietf.org>
>>     https://www.ietf.org/mailman/listinfo/spring
>>     <https://www.ietf.org/mailman/listinfo/spring>
>
>


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    <p>Hi Robert,</p>
    <p>OK, so I understand this a bit more.
    </p>
    <p>Yes, we could introduce a m/c tree in the middle of the network
      and have the leaves terminate in anything. That would include an
      SR unicast path and/or a new m/c tree or any combination thereof.
      What you have to do is to place the correct binding SID at the
      leaf of the tree which of course would be unique to that leaf, and
      identified by the m/c tree it arrived on.<br>
    </p>
    <p>So by adding in state through a generalised Binding SID mechanism
      we can build a full multicast system strictly within SR.</p>
    <p>Sounds like it needs to be in charter.<br>
    </p>
    <p>- Stewart<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 19/06/2018 14:39, Robert Raszuk
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CA+b+ERmwVHrohaH8BUam4yAraH3_hbE-7zGYxiuSZg_6Ps+OFA@mail.gmail.com">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Hi
          Stewart,</div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Nope
          that would be incorrect assumption.Â </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Replication
          anchors would be where topologically it makes sense. And there
          may not be at all any multicast trees those subject flows
          would need to traverse. It is just about efficiency in content
          distribution.Â </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
        </div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>
        <div class="gmail_default"
          style="font-family:arial,helvetica,sans-serif;font-size:small">R.</div>
        <div class="gmail_extra"><br>
          <div class="gmail_quote">On Tue, Jun 19, 2018 at 3:36 PM,
            Stewart Bryant <span dir="ltr">&lt;<a
                href="mailto:stewart.bryant@gmail.com" target="_blank"
                moz-do-not-send="true">stewart.bryant@gmail.com</a>&gt;</span>
            wrote:<br>
            <blockquote class="gmail_quote" style="margin:0 0 0
              .8ex;border-left:1px #ccc solid;padding-left:1ex">
              <div text="#000000" bgcolor="#FFFFFF">
                <p>For clarification:</p>
                <p>Can I assume that we are talking about replication at
                  ingress to a series ofÂ  unicast SR paths each to an
                  installed multicast tree close to egress?</p>
                <span class="HOEnZb"><font color="#888888">
                    <p>- Stewart<br>
                    </p>
                  </font></span>
                <div>
                  <div class="h5"> <br>
                    <div class="m_-1013065469322969916moz-cite-prefix">On
                      10/06/2018 10:58, Robert Raszuk wrote:<br>
                    </div>
                  </div>
                </div>
                <blockquote type="cite">
                  <div>
                    <div class="h5">
                      <div dir="ltr">
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">Hey
                          Sasha,<br>
                        </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                        </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">100%
                          agree with your last post. Very glad to see
                          your support for spray/fan-out or if you willÂ </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">static
                          MDTs to be in scope of SPRING.Â </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                        </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">Based
                          on number of WG members input expressed both
                          at the meeting and on the listÂ  I hope</div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">proposed
                          SPRING charter will be updated soon to reflect
                          that.Â </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
                        </div>
                        <div
                          style="font-family:arial,helvetica,sans-serif;font-size:small">Cheers,<br>
                          R.</div>
                        <div class="gmail_extra"><br>
                        </div>
                        <div class="gmail_extra">
                          <div
                            style="font-family:arial,helvetica,sans-serif;font-size:small">â€‹PS.
                            Btw - I am also ok that ingress replication
                            is not relevant to SPRING as it essentially
                            happens at theÂ </div>
                          <div
                            style="font-family:arial,helvetica,sans-serif;font-size:small">ingress
                            to the domain. â€‹</div>
                          <br>
                        </div>
                        <div class="gmail_extra"><br>
                        </div>
                        <div class="gmail_extra"><br>
                          <div class="gmail_quote">On Sun, Jun 10, 2018
                            at 7:39 AM, Alexander Vainshtein <span
                              dir="ltr">&lt;<a
                                href="mailto:Alexander.Vainshtein@ecitele.com"
                                target="_blank" moz-do-not-send="true">Alexander.Vainshtein@ecitele.<wbr>com</a>&gt;</span>
                            wrote:<br>
                            <blockquote class="gmail_quote"
                              style="margin:0 0 0 .8ex;border-left:1px
                              #ccc solid;padding-left:1ex">
                              <div link="blue" vlink="purple"
                                lang="EN-US">
                                <div
                                  class="m_-1013065469322969916m_8781384223204297339WordSection1">
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Robert,</span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">First
                                      of all, I did not say that your
                                      quote was inaccurate. I apologize
                                      for possible misperception.</span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Second,
                                      I believe that spray or fan-out
                                      (meaning support of externally
                                      computed static MDTs) in SR-MPLS
                                      is a relevant focus area for the
                                      future WG work. Of course the
                                      solution must be aligned with the
                                      SPRING and MPLS architecture, and
                                      this imposes additional
                                      restrictions on how such a
                                      solution would look. </span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Last
                                      but not least, I have
                                      differentiated (from my first
                                      email on this thread) <b><i>ingress
                                          replication</i></b> <b>in SR</b>
                                      from the more generic <b>multicast
                                        support </b>in SR:</span></p>
                                  <p
                                    class="m_-1013065469322969916m_8781384223204297339MsoListParagraph"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>-<span
                                          style="font:7.0pt &quot;Times
                                          New Roman&quot;">Â Â Â Â Â Â Â Â Â  </span></span></span><span
                                      dir="LTR"></span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The
                                      latter is quite acceptable to me</span></p>
                                  <p
                                    class="m_-1013065469322969916m_8781384223204297339MsoListParagraph"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>-<span
                                          style="font:7.0pt &quot;Times
                                          New Roman&quot;">Â Â Â Â Â Â Â Â Â  </span></span></span><span
                                      dir="LTR"></span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The
                                      former, IMHO, should be left out
                                      of scope. </span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hope
                                      this helps to clarify my position.</span></p>
                                  <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Regards,
                                      and, again, apologies for possible
                                      misinterpretation.</span></p>
                                  <span>
                                    <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Â </span></p>
                                    <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Sasha</span></p>
                                  </span></div>
                              </div>
                            </blockquote>
                          </div>
                        </div>
                      </div>
                      <br>
                      <fieldset
                        class="m_-1013065469322969916mimeAttachmentHeader"></fieldset>
                      <br>
                    </div>
                  </div>
                  <span class="">
                    <pre>______________________________<wbr>_________________
spring mailing list
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</pre>
                  </span></blockquote>
                <br>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
      </div>
    </blockquote>
    <br>
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Subject: Re: [spring] A question about Mirror SID and its advertisement using IS-IS
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Sasha -

Thanx for pointing this out.

Up until V13 of the draft the SID/Label Binding TLV had multiple use cases =
and there was introductory text in Section 2.4 which described these use ca=
ses.
All use cases other than SRMS were removed in V13 (principally the ERO type=
s) as they were not in use and the introductory text was removed.

Support for Mirror SID was restored in V14 (thanx to Chris Bowers) but we n=
ever updated the introductory text in Section 2.4 to reflect this.

Attached are proposed diffs to address this gap. Hopefully this will resolv=
e the issue for you.

   Les


From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Tuesday, June 19, 2018 7:27 AM
To: draft-ietf-isis-segment-routing-extensions.all@ietf.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; spring@ietf.org;=
 lsr@ietf.org
Subject: A question about Mirror SID and its advertisement using IS-IS

Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https:=
//tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its a=
dvertisement defined in the IS-IS extensions for SR<https://datatracker.iet=
f.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follow=
ing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#sectio=
n-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https:=
//tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-isi=
s-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any =
such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror co=
ntext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-=
17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/html=
/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segment-=
routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension=
s-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org/=
html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segm=
ent-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to =
the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Con=
text SID is a segment that identifies the node, and not any prefix. And, of=
 course the SR Architecture draft does not describe usage of any flags.

What (if anything) did I miss?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha &#8211;<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanx for pointing thi=
s out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Up until V13 of the dr=
aft the SID/Label Binding TLV had multiple use cases and there was introduc=
tory text in Section 2.4 which described these use cases.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">All use cases other th=
an SRMS were removed in V13 (principally the ERO types) as they were not in=
 use and the introductory text was removed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Support for Mirror SID=
 was restored in V14 (thanx to Chris Bowers) but we never updated the intro=
ductory text in Section 2.4 to reflect this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Attached are proposed =
diffs to address this gap. Hopefully this will resolve the issue for you.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp; Les<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;Alexander.Vain=
shtein@ecitele.com&gt;
<br>
<b>Sent:</b> Tuesday, June 19, 2018 7:27 AM<br>
<b>To:</b> draft-ietf-isis-segment-routing-extensions.all@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; spr=
ing@ietf.org; lsr@ietf.org<br>
<b>Subject:</b> A question about Mirror SID and its advertisement using IS-=
IS<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about Mirror SID as defined in the=
 <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"h=
ttps://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/=
">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Archi=
tecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;mso-line-height-alt:0pt">
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15=
#section-5.1"><b><span style=3D"font-size:10.0pt;font-family:&quot;Courier =
New&quot;;color:black">5.1</span></b></a><a name=3D"section-5.1"></a><b><sp=
an style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:blac=
k">.&nbsp;
 IGP Mirroring Context Segment<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; One use case for a Binding Segmen=
t is to provide support for an IGP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability to =
process traffic originally destined<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the M=
irrored node and identified by an IP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided t=
hat a &quot;Mirroring Context&quot; segment be<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list prio=
r to any service segment local to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.<o:p></o:p></sp=
an></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to =
provide egress node A protection, it<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identify=
ing node's A context.&nbsp; Such segment is<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context S=
egment&quot; and identified by the Mirror SID.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised =
using the binding segment defined in SR<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a h=
ref=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref=
-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensions =
for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>] .<=
o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a =
point of local repair (PLR) diverting<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a PU=
SH of the Mirror SID on the protected<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when receiv=
ing the traffic with the Mirror SID as the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that seg=
ment and processes underlying segments<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.<o:p></o:=
p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <s=
pan style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft =
only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#section-2.4"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4</spa=
n></a><a name=3D"section-2.4"></a><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;;color:black">.&nbsp;
 SID/Label Binding TLV<o:p></o:p></span></h3>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MAY=
 be originated by any router in an IS-IS<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:yel=
low;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise pr=
efixes to SID/Label<o:p></o:p></span></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&nb=
sp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routing =
Mapping<o:p></o:p></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&nb=
sp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The behav=
ior of the SRMS is defined in<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.iet=
f.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-sprin=
g-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworking =
with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].<o:p></o:p=
></span></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#section-2.4.1"><span style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4.1=
</span></a><a name=3D"section-2.4.1"></a><span style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:black">.&nbsp;
 Flags<o:p></o:p></span></h4>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of follo=
wing flags:<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp;=
&nbsp; |<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:<o:p></o:p></span></pre=
>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Add=
ress Family flag.&nbsp; If unset, then the Prefix carries an<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefix=
.&nbsp; If set then the Prefix carries an IPv6 Prefix.<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mir=
ror Context flag.&nbsp; Set if the advertised SID<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; corresponds=
 to a mirrored context.&nbsp; The use of the M flag is<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described i=
n [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-e=
xtensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment Ro=
uting Architecture&quot;">I-D.ietf-spring-segment-routing</a>].<o:p></o:p><=
/span></pre>
<pre><span style=3D"color:black">...<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is related=
 to the SRMS &#8211; but, to the best of my understanding, these are comple=
tely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft says=
 that the Mirroring Context SID is a segment that identifies the node, and =
not any prefix. And, of course the SR Architecture draft does not describe =
usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
<br>
transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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and all copies thereof.<br>
___________________________________________________________________________=
<o:p></o:p></span></p>
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--_004_7aaaddfdb34049b2961cdb44b1c1eb86XCHALN001ciscocom_--


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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Rob Shakir <robjs@google.com>, SPRING WG List <spring@ietf.org>
Thread-Topic: Do you consider "steering large portion of a SD-WAN path over SR domain" as the "application" in the SPRING charter?  RE: [spring] Updating the SPRING WG Charter
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Date: Tue, 19 Jun 2018 23:05:19 +0000
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Subject: [spring] Do you consider "steering large portion of a SD-WAN path over SR domain" as the "application" in the SPRING charter? RE: Updating the SPRING WG Charter
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: IETF 102 - SPRING meeting
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Hi Bruno,

I would like to get a 10 minute slot to present   https://www.ietf.org/inte=
rnet-drafts/draft-dunbar-sr-sdwan-over-hybrid-networks-01.txt

Speaker will be myself.

Thanks!

Linda Dunbar

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com<mailto:bruno.decraene@orange.com>
Sent: Monday, June 18, 2018 6:30 AM
To: spring@ietf.org<mailto:spring@ietf.org>
Subject: [spring] IETF 102 - SPRING meeting


Hi all,



During IETF 102, the SPRING WG is currently scheduled to meet Monday 13:30-=
15:30. We have a two hours session.
https://datatracker.ietf.org/meeting/102/agenda.html


It is time start building the SPRING WG agenda for Montreal.

Please send your request for a presentation slot, indicating draft name, sp=
eaker, and desired duration (covering presentation and discussion), before =
Monday 2018-07-02  09:00 CET. Before is better.

If it is not the first presentation of a non-WG draft, please give a reason=
 why it is required to have a new presentation slot.

A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik=
i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting



As we are meeting on Monday, please send your slides on time, before Sunday=
 18:00 local time. Earlier is better.


Thanks,
--Bruno, Rob

___________________________________________________________________________=
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<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Bruno,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I would like to get a =
10 minute slot to present &nbsp;</span>&nbsp;<a href=3D"https://www.ietf.or=
g/internet-drafts/draft-dunbar-sr-sdwan-over-hybrid-networks-01.txt"><span =
style=3D"color:#0563C1">https://www.ietf.org/internet-drafts/draft-dunbar-s=
r-sdwan-over-hybrid-networks-01.txt</span></a><span style=3D"color:#1F497D"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Speaker will be myself=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks!<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Linda Dunbar<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring [<a href=3D"mailto:spring-bounce=
s@ietf.org">mailto:spring-bounces@ietf.org</a>]
<b>On Behalf Of </b><a href=3D"mailto:bruno.decraene@orange.com">bruno.decr=
aene@orange.com</a><br>
<b>Sent:</b> Monday, June 18, 2018 6:30 AM<br>
<b>To:</b> <a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<b>Subject:</b> [spring] IETF 102 - SPRING meeting<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">Hi all,<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">During IETF 102, the SPRING WG is currently scheduled to meet Monday =
13:30-15:30. We have a two hours session.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><a href=3D"https://datatracker.ietf.org/meeting/102/a=
genda.html">https://datatracker.ietf.org/meeting/102/agenda.html</a><o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText">It is time start building the SPRING WG agenda fo=
r Montreal.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please send your request for a presentation slot,=
 indicating draft name, speaker, and desired duration (covering presentatio=
n and discussion), before Monday 2018-07-02 &nbsp;09:00 CET. Before is bett=
er.
<o:p></o:p></p>
<p class=3D"MsoPlainText">If it is not the first presentation of a non-WG d=
raft, please give a reason why it is required to have a new presentation sl=
ot.<o:p></o:p></p>
<p class=3D"MsoPlainText">A checklist is available on the wiki: <a href=3D"=
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting">
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As we are meeting on Monday, please send your sli=
des on time, before Sunday 18:00 local time. Earlier is better.<o:p></o:p><=
/p>
<pre><o:p>&nbsp;</o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">--Bruno, Rob<o:p></o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
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<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
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<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
</div>
</body>
</html>

--_000_4A95BA014132FF49AE685FAB4B9F17F66B071700sjceml521mbschi_--


From nobody Tue Jun 19 23:12:41 2018
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From: Adam Roach <adam@nostrum.com>
To: "The IESG" <iesg@ietf.org>
Cc: draft-ietf-spring-segment-routing-ldp-interop@ietf.org, Rob Shakir <robjs@google.com>, aretana.ietf@gmail.com, spring-chairs@ietf.org,  robjs@google.com, spring@ietf.org
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Subject: [spring] Adam Roach's No Objection on draft-ietf-spring-segment-routing-ldp-interop-13: (with COMMENT)
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Adam Roach has entered the following ballot position for
draft-ietf-spring-segment-routing-ldp-interop-13: No Objection

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email addresses included in the To and CC lines. (Feel free to cut this
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I might have missed something; and note that this is offered as an
observation, and is explicitly not a blocking comment: this document appears
to offer operational advice for co-existence of LDP and SR, and for
transitioning from LDP to SR in an incremental fashion. I don't see any
protocol specification in here. Based on these observations, it is my opinion
that the contents of this document seem better suited for publication as a BCP
rather than a standards track document. For example: if one were to eventually
progress this document to an Internet Standard, what "implementations" would
one use to evaluate the criteria in section 2.2 of RFC 6140? If we can't
answer that question, I think it's a pretty clear indication that the document
isn't standards track.

---------------------------------------------------------------------------

General:

This document uses IPv4 addresses for example purposes in many places. Please
convert these to IPv6 or a mix of IPv4 and IPv6 addresses. See
https://www.iab.org/documents/correspondence-reports-documents/2016-2/iab-statement-on-ipv6/
for additional information.

---------------------------------------------------------------------------

>  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>  "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
>  document are to be interpreted as described in RFC 2119 [RFC2119].

This document uses non-normative, lowercased versions of these words in several
locations. Please update this section to match the boilerplate in RFC 8174.

---------------------------------------------------------------------------

Â§3.1.1:

>  A SR node having LDP neighbors MUST create LDP bindings for each
>  Prefix-SID learned in the SR domain by treating SR learned labels as
>  if they were learned through an LDP neighbot.

Nit: "...neighbor."



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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions.all@ietf.org" <draft-ietf-isis-segment-routing-extensions.all@ietf.org>
Thread-Topic: A question about Mirror SID and its advertisement using IS-IS
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/Qb9JfO5J9MLnEVlh320CPTD9Qug>
Subject: Re: [spring] A question about Mirror SID and its advertisement using IS-IS
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Les,
Lots of thanks for a prompt response.
The proposed text looks fine to me.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Tuesday, June 19, 2018 11:00 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draft-ietf-is=
is-segment-routing-extensions.all@ietf.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; spring@ietf.org=
; lsr@ietf.org
Subject: RE: A question about Mirror SID and its advertisement using IS-IS=


Sasha -

Thanx for pointing this out.

Up until V13 of the draft the SID/Label Binding TLV had multiple use cases=
 and there was introductory text in Section 2.4 which described these use =
cases.
All use cases other than SRMS were removed in V13 (principally the ERO typ=
es) as they were not in use and the introductory text was removed.

Support for Mirror SID was restored in V14 (thanx to Chris Bowers) but we =
never updated the introductory text in Section 2.4 to reflect this.

Attached are proposed diffs to address this gap. Hopefully this will resol=
ve the issue for you.

   Les


From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, June 19, 2018 7:27 AM
To: draft-ietf-isis-segment-routing-extensions.all@ietf.org<mailto:draft-i=
etf-isis-segment-routing-extensions.all@ietf.org>
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com<mailto:Michael.Go=
rokhovsky@ecitele.com>>; spring@ietf.org<mailto:spring@ietf.org>; lsr@ietf=
.org<mailto:lsr@ietf.org>
Subject: A question about Mirror SID and its advertisement using IS-IS

Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its=
 advertisement defined in the IS-IS extensions for SR<https://datatracker.=
ietf.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follo=
wing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#secti=
on-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-i=
sis-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any=
 such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror c=
ontext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions=
-17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segmen=
t-routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensio=
ns-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org=
/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-se=
gment-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to=
 the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Co=
ntext SID is a segment that identifies the node, and not any prefix. And, =
of course the SR Architecture draft does not describe usage of any flags.

What (if anything) did I miss?

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecit=
ele.com>


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Les,<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Lots of thanks for a =
prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The proposed text loo=
ks fine to me.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Les Ginsberg (ginsberg) [mailto:ginsbe=
rg@cisco.com]
<br>
<b>Sent:</b> Tuesday, June 19, 2018 11:00 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
draft-ietf-isis-segment-routing-extensions.all@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; sp=
ring@ietf.org; lsr@ietf.org<br>
<b>Subject:</b> RE: A question about Mirror SID and its advertisement usin=
g IS-IS<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha &#8211;</span><=
o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanx for pointing th=
is out.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Up until V13 of the d=
raft the SID/Label Binding TLV had multiple use cases and there was introd=
uctory text in Section 2.4 which described these use cases.</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">All use cases other t=
han SRMS were removed in V13 (principally the ERO types) as they were not =
in use and the introductory text was removed.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Support for Mirror SI=
D was restored in V14 (thanx to Chris Bowers) but we never updated the int=
roductory text in Section 2.4 to reflect this.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Attached are proposed=
 diffs to address this gap. Hopefully this will resolve the issue for you.=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp; Les</spa=
n><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm=
 4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, June 19, 2018 7:27 AM<br>
<b>To:</b> <a href=3D"mailto:draft-ietf-isis-segment-routing-extensions.al=
l@ietf.org">
draft-ietf-isis-segment-routing-extensions.all@ietf.org</a><br>
<b>Cc:</b> Michael Gorokhovsky &lt;<a href=3D"mailto:Michael.Gorokhovsky@e=
citele.com">Michael.Gorokhovsky@ecitele.com</a>&gt;;
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; <a href=3D"mailto:=
lsr@ietf.org">
lsr@ietf.org</a><br>
<b>Subject:</b> A question about Mirror SID and its advertisement using IS=
-IS<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about Mirror SID as defined in th=
e <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing=
-15">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"=
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extension=
s/">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Arch=
itecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-line-height-alt:0pt">
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5#section-5.1"><b><span style=3D"font-size:10.0pt;font-family:&quot;Courie=
r New&quot;;color:black">5.1</span></b></a><a name=3D"section-5.1"></a><b>=
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:=
black">.&nbsp;
 IGP Mirroring Context Segment</span></b><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; One use case for a Binding Segm=
ent is to provide support for an IGP</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability t=
o process traffic originally destined</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the=
 Mirrored node and identified by an IP</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided=
 that a &quot;Mirroring Context&quot; segment be</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list pr=
ior to any service segment local to</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.</span><o:p><=
/o:p></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to=
 provide egress node A protection, it</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identif=
ying node's A context.&nbsp; Such segment is</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context =
Segment&quot; and identified by the Mirror SID.</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised=
 using the binding segment defined in SR</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#r=
ef-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensio=
ns for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>=
] .</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a=
 point of local repair (PLR) diverting</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a P=
USH of the Mirror SID on the protected</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when recei=
ving the traffic with the Mirror SID as the</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that se=
gment and processes underlying segments</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.</span><=
o:p></o:p></pre>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <=
span style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft=
 only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extensions-17#section-2.4"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4</sp=
an></a><a name=3D"section-2.4"></a><span style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:black">.&nbsp;
 SID/Label Binding TLV</span><o:p></o:p></h3>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MA=
Y be originated by any router in an IS-IS</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.</span><o:p></o:p></p=
re>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:ye=
llow;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise =
prefixes to SID/Label</span></span><o:p></o:p></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routin=
g Mapping</span><o:p></o:p></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The beh=
avior of the SRMS is defined in</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.ie=
tf.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spr=
ing-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworki=
ng with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].</span=
><o:p></o:p></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extensions-17#section-2.4.1"><span styl=
e=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4=
.1</span></a><a name=3D"section-2.4.1"></a><span style=3D"font-size:10.0pt=
;font-family:&quot;Courier New&quot;;color:black">.&nbsp;
 Flags</span><o:p></o:p></h4>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of foll=
owing flags:</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7</span>=
<o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp=
;&nbsp; |</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:</span><o:p></o:p></pr=
e>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Ad=
dress Family flag.&nbsp; If unset, then the Prefix carries an</span><o:p><=
/o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefi=
x.&nbsp; If set then the Prefix carries an IPv6 Prefix.</span><o:p></o:p><=
/pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mi=
rror=20Context flag.&nbsp; Set if the advertised SID</span><o:p></o:p></pr=
e>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; correspond=
s to a mirrored context.&nbsp; The use of the M flag is</span><o:p></o:p><=
/pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described =
in [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing=
-extensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment=
 Routing Architecture&quot;">I-D.ietf-spring-segment-routing</a>].</span><=
o:p></o:p></pre>
<pre><span style=3D"color:black">...</span><o:p></o:p></pre>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is relate=
d to the SRMS &#8211; but, to the best of my understanding, these are comp=
letely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft say=
s that the Mirroring Context SID is a segment that identifies the node, an=
d not any prefix. And, of course the SR Architecture draft does not descri=
be usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
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Hi Loa,

I'm not aware of any IPRs related to this document.

Best Regards
Shaowen Ma

On Thu, Jun 7, 2018 at 6:15 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
> /Loa
>  mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
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<div dir=3D"ltr"><div><span style=3D"font-family:trebuchet ms,sans-serif">H=
i Loa,</span></div><div><span style=3D"font-family:trebuchet ms,sans-serif"=
><br></span></div><div><span style=3D"font-family:trebuchet ms,sans-serif">=
I&#39;m not aware of any IPRs related to this document.<br></span>
<span style=3D"font-family:trebuchet ms,sans-serif"><br></span></div><div><=
span style=3D"font-family:trebuchet ms,sans-serif">Best Regards</span></div=
><div><span style=3D"font-family:trebuchet ms,sans-serif">Shaowen Ma</span>=
<br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">O=
n Thu, Jun 7, 2018 at 6:15 PM, Loa Andersson <span dir=3D"ltr">&lt;<a href=
=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;</span> wrote:<br>=
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Working Group,<br>
<br>
We are currently preparing draft draft-xu-mpls-sr-over-ip for working<br>
group adoption.<br>
<br>
Part of this preparation is to do an IPR poll.<br>
<br>
This mail is to start the IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.<br=
>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS WG mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
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contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
We have copied this mail to the SPRING wg mailing list for information.<br>
If you receive this mail over the SPRING wg mailing list, and are aware<br>
of IPRs that apply to the draft, please notify the MPLS wg list.<br>
<br>
<br>
/Loa<br>
=C2=A0mpls wg co-chair<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
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</font></span></blockquote></div><br></div>

--0000000000006fe11a056f13d4a6--


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Subject: [spring] Alissa Cooper's No Objection on draft-ietf-spring-segment-routing-ldp-interop-13: (with COMMENT)
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Alissa Cooper has entered the following ballot position for
draft-ietf-spring-segment-routing-ldp-interop-13: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

As a non-specialist I found the organization of 3.2, 3.2.1, and 3.2.2 a little
hard to follow, as it seemed to me like the SRMS section should have been
introduced first before the discussion of the SR to LDP flow and behavior.

Section 7 says:

"The security associated with these advertisement is
   part of the security applied to routing protocols such as IS-IS
   [RFC5304] and OSPF [RFC5709] which both make use of cryptographic
   authentication mechanisms."

Unless the use of the cited cryptographic authentication mechanisms is required
when using these label advertisements, I would suggest saying "which both
optionally make use of." Otherwise this seems a little misleading.



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Joel, thanks for your reviews. Ahmed, thanks for your response. I =
entered a No Objection ballot.=20

Alissa


> On Jun 7, 2018, at 5:40 PM, Joel Halpern <jmh@joelhalpern.com> wrote:
>=20
> Reviewer: Joel Halpern
> Review result: Ready
>=20
> I am the assigned Gen-ART reviewer for this draft. The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair. Please wait for direction from your
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>=20
> For more information, please see the FAQ at
>=20
> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>=20
> Document: draft-ietf-spring-segment-routing-ldp-interop-12
> Reviewer: Joel Halpern
> Review Date: 2018-06-07
> IETF LC End Date: 2018-05-24
> IESG Telechat date: 2018-06-21
>=20
> Summary: This document is ready to be published as a Proposed Standard
>=20
> The authors' additions of material to explain the SRMS both addresses =
by
> earlier concerns and provides sufficient motivation for publishing =
this as a
> PS.  My thanks to the authors for their work.
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

I may be missing something, but I don't see anything that says whether the
preference field introduced in Section 3.2.3 uses larger values or smaller
values for more-preferred SRMSes.

The introduction of the SRMS is also introducing a new way for a protocol
participant to make claims about route prefixes directed at "third parties"
(non-MS, non-MC routers).  While routing protocols in general do require high
levels of trust in all participants in order for proper routing to occur, this
addition seems to create a "first among equals" situation that could be called
out more clearly in the security considerations.  (I do appreciate that the
requirement for preferring SIDs advertised in prefix reachability
advertisements over those advertised in mapping server advertisements does help
alleviate some of the risk.)


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I support Alissa's suggestion about the text covering cryptographic authentication.

"[100,300]" and "(100,200)" are each used as an example SRGB.  In
some contexts the round versus square brackets indicate a
distinction between "closed" (includes endpoints) and "open" (does
not include endpoints) intervals.  If there's no need to make such a
distinction, I suggest standardizing one one format.

As was mentioned in the secdir review, it would be good to expand FEC and LFA on first usage.

Section 1

   Section 2 describes the co-existence of SR with other MPLS Control
   Plane. [...]

nit: "other MPLS Control Plane" seems to be an incomplete compound noun
-- is it other control plane technologies that are being considered?

Section 2

   Note that this static label allocation capability of the label
   manager exists for many years across several vendors and hence is not
   new.  Furthermore, note that the label-manager ability to statically
   allocate a range of labels to a specific application is not new
   either. [...]

nits: "has existed", "label-manager's ability".

Section 2.1

   MPLS2MPLS refers the forwarding behavior where a router receives an
   labeled packet and switches it out as a labeled packet.  Several

nit: "refers to", "a labeled packet"

Section 3.2

   This section defines the Segment Routing Mapping Server (SRMS).  The
   SRMS is a IGP node advertising mapping between Segment Identifiers
   (SID) and prefixes advertised by other IGP nodes.  The SRMS uses a
   dedicated IGP extension (IS-IS, OSPF and OSPFv3) which is protocol
   specific and defined in [I-D.ietf-isis-segment-routing-extensions],
   [I-D.ietf-ospf-segment-routing-extensions], and
   [I-D.ietf-ospf-ospfv3-segment-routing-extensions].

nit: Perhaps "IS-IS, OSPFv2, and OSPFv3 are currently supported" is a
better parenthetical?

   The example diagram depicted in Figure 3 assumes that the operator
   configures P5 to act as a Segment Routing Mapping Server (SRMS) and
   advertises the following mappings: (P7, 107), (P8, 108), (PE3, 103)
   and (PE4, 104).

nit: I think this is Figure 2.

Section 3.2.1

   [...] Examples
   of explicit prefix-SID advertisment are the prefix-SID sub-TLVs
   defined in ([I-D.ietf-isis-segment-routing-extensions],
   [I-D.ietf-ospf-segment-routing-extensions], and
   [I-D.ietf-ospf-ospfv3-segment-routing-extensions]).

Would draft-ietf-idr-bgp-prefix-sid (also on this week's telechat)
be appropriate for inclusion in this list?

   for that prefix.  Hence assigning a prefix-SID to a prefix using the
   SRMS functionality does not preclude assigning the same or different
   prefix-SID(s) to the same prefix using explict prefix-SID
   advertisement such as the aforementioned prefix-SID sub-TLV.

nit: I think the aforementioned things were a list, so "sub-TLVs" plural
would be appropriate.

Including the name for IS-IS TLV 135 might be helpful for the
reader.



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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Hi Bruno,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">I=A1=AFd like to request for 15 minute=
s to present the update of draft-dong-spring-sr-for-enhanced-vpn. Speaker w=
ill be myself. Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN">Jie<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D;mso-fareast-language:ZH-CN"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN">=B7=A2=BC=FE=C8=CB<s=
pan lang=3D"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-fa=
mily:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;mso-fareast-language:Z=
H-CN"> spring [mailto:spring-bounces@ietf.org]
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif;mso-fareast-language:ZH-CN">=B4=FA=B1=ED
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN">bruno.decraene@orang=
e.com<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif;mso-fareast-language:ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D=
"EN-US">:</span></span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;mso-fareast-language:ZH-CN"> 2018=
</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans=
-serif;mso-fareast-language:ZH-CN">=C4=EA<span lang=3D"EN-US">6</span>=D4=
=C2<span lang=3D"EN-US">18</span>=C8=D5<span lang=3D"EN-US">
 18:30<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> spring@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> [spring] IETF 102 - SPRING meeting<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif">Hi all,<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif">During IETF 102, the SPRING WG is currently scheduled =
to meet Monday 13:30-15:30. We have a two hours session.<o:p></o:p></span><=
/pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/meeting/102/agenda.html"><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Arial&quot;,sans-serif">https://datatracker.ietf.org/meeting/102/a=
genda.html</span></a></span><span lang=3D"EN-US" style=3D"font-size:10.0pt;=
font-family:&quot;Arial&quot;,sans-serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">It is time start building th=
e SPRING WG agenda for Montreal.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Please send your request for=
 a presentation slot, indicating draft name, speaker, and desired duration =
(covering presentation and discussion), before Monday 2018-07-02 &nbsp;09:0=
0 CET. Before is better.
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">If it is not the first prese=
ntation of a non-WG draft, please give a reason why it is required to have =
a new presentation slot.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">A checklist is available on =
the wiki: <a href=3D"https://trac.ietf.org/trac/spring/wiki/Checklist%20for=
%20presenting%20at%20a%20SPRING%20meeting">
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting</a><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">As we are meeting on Monday,=
 please send your slides on time, before Sunday 18:00 local time. Earlier i=
s better.<o:p></o:p></span></p>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,sans-serif">--Bruno, Rob<o:p></o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
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<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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From: Chris Bowers <chrisbowers.ietf@gmail.com>
Date: Fri, 22 Jun 2018 13:49:52 -0500
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To: Bruno Decraene <bruno.decraene@orange.com>
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Bruno and Rob,

I'd like to request a 10 minute time slot to discuss
draft-hegde-spring-node-protection-for-sr-te-paths.
I plan to present.

https://tools.ietf.org/html/draft-hegde-spring-node-protection-for-sr-te-paths-02

Thanks,
Chris


On Mon, Jun 18, 2018 at 5:30 AM, <bruno.decraene@orange.com> wrote:

> Hi all,
>
>
>
> During IETF 102, the SPRING WG is currently scheduled to meet Monday 13:30-15:30. We have a two hours session.
>
> https://datatracker.ietf.org/meeting/102/agenda.html
>
>
>
> It is time start building the SPRING WG agenda for Montreal.
>
> Please send your request for a presentation slot, indicating draft name,
> speaker, and desired duration (covering presentation and discussion),
> before Monday 2018-07-02  09:00 CET. Before is better.
>
> If it is not the first presentation of a non-WG draft, please give a
> reason why it is required to have a new presentation slot.
>
> A checklist is available on the wiki: https://trac.ietf.org/trac/
> spring/wiki/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting
>
>
>
> As we are meeting on Monday, please send your slides on time, before
> Sunday 18:00 local time. Earlier is better.
>
>
>
> Thanks,
>
> --Bruno, Rob
>
> _________________________________________________________________________________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged information that may be protected by law;
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> If you have received this email in error, please notify the sender and delete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.
> Thank you.
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>
>

--000000000000798fe4056f3f8004
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Bruno and Rob,</div><div><br></div><div>I&#39;d like =
to request a 10 minute time slot to discuss draft-hegde-spring-node-protect=
ion-for-sr-te-paths.</div><div>I plan to present.<br></div><div><br></div><=
div><a href=3D"https://tools.ietf.org/html/draft-hegde-spring-node-protecti=
on-for-sr-te-paths-02">https://tools.ietf.org/html/draft-hegde-spring-node-=
protection-for-sr-te-paths-02</a><br></div><div><br></div><div>Thanks,</div=
><div>Chris<br></div><div><br></div><div><div><div class=3D"gmail_extra"><b=
r><div class=3D"gmail_quote">On Mon, Jun 18, 2018 at 5:30 AM,  <span dir=3D=
"ltr">&lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">br=
uno.decraene@orange.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">





<div lang=3D"FR">
<div class=3D"gmail-m_1009652077774196027WordSection1">
<pre><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sa=
ns-serif&quot;" lang=3D"EN-US">Hi all,<u></u><u></u></span></pre>
<pre><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sa=
ns-serif&quot;" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<pre><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sa=
ns-serif&quot;" lang=3D"EN-US">During IETF 102, the SPRING WG is currently =
scheduled to meet Monday 13:30-15:30. We have a two hours session.<u></u><u=
></u></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Aria=
l&quot;,&quot;sans-serif&quot;" lang=3D"EN-US"><a href=3D"https://datatrack=
er.ietf.org/meeting/102/agenda.html" target=3D"_blank">https://datatracker.=
ietf.org/<wbr>meeting/102/agenda.html</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Aria=
l&quot;,&quot;sans-serif&quot;" lang=3D"EN-US"><u></u>=C2=A0<u></u></span><=
/p>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US">I=
t is time start building the SPRING WG agenda for Montreal.<u></u><u></u></=
span></p>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US">P=
lease send your request for a presentation slot, indicating draft name, spe=
aker, and desired duration (covering presentation and discussion), before M=
onday 2018-07-02 =C2=A009:00 CET. Before is better.
<u></u><u></u></span></p>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US">I=
f it is not the first presentation of a non-WG draft, please give a reason =
why it is required to have a new presentation slot.<u></u><u></u></span></p=
>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US">A=
 checklist is available on the wiki: <a href=3D"https://trac.ietf.org/trac/=
spring/wiki/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting" targe=
t=3D"_blank">
https://trac.ietf.org/trac/<wbr>spring/wiki/Checklist%20for%<wbr>20presenti=
ng%20at%20a%<wbr>20SPRING%20meeting</a><u></u><u></u></span></p>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US"><=
u></u>=C2=A0<u></u></span></p>
<p class=3D"gmail-m_1009652077774196027MsoPlainText"><span lang=3D"EN-US">A=
s we are meeting on Monday, please send your slides on time, before Sunday =
18:00 local time. Earlier is better.<u></u><u></u></span></p>
<pre><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Aria=
l&quot;,&quot;sans-serif&quot;" lang=3D"EN-US">Thanks,<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Aria=
l&quot;,&quot;sans-serif&quot;" lang=3D"EN-US">--Bruno, Rob<u></u><u></u></=
span></p>
</div>
<pre>______________________________<wbr>______________________________<wbr>=
______________________________<wbr>______________________________<wbr>_

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

<br>______________________________<wbr>_________________<br>
spring mailing list<br>
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/spring" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/spring</a><br=
>
<br></blockquote></div><br></div></div></div></div>

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Hi,

I am not aware of any IPR related to this draft,

Regards,
R.

On Thu, Jun 7, 2018 at 12:15 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> We are currently preparing draft draft-xu-mpls-sr-over-ip for working
> group adoption.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the MPLS WG mailing list.* The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the MPLS WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> We have copied this mail to the SPRING wg mailing list for information.
> If you receive this mail over the SPRING wg mailing list, and are aware
> of IPRs that apply to the draft, please notify the MPLS wg list.
>
>
> /Loa
>  mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Hi,</div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><=
div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif=
;font-size:small">I am not aware of any IPR related to this draft,=C2=A0</d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small">Regards,</div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">R.</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Thu, Jun 7, 2018 at 12:15 PM, Loa Andersson <span dir=3D"ltr">&lt;=
<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;</span> wro=
te:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex">Working Group,<br>
<br>
We are currently preparing draft draft-xu-mpls-sr-over-ip for working<br>
group adoption.<br>
<br>
Part of this preparation is to do an IPR poll.<br>
<br>
This mail is to start the IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-xu-mpls-sr-over-ip?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
There are currently no IPR disclosures against draft-xu-mpls-sr-over-ip.<br=
>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS WG mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
We have copied this mail to the SPRING wg mailing list for information.<br>
If you receive this mail over the SPRING wg mailing list, and are aware<br>
of IPRs that apply to the draft, please notify the MPLS wg list.<br>
<br>
<br>
/Loa<br>
=C2=A0mpls wg co-chair<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

--0000000000002edcde056f8f1b23--


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Thread-Topic: [spring] Updating the SPRING WG Charter
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: SPRING WG List <spring@ietf.org>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Thu, 28 Jun 2018 13:21:26 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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Bruno and all,
At the first glance looks just fine to me!

Thumb typed by Sasha Vainshtein

________________________________
From: spring <spring-bounces@ietf.org> on behalf of bruno.decraene@orange.=
com <bruno.decraene@orange.com>
Sent: Thursday, June 28, 2018 3:51:43 PM
To: SPRING WG List
Subject: Re: [spring] Updating the SPRING WG Charter

Hi SPRING,

Following the discussion on the mailing list, please find below the update=
d text.
The plan is to send it to Martin end of this week.

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home=
 of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG s=
erves as a forum to discuss SPRING networks operations, define new applica=
tions, and specify extensions of Segment Routing technologies.

The SPRING WG defines procedures that allow a node to steer a packet throu=
gh an SR Policy instantiated as an ordered list of instructions called seg=
ments and without the need for per-path state information to be held at tr=
ansit nodes. Full explicit control (through loose or strict path specifica=
tion) can be achieved in a network comprising only SPRING nodes, however S=
PRING nodes must inter-operate through loose routing in existing networks =
and may find it advantageous to use loose routing for other network applic=
ations.

The scope of the SPRING WG work includes both single Autonomous System (AS=
) and multi-AS environments. Segment Routing operates within a trusted dom=
ain; as described in the architecture, a node imposing a segment list is a=
ssumed to be allowed to do so. Nonetheless, the SPRING WG must strive to i=
dentify and address security considerations brought up by the technologies=
 it defines.
The technologies SPRING WG defines may be applicable to both centralised a=
nd distributed path computation.

SPRING WG should avoid modification to existing data planes that would mak=
e them incompatible with existing deployments. Where possible, existing co=
ntrol and management plane protocols must be used within existing architec=
tures to implement the SPRING function. Any modification of -or extension =
to- existing architectures, data planes, or control or management plane pr=
otocols should be carried out in the WGs responsible for the architecture,=
 data plane, or control or management plane protocol being modified and in=

coordination with the SPRING WG, but may be done in SPRING WG after agreem=
ent with all the relevant WG chairs and responsible Area Directors.


The SPRING WG will manage its specific work items by milestones agreed wit=
h the responsible Area Director.

The work-items of the SPRING WG include functional specifications for:
o Segment Routing policies and the associated steering, signalling and tra=
ffic engineering mechanisms.

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplan=
es.

o SRv6 network programming for the underlay networks and overlay services,=
 and including data plane behavior and functions associated with SIDs

o Operation, Administration and Management (OAM), and traffic accounting i=
n networks with SR-MPLS and SRv6 data planes in the case where SR introduc=
es specificities compared to MPLS or IPv6 technologies.

o Performance Management (PM) and monitoring in networks with SR-MPLS and =
SRv6 data planes in the case where SR introduces specificities compared to=
 MPLS or IPv6 technologies.

o Inter-working between SRv6 and SR-MPLS  and between SR and existing rout=
ing solutions to allow for seamless deployment and co-existence..

o new types of segments mapping to forwarding behavior  (e.g. local ingres=
s replication, local forwarding resources, a pre-existing replication stru=
cture) if needed for new usages.

Any of the above may require architectural extensions.

The work-items of SPRING WG also include:
o Specification of management models (YANG) for Segment Routing applicatio=
ns, services and networks with SR-MPLS and SRv6 dataplanes.

The SPRING WG will coordinate and collaborate with other WGs as needed. Sp=
ecific
expected interactions include (but may not be limited to):
    * mpls on the MPLS dataplane and OAM extensions,
    * 6man on the IPv6 dataplane for SR and associated OAM extensions
    * lsr on OSPF and IS-IS extensions to flood SPRING-related information=

    * IDR for BGP extensions
    * bess for VPN control plane
    * pce on extensions to communicate with an external entity to compute =
and program SPRING paths
    * teas on generic traffic engineering architecture
    * sfc on service chaining applications
    * rtgwg on fast-reroute technologies



Thanks,
Rob, Bruno

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir
Sent: Friday, June 01, 2018 6:06 PM
To: SPRING WG List
Subject: [spring] Updating the SPRING WG Charter

Hi SPRING,

After the discussions on the list and in London relating to the charter, B=
runo and I have been working to propose a new charter for the WG with Mart=
in, and the other routing ADs. The text for this suggested charter is belo=
w. We would like to solicit WG feedback on the charter text prior to Marti=
n taking to the IESG. We'd like to try and get the charter agreed prior to=
 IETF 102 in Montr=E9al.

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home=
 of
Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serve=
s as
a forum to discuss SPRING networks operations, define new applications, an=
d
specify extensions of Segment Routing technologies.

The SPRING WG defines procedures that allow a node to steer a packet throu=
gh an
SR Policy instantiated as an ordered list of instructions called segments =
and
without the need for per-path state information to be held at transit node=
s.
Full explicit control (through loose or strict path specification) can be
achieved in a network comprising only SPRING nodes, however SPRING nodes m=
ust
inter-operate through loose routing in existing networks and may find it
advantageous to use loose routing for other network applications.

The scope of the SPRING WG work includes both single Autonomous System (AS=
) and
multi-AS environments. Segment Routing operates within a trusted domain; a=
s
described in the architecture, a node imposing a segment list is assumed t=
o be
allowed to do so. Nonetheless, the SPRING WG must strive to identify and
address security considerations brought up by the technologies it defines.=
  The
technologies SPRING WG defines may be applicable to both centralised and
distributed path computation.

SPRING WG should avoid modification to existing data planes that would mak=
e
them incompatible with existing deployments. Where possible, existing cont=
rol
and management plane protocols must be used within existing architectures =
to
implement the SPRING function. Any modification of - or extension to - exi=
sting
architectures, data planes, or control or management plane protocols shoul=
d be
carried out in the WGs responsible for the architecture, data plane, or co=
ntrol
or management plane protocol being modified and in coordination with the S=
PRING
WG, but may be done in SPRING WG after agreement with all the relevant WG
chairs and responsible Area Directors.


The SPRING WG will manage its specific work items by milestones agreed wit=
h the
responsible Area Director.

The work-items of the SPRING WG include functional specifications for:

o Segment Routing policies and the associated steering and traffic enginee=
ring
  mechanisms.

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplan=
es.

o SRv6 network programming for the underlay networks and overlay services,=
 and
  including data plane behavior and functions associated with SIDs

o Operation, Administration and Management (OAM), and traffic accounting i=
n
  networks with SR-MPLS and SRv6 data planes in the case where SR introduc=
es
  specificities compared to MPLS or IPv6 technologies.

o Performance Management (PM) and monitoring in networks with SR-MPLS and =
SRv6
  data planes in the case where SR introduces specificities compared to MP=
LS or
  IPv6 technologies.

o The inter-working between SRv6 and SR-MPLS.

o Using SR as the mechanism to identify sets of resources in networks with=

  SR-MPLS and SRv6 dataplanes.

Any of the above may require architectural extensions.

The work-items of SPRING WG also include:

o Specification of management models (YANG) for Segment Routing applicatio=
ns,
  services and networks with SR-MPLS and SRv6 dataplanes.

The SPRING WG will coordinate and collaborate with other WGs as needed. Sp=
ecific
expected interactions include (but may not be limited to):

    * mpls on the MPLS dataplane and OAM extensions,
    * 6man on the IPv6 dataplane for SR and associated OAM extensions
    * lsr on OSPF and IS-IS extensions to flood SPRING-related information=

        * idr for BGP extensions
    * bess for VPN control plane
    * pce on extensions to communicate with an external entity to compute =
and program SPRING paths
    * teas on generic traffic engineering architecture

Please comment on the contents of the charter text on the list.

Thanks,
Bruno & Rob

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Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859=
-1">
<meta content=3D"text/html; charset=3Dutf-8">
<meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)">
<style>
<!--
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<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Bruno and all,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
At the first glance looks just fine to me!<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Thumb typed by Sasha Vainshtein</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" c=
olor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> spring &lt;spring-b=
ounces@ietf.org&gt; on behalf of bruno.decraene@orange.com &lt;bruno.decra=
ene@orange.com&gt;<br>
<b>Sent:</b> Thursday, June 28, 2018 3:51:43 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Subject:</b> Re: [spring] Updating the SPRING WG Charter</font>
<div>&nbsp;</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt; font-family:&quot;=
Arial&quot;,&quot;sans-serif&quot;; color:black">Hi SPRING,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt; font-family:&quot;=
Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">Following =
the discussion on the mailing list, please find below the updated text.</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">The plan i=
s to send it to Martin end of this week.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The Sourc=
e Packet Routing in NetworkinG (SPRING) Working Group is the home of Segme=
nt Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING
 WG serves as a forum to discuss SPRING networks operations, define new ap=
plications, and specify extensions of Segment Routing technologies.</span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The SPRIN=
G WG defines procedures that allow a node to steer a packet through an SR =
Policy instantiated as an ordered list of instructions called
 segments and without the need for per-path state information to be held a=
t transit nodes. Full explicit control (through loose or strict path speci=
fication) can be achieved in a network comprising only SPRING nodes, howev=
er SPRING nodes must inter-operate
 through loose routing in existing networks and may find it advantageous t=
o use loose routing for other network applications.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The scope=
 of the SPRING WG work includes both single Autonomous System (AS) and mul=
ti-AS environments. Segment Routing operates within a trusted
 domain; as described in the architecture, a node imposing a segment list =
is assumed to be allowed to do so. Nonetheless, the SPRING WG must strive =
to identify and address security considerations brought up by the technolo=
gies it defines.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The techn=
ologies SPRING WG defines may be applicable to both centralised and distri=
buted path computation.&nbsp;
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">SPRING WG=
 should avoid modification to existing data planes that would make them in=
compatible with existing deployments. Where possible, existing
 control and management plane protocols must be used within existing archi=
tectures to implement the SPRING function. Any modification of -or extensi=
on to- existing architectures, data planes, or control or management plane=
 protocols should be carried out in
 the WGs responsible for the architecture, data plane, or control or manag=
ement plane protocol being modified and in
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">coordinat=
ion with the SPRING WG, but may be done in SPRING WG after agreement with =
all the relevant WG chairs and responsible Area Directors.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The SPRIN=
G WG will manage its specific work items by milestones agreed with the res=
ponsible Area Director.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The work-=
items of the SPRING WG include functional specifications for:</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Segment=
 Routing policies and the associated steering, signalling and traffic engi=
neering mechanisms.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Source-=
routed stateless service chaining using SR-MPLS and SRv6 dataplanes.</span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o SRv6 ne=
twork programming for the underlay networks and overlay services, and incl=
uding data plane behavior and functions associated with SIDs</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Operati=
on, Administration and Management (OAM), and traffic accounting in network=
s with SR-MPLS and SRv6 data planes in the case where SR introduces
 specificities compared to MPLS or IPv6 technologies.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Perform=
ance Management (PM) and monitoring in networks with SR-MPLS and SRv6 data=
 planes in the case where SR introduces specificities compared
 to MPLS or IPv6 technologies.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p=20class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; f=
ont-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Inter=
-working between SRv6 and SR-MPLS&nbsp; and between SR and existing routin=
g solutions to allow for seamless deployment and co-existence..
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o new typ=
es of segments mapping to forwarding behavior&nbsp; (e.g. local ingress re=
plication, local forwarding resources, a pre-existing replication
 structure) if needed for new usages.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">Any of th=
e above may require architectural extensions.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The work-=
items of SPRING WG also include:</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">o Specifi=
cation of management models (YANG) for Segment Routing applications, servi=
ces and networks with SR-MPLS and SRv6 dataplanes.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">The SPRIN=
G WG will coordinate and collaborate with other WGs as needed. Specific</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">expected =
interactions include (but may not be limited to):</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * mpls on the MPLS dataplane and OAM extensions,</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * 6man on the IPv6 dataplane for SR and associated OAM extension=
s</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * lsr on OSPF and IS-IS extensions to flood SPRING-related infor=
mation</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * IDR for BGP extensions</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * bess for VPN control plane</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * pce on extensions to communicate with an external entity to co=
mpute and program SPRING paths</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * teas on generic traffic engineering architecture</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * sfc on service chaining applications</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Courier New&quot;,&quot;serif&quot;; color:black">&nbsp;&nb=
sp;&nbsp; * rtgwg on fast-reroute technologies</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">Thanks,</s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">Rob, Bruno=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt; fon=
t-family:&quot;Arial&quot;,&quot;sans-serif&quot;; color:black">&nbsp;</sp=
an></p>
<div style=3D"border:none; border-left:solid blue 1.5pt; padding:0cm 0cm 0=
cm 4.0pt">
<div>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0=
cm 0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt; font-family:&qu=
ot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"fon=
t-size:10.0pt; font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> spr=
ing [mailto:spring-bounces@ietf.org]
<b>On Behalf Of </b>Rob Shakir<br>
<b>Sent:</b> Friday, June 01, 2018 6:06 PM<br>
<b>To:</b> SPRING WG List<br>
<b>Subject:</b> [spring] Updating the SPRING WG Charter</span></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<p class=3D"MsoNormal">Hi SPRING,</p>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">After the discussions on the list and in London rel=
ating to the charter, Bruno and I have been working to propose a new chart=
er for the WG with Martin, and the other routing ADs. The text for this su=
ggested charter is below.=20We would like
 to solicit WG feedback on the charter text prior to Martin taking to the =
IESG. We'd like to try and get the charter agreed prior to IETF 102 in Mon=
tr=E9al.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The Source Packet Routing in NetworkinG (SPRING) Workin=
g Group is the home of</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv=
6). SPRING WG serves as</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">a forum to discuss SPRING networks operations, define n=
ew applications, and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">specify extensions of Segment Routing technologies.</sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The SPRING WG defines procedures that allow a node to s=
teer a packet through an</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">SR Policy instantiated as an ordered list of instructio=
ns called segments and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">without the need for per-path state information to be h=
eld at transit nodes.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">Full explicit control (through loose or strict path spe=
cification) can be</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">achieved in a network comprising only SPRING nodes, how=
ever SPRING nodes must</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">inter-operate through loose routing in existing network=
s and may find it</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">advantageous to use loose routing for other network app=
lications.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The scope of the SPRING WG work includes both single Au=
tonomous System (AS) and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">multi-AS environments. Segment Routing operates within =
a trusted domain; as</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">described in the architecture, a node imposing a segmen=
t list is assumed to be</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">allowed to do so. Nonetheless, the SPRING WG must striv=
e to identify and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">address security considerations brought up by the techn=
ologies it defines.&nbsp; The</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">technologies SPRING WG defines may be applicable to bot=
h centralised and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">distributed path computation.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">SPRING WG should avoid modification to existing data pl=
anes that would make</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">them incompatible with existing deployments. Where poss=
ible, existing control</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">and management plane protocols must be used within exis=
ting architectures to</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">implement the SPRING function. Any modification of - or=
 extension to - existing</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">architectures, data planes, or control or management pl=
ane protocols should be</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">carried out in the WGs responsible for the architecture=
, data plane, or control</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">or management plane protocol being modified and in coor=
dination with the SPRING</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">WG, but may be done in SPRING WG after agreement with a=
ll the relevant WG</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">chairs and responsible Area Directors.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The SPRING WG will manage its specific work items by mi=
lestones agreed with the</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">responsible Area Director.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The work-items of the SPRING WG include functional spec=
ifications for:</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Segment Routing policies and the associated steering =
and traffic engineering</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; mechanisms.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Source-routed stateless service chaining using SR-MPL=
S and SRv6 dataplanes.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o SRv6 network programming for the underlay networks an=
d overlay services, and</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; including data plane behavior and functions asso=
ciated with SIDs</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Operation, Administration and Management (OAM), and t=
raffic accounting in</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; networks with SR-MPLS and SRv6 data planes in th=
e case where SR introduces</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; specificities compared to MPLS or IPv6 technolog=
ies.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Performance Management (PM) and monitoring in network=
s with SR-MPLS and SRv6</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; data planes in the case where SR introduces spec=
ificities compared to MPLS or</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; IPv6 technologies.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o The inter-working between SRv6 and SR-MPLS.</span></p=
>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Using SR as the mechanism to identify sets of resourc=
es in networks with</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; SR-MPLS and SRv6 dataplanes.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">Any of the above may require architectural extensions.<=
/span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The work-items of SPRING WG also include:</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">o Specification of management models (YANG) for Segment=
 Routing applications,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; services and networks with SR-MPLS and SRv6 data=
planes.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">The SPRING WG will coordinate and collaborate with othe=
r WGs as needed. Specific</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">expected interactions include (but may not be limited t=
o):</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * mpls=20on the MPLS dataplane and O=
AM extensions,</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * 6man on the IPv6 dataplane for SR =
and associated OAM extensions</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * lsr on OSPF and IS-IS extensions t=
o flood SPRING-related information</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp; &nbsp; &nbsp; &nbsp; * idr for BGP extensions</s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * bess for VPN control plane</span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * pce on extensions to communicate w=
ith an external entity to compute and program SPRING paths</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;,=
&quot;serif&quot;">&nbsp;&nbsp;&nbsp; * teas on generic traffic engineerin=
g architecture</span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal">Please comment on the contents of the charter text =
on the list.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,</p>
</div>
<div>
<p class=3D"MsoNormal">Bruno &amp; Rob</p>
</div>
</div>
</div>
</div>
</div>
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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From nobody Thu Jun 28 11:38:08 2018
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Subject: [spring] I-D Action: draft-ietf-spring-sr-yang-09.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Source Packet Routing in Networking WG of the IETF.

        Title           : YANG Data Model for Segment Routing
        Authors         : Stephane Litkowski
                          Yingzhen Qu
                          Pushpasis Sarkar
                          Jeff Tantsura
	Filename        : draft-ietf-spring-sr-yang-09.txt
	Pages           : 30
	Date            : 2018-06-28

Abstract:
   This document defines a YANG data model ([RFC6020], [RFC7950]) for
   segment routing ([I-D.ietf-spring-segment-routing]) configuration and
   operation.  This YANG model is intended to be used on network
   elements to configure or operate segment routing.  This document
   defines also generic containers that SHOULD be reused by IGP protocol
   modules to support segment routing.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-sr-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-spring-sr-yang-09
https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-yang-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-spring-sr-yang-09


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Thread-Topic: [spring] Updating the SPRING WG Charter
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/ZE7u41O6_uVHl0ifY2fC5NI1Fhk>
Subject: Re: [spring] Updating the SPRING WG Charter
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To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] Updating the SPRING WG Charter
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--_000_76CD132C3ADEF848BD84D028D243C927A6E702AENKGEML515MBXchi_--


From nobody Fri Jun 29 02:45:04 2018
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: SPRING WG List <spring@ietf.org>
Thread-Topic: I-D Action: draft-dong-lsr-sr-enhanced-vpn-00.txt
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Date: Fri, 29 Jun 2018 09:44:49 +0000
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Subject: [spring] FW: I-D Action: draft-dong-lsr-sr-enhanced-vpn-00.txt
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FYI we have submitted a draft in LSR WG on the IGP extensions for SR based =
enhanced VPN.=20

This is an accompanying document of draft-dong-spring-sr-for-enhanced-vpn-0=
0.

Comments are welcome.

Best regards,
Jie

-----Original Message-----
From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]=20
Sent: Thursday, June 21, 2018 12:06 AM
To: i-d-announce@ietf.org
Subject: I-D Action: draft-dong-lsr-sr-enhanced-vpn-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.


        Title           : IGP Extensions for Segment Routing based Enhanced=
 VPN
        Authors        : Jie Dong
                        Stewart Bryant
	Filename        : draft-dong-lsr-sr-enhanced-vpn-00.txt
	Pages           : 13
	Date            : 2018-06-20

Abstract:
   Enhanced VPN (VPN+) is an enhancement to VPN services to support the
   needs of new applications, particularly including the applications
   that are associated with 5G services.  These applications require
   better isolation and have more stringent performance requirements
   than that can be provided with traditional overlay VPNs.  An enhanced
   VPN may form the underpin of 5G transport network slicing, and will
   also be of use in its own right.  This document describes how Multi-
   Topology Routing (MTR) as described in RFC 5120 and RFC 4915, can be
   extended to signal the resources allocated in the underlay network to
   construct the virtual networks for enhanced VPN services, together
   with the Segment Routing Identifiers (SIDs) used to identify and
   access the network resources allocated for the virtual networks in
   the data plane.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-vpn/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-dong-lsr-sr-enhanced-vpn-00
https://datatracker.ietf.org/doc/html/draft-dong-lsr-sr-enhanced-vpn-00


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: <bruno.decraene@orange.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Fri, 29 Jun 2018 13:49:43 +0000
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From: <bruno.decraene@orange.com>
To: Linda Dunbar <linda.dunbar@huawei.com>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Date: Fri, 29 Jun 2018 13:56:17 +0000
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Subject: Re: [spring] Updating the SPRING WG Charter
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
CC: SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] Updating the SPRING WG Charter
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Hi Bruno,
We have posted an IETF draft to perform MPLS Ping/Traceroute operations for=
 Flex Algo Prefix SID.

https://tools.ietf.org/html/draft-iqbal-spring-mpls-ping-algo-00

We'd like to request an 8 minutes presentation slot to discuss it during th=
e WG meeting.

Regards,
Faisal

From: spring <spring-bounces@ietf.org> On Behalf Of bruno.decraene@orange.c=
om
Sent: Monday, June 18, 2018 6:30 AM
To: spring@ietf.org
Subject: [spring] IETF 102 - SPRING meeting


Hi all,



During IETF 102, the SPRING WG is currently scheduled to meet Monday 13:30-=
15:30. We have a two hours session.
https://datatracker.ietf.org/meeting/102/agenda.html


It is time start building the SPRING WG agenda for Montreal.

Please send your request for a presentation slot, indicating draft name, sp=
eaker, and desired duration (covering presentation and discussion), before =
Monday 2018-07-02  09:00 CET. Before is better.

If it is not the first presentation of a non-WG draft, please give a reason=
 why it is required to have a new presentation slot.

A checklist is available on the wiki: https://trac.ietf.org/trac/spring/wik=
i/Checklist%20for%20presenting%20at%20a%20SPRING%20meeting



As we are meeting on Monday, please send your slides on time, before Sunday=
 18:00 local time. Earlier is better.


Thanks,
--Bruno, Rob

___________________________________________________________________________=
______________________________________________



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Bruno,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">We have posted an IETF=
 draft to perform MPLS Ping/Traceroute operations for Flex Algo Prefix SID.=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-iqba=
l-spring-mpls-ping-algo-00">https://tools.ietf.org/html/draft-iqbal-spring-=
mpls-ping-algo-00</a><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">We&#8217;d like to req=
uest an 8 minutes presentation slot to discuss it during the WG meeting.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Faisal<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> spring &lt;spring-bounces@ietf.org&gt; =
<b>On Behalf Of
</b>bruno.decraene@orange.com<br>
<b>Sent:</b> Monday, June 18, 2018 6:30 AM<br>
<b>To:</b> spring@ietf.org<br>
<b>Subject:</b> [spring] IETF 102 - SPRING meeting<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">Hi all,<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-s=
erif">During IETF 102, the SPRING WG is currently scheduled to meet Monday =
13:30-15:30. We have a two hours session.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><a href=3D"https://datatracker.ietf.org/meeting/102/a=
genda.html">https://datatracker.ietf.org/meeting/102/agenda.html</a><o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText">It is time start building the SPRING WG agenda fo=
r Montreal.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please send your request for a presentation slot,=
 indicating draft name, speaker, and desired duration (covering presentatio=
n and discussion), before Monday 2018-07-02 &nbsp;09:00 CET. Before is bett=
er.
<o:p></o:p></p>
<p class=3D"MsoPlainText">If it is not the first presentation of a non-WG d=
raft, please give a reason why it is required to have a new presentation sl=
ot.<o:p></o:p></p>
<p class=3D"MsoPlainText">A checklist is available on the wiki: <a href=3D"=
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting">
https://trac.ietf.org/trac/spring/wiki/Checklist%20for%20presenting%20at%20=
a%20SPRING%20meeting</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As we are meeting on Monday, please send your sli=
des on time, before Sunday 18:00 local time. Earlier is better.<o:p></o:p><=
/p>
<pre><o:p>&nbsp;</o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif">--Bruno, Rob<o:p></o:p></span></p>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
:p></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<o:p></o:p></s=
pan></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<o:p></o:p></spa=
n></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<o:p></o:p></span></p=
re>
<pre><span lang=3D"FR">Thank you.<o:p></o:p></span></pre>
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Date: Fri, 29 Jun 2018 11:19:41 -0400
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Linda Dunbar <linda.dunbar@huawei.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
CC: SPRING WG List <spring@ietf.org>
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Thread-Topic: [spring] Updating the SPRING WG Charter
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Linda,

=20

=E2=80=9CLegacy Networks=E2=80=9D is a derogatory term used by OF bigots to call anythi=
ng, that=E2=80=99s =C2=A0distributed =E2=98=BA

There=E2=80=99s nothing wrong with changing and evolving existing networking to b=
e more programmable and flexible, changes are welcome.

=20

I don=E2=80=99t think we should call existing networking =E2=80=93 =E2=80=9CLegacy=E2=80=9D.

=20

Cheers,

Jeff

From: spring <spring-bounces@ietf.org> on behalf of Linda Dunbar <linda.dun=
bar@huawei.com>
Date: Friday, June 29, 2018 at 11:05
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Cc: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] Updating the SPRING WG Charter

=20

Bruno,=20

=20

IMHO, =E2=80=9CInterworking between SR and Legacy Networks=E2=80=9D is more appropriate=
 than =E2=80=9CInterworking between SR and existing routing solutions=E2=80=9D because =E2=
=80=9CInterworking SR with existing routing solutions=E2=80=9D can imply needing chang=
es to the =E2=80=9Cexisting routing solutions=E2=80=9D.=20

=20

Linda

=20

=20

From: bruno.decraene@orange.com [mailto:bruno.decraene@orange.com]=20
Sent: Friday, June 29, 2018 8:56 AM
To: Linda Dunbar <linda.dunbar@huawei.com>
Cc: SPRING WG List <spring@ietf.org>
Subject: RE: [spring] Updating the SPRING WG Charter

=20

Linda,

=20

Thanks for the feedback.

Please see inline [Bruno]

=20

From: Linda Dunbar [mailto:linda.dunbar@huawei.com]=20
Sent: Thursday, June 28, 2018 6:18 PM
To: DECRAENE Bruno IMT/OLN; SPRING WG List
Subject: RE: [spring] Updating the SPRING WG Charter

=20

Bruno,=20

=20

Many thanks for the updated charter. All look good except one minor wording=
 change for the bullet:

=20

You have:

o Inter-working between SRv6 and SR-MPLS  and between SR and existing routi=
ng solutions to allow for seamless deployment and co-existence..=20

=20

We think it should be:

o Inter-working between SRv6 and SR-MPLS/LegacyNetwork  and between SR and =
existing routing solutions to allow for seamless deployment and co-existence=
..=20

=20

Because it is very likely that flows might traverse some segment of legacy =
network (like IPv4) before reaching SRv6 domain. After all, it is not like t=
o expect all network to be IPv6 from Day 1.=20

=20

[Bruno] I though this point would be covered by Inter-working [=E2=80=A6] between=
 SR and existing routing solutions to allow for seamless deployment and co-e=
xistence

Am I missing something? Or would you have something specific in mind?

=20

--Bruno

=20

Sincerely hope you can add those minor wording to the bullet.=20

=20

Linda Dunbar

=20

=20

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of bruno.decraene@o=
range.com
Sent: Thursday, June 28, 2018 7:52 AM
To: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] Updating the SPRING WG Charter

=20

Hi SPRING,

=20

Following the discussion on the mailing list, please find below the updated=
 text.

The plan is to send it to Martin end of this week.

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serv=
es as a forum to discuss SPRING networks operations, define new applications=
, and specify extensions of Segment Routing technologies.

=20

The SPRING WG defines procedures that allow a node to steer a packet throug=
h an SR Policy instantiated as an ordered list of instructions called segmen=
ts and without the need for per-path state information to be held at transit=
 nodes. Full explicit control (through loose or strict path specification) c=
an be achieved in a network comprising only SPRING nodes, however SPRING nod=
es must inter-operate through loose routing in existing networks and may fin=
d it advantageous to use loose routing for other network applications.

=20

The scope of the SPRING WG work includes both single Autonomous System (AS)=
 and multi-AS environments. Segment Routing operates within a trusted domain=
; as described in the architecture, a node imposing a segment list is assume=
d to be allowed to do so. Nonetheless, the SPRING WG must strive to identify=
 and address security considerations brought up by the technologies it defin=
es.

The technologies SPRING WG defines may be applicable to both centralised an=
d distributed path computation. =20

=20

SPRING WG should avoid modification to existing data planes that would make=
 them incompatible with existing deployments. Where possible, existing contr=
ol and management plane protocols must be used within existing architectures=
 to implement the SPRING function. Any modification of -or extension to- exi=
sting architectures, data planes, or control or management plane protocols s=
hould be carried out in the WGs responsible for the architecture, data plane=
, or control or management plane protocol being modified and in=20

coordination with the SPRING WG, but may be done in SPRING WG after agreeme=
nt with all the relevant WG chairs and responsible Area Directors.

=20

=20

The SPRING WG will manage its specific work items by milestones agreed with=
 the responsible Area Director.

=20

The work-items of the SPRING WG include functional specifications for:

o Segment Routing policies and the associated steering, signalling and traf=
fic engineering mechanisms.

=20

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplane=
s.

=20

o SRv6 network programming for the underlay networks and overlay services, =
and including data plane behavior and functions associated with SIDs

=20

o Operation, Administration and Management (OAM), and traffic accounting in=
 networks with SR-MPLS and SRv6 data planes in the case where SR introduces =
specificities compared to MPLS or IPv6 technologies.

=20

o Performance Management (PM) and monitoring in networks with SR-MPLS and S=
Rv6 data planes in the case where SR introduces specificities compared to MP=
LS or IPv6 technologies.

=20

o Inter-working between SRv6 and SR-MPLS  and between SR and existing routi=
ng solutions to allow for seamless deployment and co-existence..=20

=20

o new types of segments mapping to forwarding behavior  (e.g. local ingress=
 replication, local forwarding resources, a pre-existing replication structu=
re) if needed for new usages.

=20

Any of the above may require architectural extensions.

=20

The work-items of SPRING WG also include:

o Specification of management models (YANG) for Segment Routing application=
s, services and networks with SR-MPLS and SRv6 dataplanes.

=20

The SPRING WG will coordinate and collaborate with other WGs as needed. Spe=
cific

expected interactions include (but may not be limited to):

    * mpls on the MPLS dataplane and OAM extensions,

    * 6man on the IPv6 dataplane for SR and associated OAM extensions

    * lsr on OSPF and IS-IS extensions to flood SPRING-related information

    * IDR for BGP extensions

    * bess for VPN control plane

    * pce on extensions to communicate with an external entity to compute a=
nd program SPRING paths

    * teas on generic traffic engineering architecture

    * sfc on service chaining applications

    * rtgwg on fast-reroute technologies

=20

=20

=20

Thanks,

Rob, Bruno

=20

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir
Sent: Friday, June 01, 2018 6:06 PM
To: SPRING WG List
Subject: [spring] Updating the SPRING WG Charter

=20

Hi SPRING,

=20

After the discussions on the list and in London relating to the charter, Br=
uno and I have been working to propose a new charter for the WG with Martin,=
 and the other routing ADs. The text for this suggested charter is below. We=
 would like to solicit WG feedback on the charter text prior to Martin takin=
g to the IESG. We'd like to try and get the charter agreed prior to IETF 102=
 in Montr=C3=A9al.

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of

Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serves=
 as

a forum to discuss SPRING networks operations, define new applications, and

specify extensions of Segment Routing technologies.

=20

The SPRING WG defines procedures that allow a node to steer a packet throug=
h an

SR Policy instantiated as an ordered list of instructions called segments a=
nd

without the need for per-path state information to be held at transit nodes=
.

Full explicit control (through loose or strict path specification) can be

achieved in a network comprising only SPRING nodes, however SPRING nodes mu=
st

inter-operate through loose routing in existing networks and may find it

advantageous to use loose routing for other network applications.

=20

The scope of the SPRING WG work includes both single Autonomous System (AS)=
 and

multi-AS environments. Segment Routing operates within a trusted domain; as

described in the architecture, a node imposing a segment list is assumed to=
 be

allowed to do so. Nonetheless, the SPRING WG must strive to identify and

address security considerations brought up by the technologies it defines. =
 The

technologies SPRING WG defines may be applicable to both centralised and

distributed path computation.

=20

SPRING WG should avoid modification to existing data planes that would make

them incompatible with existing deployments. Where possible, existing contr=
ol

and management plane protocols must be used within existing architectures t=
o

implement the SPRING function. Any modification of - or extension to - exis=
ting

architectures, data planes, or control or management plane protocols should=
 be

carried out in the WGs responsible for the architecture, data plane, or con=
trol

or management plane protocol being modified and in coordination with the SP=
RING

WG, but may be done in SPRING WG after agreement with all the relevant WG

chairs and responsible Area Directors.

=20

=20

The SPRING WG will manage its specific work items by milestones agreed with=
 the

responsible Area Director.

=20

The work-items of the SPRING WG include functional specifications for:

=20

o Segment Routing policies and the associated steering and traffic engineer=
ing

  mechanisms.

=20

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplane=
s.

=20

o SRv6 network programming for the underlay networks and overlay services, =
and

  including data plane behavior and functions associated with SIDs

=20

o Operation, Administration and Management (OAM), and traffic accounting in

  networks with SR-MPLS and SRv6 data planes in the case where SR introduce=
s

  specificities compared to MPLS or IPv6 technologies.

=20

o Performance Management (PM) and monitoring in networks with SR-MPLS and S=
Rv6

  data planes in the case where SR introduces specificities compared to MPL=
S or

  IPv6 technologies.

=20

o The inter-working between SRv6 and SR-MPLS.

=20

o Using SR as the mechanism to identify sets of resources in networks with

  SR-MPLS and SRv6 dataplanes.

=20

Any of the above may require architectural extensions.

=20

The work-items of SPRING WG also include:

=20

o Specification of management models (YANG) for Segment Routing application=
s,

  services and networks with SR-MPLS and SRv6 dataplanes.

=20

The SPRING WG will coordinate and collaborate with other WGs as needed. Spe=
cific

expected interactions include (but may not be limited to):

=20

    * mpls on the MPLS dataplane and OAM extensions,

    * 6man on the IPv6 dataplane for SR and associated OAM extensions

    * lsr on OSPF and IS-IS extensions to flood SPRING-related information

        * idr for BGP extensions

    * bess for VPN control plane

    * pce on extensions to communicate with an external entity to compute a=
nd program SPRING paths

    * teas on generic traffic engineering architecture

=20

Please comment on the contents of the charter text on the list.

=20

Thanks,

Bruno & Rob
___________________________________________________________________________=
______________________________________________
=20
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tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.
=20
This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
___________________________________________________________________________=
______________________________________________
=20
Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.
=20
This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
_______________________________________________ spring mailing list spring@=
ietf.org https://www.ietf.org/mailman/listinfo/spring=20


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span.EmailStyle22
	{mso-style-type:personal;
	font-family:"Arial",sans-serif;
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	{mso-style-type:personal;
	font-family:"Calibri",sans-serif;
	color:#1F497D;}
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	{mso-style-type:personal;
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	{mso-style-type:personal;
	font-family:"Calibri",sans-serif;
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple><div class=3DWordSe=
ction1><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri=
",sans-serif'>Linda,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'fo=
nt-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</o:p></span></p=
><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans=
-serif'>=E2=80=9CLegacy Networks=E2=80=9D is a derogatory term used by OF bigots to call=
 anything, that=E2=80=99s =C2=A0distributed </span><span style=3D'font-size:11.0pt;font-=
family:"Apple Color Emoji"'>=E2=98=BA</span><span style=3D'font-size:11.0pt;font-fam=
ily:"Calibri",sans-serif'><o:p></o:p></span></p><p class=3DMsoNormal><span sty=
le=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>There=E2=80=99s nothing wro=
ng with changing and evolving existing networking to be more programmable an=
d flexible, changes are welcome.<o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</o:=
p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"C=
alibri",sans-serif'>I don=E2=80=99t think we should call existing networking =E2=80=93 =E2=
=80=9CLegacy=E2=80=9D.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:=
11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</o:p></span></p><div><p=
 class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-se=
rif;color:black'>Cheers,<o:p></o:p></span></p></div><p class=3DMsoNormal><span=
 style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'>Jeff<=
/span><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p><=
/o:p></span></p><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;paddi=
ng:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'color:black'>From: =
</span></b><span style=3D'color:black'>spring &lt;spring-bounces@ietf.org&gt; =
on behalf of Linda Dunbar &lt;linda.dunbar@huawei.com&gt;<br><b>Date: </b>Fr=
iday, June 29, 2018 at 11:05<br><b>To: </b>&quot;bruno.decraene@orange.com&q=
uot; &lt;bruno.decraene@orange.com&gt;<br><b>Cc: </b>SPRING WG List &lt;spri=
ng@ietf.org&gt;<br><b>Subject: </b>Re: [spring] Updating the SPRING WG Chart=
er<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'font-size=
:11.0pt'><o:p>&nbsp;</o:p></span></p></div><p class=3DMsoNormal><a name=3D"_Mail=
OriginalBody"><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif=
;color:#1F497D'>Bruno, </span><o:p></o:p></a></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-fami=
ly:"Calibri",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></span></p><p=
 class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>IMHO, =E2=80=9CInt=
erworking between SR and Legacy Networks=E2=80=9D is more appropriate than =E2=80=9CInte=
rworking between SR and existing routing solutions=E2=80=9D because =E2=80=9CInterworkin=
g SR with existing routing solutions=E2=80=9D can imply needing changes to the =E2=80=9C=
existing routing solutions=E2=80=9D. </span><o:p></o:p></span></p><p class=3DMsoNorm=
al><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0p=
t;font-family:"Calibri",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>L=
inda</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",san=
s-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;=
font-family:"Calibri",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></sp=
an></p><div><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3=
.0pt 0in 0in 0in'><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'><b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Fro=
m:</span></b></span><span style=3D'mso-bookmark:_MailOriginalBody'><span style=
=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> bruno.decraene@orange.=
com [mailto:bruno.decraene@orange.com] <br><b>Sent:</b> Friday, June 29, 201=
8 8:56 AM<br><b>To:</b> Linda Dunbar &lt;linda.dunbar@huawei.com&gt;<br><b>C=
c:</b> SPRING WG List &lt;spring@ietf.org&gt;<br><b>Subject:</b> RE: [spring=
] Updating the SPRING WG Charter</span><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:=
p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'=
><span lang=3DFR style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:=
black'>Linda,</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-fam=
ily:"Arial",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR sty=
le=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Thanks for =
the feedback.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-fam=
ily:"Arial",sans-serif;color:black'>Please see inline [Bruno]</span><o:p></o=
:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><span lang=3DFR style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color=
:black'>&nbsp;</span><o:p></o:p></span></p><div style=3D'border:none;border-le=
ft:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style=3D'border:none;=
border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'><b><span lang=3DFR style=3D'font-s=
ize:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></b></span><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;fo=
nt-family:"Tahoma",sans-serif'> Linda Dunbar [</span></span><a href=3D"mailto:=
linda.dunbar@huawei.com"><span style=3D'mso-bookmark:_MailOriginalBody'><span =
lang=3DFR style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>mailto:lind=
a.dunbar@huawei.com</span></span><span style=3D'mso-bookmark:_MailOriginalBody=
'></span></a><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR styl=
e=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>] <br><b>Sent:</b> Thur=
sday, June 28, 2018 6:18 PM<br><b>To:</b> DECRAENE Bruno IMT/OLN; SPRING WG =
List<br><b>Subject:</b> RE: [spring] Updating the SPRING WG Charter</span><o=
:p></o:p></span></p></div></div><p class=3DMsoNormal><span style=3D'mso-bookmark=
:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p><p clas=
s=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-s=
ize:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Bruno, </span><o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:=
#1F497D'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'=
mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"C=
alibri",sans-serif;color:#1F497D'>Many thanks for the updated charter. All l=
ook good except one minor wording change for the bullet:</span><o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>&=
nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookma=
rk:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sa=
ns-serif;color:#1F497D'>You have:</span><o:p></o:p></span></p><p class=3DMsoNo=
rmal style=3D'margin-left:.5in'><span style=3D'mso-bookmark:_MailOriginalBody'><=
i><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o Int=
er-working between SRv6 and SR-MPLS&nbsp; and between SR and existing routin=
g solutions to allow for seamless deployment and co-existence.. </span></i><=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;colo=
r:#1F497D'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:=
"Calibri",sans-serif;color:#1F497D'>We think it should be:</span><o:p></o:p>=
</span></p><p class=3DMsoNormal style=3D'margin-left:.5in'><span style=3D'mso-book=
mark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier N=
ew";color:black'>o Inter-working between SRv6 and SR-MPLS</span></span><span=
 style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-f=
amily:"Courier New";color:red'>/LegacyNetwork&nbsp; </span></span><span styl=
e=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family=
:"Courier New";color:black'>and between SR and existing routing solutions to=
 allow for seamless deployment and co-existence.. </span><o:p></o:p></span><=
/p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span sty=
le=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>&nbsp;<=
/span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-ser=
if;color:#1F497D'>Because it is very likely that flows might traverse some s=
egment of legacy network (like IPv4) before reaching SRv6 domain. After all,=
 it is not like to expect all network to be IPv6 from Day 1. </span><o:p></o=
:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:black=
'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Arial",s=
ans-serif;color:black'>[Bruno] I though this point would be covered by </spa=
n></span><span style=3D'mso-bookmark:_MailOriginalBody'><i><span style=3D'font-s=
ize:10.0pt;font-family:"Courier New";color:black'>Inter-working [=E2=80=A6] betwee=
n SR and existing routing solutions to allow for seamless deployment and co-=
existence</span></i><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Ari=
al",sans-serif;color:black'>Am I missing something? Or would you have someth=
ing specific in mind?</span><o:p></o:p></span></p><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fam=
ily:"Arial",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font=
-size:10.0pt;font-family:"Arial",sans-serif;color:black'>--Bruno</span><o:p>=
</o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalB=
ody'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:blac=
k'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bo=
okmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri=
",sans-serif;color:#1F497D'>Sincerely hope you can add those minor wording t=
o the bullet. </span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'm=
so-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Ca=
libri",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-si=
ze:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Linda Dunbar</span=
><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;co=
lor:#1F497D'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;font-famil=
y:"Calibri",sans-serif;color:#1F497D'>&nbsp;</span><o:p></o:p></span></p><di=
v><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in'><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><b><=
span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b></span><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-siz=
e:11.0pt;font-family:"Calibri",sans-serif'> spring [</span></span><a href=3D"m=
ailto:spring-bounces@ietf.org"><span style=3D'mso-bookmark:_MailOriginalBody'>=
<span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>mailto:sprin=
g-bounces@ietf.org</span></span><span style=3D'mso-bookmark:_MailOriginalBody'=
></span></a><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-s=
ize:11.0pt;font-family:"Calibri",sans-serif'>] <b>On Behalf Of </b></span></=
span><a href=3D"mailto:bruno.decraene@orange.com"><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-se=
rif'>bruno.decraene@orange.com</span></span><span style=3D'mso-bookmark:_MailO=
riginalBody'></span></a><span style=3D'mso-bookmark:_MailOriginalBody'><span s=
tyle=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><br><b>Sent:</b> Th=
ursday, June 28, 2018 7:52 AM<br><b>To:</b> SPRING WG List &lt;</span></span=
><a href=3D"mailto:spring@ietf.org"><span style=3D'mso-bookmark:_MailOriginalBod=
y'><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>spring@ie=
tf.org</span></span><span style=3D'mso-bookmark:_MailOriginalBody'></span></a>=
<span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;f=
ont-family:"Calibri",sans-serif'>&gt;<br><b>Subject:</b> Re: [spring] Updati=
ng the SPRING WG Charter</span><o:p></o:p></span></p></div></div><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span=
></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span l=
ang=3DFR style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>H=
i SPRING,</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bo=
okmark:_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-family:=
"Arial",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-siz=
e:10.0pt;font-family:"Arial",sans-serif;color:black'>Following the discussio=
n on the mailing list, please find below the updated text.</span><o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>The=
 plan is to send it to Martin end of this week.</span><o:p></o:p></span></p>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D=
'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>&nbsp;</span><=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black=
'>The Source Packet Routing in NetworkinG (SPRING) Working Group is the home=
 of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG ser=
ves as a forum to discuss SPRING networks operations, define new application=
s, and specify extensions of Segment Routing technologies.</span><o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</=
span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color=
:black'>The SPRING WG defines procedures that allow a node to steer a packet=
 through an SR Policy instantiated as an ordered list of instructions called=
 segments and without the need for per-path state information to be held at =
transit nodes. Full explicit control (through loose or strict path specifica=
tion) can be achieved in a network comprising only SPRING nodes, however SPR=
ING nodes must inter-operate through loose routing in existing networks and =
may find it advantageous to use loose routing for other network applications=
.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_=
MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";co=
lor:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:=
"Courier New";color:black'>The scope of the SPRING WG work includes both sin=
gle Autonomous System (AS) and multi-AS environments. Segment Routing operat=
es within a trusted domain; as described in the architecture, a node imposin=
g a segment list is assumed to be allowed to do so. Nonetheless, the SPRING =
WG must strive to identify and address security considerations brought up by=
 the technologies it defines.</span><o:p></o:p></span></p><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;=
font-family:"Courier New";color:black'>The technologies SPRING WG defines ma=
y be applicable to both centralised and distributed path computation.&nbsp; =
</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";col=
or:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"=
Courier New";color:black'>SPRING WG should avoid modification to existing da=
ta planes that would make them incompatible with existing deployments. Where=
 possible, existing control and management plane protocols must be used with=
in existing architectures to implement the SPRING function. Any modification=
 of -or extension to- existing architectures, data planes, or control or man=
agement plane protocols should be carried out in the WGs responsible for the=
 architecture, data plane, or control or management plane protocol being mod=
ified and in </span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Cou=
rier New";color:black'>coordination with the SPRING WG, but may be done in S=
PRING WG after agreement with all the relevant WG chairs and responsible Are=
a Directors.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Cour=
ier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal>=
<span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;f=
ont-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fo=
nt-size:10.0pt;font-family:"Courier New";color:black'>The SPRING WG will man=
age its specific work items by milestones agreed with the responsible Area D=
irector.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>The work-items of the SPRING WG include fu=
nctional specifications for:</span><o:p></o:p></span></p><p class=3DMsoNormal>=
<span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;f=
ont-family:"Courier New";color:black'>o Segment Routing policies and the ass=
ociated steering, signalling and traffic engineering mechanisms.</span><o:p>=
</o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalB=
ody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&n=
bsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New"=
;color:black'>o Source-routed stateless service chaining using SR-MPLS and S=
Rv6 dataplanes.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'=
mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"C=
ourier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNorm=
al><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0p=
t;font-family:"Courier New";color:black'>o SRv6 network programming for the =
underlay networks and overlay services, and including data plane behavior an=
d functions associated with SIDs</span><o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0=
pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=
=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o Operation, Admin=
istration and Management (OAM), and traffic accounting in networks with SR-M=
PLS and SRv6 data planes in the case where SR introduces specificities compa=
red to MPLS or IPv6 technologies.</span><o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.=
0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span styl=
e=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o Performance Man=
agement (PM) and monitoring in networks with SR-MPLS and SRv6 data planes in=
 the case where SR introduces specificities compared to MPLS or IPv6 technol=
ogies.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookm=
ark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier Ne=
w";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fa=
mily:"Courier New";color:black'>o Inter-working between SRv6 and SR-MPLS&nbs=
p; and between SR and existing routing solutions to allow for seamless deplo=
yment and co-existence.. </span><o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font=
-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-=
size:10.0pt;font-family:"Courier New";color:black'>o new types of segments m=
apping to forwarding behavior&nbsp; (e.g. local ingress replication, local f=
orwarding resources, a pre-existing replication structure) if needed for new=
 usages.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>Any of the above may require architectural=
 extensions.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Cour=
ier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal>=
<span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;f=
ont-family:"Courier New";color:black'>The work-items of SPRING WG also inclu=
de:</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark=
:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";=
color:black'>o Specification of management models (YANG) for Segment Routing=
 applications, services and networks with SR-MPLS and SRv6 dataplanes.</span=
><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:bla=
ck'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courie=
r New";color:black'>The SPRING WG will coordinate and collaborate with other=
 WGs as needed. Specific</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>expected interactions include (but may not=
 be limited to):</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"=
Courier New";color:black'>&nbsp;&nbsp;&nbsp; * mpls on the MPLS dataplane an=
d OAM extensions,</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:=
"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * 6man on the IPv6 dataplane f=
or SR and associated OAM extensions</span><o:p></o:p></span></p><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:1=
0.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * lsr on OSP=
F and IS-IS extensions to flood SPRING-related information</span><o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&n=
bsp;&nbsp; * IDR for BGP extensions</span><o:p></o:p></span></p><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:1=
0.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * bess for V=
PN control plane</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"=
Courier New";color:black'>&nbsp;&nbsp;&nbsp; * pce on extensions to communic=
ate with an external entity to compute and program SPRING paths</span><o:p><=
/o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBo=
dy'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nb=
sp;&nbsp;&nbsp; * teas on generic traffic engineering architecture</span><o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>=
&nbsp;&nbsp;&nbsp; * sfc on service chaining applications</span><o:p></o:p><=
/span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><s=
pan style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nb=
sp;&nbsp; * rtgwg on fast-reroute technologies</span><o:p></o:p></span></p><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'=
font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>&nbsp;</span><o=
:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigin=
alBody'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:b=
lack'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Aria=
l",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.=
0pt;font-family:"Arial",sans-serif;color:black'>Thanks,</span><o:p></o:p></s=
pan></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><spa=
n style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Rob, B=
runo</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-=
serif;color:black'>&nbsp;</span><o:p></o:p></span></p><div style=3D'border:non=
e;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style=3D'b=
order:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p clas=
s=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><b><span lang=3DFR st=
yle=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></b></spa=
n><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-siz=
e:10.0pt;font-family:"Tahoma",sans-serif'> spring [</span></span><a href=3D"ma=
ilto:spring-bounces@ietf.org"><span style=3D'mso-bookmark:_MailOriginalBody'><=
span lang=3DFR style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>mailto=
:spring-bounces@ietf.org</span></span><span style=3D'mso-bookmark:_MailOrigina=
lBody'></span></a><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR=
 style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>] <b>On Behalf Of =
</b>Rob Shakir<br><b>Sent:</b> Friday, June 01, 2018 6:06 PM<br><b>To:</b> S=
PRING WG List<br><b>Subject:</b> [spring] Updating the SPRING WG Charter</sp=
an><o:p></o:p></span></p></div></div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lan=
g=3DFR>Hi SPRING,</span><o:p></o:p></span></p><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span lang=3DFR>After the discussions on the list and in London relat=
ing to the charter, Bruno and I have been working to propose a new charter f=
or the WG with Martin, and the other routing ADs. The text for this suggeste=
d charter is below. We would like to solicit WG feedback on the charter text=
 prior to Martin taking to the IESG. We'd like to try and get the charter ag=
reed prior to IETF 102 in Montr=C3=A9al.</span><o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DF=
R>&nbsp;</span><o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"C=
ourier New"'>The Source Packet Routing in NetworkinG (SPRING) Working Group =
is the home of</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"=
Courier New"'>Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPR=
ING WG serves as</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family=
:"Courier New"'>a forum to discuss SPRING networks operations, define new ap=
plications, and</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><s=
pan style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:=
"Courier New"'>specify extensions of Segment Routing technologies.</span><o:=
p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_=
MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=
=3DFR style=3D'font-family:"Courier New"'>The SPRING WG defines procedures that =
allow a node to steer a packet through an</span><o:p></o:p></span></p></div>=
<div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span l=
ang=3DFR style=3D'font-family:"Courier New"'>SR Policy instantiated as an ordere=
d list of instructions called segments and</span><o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span =
lang=3DFR style=3D'font-family:"Courier New"'>without the need for per-path stat=
e information to be held at transit nodes.</span><o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span =
lang=3DFR style=3D'font-family:"Courier New"'>Full explicit control (through loo=
se or strict path specification) can be</span><o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lan=
g=3DFR style=3D'font-family:"Courier New"'>achieved in a network comprising only=
 SPRING nodes, however SPRING nodes must</span><o:p></o:p></span></p></div><=
div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span la=
ng=3DFR style=3D'font-family:"Courier New"'>inter-operate through loose routing =
in existing networks and may find it</span><o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DF=
R style=3D'font-family:"Courier New"'>advantageous to use loose routing for ot=
her network applications.</span><o:p></o:p></span></p></div><div><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</s=
pan><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>The=
 scope of the SPRING WG work includes both single Autonomous System (AS) and=
</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-=
bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>=
multi-AS environments. Segment Routing operates within a trusted domain; as<=
/span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>d=
escribed in the architecture, a node imposing a segment list is assumed to b=
e</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'=
>allowed to do so. Nonetheless, the SPRING WG must strive to identify and</s=
pan><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>add=
ress security considerations brought up by the technologies it defines.&nbsp=
; The</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier N=
ew"'>technologies SPRING WG defines may be applicable to both centralised an=
d</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'=
>distributed path computation.</span><o:p></o:p></span></p></div><div><p cla=
ss=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbs=
p;</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"=
'>SPRING WG should avoid modification to existing data planes that would mak=
e</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'=
>them incompatible with existing deployments. Where possible, existing contr=
ol</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"=
'>and management plane protocols must be used within existing architectures =
to</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"=
'>implement the SPRING function. Any modification of - or extension to - exi=
sting</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier N=
ew"'>architectures, data planes, or control or management plane protocols sh=
ould be</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span styl=
e=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier=
 New"'>carried out in the WGs responsible for the architecture, data plane, =
or control</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Cour=
ier New"'>or management plane protocol being modified and in coordination wi=
th the SPRING</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"C=
ourier New"'>WG, but may be done in SPRING WG after agreement with all the r=
elevant WG</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Cour=
ier New"'>chairs and responsible Area Directors.</span><o:p></o:p></span></p=
></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=
<span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p class=3DMsoNorm=
al><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><=
o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark=
:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>The SPRI=
NG WG will manage its specific work items by milestones agreed with the</spa=
n><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookm=
ark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>respo=
nsible Area Director.</span><o:p></o:p></span></p></div><div><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span>=
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>The wor=
k-items of the SPRING WG include functional specifications for:</span><o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR=
 style=3D'font-family:"Courier New"'>o Segment Routing policies and the associ=
ated steering and traffic engineering</span><o:p></o:p></span></p></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3D=
FR style=3D'font-family:"Courier New"'>&nbsp; mechanisms.</span><o:p></o:p></s=
pan></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'=
font-family:"Courier New"'>o Source-routed stateless service chaining using =
SR-MPLS and SRv6 dataplanes.</span><o:p></o:p></span></p></div><div><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;=
</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-=
bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>=
o SRv6 network programming for the underlay networks and overlay services, a=
nd</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"=
'>&nbsp; including data plane behavior and functions associated with SIDs</s=
pan><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an lang=3DFR style=3D'font-family:"Courier New"'>o Operation, Administration and=
 Management (OAM), and traffic accounting in</span><o:p></o:p></span></p></d=
iv><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><spa=
n lang=3DFR style=3D'font-family:"Courier New"'>&nbsp; networks with SR-MPLS and=
 SRv6 data planes in the case where SR introduces</span><o:p></o:p></span></=
p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'=
><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp; specificities compar=
ed to MPLS or IPv6 technologies.</span><o:p></o:p></span></p></div><div><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&n=
bsp;</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'=
mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier Ne=
w"'>o Performance Management (PM) and monitoring in networks with SR-MPLS an=
d SRv6</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=
=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier =
New"'>&nbsp; data planes in the case where SR introduces specificities compa=
red to MPLS or</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"=
Courier New"'>&nbsp; IPv6 technologies.</span><o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lan=
g=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Cou=
rier New"'>o The inter-working between SRv6 and SR-MPLS.</span><o:p></o:p></=
span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigin=
alBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D=
'font-family:"Courier New"'>o Using SR as the mechanism to identify sets of =
resources in networks with</span><o:p></o:p></span></p></div><div><p class=3DM=
soNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'f=
ont-family:"Courier New"'>&nbsp; SR-MPLS and SRv6 dataplanes.</span><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR s=
tyle=3D'font-family:"Courier New"'>Any of the above may require architectural =
extensions.</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>The work-items of=
 SPRING WG also include:</span><o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</sp=
an><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-book=
mark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>o Sp=
ecification of management models (YANG) for Segment Routing applications,</s=
pan><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nb=
sp; services and networks with SR-MPLS and SRv6 dataplanes.</span><o:p></o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR sty=
le=3D'font-family:"Courier New"'>The SPRING WG will coordinate and collaborate=
 with other WGs as needed. Specific</span><o:p></o:p></span></p></div><div><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR=
 style=3D'font-family:"Courier New"'>expected interactions include (but may no=
t be limited to):</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal>=
<span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p=
></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp;&nbsp=
;&nbsp; * mpls on the MPLS dataplane and OAM extensions,</span><o:p></o:p></=
span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigin=
alBody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp; *=
 6man on the IPv6 dataplane for SR and associated OAM extensions</span><o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp;&nbsp;=
&nbsp; * lsr on OSPF and IS-IS extensions to flood SPRING-related informatio=
n</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'=
>&nbsp; &nbsp; &nbsp; &nbsp; * idr for BGP extensions</span><o:p></o:p></spa=
n></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalB=
ody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp; * be=
ss for VPN control plane</span><o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'fon=
t-family:"Courier New"'>&nbsp;&nbsp;&nbsp; * pce on extensions to communicat=
e with an external entity to compute and program SPRING paths</span><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span lang=3DFR style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nb=
sp; * teas on generic traffic engineering architecture</span><o:p></o:p></sp=
an></p></div></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOr=
iginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3D=
FR>Please comment on the contents of the charter text on the list.</span><o:=
p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_=
MailOriginalBody'><span lang=3DFR>&nbsp;</span><o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=
=3DFR>Thanks,</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR>Bruno &amp; Rob</span><=
o:p></o:p></span></p></div></div></div></div><pre><span style=3D'mso-bookmark:=
_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-family:"Courie=
r New"'>____________________________________________________________________=
_____________________________________________________</span><o:p></o:p></spa=
n></pre><pre><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR styl=
e=3D'font-size:10.0pt;font-family:"Courier New"'>&nbsp;</span><o:p></o:p></spa=
n></pre><pre><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR styl=
e=3D'font-size:10.0pt;font-family:"Courier New"'>Ce message et ses pieces join=
tes peuvent contenir des informations confidentielles ou privilegiees et ne =
doivent donc</span><o:p></o:p></span></pre><pre><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-family:"Courier =
New"'>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler</span><o:p></o:p></span></=
pre><pre><span style=3D'mso-bookmark:_MailOriginalBody'><span lang=3DFR style=3D'f=
ont-size:10.0pt;font-family:"Courier New"'>a l'expediteur et le detruire ain=
si que les pieces jointes. Les messages electroniques etant susceptibles d'a=
lteration,</span><o:p></o:p></span></pre><pre><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-family:"Courier Ne=
w"'>Orange decline toute responsabilite si ce message a ete altere, deforme =
ou falsifie. Merci.</span><o:p></o:p></span></pre><pre><span style=3D'mso-book=
mark:_MailOriginalBody'><span lang=3DFR style=3D'font-size:10.0pt;font-family:"C=
ourier New"'>&nbsp;</span><o:p></o:p></span></pre><pre><span style=3D'mso-book=
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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
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Date: Fri, 29 Jun 2018 12:17:13 -0400
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: <bruno.decraene@orange.com>, SPRING WG List <spring@ietf.org>
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Hi Bruno/Rob,

=20

Looks good, well done!

=20

Cheers,

Jeff

From: spring <spring-bounces@ietf.org> on behalf of <bruno.decraene@orange.=
com>
Date: Thursday, June 28, 2018 at 08:52
To: SPRING WG List <spring@ietf.org>
Subject: Re: [spring] Updating the SPRING WG Charter

=20

Hi SPRING,

=20

Following the discussion on the mailing list, please find below the updated=
 text.

The plan is to send it to Martin end of this week.

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serv=
es as a forum to discuss SPRING networks operations, define new applications=
, and specify extensions of Segment Routing technologies.

=20

The SPRING WG defines procedures that allow a node to steer a packet throug=
h an SR Policy instantiated as an ordered list of instructions called segmen=
ts and without the need for per-path state information to be held at transit=
 nodes. Full explicit control (through loose or strict path specification) c=
an be achieved in a network comprising only SPRING nodes, however SPRING nod=
es must inter-operate through loose routing in existing networks and may fin=
d it advantageous to use loose routing for other network applications.

=20

The scope of the SPRING WG work includes both single Autonomous System (AS)=
 and multi-AS environments. Segment Routing operates within a trusted domain=
; as described in the architecture, a node imposing a segment list is assume=
d to be allowed to do so. Nonetheless, the SPRING WG must strive to identify=
 and address security considerations brought up by the technologies it defin=
es.

The technologies SPRING WG defines may be applicable to both centralised an=
d distributed path computation. =20

=20

SPRING WG should avoid modification to existing data planes that would make=
 them incompatible with existing deployments. Where possible, existing contr=
ol and management plane protocols must be used within existing architectures=
 to implement the SPRING function. Any modification of -or extension to- exi=
sting architectures, data planes, or control or management plane protocols s=
hould be carried out in the WGs responsible for the architecture, data plane=
, or control or management plane protocol being modified and in=20

coordination with the SPRING WG, but may be done in SPRING WG after agreeme=
nt with all the relevant WG chairs and responsible Area Directors.

=20

=20

The SPRING WG will manage its specific work items by milestones agreed with=
 the responsible Area Director.

=20

The work-items of the SPRING WG include functional specifications for:

o Segment Routing policies and the associated steering, signalling and traf=
fic engineering mechanisms.

=20

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplane=
s.

=20

o SRv6 network programming for the underlay networks and overlay services, =
and including data plane behavior and functions associated with SIDs

=20

o Operation, Administration and Management (OAM), and traffic accounting in=
 networks with SR-MPLS and SRv6 data planes in the case where SR introduces =
specificities compared to MPLS or IPv6 technologies.

=20

o Performance Management (PM) and monitoring in networks with SR-MPLS and S=
Rv6 data planes in the case where SR introduces specificities compared to MP=
LS or IPv6 technologies.

=20

o Inter-working between SRv6 and SR-MPLS  and between SR and existing routi=
ng solutions to allow for seamless deployment and co-existence..=20

=20

o new types of segments mapping to forwarding behavior  (e.g. local ingress=
 replication, local forwarding resources, a pre-existing replication structu=
re) if needed for new usages.

=20

Any of the above may require architectural extensions.

=20

The work-items of SPRING WG also include:

o Specification of management models (YANG) for Segment Routing application=
s, services and networks with SR-MPLS and SRv6 dataplanes.

=20

The SPRING WG will coordinate and collaborate with other WGs as needed. Spe=
cific

expected interactions include (but may not be limited to):

    * mpls on the MPLS dataplane and OAM extensions,

    * 6man on the IPv6 dataplane for SR and associated OAM extensions

    * lsr on OSPF and IS-IS extensions to flood SPRING-related information

    * IDR for BGP extensions

    * bess for VPN control plane

    * pce on extensions to communicate with an external entity to compute a=
nd program SPRING paths

    * teas on generic traffic engineering architecture

    * sfc on service chaining applications

    * rtgwg on fast-reroute technologies

=20

=20

=20

Thanks,

Rob, Bruno

=20

From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Rob Shakir
Sent: Friday, June 01, 2018 6:06 PM
To: SPRING WG List
Subject: [spring] Updating the SPRING WG Charter

=20

Hi SPRING,

=20

After the discussions on the list and in London relating to the charter, Br=
uno and I have been working to propose a new charter for the WG with Martin,=
 and the other routing ADs. The text for this suggested charter is below. We=
 would like to solicit WG feedback on the charter text prior to Martin takin=
g to the IESG. We'd like to try and get the charter agreed prior to IETF 102=
 in Montr=C3=A9al.

=20

The Source Packet Routing in NetworkinG (SPRING) Working Group is the home =
of

Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serves=
 as

a forum to discuss SPRING networks operations, define new applications, and

specify extensions of Segment Routing technologies.

=20

The SPRING WG defines procedures that allow a node to steer a packet throug=
h an

SR Policy instantiated as an ordered list of instructions called segments a=
nd

without the need for per-path state information to be held at transit nodes=
.

Full explicit control (through loose or strict path specification) can be

achieved in a network comprising only SPRING nodes, however SPRING nodes mu=
st

inter-operate through loose routing in existing networks and may find it

advantageous to use loose routing for other network applications.

=20

The scope of the SPRING WG work includes both single Autonomous System (AS)=
 and

multi-AS environments. Segment Routing operates within a trusted domain; as

described in the architecture, a node imposing a segment list is assumed to=
 be

allowed to do so. Nonetheless, the SPRING WG must strive to identify and

address security considerations brought up by the technologies it defines. =
 The

technologies SPRING WG defines may be applicable to both centralised and

distributed path computation.

=20

SPRING WG should avoid modification to existing data planes that would make

them incompatible with existing deployments. Where possible, existing contr=
ol

and management plane protocols must be used within existing architectures t=
o

implement the SPRING function. Any modification of - or extension to - exis=
ting

architectures, data planes, or control or management plane protocols should=
 be

carried out in the WGs responsible for the architecture, data plane, or con=
trol

or management plane protocol being modified and in coordination with the SP=
RING

WG, but may be done in SPRING WG after agreement with all the relevant WG

chairs and responsible Area Directors.

=20

=20

The SPRING WG will manage its specific work items by milestones agreed with=
 the

responsible Area Director.

=20

The work-items of the SPRING WG include functional specifications for:

=20

o Segment Routing policies and the associated steering and traffic engineer=
ing

  mechanisms.

=20

o Source-routed stateless service chaining using SR-MPLS and SRv6 dataplane=
s.

=20

o SRv6 network programming for the underlay networks and overlay services, =
and

  including data plane behavior and functions associated with SIDs

=20

o Operation, Administration and Management (OAM), and traffic accounting in

  networks with SR-MPLS and SRv6 data planes in the case where SR introduce=
s

  specificities compared to MPLS or IPv6 technologies.

=20

o Performance Management (PM) and monitoring in networks with SR-MPLS and S=
Rv6

  data planes in the case where SR introduces specificities compared to MPL=
S or

  IPv6 technologies.

=20

o The inter-working between SRv6 and SR-MPLS.

=20

o Using SR as the mechanism to identify sets of resources in networks with

  SR-MPLS and SRv6 dataplanes.

=20

Any of the above may require architectural extensions.

=20

The work-items of SPRING WG also include:

=20

o Specification of management models (YANG) for Segment Routing application=
s,

  services and networks with SR-MPLS and SRv6 dataplanes.

=20

The SPRING WG will coordinate and collaborate with other WGs as needed. Spe=
cific

expected interactions include (but may not be limited to):

=20

    * mpls on the MPLS dataplane and OAM extensions,

    * 6man on the IPv6 dataplane for SR and associated OAM extensions

    * lsr on OSPF and IS-IS extensions to flood SPRING-related information

        * idr for BGP extensions

    * bess for VPN control plane

    * pce on extensions to communicate with an external entity to compute a=
nd program SPRING paths

    * teas on generic traffic engineering architecture

=20

Please comment on the contents of the charter text on the list.

=20

Thanks,

Bruno & Rob
___________________________________________________________________________=
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=20
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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple><div class=3DWordSe=
ction1><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri=
",sans-serif'>Hi Bruno/Rob,<o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</o:p></s=
pan></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibr=
i",sans-serif'>Looks good, well done!<o:p></o:p></span></p><p class=3DMsoNorma=
l><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp=
;</o:p></span></p><div><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font=
-family:"Calibri",sans-serif;color:black'>Cheers,<o:p></o:p></span></p></div=
><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",sans=
-serif;color:black'>Jeff</span><span style=3D'font-size:11.0pt;font-family:"Ca=
libri",sans-serif'><o:p></o:p></span></p><div style=3D'border:none;border-top:=
solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span s=
tyle=3D'color:black'>From: </span></b><span style=3D'color:black'>spring &lt;spr=
ing-bounces@ietf.org&gt; on behalf of &lt;bruno.decraene@orange.com&gt;<br><=
b>Date: </b>Thursday, June 28, 2018 at 08:52<br><b>To: </b>SPRING WG List &l=
t;spring@ietf.org&gt;<br><b>Subject: </b>Re: [spring] Updating the SPRING WG=
 Charter<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'fon=
t-size:11.0pt'><o:p>&nbsp;</o:p></span></p></div><p class=3DMsoNormal><a name=3D=
"_MailOriginalBody"><span style=3D'font-size:10.0pt;font-family:"Arial",sans-s=
erif;color:black'>Hi SPRING,</span><o:p></o:p></a></p><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font=
-family:"Arial",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'=
font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Following the d=
iscussion on the mailing list, please find below the updated text.</span><o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:bl=
ack'>The plan is to send it to Martin end of this week.</span><o:p></o:p></s=
pan></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><spa=
n style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>&nbsp;=
</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";col=
or:black'>The Source Packet Routing in NetworkinG (SPRING) Working Group is =
the home of Segment Routing (SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRIN=
G WG serves as a forum to discuss SPRING networks operations, define new app=
lications, and specify extensions of Segment Routing technologies.</span><o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>=
&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookm=
ark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier Ne=
w";color:black'>The SPRING WG defines procedures that allow a node to steer =
a packet through an SR Policy instantiated as an ordered list of instruction=
s called segments and without the need for per-path state information to be =
held at transit nodes. Full explicit control (through loose or strict path s=
pecification) can be achieved in a network comprising only SPRING nodes, how=
ever SPRING nodes must inter-operate through loose routing in existing netwo=
rks and may find it advantageous to use loose routing for other network appl=
ications.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bo=
okmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier=
 New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font=
-family:"Courier New";color:black'>The scope of the SPRING WG work includes =
both single Autonomous System (AS) and multi-AS environments. Segment Routin=
g operates within a trusted domain; as described in the architecture, a node=
 imposing a segment list is assumed to be allowed to do so. Nonetheless, the=
 SPRING WG must strive to identify and address security considerations broug=
ht up by the technologies it defines.</span><o:p></o:p></span></p><p class=3DM=
soNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size=
:10.0pt;font-family:"Courier New";color:black'>The technologies SPRING WG de=
fines may be applicable to both centralised and distributed path computation=
.&nbsp; </span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>SPRING WG should avoid modification to exi=
sting data planes that would make them incompatible with existing deployment=
s. Where possible, existing control and management plane protocols must be u=
sed within existing architectures to implement the SPRING function. Any modi=
fication of -or extension to- existing architectures, data planes, or contro=
l or management plane protocols should be carried out in the WGs responsible=
 for the architecture, data plane, or control or management plane protocol b=
eing modified and in </span><o:p></o:p></span></p><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fam=
ily:"Courier New";color:black'>coordination with the SPRING WG, but may be d=
one in SPRING WG after agreement with all the relevant WG chairs and respons=
ible Area Directors.</span><o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fami=
ly:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:=
10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span=
></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span s=
tyle=3D'font-size:10.0pt;font-family:"Courier New";color:black'>The SPRING WG =
will manage its specific work items by milestones agreed with the responsibl=
e Area Director.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"=
Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0=
pt;font-family:"Courier New";color:black'>The work-items of the SPRING WG in=
clude functional specifications for:</span><o:p></o:p></span></p><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:=
10.0pt;font-family:"Courier New";color:black'>o Segment Routing policies and=
 the associated steering, signalling and traffic engineering mechanisms.</sp=
an><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:b=
lack'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Cour=
ier New";color:black'>o Source-routed stateless service chaining using SR-MP=
LS and SRv6 dataplanes.</span><o:p></o:p></span></p><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-f=
amily:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-si=
ze:10.0pt;font-family:"Courier New";color:black'>o SRv6 network programming =
for the underlay networks and overlay services, and including data plane beh=
avior and functions associated with SIDs</span><o:p></o:p></span></p><p clas=
s=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-s=
ize:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o Operatio=
n, Administration and Management (OAM), and traffic accounting in networks w=
ith SR-MPLS and SRv6 data planes in the case where SR introduces specificiti=
es compared to MPLS or IPv6 technologies.</span><o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-=
size:10.0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p><=
/span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><s=
pan style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o Perform=
ance Management (PM) and monitoring in networks with SR-MPLS and SRv6 data p=
lanes in the case where SR introduces specificities compared to MPLS or IPv6=
 technologies.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'm=
so-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Co=
urier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNorma=
l><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt=
;font-family:"Courier New";color:black'>o Inter-working between SRv6 and SR-=
MPLS&nbsp; and between SR and existing routing solutions to allow for seamle=
ss deployment and co-existence.. </span><o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.=
0pt;font-family:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span styl=
e=3D'font-size:10.0pt;font-family:"Courier New";color:black'>o new types of se=
gments mapping to forwarding behavior&nbsp; (e.g. local ingress replication,=
 local forwarding resources, a pre-existing replication structure) if needed=
 for new usages.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"=
Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0=
pt;font-family:"Courier New";color:black'>Any of the above may require archi=
tectural extensions.</span><o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fami=
ly:"Courier New";color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:=
10.0pt;font-family:"Courier New";color:black'>The work-items of SPRING WG al=
so include:</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-=
bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Couri=
er New";color:black'>o Specification of management models (YANG) for Segment=
 Routing applications, services and networks with SR-MPLS and SRv6 dataplane=
s.</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:=
_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";c=
olor:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span styl=
e=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family=
:"Courier New";color:black'>The SPRING WG will coordinate and collaborate wi=
th other WGs as needed. Specific</span><o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0=
pt;font-family:"Courier New";color:black'>expected interactions include (but=
 may not be limited to):</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * mpls on the MPLS data=
plane and OAM extensions,</span><o:p></o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font=
-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * 6man on the IPv6 dat=
aplane for SR and associated OAM extensions</span><o:p></o:p></span></p><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fon=
t-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * ls=
r on OSPF and IS-IS extensions to flood SPRING-related information</span><o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigina=
lBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>=
&nbsp;&nbsp;&nbsp; * IDR for BGP extensions</span><o:p></o:p></span></p><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fon=
t-size:10.0pt;font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * be=
ss for VPN control plane</span><o:p></o:p></span></p><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-=
family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp; * pce on extensions to =
communicate with an external entity to compute and program SPRING paths</spa=
n><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOr=
iginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:bl=
ack'>&nbsp;&nbsp;&nbsp; * teas on generic traffic engineering architecture</=
span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Courier New";color=
:black'>&nbsp;&nbsp;&nbsp; * sfc on service chaining applications</span><o:p=
></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'><span style=3D'font-size:10.0pt;font-family:"Courier New";color:black'>&=
nbsp;&nbsp;&nbsp; * rtgwg on fast-reroute technologies</span><o:p></o:p></sp=
an></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span=
 style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>&nbsp;<=
/span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif=
;color:black'>&nbsp;</span><o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-fami=
ly:"Arial",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-=
size:10.0pt;font-family:"Arial",sans-serif;color:black'>Thanks,</span><o:p><=
/o:p></span></p><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBo=
dy'><span style=3D'font-size:10.0pt;font-family:"Arial",sans-serif;color:black=
'>Rob, Bruno</span><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt;font-family:"Aria=
l",sans-serif;color:black'>&nbsp;</span><o:p></o:p></span></p><div style=3D'bo=
rder:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><b><span st=
yle=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif'>From:</span></b></spa=
n><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:10.0pt=
;font-family:"Tahoma",sans-serif'> spring [mailto:spring-bounces@ietf.org] <=
b>On Behalf Of </b>Rob Shakir<br><b>Sent:</b> Friday, June 01, 2018 6:06 PM<=
br><b>To:</b> SPRING WG List<br><b>Subject:</b> [spring] Updating the SPRING=
 WG Charter</span><o:p></o:p></span></p></div></div><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p><div><p =
class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Hi SPRING,<o:p>=
</o:p></span></p><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrig=
inalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'>After the discussions on the list and i=
n London relating to the charter, Bruno and I have been working to propose a=
 new charter for the WG with Martin, and the other routing ADs. The text for=
 this suggested charter is below. We would like to solicit WG feedback on th=
e charter text prior to Martin taking to the IESG. We'd like to try and get =
the charter agreed prior to IETF 102 in Montr=C3=A9al.<o:p></o:p></span></p></di=
v><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp=
;<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>The Sourc=
e Packet Routing in NetworkinG (SPRING) Working Group is the home of</span><=
o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark=
:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>Segment Routing =
(SR) using MPLS (SR-MPLS) and IPv6 (SRv6). SPRING WG serves as</span><o:p></=
o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mail=
OriginalBody'><span style=3D'font-family:"Courier New"'>a forum to discuss SPR=
ING networks operations, define new applications, and</span><o:p></o:p></spa=
n></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalB=
ody'><span style=3D'font-family:"Courier New"'>specify extensions of Segment R=
outing technologies.</span><o:p></o:p></span></p></div><div><p class=3DMsoNorm=
al><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p>=
</div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><=
span style=3D'font-family:"Courier New"'>The SPRING WG defines procedures that=
 allow a node to steer a packet through an</span><o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span =
style=3D'font-family:"Courier New"'>SR Policy instantiated as an ordered list =
of instructions called segments and</span><o:p></o:p></span></p></div><div><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'=
font-family:"Courier New"'>without the need for per-path state information t=
o be held at transit nodes.</span><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fam=
ily:"Courier New"'>Full explicit control (through loose or strict path speci=
fication) can be</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courie=
r New"'>achieved in a network comprising only SPRING nodes, however SPRING n=
odes must</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'=
>inter-operate through loose routing in existing networks and may find it</s=
pan><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>advantageou=
s to use loose routing for other network applications.</span><o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>The=
 scope of the SPRING WG work includes both single Autonomous System (AS) and=
</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-=
bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>multi-AS=
 environments. Segment Routing operates within a trusted domain; as</span><o=
:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:=
_MailOriginalBody'><span style=3D'font-family:"Courier New"'>described in the =
architecture, a node imposing a segment list is assumed to be</span><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-family:"Courier New"'>allowed to do so. Nonet=
heless, the SPRING WG must strive to identify and</span><o:p></o:p></span></=
p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'=
><span style=3D'font-family:"Courier New"'>address security considerations bro=
ught up by the technologies it defines.&nbsp; The</span><o:p></o:p></span></=
p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'=
><span style=3D'font-family:"Courier New"'>technologies SPRING WG defines may =
be applicable to both centralised and</span><o:p></o:p></span></p></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=
=3D'font-family:"Courier New"'>distributed path computation.</span><o:p></o:p>=
</span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrig=
inalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'=
>SPRING WG should avoid modification to existing data planes that would make=
</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-=
bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>them inc=
ompatible with existing deployments. Where possible, existing control</span>=
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmar=
k:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>and management =
plane protocols must be used within existing architectures to</span><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-family:"Courier New"'>implement the SPRING fu=
nction. Any modification of - or extension to - existing</span><o:p></o:p></=
span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigin=
alBody'><span style=3D'font-family:"Courier New"'>architectures, data planes, =
or control or management plane protocols should be</span><o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'><span style=3D'font-family:"Courier New"'>carried out in the WGs responsible=
 for the architecture, data plane, or control</span><o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>or management plane protocol being modi=
fied and in coordination with the SPRING</span><o:p></o:p></span></p></div><=
div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span st=
yle=3D'font-family:"Courier New"'>WG, but may be done in SPRING WG after agree=
ment with all the relevant WG</span><o:p></o:p></span></p></div><div><p clas=
s=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-f=
amily:"Courier New"'>chairs and responsible Area Directors.</span><o:p></o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=
=3D'font-family:"Courier New"'>The SPRING WG will manage its specific work ite=
ms by milestones agreed with the</span><o:p></o:p></span></p></div><div><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fon=
t-family:"Courier New"'>responsible Area Director.</span><o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody=
'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso=
-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>The wor=
k-items of the SPRING WG include functional specifications for:</span><o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><sp=
an style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier =
New"'>o Segment Routing policies and the associated steering and traffic eng=
ineering</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span sty=
le=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>=
&nbsp; mechanisms.</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal=
><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></=
div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><sp=
an style=3D'font-family:"Courier New"'>o Source-routed stateless service chain=
ing using SR-MPLS and SRv6 dataplanes.</span><o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p=
></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span style=3D'font-family:"Courier New"'>o SRv6 network prog=
ramming for the underlay networks and overlay services, and</span><o:p></o:p=
></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOri=
ginalBody'><span style=3D'font-family:"Courier New"'>&nbsp; including data pla=
ne behavior and functions associated with SIDs</span><o:p></o:p></span></p><=
/div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&n=
bsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-boo=
kmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>o Operation=
, Administration and Management (OAM), and traffic accounting in</span><o:p>=
</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Ma=
ilOriginalBody'><span style=3D'font-family:"Courier New"'>&nbsp; networks with=
 SR-MPLS and SRv6 data planes in the case where SR introduces</span><o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><span style=3D'font-family:"Courier New"'>&nbsp; specificities co=
mpared to MPLS or IPv6 technologies.</span><o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p><=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'><span style=3D'font-family:"Courier New"'>o Performance Managem=
ent (PM) and monitoring in networks with SR-MPLS and SRv6</span><o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-family:"Courier New"'>&nbsp; data planes in the c=
ase where SR introduces specificities compared to MPLS or</span><o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-family:"Courier New"'>&nbsp; IPv6 technologies.</=
span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bo=
okmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMs=
oNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-famil=
y:"Courier New"'>o The inter-working between SRv6 and SR-MPLS.</span><o:p></=
o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mail=
OriginalBody'>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier N=
ew"'>o Using SR as the mechanism to identify sets of resources in networks w=
ith</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'm=
so-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courier New"'>&nbsp=
; SR-MPLS and SRv6 dataplanes.</span><o:p></o:p></span></p></div><div><p cla=
ss=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-family:"Courier New"'>Any of the above may requir=
e architectural extensions.</span><o:p></o:p></span></p></div><div><p class=3D=
MsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></sp=
an></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginal=
Body'><span style=3D'font-family:"Courier New"'>The work-items of SPRING WG al=
so include:</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span styl=
e=3D'font-family:"Courier New"'>o Specification of management models (YANG) fo=
r Segment Routing applications,</span><o:p></o:p></span></p></div><div><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font=
-family:"Courier New"'>&nbsp; services and networks with SR-MPLS and SRv6 da=
taplanes.</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span st=
yle=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D=
'font-family:"Courier New"'>The SPRING WG will coordinate and collaborate wi=
th other WGs as needed. Specific</span><o:p></o:p></span></p></div><div><p c=
lass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fon=
t-family:"Courier New"'>expected interactions include (but may not be limite=
d to):</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=
=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'fo=
nt-family:"Courier New"'>&nbsp;&nbsp;&nbsp; * mpls on the MPLS dataplane and=
 OAM extensions,</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courie=
r New"'>&nbsp;&nbsp;&nbsp; * 6man on the IPv6 dataplane for SR and associate=
d OAM extensions</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"Courie=
r New"'>&nbsp;&nbsp;&nbsp; * lsr on OSPF and IS-IS extensions to flood SPRIN=
G-related information</span><o:p></o:p></span></p></div><div><p class=3DMsoNor=
mal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-family:"C=
ourier New"'>&nbsp; &nbsp; &nbsp; &nbsp; * idr for BGP extensions</span><o:p=
></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_M=
ailOriginalBody'><span style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp; =
* bess for VPN control plane</span><o:p></o:p></span></p></div><div><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-fa=
mily:"Courier New"'>&nbsp;&nbsp;&nbsp; * pce on extensions to communicate wi=
th an external entity to compute and program SPRING paths</span><o:p></o:p><=
/span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOrigi=
nalBody'><span style=3D'font-family:"Courier New"'>&nbsp;&nbsp;&nbsp; * teas o=
n generic traffic engineering architecture</span><o:p></o:p></span></p></div=
></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=
&nbsp;<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span style=3D'=
mso-bookmark:_MailOriginalBody'>Please comment on the contents of the charte=
r text on the list.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'>&nbsp;<o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Thanks,<o=
:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:=
_MailOriginalBody'>Bruno &amp; Rob<o:p></o:p></span></p></div></div></div></=
div><pre><span style=3D'mso-bookmark:_MailOriginalBody'>______________________=
____________________________________________________________________________=
_______________________<o:p></o:p></span></pre><pre><span style=3D'mso-bookmar=
k:_MailOriginalBody'><o:p>&nbsp;</o:p></span></pre><pre><span style=3D'mso-boo=
kmark:_MailOriginalBody'>Ce message et ses pieces jointes peuvent contenir d=
es informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p=
></span></pre><pre><span style=3D'mso-bookmark:_MailOriginalBody'>pas etre dif=
fuses, exploites ou copies sans autorisation. Si vous avez recu ce message p=
ar erreur, veuillez le signaler<o:p></o:p></span></pre><pre><span style=3D'mso=
-bookmark:_MailOriginalBody'>a l'expediteur et le detruire ainsi que les pie=
ces jointes. Les messages electroniques etant susceptibles d'alteration,<o:p=
></o:p></span></pre><pre><span style=3D'mso-bookmark:_MailOriginalBody'>Orange=
 decline toute responsabilite si ce message a ete altere, deforme ou falsifi=
e. Merci.<o:p></o:p></span></pre><pre><span style=3D'mso-bookmark:_MailOrigina=
lBody'><o:p>&nbsp;</o:p></span></pre><pre><span style=3D'mso-bookmark:_MailOri=
ginalBody'>This message and its attachments may contain confidential or priv=
ileged information that may be protected by law;<o:p></o:p></span></pre><pre=
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d, changed or falsified.<o:p></o:p></span></pre><pre><span style=3D'mso-bookma=
rk:_MailOriginalBody'>Thank you.<o:p></o:p></span></pre><p class=3DMsoNormal><=
span style=3D'mso-bookmark:_MailOriginalBody'><span style=3D'font-size:11.0pt;fo=
nt-family:"Calibri",sans-serif'>____________________________________________=
___ spring mailing list spring@ietf.org https://www.ietf.org/mailman/listinf=
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ans-serif'><o:p></o:p></span></p></div></body></html>

--B_3613119434_2124518780--




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Subject: Re: [spring] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

>From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

____________________________________________________________________________
_____________________________________________

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erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les
pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou
falsifie. Merci.

This message and its attachments may contain confidential or privileged
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used or copied without authorisation.
If you have received this email in error, please notify the sender and
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Thank you.

_______________________________________________
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From: guntervandeveldecc@icloud.com
To: stephane.litkowski@orange.com, "'Van De Velde, Gunter (Nokia - BE/Antwerp)'" <gunter.van_de_velde@nokia.com>,  "'Ketan Talaulikar (ketant)'" <ketant@cisco.com>, idr@ietf.org, lsr@ietf.org,  spring@ietf.org, Susan Hares <shares@ndzh.com>
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Subject: Re: [spring] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hope all is well with all.




I'll be happy to discuss in Montreal. Between now and then i am on vscation, so no new text from my side. Lsts better discuss first at IETF102.




G/




Gunter Van de Velde







On Fri, Jun 29, 2018 at 8:58 PM +0200, "Susan Hares" <shares@ndzh.com> wrote:










Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)

Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) ; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

>From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr  On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

____________________________________________________________________________
_____________________________________________

Ce message et ses pieces jointes peuvent contenir des informations
confidentielles ou privilegiees et ne doivent donc pas etre diffuses,
exploites ou copies sans autorisation. Si vous avez recu ce message par
erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les
pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou
falsifie. Merci.

This message and its attachments may contain confidential or privileged
information that may be protected by law; they should not be distributed,
used or copied without authorisation.
If you have received this email in error, please notify the sender and
delete this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been
modified, changed or falsified.
Thank you.

_______________________________________________
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Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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<html><head></head><body><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">Hope all is well with all.<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">I'll be happy to discuss in Montreal. Between now and then i am on vscation, so no new text from my side. Lsts better discuss first at IETF102.<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">G/<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; "><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">Gunter Van de Velde</div>
<br>
</div>
<br><br><br>
<div class="gmail_quote">On Fri, Jun 29, 2018 at 8:58 PM +0200, "Susan Hares" <span dir="ltr">&lt;<a href="mailto:shares@ndzh.com" target="_blank">shares@ndzh.com</a>&gt;</span> wrote:<br>
<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




<div dir="3D&quot;ltr&quot;">
<pre>Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

&gt;From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
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https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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</idr-bounces@ietf.org></gunter.van_de_velde@nokia.com></ketant@cisco.com></gunter.van_de_velde@nokia.com></gunter.van_de_velde@nokia.com></pre>
</div>

</blockquote>
</div>
</body></html>
------=_Part_6218_1609624426.1530301709928--


From nobody Fri Jun 29 20:02:01 2018
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Subject: [spring] Spencer Dawkins' No Objection on charter-ietf-spring-01-01: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
charter-ietf-spring-01-01: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)



The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/charter-ietf-spring/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm balloting No Objection, but hope that people look at the SPRING/IPPM
interaction I mentioned below. Otherwise, this is mostly editorial.

I'm not sure who or what finds it advantageous to use loose routing in this
text -

"Full explicit control (through loose or strict
path specification) can be achieved in a network comprising only SPRING
nodes, however SPRING nodes must inter-operate through loose routing in
existing networks and may find it advantageous to use loose routing for
other network applications."

I THINK the reference is to a SPRING node, which doesn't make a lot of sense to
me, but I'm guessing.

Does everyone else know what "specificities" are meant here?

"o Operation, Administration and Management (OAM), and traffic accounting
in networks with SR-MPLS and SRv6 data planes in the case where SR
introduces specificities compared to MPLS or IPv6 technologies."

and

"o Performance Management (PM) and monitoring in networks with SR-MPLS
and SRv6 data planes in the case where SR introduces specificities
compared to MPLS or IPv6 technologies."

On "Performance Management and monitoring", I note that
https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-data/ includes Segment
Routing as one of its targeted encapsulations. IPPM is Mirja's working group as
of about a month ago, but I'm wondering what the overlap might be. Is this
something the two groups/ADs have talked about?

It might be less surprising to readers if the working group names under

"Specific expected interactions"

were capitalized.



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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "'idr@ietf. org'" <idr@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Update to draft-ietf-idr-te-lsp-distribution-09 for SR Policy reporting
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Hello All,

An updated version of this draft that specifies the reporting of TE Policie=
s via BGP-LS has been posted yesterday.

The major updates are related to the reporting of SR Policies to bring it i=
n alignment with the draft-ietf-spring-segment-routing-policy which was rec=
ently adopted by the SPRING WG.

Comments and inputs are welcome.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
Sent: 29 June 2018 16:23
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-te-lsp-distribution-09.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Distribution of Traffic Engineering (TE) Policies=
 and State using BGP-LS
        Authors         : Stefano Previdi
                          Ketan Talaulikar
                          Jie Dong
                          Mach(Guoyi) Chen
                          Hannes Gredler
                          Jeff Tantsura
	Filename        : draft-ietf-idr-te-lsp-distribution-09.txt
	Pages           : 47
	Date            : 2018-06-29

Abstract:
   This document describes a mechanism to collect the Traffic
   Engineering and Policy information that is locally available in a
   node and advertise it into BGP-LS updates.  Such information can be
   used by external components for path computation, re-optimization,
   service placement, network visualization, etc.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-te-lsp-distribution/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-te-lsp-distribution-09
https://datatracker.ietf.org/doc/html/draft-ietf-idr-te-lsp-distribution-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-te-lsp-distribution-09


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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