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Subject: [mpls] I-D Action: draft-ietf-mpls-tp-temporal-hitless-psm-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 Multiprotocol Label Switching of the IETF.

        Title           : Hitless path segment monitoring
        Authors         : Alessandro D'Alessandro
                          Loa Andersson
                          Satoshi Ueno
                          Kaoru Arai
                          Yoshinori Koike
	Filename        : draft-ietf-mpls-tp-temporal-hitless-psm-12.txt
	Pages           : 16
	Date            : 2017-02-01

Abstract:
   One of the most important OAM capabilities for transport network
   operation is fault localisation.  An in-service, on-demand segment
   monitoring function of a transport path is indispensable,
   particularly when the service monitoring function is activated only
   between end points.  However, the current segment monitoring approach
   defined for MPLS (including the transport profile (MPLS-TP)) in RFC
   6371 [RFC6371] has drawbacks.  This document provides an analysis of
   the existing MPLS-TP OAM mechanisms for the path segment monitoring
   and provides requirements to guide the development of new OAM tools
   to support a Hitless Path Segment Monitoring (HPSM).


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-temporal-hitless-psm/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-tp-temporal-hitless-psm-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-tp-temporal-hitless-psm-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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From: Uma Chunduri <uma.chunduri@huawei.com>
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--_000_25B4902B1192E84696414485F57268540187FAF7SJCEML703CHMchi_--



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Date: Wed, 01 Feb 2017 10:47:52 -0800
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Uma Chunduri <uma.chunduri@huawei.com>
Message-ID: <7072E8DD-4C10-4335-91D4-BC65FE5BFE41@gmail.com>
Thread-Topic: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
References: <f56d7fa5-8a6a-69fe-2779-9c11e5e85e5b@pi.nu> <d4ba0355c0db469ebbbb896717c5f911@XCH-ALN-001.cisco.com> <CA+RyBmXQxvg9k0f75f72PTGkVtQ0z3TUsMGjb38_E8eKvscX6w@mail.gmail.com> <3fa098bb1ca644e98eee3c470d8c05a4@XCH-ALN-001.cisco.com> <CA+RyBmWZZmHuwy3xWQxRLz5jTLYpvFd-NADfuE_TygVk=JDbYA@mail.gmail.com> <51a1f73605a44fafbab0a293c868bc88@XCH-ALN-001.cisco.com> <CA+RyBmV2OEp_TzSqMxH8pWxBP4sihLoY91fnSZ1eLgcxO35HzA@mail.gmail.com> <2baf22cab3c747498221800e7775fab4@XCH-ALN-001.cisco.com> <25B4902B1192E84696414485F57268540187F922@SJCEML703-CHM.china.huawei.com> <CA+RyBmWBTxiA35uBG6icAaxkMkLp=Vr662oYdE8Qse8UqeHhwQ@mail.gmail.com>
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Cc: "Les Ginsberg \(ginsberg\)" <ginsberg@cisco.com>, "isis-chairs@ietf.org" <isis-chairs@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "draft-ietf-mpls-residence-time@tools.ietf.org" <draft-ietf-mpls-residence-time@tools.ietf.org>, TEAS WG Chairs <teas-chairs@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, TEAS WG <teas@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, Isis-wg <isis-wg-bounces@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
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Greg,

=20

Looks good!

=20

Cheers,

Jeff

=20

=20

From: mpls <mpls-bounces@ietf.org> on behalf of Greg Mirsky <gregimirsky@gm=
ail.com>
Date: Tuesday, January 31, 2017 at 19:18
To: Uma Chunduri <uma.chunduri@huawei.com>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "isis-chairs@ietf.org" =
<isis-chairs@ietf.org>, Isis-wg <isis-wg-bounces@ietf.org>, "draft-ietf-mpls=
-residence-time@tools.ietf.org" <draft-ietf-mpls-residence-time@tools.ietf.o=
rg>, "mpls@ietf.org" <mpls@ietf.org>, TEAS WG Chairs <teas-chairs@ietf.org>,=
 "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, TEAS WG <teas@ietf.org>, "os=
pf@ietf.org" <ospf@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time

=20

Hi Uma, Acee, Les, et. al,

attached please find diff and the updated version. I think I've got it righ=
t by now.

Greatly appreciate your comments.

=20

Regards,

Greg

=20

On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri <uma.chunduri@huawei.com> wr=
ote:

Had a quick look at this diff.

=20

This is about unifying the encoding parts in IGP to have a consistent view =
for BGP-LS encoding or keeping these separate and yet having a correct repre=
sentation in BGP-LS for both IGPs.

=20

=3D=3D

With variable length bit field for Section 4.5 and fixed 4 byte value (as i=
ndicated as MUST  for length) in section 4.3  - I saw a discrepancy  in sect=
ion 4.6 (BGP-LS) which is referencing section 4.3.

=20

You have multiple options to fix this:

=20

1.       Change section 4.3 to match section 4.5 (I am not sure why we have=
 to have variable length for this bit field to start with in this case like =
rfc 7794=E2=80=A6but I won=E2=80=99t say much now)

2.       Change Section 4.6 to represent differences in encoding section 4.=
5 and 4.3 correctly.

=E2=80=9CLength, RTM, and Reserved fields as defined in Section 4.3.=E2=80=9D

   3. Lastly unify section 4.5 to 4.3  i.e., 4 byte value with 3 bits defin=
ed and 29 bits reserved.

--

Uma C.

=20

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsbe=
rg)
Sent: Tuesday, January 31, 2017 8:22 AM
To: Greg Mirsky <gregimirsky@gmail.com>
Cc: mpls@ietf.org; isis-chairs@ietf.org; Isis-wg <isis-wg-bounces@ietf.org>=
; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs <teas-chairs=
@ietf.org>; mpls-chairs@ietf.org; TEAS WG <teas@ietf.org>; ospf@ietf.org; os=
pf-chairs@ietf.org
Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time

=20

Greg =E2=80=93

=20

Looks good.

=20

   Les

=20

From: Greg Mirsky [mailto:gregimirsky@gmail.com]=20
Sent: Tuesday, January 31, 2017 8:06 AM
To: Les Ginsberg (ginsberg)
Cc: Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg; ospf-cha=
irs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs;=
 isis-chairs@ietf.org; mpls-chairs@ietf.org
Subject: Re: [OSPF] Working group last call on draft-ietf-mpls-residence-ti=
me

=20

Hi Les,

thank you for your patience and apologies for missing it.

Diff and the update been attached.

=20

Regards,

Greg

=20

On Tue, Jan 31, 2017 at 5:07 AM, Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m> wrote:

Greg =E2=80=93

=20

Almost=E2=80=A6

=20

Please change the title of Section 7.5 to =E2=80=9CIS-IS RTM Capability sub-TLV=E2=80=
=9D.

=20

Please change the title of Table 5 to =E2=80=9CIS-IS RTM Capability sub-TLV Regis=
try Description=E2=80=9D.

=20

The common point being since this is not exclusively for TLV 22 we do not w=
ant to say =E2=80=9Cfor TLV 22=E2=80=9D.

Thanx.

=20

    Les

=20

=20

From: Greg Mirsky [mailto:gregimirsky@gmail.com]=20
Sent: Monday, January 30, 2017 11:43 PM


To: Les Ginsberg (ginsberg)
Cc: Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg; ospf-cha=
irs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs;=
 isis-chairs@ietf.org; mpls-chairs@ietf.org
Subject: Re: [OSPF] Working group last call on draft-ietf-mpls-residence-ti=
me

=20

Hi Les,

many thanks for your the most detailed suggestions. Hope I've it right.

=20

Regards,

Greg

=20

On Mon, Jan 30, 2017 at 11:04 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.c=
om> wrote:

Greg =E2=80=93

=20

Thanx for the quick turnaround.

=20

Section 4.5 (revised text)

=20

   The capability to support RTM on a particular link (interface) is

   advertised in a new sub-TLV which may be included in TLVs advertising

   Intemediate System (IS) Reachability on a specific link (TLVs 22, 23, 22=
2, and 223).

=20

   The format for the RTM Capabilities sub-TLV is presented in Figure 5

=20

     0                   1                   2

     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...

    |      Type     |     Length    | RTM |              ...

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...

=20

   Figure 5: RTM Capability sub-TLV

=20

=E2=80=A6 (Remainder unchanged)

=20

Section 7.5 (revised text)

=20

7.5.  IS-IS RTM Capability sub-TLV=20

=20

   IANA is requested to assign a new Type for RTM capability sub-TLV

   from the Sub-TLVs for TLVs 22, 23, 141, 222, and 223 registry as

   follows:

=20

    +------+-------------+----+----+-----+-----+-----+---------------+

    | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference     |

    +------+-------------+----+----+-----+-----+-----+---------------+

    | TBA3 |     RTM      | y  | y  | n   | y   | y   | This document |

    |           | Capability |      |     |      |       |      |          =
                      |

    +------+-------------+----+----+-----+-----+-----+---------------+

=20

             Table 5: IS-IS RTM Capability sub-TLV Registry Description

=20

=20

Thanx.

=20

    Les

=20

From: Greg Mirsky [mailto:gregimirsky@gmail.com]=20
Sent: Monday, January 30, 2017 10:36 PM
To: Les Ginsberg (ginsberg)
Cc: Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg; ospf-cha=
irs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs;=
 isis-chairs@ietf.org; mpls-chairs@ietf.org
Subject: Re: [OSPF] Working group last call on draft-ietf-mpls-residence-ti=
me

=20

Hi Les,

attached are diff and the updated version -14. Would be much obliged to hea=
r from you if the updates are according to your suggestions and address your=
 comments.

=20

Kind regards,

Greg

=20

=20

On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m> wrote:

Loa -

=20

The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to adver=
tise RTM capability is a better solution than the previous proposal and this=
 has my support.

However, there are some details as regards the proposed sub-TLV that should=
 be revised.

=20

1)Rather than use a fixed 16 bit field for the flags I suggest you utilize =
the encoding style introduced in RFC 7794 (see Section 2.1) which allows for=
 a variable length flags field. This addresses two issues:

=20

   o You need never worry that the size of the flags field will be too smal=
l for future extensions

   o It minimizes the number of bytes required to be sent

=20

The latter point is something IS-IS has always been more conservative about=
 than OSPF because of the fixed size of an LSP set which can be advertised b=
y a single router.

=20

2)In the IANA considerations you have limited the sub-TLV to being used in =
TLV 22 only, but there is no reason to do so. This does not allow MT to be s=
upported and it needlessly prevents use of the sub-TLV by the RFC 5311 exten=
sions (however unpopular those may be). I can understand why the sub-TLV may=
 not be useful in TLV 141, therefore I suggest the table in Section 7.5 be r=
evised to be:

=20

=20

    | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference     |     =
        =20

   +------+-------------+----+----+-----+-----+-----+---------------+    =20

  | TBA3 |    RTM       | y  | y  | n   | y   | y   | This document |      =
  =20

    +------+-------------+----+----+-----+-----+-----+---------------+    =20

=20

i.e. "y" for all but TLV 141 (in case the ASCII art doesn't translate well =
in your mailer).

=20

You should also remove the reference to RFC 5305 in Section 4.5 as it is to=
o limiting. Simply referencing the IANA registry http://www.iana.org/assignm=
ents/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23=
-141-222-223 should be sufficient. All necessary references can be found the=
re.

=20

3)An editorial correction:

=20

Introduction 3rd paragraph:

=20

s/ Althugh/ Although

=20

   Les

=20

> -----Original Message-----

> From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Loa Andersson

> Sent: Monday, January 30, 2017 8:02 AM

> To: mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg

> Cc: isis-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; =
TEAS

> WG Chairs; mpls-chairs@ietf.org; ospf-chairs@ietf.org

> Subject: [OSPF] Working group last call on draft-ietf-mpls-residence-time

>=20

> Working Groups,

>=20

> This is to initiate a two week working group last call in four working gr=
oups on

> draft-ietf-mpls-residence-time-13.

>=20

> The MPLS working group has done an earlier working group last call and a

> request for publication has been made.

>=20

> The changes to the document were such that we decided to do a new

> working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.

>=20

> There are three major changes between the version of the document for

> which publication was requested are:

>=20

> (1) that section 7 " One-step Clock and Two-step Clock Modes" has been

>      moved up to become section 2.1.

> (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM

>      Capability when IS-IS used advertise RTM capabilities

> (3) BGP-LS has been added as a RTM capability advertisement method

>=20

> A side-by-side diff between version -12 and -13 is available at:

> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residence-time-13

>=20

> Please send your comments to the mpls wg mailing list (mpls@ietf.org), if

> you are not subscribed to the mpls wg list, send to "your own"

> working group mailing list, and we'll make sure they are posted to the MP=
LS

> wg list.

>=20

> There were one IPR disclosure against this document.

>=20

> All the authors and contributors have stated on the working group mailing=
 list

> that they are not aware of any other IPRs that relates to this document.

>=20

> This working group last call ends February 13, 2017.

>=20

>=20

> /Loa

> MPLS wg co-chairs

> --

>=20

>=20

> Loa Andersson                        email: loa@mail01.huawei.com

> Senior MPLS Expert                          loa@pi.nu

> Huawei Technologies (consultant)     phone: +46 739 81 21 64

>=20

> _______________________________________________

> OSPF mailing list

> OSPF@ietf.org

> https://www.ietf.org/mailman/listinfo/ospf


_______________________________________________
OSPF mailing list
OSPF@ietf.org
https://www.ietf.org/mailman/listinfo/ospf

=20

=20

=20

=20

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


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--></style></head><body bgcolor=3Dwhite lang=3DEN-US link=3Dblue vlink=3Dpurple><di=
v class=3DWordSection1><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-f=
amily:Calibri'>Greg,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'fo=
nt-size:11.0pt;font-family:Calibri'><o:p>&nbsp;</o:p></span></p><p class=3DMso=
Normal><span style=3D'font-size:11.0pt;font-family:Calibri'>Looks good!<o:p></=
o:p></span></p><div><p class=3DMsoNormal><span style=3D'font-size:10.5pt;font-fa=
mily:Calibri;color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><sp=
an style=3D'font-size:10.5pt;font-family:Calibri;color:black'>Cheers,<o:p></o:=
p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.5pt;font-family:Ca=
libri;color:black'>Jeff<o:p></o:p></span></p></div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:Calibri'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:Calibri'><o:p>&nbs=
p;</o:p></span></p><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;pa=
dding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'font-family:Cali=
bri;color:black'>From: </span></b><span style=3D'font-family:Calibri;color:bla=
ck'>mpls &lt;mpls-bounces@ietf.org&gt; on behalf of Greg Mirsky &lt;gregimir=
sky@gmail.com&gt;<br><b>Date: </b>Tuesday, January 31, 2017 at 19:18<br><b>T=
o: </b>Uma Chunduri &lt;uma.chunduri@huawei.com&gt;<br><b>Cc: </b>&quot;Les =
Ginsberg (ginsberg)&quot; &lt;ginsberg@cisco.com&gt;, &quot;isis-chairs@ietf=
.org&quot; &lt;isis-chairs@ietf.org&gt;, Isis-wg &lt;isis-wg-bounces@ietf.or=
g&gt;, &quot;draft-ietf-mpls-residence-time@tools.ietf.org&quot; &lt;draft-i=
etf-mpls-residence-time@tools.ietf.org&gt;, &quot;mpls@ietf.org&quot; &lt;mp=
ls@ietf.org&gt;, TEAS WG Chairs &lt;teas-chairs@ietf.org&gt;, &quot;mpls-cha=
irs@ietf.org&quot; &lt;mpls-chairs@ietf.org&gt;, TEAS WG &lt;teas@ietf.org&g=
t;, &quot;ospf@ietf.org&quot; &lt;ospf@ietf.org&gt;, &quot;ospf-chairs@ietf.=
org&quot; &lt;ospf-chairs@ietf.org&gt;<br><b>Subject: </b>Re: [mpls] [OSPF] =
Working group last call on draft-ietf-mpls-residence-time<o:p></o:p></span><=
/p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMs=
oNormal>Hi Uma, Acee, Les, et. al,<o:p></o:p></p><div><p class=3DMsoNormal>att=
ached please find diff and the updated version. I think I've got it right by=
 now.<o:p></o:p></p></div><div><p class=3DMsoNormal>Greatly appreciate your co=
mments.<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></d=
iv><div><p class=3DMsoNormal>Regards,<o:p></o:p></p></div><div><p class=3DMsoNor=
mal>Greg<o:p></o:p></p></div></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p>=
</p><div><p class=3DMsoNormal>On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri &=
lt;<a href=3D"mailto:uma.chunduri@huawei.com" target=3D"_blank">uma.chunduri@hua=
wei.com</a>&gt; wrote:<o:p></o:p></p><blockquote style=3D'border:none;border-l=
eft:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-r=
ight:0in'><div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto'><a name=3D"m_-2344136845194405828__MailEndCompose"><span=
 style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>Had a quick look=
 at this diff.</span></a><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin=
-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font=
-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNorma=
l style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'fo=
nt-size:11.0pt;font-family:Calibri;color:#1F497D'>This is about unifying the=
 encoding parts in IGP to have a consistent view for BGP-LS encoding or keep=
ing these separate and yet having a correct representation in BGP-LS for bot=
h IGPs.</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Cal=
ibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'ms=
o-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.=
0pt;font-family:Calibri;color:#1F497D'>=3D=3D</span><o:p></o:p></p><p class=3DMsoN=
ormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=
=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>With variable length b=
it field for Section 4.5 and fixed 4 byte value (as indicated as MUST &nbsp;=
for length) in section 4.3 &nbsp;- I saw a discrepancy &nbsp;in section 4.6 =
(BGP-LS) which is referencing section 4.3.</span><o:p></o:p></p><p class=3DMso=
Normal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span styl=
e=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o=
:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>Yo=
u have multiple options to fix this:</span><o:p></o:p></p><p class=3DMsoNormal=
 style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'fon=
t-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p=
><p class=3Dm-2344136845194405828msolistparagraph><span style=3D'font-size:11.0p=
t;font-family:Calibri;color:#1F497D'>1.</span><span style=3D'font-size:7.0pt;c=
olor:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span style=3D'font-=
size:11.0pt;font-family:Calibri;color:#1F497D'>Change section 4.3 to match s=
ection 4.5 (I am not sure why we have to have variable length for this bit f=
ield to start with in this case like rfc 7794&#8230;but I won&#8217;t say mu=
ch now)</span><o:p></o:p></p><p class=3Dm-2344136845194405828msolistparagraph>=
<span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>2.</span><s=
pan style=3D'font-size:7.0pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; </span><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>C=
hange Section 4.6 to represent differences in encoding section 4.5 and 4.3 c=
orrectly.</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:=
auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in;text-autos=
pace:none'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>=
&#8220;</span><span style=3D'font-size:10.0pt;font-family:"Lucida Console"'>Le=
ngth, RTM, and Reserved fields as defined in Section 4.3.&#8221;</span><o:p>=
</o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-botto=
m-alt:auto;text-autospace:none'><span style=3D'font-size:10.0pt;font-family:"L=
ucida Console"'>&nbsp;&nbsp; 3. </span><span style=3D'font-size:11.0pt;font-fa=
mily:Calibri;color:#1F497D'>Lastly unify section 4.5 to 4.3 &nbsp;i.e., 4 by=
te value with 3 bits defined and 29 bits reserved.</span><o:p></o:p></p><div=
><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:aut=
o'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>--</span=
><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin=
-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1=
F497D'>Uma C.</span><o:p></o:p></p></div><p class=3DMsoNormal style=3D'mso-margi=
n-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;fon=
t-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><div><div style=3D=
'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p cl=
ass=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b>=
<span style=3D'font-size:11.0pt;font-family:Calibri'>From:</span></b><span sty=
le=3D'font-size:11.0pt;font-family:Calibri'> mpls [mailto:<a href=3D"mailto:mpls=
-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a>] <b>On Behalf O=
f </b>Les Ginsberg (ginsberg)<br><b>Sent:</b> Tuesday, January 31, 2017 8:22=
 AM<br><b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" tar=
get=3D"_blank">gregimirsky@gmail.com</a>&gt;<br><b>Cc:</b> <a href=3D"mailto:mpl=
s@ietf.org" target=3D"_blank">mpls@ietf.org</a>; <a href=3D"mailto:isis-chairs@i=
etf.org" target=3D"_blank">isis-chairs@ietf.org</a>; Isis-wg &lt;<a href=3D"mail=
to:isis-wg-bounces@ietf.org" target=3D"_blank">isis-wg-bounces@ietf.org</a>&gt=
;; <a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"_b=
lank">draft-ietf-mpls-residence-time@tools.ietf.org</a>; TEAS WG Chairs &lt;=
<a href=3D"mailto:teas-chairs@ietf.org" target=3D"_blank">teas-chairs@ietf.org</=
a>&gt;; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ie=
tf.org</a>; TEAS WG &lt;<a href=3D"mailto:teas@ietf.org" target=3D"_blank">teas@=
ietf.org</a>&gt;; <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.o=
rg</a>; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ie=
tf.org</a><br><b>Subject:</b> Re: [mpls] [OSPF] Working group last call on d=
raft-ietf-mpls-residence-time</span><o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&=
nbsp;<o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;colo=
r:#1F497D'>Greg &#8211;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-m=
argin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt=
;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMso=
Normal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span styl=
e=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>Looks good.</span><o:=
p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bot=
tom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497=
D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:=
auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:C=
alibri;color:#1F497D'>&nbsp;&nbsp; Les</span><o:p></o:p></p><p class=3DMsoNorm=
al style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'f=
ont-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p><=
/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=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-marg=
in-bottom-alt:auto'><b><span style=3D'font-size:10.0pt;font-family:Tahoma'>Fro=
m:</span></b><span style=3D'font-size:10.0pt;font-family:Tahoma'> Greg Mirsky =
[<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">mailto:gregimirsky@g=
mail.com</a>] <br><b>Sent:</b> Tuesday, January 31, 2017 8:06 AM<br><b>To:</=
b> Les Ginsberg (ginsberg)<br><b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls=
@ietf.org" target=3D"_blank">mpls@ietf.org</a>; TEAS WG; <a href=3D"mailto:ospf@=
ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-wg; <a href=3D"mailto:ospf-c=
hairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.org</a>; <a href=3D"mailto:dr=
aft-ietf-mpls-residence-time@tools.ietf.org" target=3D"_blank">draft-ietf-mpls=
-residence-time@tools.ietf.org</a>; TEAS WG Chairs; <a href=3D"mailto:isis-cha=
irs@ietf.org" target=3D"_blank">isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls=
-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.org</a><br><b>Subject:</b=
> Re: [OSPF] Working group last call on draft-ietf-mpls-residence-time</span=
><o:p></o:p></p></div></div><p class=3DMsoNormal style=3D'mso-margin-top-alt:aut=
o;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p><div><p class=3DMsoNormal s=
tyle=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi Les,<o:p></o:p>=
</p><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom=
-alt:auto'>thank you for your patience and apologies for missing it.<o:p></o=
:p></p></div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-marg=
in-bottom-alt:auto'>Diff and the update been attached.<o:p></o:p></p></div><=
div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:=
auto'>&nbsp;<o:p></o:p></p></div><div><p class=3DMsoNormal style=3D'mso-margin-t=
op-alt:auto;mso-margin-bottom-alt:auto'>Regards,<o:p></o:p></p></div><div><p=
 class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>=
Greg<o:p></o:p></p></div></div><div><p class=3DMsoNormal style=3D'mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p><div><p class=3DMso=
Normal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Tue, Ja=
n 31, 2017 at 5:07 AM, Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@=
cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt; wrote:<o:p></o:p></p><=
div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom=
-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>=
Greg &#8211;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-famil=
y:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal styl=
e=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-siz=
e:11.0pt;font-family:Calibri;color:#1F497D'>Almost&#8230;</span><o:p></o:p><=
/p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:a=
uto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;=
</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-=
margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;co=
lor:#1F497D'>Please change the title of Section 7.5 to &#8220;IS-IS RTM Capa=
bility sub-TLV&#8221;.</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-ma=
rgin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;=
font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoN=
ormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=
=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>Please change the titl=
e of Table 5 to &#8220;IS-IS RTM Capability sub-TLV Registry Description&#82=
21;.</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;=
mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibr=
i;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-m=
argin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt=
;font-family:Calibri;color:#1F497D'>The common point being since this is not=
 exclusively for TLV 22 we do not want to say &#8220;for TLV 22&#8221;.</spa=
n><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margi=
n-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#=
1F497D'>Thanx.</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-fam=
ily:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal st=
yle=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-s=
ize:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; Les</span><=
o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F4=
97D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-al=
t:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family=
:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><div style=3D'border:none;=
border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style=3D'bor=
der:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3D=
MsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><spa=
n style=3D'font-size:10.0pt;font-family:Tahoma'>From:</span></b><span style=3D'f=
ont-size:10.0pt;font-family:Tahoma'> Greg Mirsky [mailto:<a href=3D"mailto:gre=
gimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>] <br><b>Sent:<=
/b> Monday, January 30, 2017 11:43 PM</span><o:p></o:p></p><div><div><p clas=
s=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br><=
b>To:</b> Les Ginsberg (ginsberg)<br><b>Cc:</b> Loa Andersson; <a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>; TEAS WG; <a href=3D"mailt=
o:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-wg; <a href=3D"mailto=
:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.org</a>; <a href=3D"ma=
ilto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"_blank">draft-ie=
tf-mpls-residence-time@tools.ietf.org</a>; TEAS WG Chairs; <a href=3D"mailto:i=
sis-chairs@ietf.org" target=3D"_blank">isis-chairs@ietf.org</a>; <a href=3D"mail=
to:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.org</a><br><b>Subj=
ect:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-residence-tim=
e<o:p></o:p></p></div></div></div></div><div><div><p class=3DMsoNormal style=3D'=
mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p><di=
v><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:au=
to'>Hi Les,<o:p></o:p></p><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:=
auto;mso-margin-bottom-alt:auto'>many thanks for your the most detailed sugg=
estions. Hope I've it right.<o:p></o:p></p></div><div><p class=3DMsoNormal sty=
le=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p=
></div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bot=
tom-alt:auto'>Regards,<o:p></o:p></p></div><div><p class=3DMsoNormal style=3D'ms=
o-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Greg<o:p></o:p></p></div><=
/div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-botto=
m-alt:auto'>&nbsp;<o:p></o:p></p><div><p class=3DMsoNormal style=3D'mso-margin-t=
op-alt:auto;mso-margin-bottom-alt:auto'>On Mon, Jan 30, 2017 at 11:04 PM, Le=
s Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank=
">ginsberg@cisco.com</a>&gt; wrote:<o:p></o:p></p><div><div><p class=3DMsoNorm=
al style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'f=
ont-size:11.0pt;font-family:Calibri;color:#1F497D'>Greg &#8211;</span><o:p><=
/o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom=
-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>=
&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:aut=
o;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Cali=
bri;color:#1F497D'>Thanx for the quick turnaround.</span><o:p></o:p></p><p c=
lass=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><s=
pan style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span>=
<o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F=
497D'>Section 4.5 (revised text)</span><o:p></o:p></p><p class=3DMsoNormal sty=
le=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-si=
ze:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><=
span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp;=
 The capability to support RTM on a particular link (interface) is</span><o:=
p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bot=
tom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497=
D'>&nbsp;&nbsp; advertised in a new sub-TLV which may be included in TLVs ad=
vertising</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:=
auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:C=
alibri;color:#1F497D'>&nbsp;&nbsp; Intemediate System (IS) Reachability on a=
 specific link (TLVs 22, 23, 222, and 223).</span><o:p></o:p></p><p class=3DMs=
oNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span sty=
le=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></=
o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&=
nbsp;&nbsp; The format for the RTM Capabilities sub-TLV is presented in Figu=
re 5</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;=
mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibr=
i;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-m=
argin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt=
;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2</span><o:p></o:p></p>=
<p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto=
'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nb=
sp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...</spa=
n><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margi=
n-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#=
1F497D'>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+=
-+-+...</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Cal=
ibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Type&=
nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp; Length&nbsp;&nbsp;&nbsp; |=
 RTM |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; ...</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-famil=
y:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+...</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-=
margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0p=
t;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMs=
oNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span sty=
le=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp; Figure =
5: RTM Capability sub-TLV</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso=
-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0=
pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DM=
soNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span st=
yle=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&#8230; (Remainder =
unchanged)</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt=
:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:=
Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D=
'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:=
11.0pt;font-family:Calibri;color:#1F497D'>Section 7.5 (revised text)</span><=
o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-b=
ottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F4=
97D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-al=
t:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family=
:Calibri;color:#1F497D'>7.5.&nbsp; IS-IS RTM Capability sub-TLV </span><o:p>=
</o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-botto=
m-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'=
>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:au=
to;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Cal=
ibri;color:#1F497D'>&nbsp;&nbsp; IANA is requested to assign a new Type for =
RTM capability sub-TLV</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-ma=
rgin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;=
font-family:Calibri;color:#1F497D'>&nbsp;&nbsp; from the Sub-TLVs for TLVs 2=
2, 23, 141, 222, and 223 registry as</span><o:p></o:p></p><p class=3DMsoNormal=
 style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'fon=
t-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp; follows:</span=
><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin=
-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1=
F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-=
alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-fami=
ly:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; +------+-------------+----+----=
+-----+-----+-----+---------------+</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font=
-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; | Type | =
Description | 22 | 23 | 141 | 222 | 223 | Reference&nbsp;&nbsp;&nbsp;&nbsp; =
|</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso=
-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;c=
olor:#1F497D'>&nbsp;&nbsp;&nbsp; +------+-------------+----+----+-----+-----=
+-----+---------------+</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-m=
argin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt=
;font-family:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; | TBA3 |&nbsp;&nbsp;&=
nbsp;&nbsp; RTM &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;| y&nbsp; | y&nbsp; | n&nbsp;&=
nbsp; | y&nbsp;&nbsp; | y&nbsp;&nbsp; | This document |</span><o:p></o:p></p=
><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:aut=
o'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&n=
bsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | C=
apability |&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |</span><o:p></o:p></p=
><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:aut=
o'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;&n=
bsp;&nbsp; +------+-------------+----+----+-----+-----+-----+---------------=
+</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso=
-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;c=
olor:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-marg=
in-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;fo=
nt-family:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Table 5: IS-IS RTM Capability sub-TLV Registry=
 Description</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-famil=
y:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal styl=
e=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-siz=
e:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:p></o:p></p><p c=
lass=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><s=
pan style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanx.</span>=
<o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto'><span style=3D'font-size:11.0pt;font-family:Calibri;color:#1F=
497D'>&nbsp;</span><o:p></o:p></p><p class=3DMsoNormal style=3D'mso-margin-top-a=
lt:auto;mso-margin-bottom-alt:auto'><span style=3D'font-size:11.0pt;font-famil=
y:Calibri;color:#1F497D'>&nbsp;&nbsp;&nbsp; Les</span><o:p></o:p></p><p clas=
s=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span=
 style=3D'font-size:11.0pt;font-family:Calibri;color:#1F497D'>&nbsp;</span><o:=
p></o:p></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=3DMsoNormal style=3D'mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto'><b><span style=3D'font-size:10.0pt;font-family:Ta=
homa'>From:</span></b><span style=3D'font-size:10.0pt;font-family:Tahoma'> Gre=
g Mirsky [mailto:<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">greg=
imirsky@gmail.com</a>] <br><b>Sent:</b> Monday, January 30, 2017 10:36 PM<br=
><b>To:</b> Les Ginsberg (ginsberg)<br><b>Cc:</b> Loa Andersson; <a href=3D"ma=
ilto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>; TEAS WG; <a href=3D"mai=
lto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-wg; <a href=3D"mail=
to:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.org</a>; <a href=3D"=
mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"_blank">draft-=
ietf-mpls-residence-time@tools.ietf.org</a>; TEAS WG Chairs; <a href=3D"mailto=
:isis-chairs@ietf.org" target=3D"_blank">isis-chairs@ietf.org</a>; <a href=3D"ma=
ilto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.org</a><br><b>Su=
bject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-residence-t=
ime</span><o:p></o:p></p></div></div><div><div><p class=3DMsoNormal style=3D'mso=
-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p><div><=
p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'=
>Hi Les,<o:p></o:p></p><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:aut=
o;mso-margin-bottom-alt:auto'>attached are diff and the updated version -14.=
 Would be much obliged to hear from you if the updates are according to your=
 suggestions and address your comments.<o:p></o:p></p></div><div><p class=3DMs=
oNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:=
p></o:p></p></div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso=
-margin-bottom-alt:auto'>Kind regards,<o:p></o:p></p></div><div><p class=3DMso=
Normal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Greg<o:p><=
/o:p></p></div><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto'>&nbsp;<o:p></o:p></p></div></div><div><p class=3DMsoNorm=
al style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o=
:p></p><div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bot=
tom-alt:auto'>On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsberg) &lt;<=
a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt=
; wrote:<o:p></o:p></p><div><div><p class=3Dm-2344136845194405828m783208952278=
4764482m8733016173006011846m2337760234444598969msoplaintext>Loa -<o:p></o:p>=
</p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m2=
337760234444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-2344136845194=
405828m7832089522784764482m8733016173006011846m2337760234444598969msoplainte=
xt>The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to adv=
ertise RTM capability is a better solution than the previous proposal and th=
is has my support.<o:p></o:p></p><p class=3Dm-2344136845194405828m783208952278=
4764482m8733016173006011846m2337760234444598969msoplaintext>However, there a=
re some details as regards the proposed sub-TLV that should be revised.<o:p>=
</o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873301617300601=
1846m2337760234444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-2344136=
845194405828m7832089522784764482m8733016173006011846m2337760234444598969msop=
laintext>1)Rather than use a fixed 16 bit field for the flags I suggest you =
utilize the encoding style introduced in RFC 7794 (see Section 2.1) which al=
lows for a variable length flags field. This addresses two issues:<o:p></o:p=
></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m=
2337760234444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-234413684519=
4405828m7832089522784764482m8733016173006011846m2337760234444598969msoplaint=
ext>&nbsp;&nbsp; o You need never worry that the size of the flags field wil=
l be too small for future extensions<o:p></o:p></p><p class=3Dm-23441368451944=
05828m7832089522784764482m8733016173006011846m2337760234444598969msoplaintex=
t>&nbsp;&nbsp; o It minimizes the number of bytes required to be sent<o:p></=
o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330161730060118=
46m2337760234444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-234413684=
5194405828m7832089522784764482m8733016173006011846m2337760234444598969msopla=
intext>The latter point is something IS-IS has always been more conservative=
 about than OSPF because of the fixed size of an LSP set which can be advert=
ised by a single router.<o:p></o:p></p><p class=3Dm-2344136845194405828m783208=
9522784764482m8733016173006011846m2337760234444598969msoplaintext>&nbsp;<o:p=
></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330161730060=
11846m2337760234444598969msoplaintext>2)In the IANA considerations you have =
limited the sub-TLV to being used in TLV 22 only, but there is no reason to =
do so. This does not allow MT to be supported and it needlessly prevents use=
 of the sub-TLV by the RFC 5311 extensions (however unpopular those may be).=
 I can understand why the sub-TLV may not be useful in TLV 141, therefore I =
suggest the table in Section 7.5 be revised to be:<o:p></o:p></p><p class=3Dm-=
2344136845194405828m7832089522784764482m8733016173006011846m2337760234444598=
969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-2344136845194405828m78320895=
22784764482m8733016173006011846m2337760234444598969msoplaintext>&nbsp;<o:p><=
/o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011=
846m2337760234444598969msoplaintext>&nbsp;&nbsp;&nbsp; | Type | Description =
| 22 | 23 | 141 | 222 | 223 | Reference&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o=
:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873301617300601184=
6m2337760234444598969msoplaintext>&nbsp;&nbsp;&nbsp;+------+-------------+--=
--+----+-----+-----+-----+---------------+&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:=
p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846=
m2337760234444598969msoplaintext>&nbsp;&nbsp;| TBA3 |&nbsp;&nbsp;&nbsp; RTM&=
nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;| y&nbsp; | y&nbsp; | n&nbsp;&nbsp; | y&=
nbsp;&nbsp; | y&nbsp;&nbsp; | This document |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; <o:p></o:p></p><p class=3Dm-2344136845194405828m783208952278=
4764482m8733016173006011846m2337760234444598969msoplaintext>&nbsp;&nbsp;&nbs=
p; +------+-------------+----+----+-----+-----+-----+---------------+&nbsp;&=
nbsp;&nbsp;&nbsp; <o:p></o:p></p><p class=3Dm-2344136845194405828m783208952278=
4764482m8733016173006011846m2337760234444598969msoplaintext>&nbsp;<o:p></o:p=
></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m=
2337760234444598969msoplaintext>i.e. &quot;y&quot; for all but TLV 141 (in c=
ase the ASCII art doesn't translate well in your mailer).<o:p></o:p></p><p c=
lass=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m233776023=
4444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3DMsoNormal style=3D'mso-ma=
rgin-top-alt:auto;mso-margin-bottom-alt:auto'>You should also remove the ref=
erence to RFC 5305 in Section 4.5 as it is too limiting. Simply referencing =
the IANA registry <a href=3D"http://www.iana.org/assignments/isis-tlv-codepoin=
ts/isis-tlv-codepoints.xhtml%23isis-tlv-codepoints-22-23-141-222-223" target=
=3D"_blank">http://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codep=
oints.xhtml#isis-tlv-codepoints-22-23-141-222-223</a> should be sufficient. =
All necessary references can be found there.<o:p></o:p></p><p class=3Dm-234413=
6845194405828m7832089522784764482m8733016173006011846m2337760234444598969mso=
plaintext>&nbsp;<o:p></o:p></p><p class=3Dm-2344136845194405828m78320895227847=
64482m8733016173006011846m2337760234444598969msoplaintext>3)An editorial cor=
rection:<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87=
33016173006011846m2337760234444598969msoplaintext>&nbsp;<o:p></o:p></p><p cl=
ass=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m2337760234=
444598969msoplaintext>Introduction 3<sup>rd</sup> paragraph:<o:p></o:p></p><=
p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m233776=
0234444598969msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-234413684519440582=
8m7832089522784764482m8733016173006011846m2337760234444598969msoplaintext>s/=
 Althugh/ Although<o:p></o:p></p><p class=3Dm-2344136845194405828m783208952278=
4764482m8733016173006011846m2337760234444598969msoplaintext>&nbsp;<o:p></o:p=
></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m=
2337760234444598969msoplaintext>&nbsp;&nbsp; Les<o:p></o:p></p><p class=3Dm-23=
44136845194405828m7832089522784764482m8733016173006011846m233776023444459896=
9msoplaintext>&nbsp;<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522=
784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; -----Orig=
inal Message-----<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784=
764482m8733016173006011846m2337760234444598969msoplaintext>&gt; From: OSPF [=
mailto:<a href=3D"mailto:ospf-bounces@ietf.org" target=3D"_blank">ospf-bounces@i=
etf.org</a>] On Behalf Of Loa Andersson<o:p></o:p></p><p class=3Dm-23441368451=
94405828m7832089522784764482m8733016173006011846m2337760234444598969msoplain=
text>&gt; Sent: Monday, January 30, 2017 8:02 AM<o:p></o:p></p><p class=3Dm-23=
44136845194405828m7832089522784764482m8733016173006011846m233776023444459896=
9msoplaintext>&gt; To: <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@i=
etf.org</a>; TEAS WG; <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ie=
tf.org</a>; Isis-wg<o:p></o:p></p><p class=3Dm-2344136845194405828m78320895227=
84764482m8733016173006011846m2337760234444598969msoplaintext>&gt; Cc: <a hre=
f=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">isis-chairs@ietf.org</a>; <a=
 href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"_blank"=
>draft-ietf-mpls-residence-time@tools.ietf.org</a>; TEAS<o:p></o:p></p><p cl=
ass=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m2337760234=
444598969msoplaintext>&gt; WG Chairs; <a href=3D"mailto:mpls-chairs@ietf.org" =
target=3D"_blank">mpls-chairs@ietf.org</a>; <a href=3D"mailto:ospf-chairs@ietf.o=
rg" target=3D"_blank">ospf-chairs@ietf.org</a><o:p></o:p></p><p class=3Dm-234413=
6845194405828m7832089522784764482m8733016173006011846m2337760234444598969mso=
plaintext>&gt; Subject: [OSPF] Working group last call on draft-ietf-mpls-re=
sidence-time<o:p></o:p></p><div><div><p class=3Dm-2344136845194405828m78320895=
22784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; <o:p></=
o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330161730060118=
46m2337760234444598969msoplaintext>&gt; Working Groups,<o:p></o:p></p><p cla=
ss=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m23377602344=
44598969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7832=
089522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; Thi=
s is to initiate a two week working group last call in four working groups o=
n<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873301617=
3006011846m2337760234444598969msoplaintext>&gt; draft-ietf-mpls-residence-ti=
me-13.<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733=
016173006011846m2337760234444598969msoplaintext>&gt; <o:p></o:p></p><p class=
=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m2337760234444=
598969msoplaintext>&gt; The MPLS working group has done an earlier working g=
roup last call and a<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522=
784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; request f=
or publication has been made.<o:p></o:p></p><p class=3Dm-2344136845194405828m7=
832089522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; =
<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173=
006011846m2337760234444598969msoplaintext>&gt; The changes to the document w=
ere such that we decided to do a new<o:p></o:p></p><p class=3Dm-23441368451944=
05828m7832089522784764482m8733016173006011846m2337760234444598969msoplaintex=
t>&gt; working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.<=
o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330161730=
06011846m2337760234444598969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344=
136845194405828m7832089522784764482m8733016173006011846m2337760234444598969m=
soplaintext>&gt; There are three major changes between the version of the do=
cument for<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m=
8733016173006011846m2337760234444598969msoplaintext>&gt; which publication w=
as requested are:<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784=
764482m8733016173006011846m2337760234444598969msoplaintext>&gt; <o:p></o:p><=
/p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m23=
37760234444598969msoplaintext>&gt; (1) that section 7 &quot; One-step Clock =
and Two-step Clock Modes&quot; has been<o:p></o:p></p><p class=3Dm-23441368451=
94405828m7832089522784764482m8733016173006011846m2337760234444598969msoplain=
text>&gt; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;moved up to become section 2.1.<o:p>=
</o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873301617300601=
1846m2337760234444598969msoplaintext>&gt; (2) that a sub-TLV for TLV 22 inst=
ead of TLV 251 is used to RTM<o:p></o:p></p><p class=3Dm-2344136845194405828m7=
832089522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Capability when IS-IS used advertise RTM capab=
ilities<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873=
3016173006011846m2337760234444598969msoplaintext>&gt; (3) BGP-LS has been ad=
ded as a RTM capability advertisement method<o:p></o:p></p><p class=3Dm-234413=
6845194405828m7832089522784764482m8733016173006011846m2337760234444598969mso=
plaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m783208952278476=
4482m8733016173006011846m2337760234444598969msoplaintext>&gt; A side-by-side=
 diff between version -12 and -13 is available at:<o:p></o:p></p><p class=3Dm-=
2344136845194405828m7832089522784764482m8733016173006011846m2337760234444598=
969msoplaintext>&gt; <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-m=
pls-residence-time-13" target=3D"_blank"><span style=3D'color:windowtext;text-de=
coration:none'>https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residence-t=
ime-13</span></a><o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784=
764482m8733016173006011846m2337760234444598969msoplaintext>&gt; <o:p></o:p><=
/p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m23=
37760234444598969msoplaintext>&gt; Please send your comments to the mpls wg =
mailing list (<a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D'co=
lor:windowtext;text-decoration:none'>mpls@ietf.org</span></a>), if<o:p></o:p=
></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m=
2337760234444598969msoplaintext>&gt; you are not subscribed to the mpls wg l=
ist, send to &quot;your own&quot;<o:p></o:p></p><p class=3Dm-23441368451944058=
28m7832089522784764482m8733016173006011846m2337760234444598969msoplaintext>&=
gt; working group mailing list, and we'll make sure they are posted to the M=
PLS<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016=
173006011846m2337760234444598969msoplaintext>&gt; wg list.<o:p></o:p></p><p =
class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m23377602=
34444598969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7=
832089522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; =
There were one IPR disclosure against this document.<o:p></o:p></p><p class=3D=
m-2344136845194405828m7832089522784764482m8733016173006011846m23377602344445=
98969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7832089=
522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; All th=
e authors and contributors have stated on the working group mailing list<o:p=
></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330161730060=
11846m2337760234444598969msoplaintext>&gt; that they are not aware of any ot=
her IPRs that relates to this document.<o:p></o:p></p><p class=3Dm-23441368451=
94405828m7832089522784764482m8733016173006011846m2337760234444598969msoplain=
text>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m=
8733016173006011846m2337760234444598969msoplaintext>&gt; This working group =
last call ends February 13, 2017.<o:p></o:p></p><p class=3Dm-23441368451944058=
28m7832089522784764482m8733016173006011846m2337760234444598969msoplaintext>&=
gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m873301=
6173006011846m2337760234444598969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm=
-2344136845194405828m7832089522784764482m8733016173006011846m233776023444459=
8969msoplaintext>&gt; /Loa<o:p></o:p></p><p class=3Dm-2344136845194405828m7832=
089522784764482m8733016173006011846m2337760234444598969msoplaintext>&gt; MPL=
S wg co-chairs<o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764=
482m8733016173006011846m2337760234444598969msoplaintext>&gt; --<o:p></o:p></=
p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m233=
7760234444598969msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405=
828m7832089522784764482m8733016173006011846m2337760234444598969msoplaintext>=
&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m87330=
16173006011846m2337760234444598969msoplaintext>&gt; Loa Andersson&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; email: <a href=3D"mailto:l=
oa@mail01.huawei.com" target=3D"_blank"><span style=3D'color:windowtext;text-dec=
oration:none'>loa@mail01.huawei.com</span></a><o:p></o:p></p><p class=3Dm-2344=
136845194405828m7832089522784764482m8733016173006011846m2337760234444598969m=
soplaintext>&gt; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
><span style=3D'color:windowtext;text-decoration:none'>loa@pi.nu</span></a><o:=
p></o:p></p><p class=3Dm-2344136845194405828m7832089522784764482m8733016173006=
011846m2337760234444598969msoplaintext>&gt; Huawei Technologies (consultant)=
&nbsp;&nbsp;&nbsp;&nbsp; phone: +46 739 81 21 64<o:p></o:p></p><p class=3Dm-23=
44136845194405828m7832089522784764482m8733016173006011846m233776023444459896=
9msoplaintext>&gt; <o:p></o:p></p><p class=3Dm-2344136845194405828m78320895227=
84764482m8733016173006011846m2337760234444598969msoplaintext>&gt; __________=
_____________________________________<o:p></o:p></p></div></div><p class=3Dm-2=
344136845194405828m7832089522784764482m8733016173006011846m23377602344445989=
69msoplaintext>&gt; OSPF mailing list<o:p></o:p></p><p class=3Dm-2344136845194=
405828m7832089522784764482m8733016173006011846m2337760234444598969msoplainte=
xt>&gt; <a href=3D"mailto:OSPF@ietf.org" target=3D"_blank"><span style=3D'color:wi=
ndowtext;text-decoration:none'>OSPF@ietf.org</span></a><o:p></o:p></p><p cla=
ss=3Dm-2344136845194405828m7832089522784764482m8733016173006011846m23377602344=
44598969msoplaintext>&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/osp=
f" target=3D"_blank"><span style=3D'color:windowtext;text-decoration:none'>https=
://www.ietf.org/mailman/listinfo/ospf</span></a><o:p></o:p></p></div></div><=
p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>_=
______________________________________________<br>OSPF mailing list<br><a hr=
ef=3D"mailto:OSPF@ietf.org" target=3D"_blank">OSPF@ietf.org</a><br><a href=3D"http=
s://www.ietf.org/mailman/listinfo/ospf" target=3D"_blank">https://www.ietf.org=
/mailman/listinfo/ospf</a><o:p></o:p></p></div><p class=3DMsoNormal style=3D'mso=
-margin-top-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p></div>=
</div></div></div></div></div></div><p class=3DMsoNormal style=3D'mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p></div></div></div=
></div></div></div></div><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;m=
so-margin-bottom-alt:auto'>&nbsp;<o:p></o:p></p></div></div></div></div></di=
v></div></blockquote></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal>_______________________________________________ mpls mailing=
 list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls <o:p></o:p></=
p></div></body></html>

--B_3568790873_1226590373--



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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 1 Feb 2017 13:41:39 -0800
Message-ID: <CA+RyBmWVOX6epiZX2W79oh0F6gvBswOzPTUVX0WVdE7s3M9MsA@mail.gmail.com>
To: Uma Chunduri <uma.chunduri@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/gw7spdgAQWD0klpgtdAiyNktBe4>
Cc: "Les Ginsberg \(ginsberg\)" <ginsberg@cisco.com>, "isis-chairs@ietf.org" <isis-chairs@ietf.org>, Isis-wg <isis-wg-bounces@ietf.org>, "draft-ietf-mpls-residence-time@tools.ietf.org" <draft-ietf-mpls-residence-time@tools.ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, TEAS WG Chairs <teas-chairs@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, TEAS WG <teas@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
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Hi Uma,
you're absolutely correct. I'll work on to update section 4.5. Perhaps
moving up the reference to 4.3 in explanation of RTM Capability field might
be the easiest way.

Regards,
Greg

On Wed, Feb 1, 2017 at 9:34 AM, Uma Chunduri <uma.chunduri@huawei.com>
wrote:

> Dear Greg,
>
>
>
> Your changes look good to me.
>
>
>
> Nit:  Now, you would have noticed the text duplicated (couple of bullet
> points), which could have been avoided by just reference.
>
>
>
> Best Regards,
>
> --
>
> Uma C.
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Tuesday, January 31, 2017 7:19 PM
> *To:* Uma Chunduri <uma.chunduri@huawei.com>
> *Cc:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>; mpls@ietf.org;
> isis-chairs@ietf.org; Isis-wg <isis-wg-bounces@ietf.org>;
> draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs <
> teas-chairs@ietf.org>; mpls-chairs@ietf.org; TEAS WG <teas@ietf.org>;
> ospf@ietf.org; ospf-chairs@ietf.org
>
> *Subject:* Re: [mpls] [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Uma, Acee, Les, et. al,
>
> attached please find diff and the updated version. I think I've got it
> right by now.
>
> Greatly appreciate your comments.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri <uma.chunduri@huawei.com>
> wrote:
>
> Had a quick look at this diff.
>
>
>
> This is about unifying the encoding parts in IGP to have a consistent vie=
w
> for BGP-LS encoding or keeping these separate and yet having a correct
> representation in BGP-LS for both IGPs.
>
>
>
> =3D=3D
>
> With variable length bit field for Section 4.5 and fixed 4 byte value (as
> indicated as MUST  for length) in section 4.3  - I saw a discrepancy  in
> section 4.6 (BGP-LS) which is referencing section 4.3.
>
>
>
> You have multiple options to fix this:
>
>
>
> 1.       Change section 4.3 to match section 4.5 (I am not sure why we
> have to have variable length for this bit field to start with in this cas=
e
> like rfc 7794=E2=80=A6but I won=E2=80=99t say much now)
>
> 2.       Change Section 4.6 to represent differences in encoding section
> 4.5 and 4.3 correctly.
>
> =E2=80=9CLength, RTM, and Reserved fields as defined in Section 4.3.=E2=
=80=9D
>
>    3. Lastly unify section 4.5 to 4.3  i.e., 4 byte value with 3 bits
> defined and 29 bits reserved.
>
> --
>
> Uma C.
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org] *On Behalf Of *Les Ginsberg
> (ginsberg)
> *Sent:* Tuesday, January 31, 2017 8:22 AM
> *To:* Greg Mirsky <gregimirsky@gmail.com>
> *Cc:* mpls@ietf.org; isis-chairs@ietf.org; Isis-wg <
> isis-wg-bounces@ietf.org>; draft-ietf-mpls-residence-time@tools.ietf.org;
> TEAS WG Chairs <teas-chairs@ietf.org>; mpls-chairs@ietf.org; TEAS WG <
> teas@ietf.org>; ospf@ietf.org; ospf-chairs@ietf.org
> *Subject:* Re: [mpls] [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Greg =E2=80=93
>
>
>
> Looks good.
>
>
>
>    Les
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>=
]
>
> *Sent:* Tuesday, January 31, 2017 8:06 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> thank you for your patience and apologies for missing it.
>
> Diff and the update been attached.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Tue, Jan 31, 2017 at 5:07 AM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Greg =E2=80=93
>
>
>
> Almost=E2=80=A6
>
>
>
> Please change the title of Section 7.5 to =E2=80=9CIS-IS RTM Capability s=
ub-TLV=E2=80=9D.
>
>
>
> Please change the title of Table 5 to =E2=80=9CIS-IS RTM Capability sub-T=
LV
> Registry Description=E2=80=9D.
>
>
>
> The common point being since this is not exclusively for TLV 22 we do not
> want to say =E2=80=9Cfor TLV 22=E2=80=9D.
>
> Thanx.
>
>
>
>     Les
>
>
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Monday, January 30, 2017 11:43 PM
>
>
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> many thanks for your the most detailed suggestions. Hope I've it right.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Mon, Jan 30, 2017 at 11:04 PM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Greg =E2=80=93
>
>
>
> Thanx for the quick turnaround.
>
>
>
> Section 4.5 (revised text)
>
>
>
>    The capability to support RTM on a particular link (interface) is
>
>    advertised in a new sub-TLV which may be included in TLVs advertising
>
>    Intemediate System (IS) Reachability on a specific link (TLVs 22, 23,
> 222, and 223).
>
>
>
>    The format for the RTM Capabilities sub-TLV is presented in Figure 5
>
>
>
>      0                   1                   2
>
>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...
>
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
>
>     |      Type     |     Length    | RTM |              ...
>
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
>
>
>
>    Figure 5: RTM Capability sub-TLV
>
>
>
> =E2=80=A6 (Remainder unchanged)
>
>
>
> Section 7.5 (revised text)
>
>
>
> 7.5.  IS-IS RTM Capability sub-TLV
>
>
>
>    IANA is requested to assign a new Type for RTM capability sub-TLV
>
>    from the Sub-TLVs for TLVs 22, 23, 141, 222, and 223 registry as
>
>    follows:
>
>
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>     | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference     |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>     | TBA3 |     RTM      | y  | y  | n   | y   | y   | This document |
>
>     |           | Capability |      |     |      |       |
> |                                |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>
>
>              Table 5: IS-IS RTM Capability sub-TLV Registry Description
>
>
>
>
>
> Thanx.
>
>
>
>     Les
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Monday, January 30, 2017 10:36 PM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> attached are diff and the updated version -14. Would be much obliged to
> hear from you if the updates are according to your suggestions and addres=
s
> your comments.
>
>
>
> Kind regards,
>
> Greg
>
>
>
>
>
> On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Loa -
>
>
>
> The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to
> advertise RTM capability is a better solution than the previous proposal
> and this has my support.
>
> However, there are some details as regards the proposed sub-TLV that
> should be revised.
>
>
>
> 1)Rather than use a fixed 16 bit field for the flags I suggest you utiliz=
e
> the encoding style introduced in RFC 7794 (see Section 2.1) which allows
> for a variable length flags field. This addresses two issues:
>
>
>
>    o You need never worry that the size of the flags field will be too
> small for future extensions
>
>    o It minimizes the number of bytes required to be sent
>
>
>
> The latter point is something IS-IS has always been more conservative
> about than OSPF because of the fixed size of an LSP set which can be
> advertised by a single router.
>
>
>
> 2)In the IANA considerations you have limited the sub-TLV to being used i=
n
> TLV 22 only, but there is no reason to do so. This does not allow MT to b=
e
> supported and it needlessly prevents use of the sub-TLV by the RFC 5311
> extensions (however unpopular those may be). I can understand why the
> sub-TLV may not be useful in TLV 141, therefore I suggest the table in
> Section 7.5 be revised to be:
>
>
>
>
>
>     | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference
> |
>
>    +------+-------------+----+----+-----+-----+-----+---------------+
>
>   | TBA3 |    RTM       | y  | y  | n   | y   | y   | This document
> |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>
>
>
> i.e. "y" for all but TLV 141 (in case the ASCII art doesn't translate wel=
l
> in your mailer).
>
>
>
> You should also remove the reference to RFC 5305 in Section 4.5 as it is
> too limiting. Simply referencing the IANA registry http://www.iana.org/
> assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-
> codepoints-22-23-141-222-223 should be sufficient. All necessary
> references can be found there.
>
>
>
> 3)An editorial correction:
>
>
>
> Introduction 3rd paragraph:
>
>
>
> s/ Althugh/ Although
>
>
>
>    Les
>
>
>
> > -----Original Message-----
>
> > From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Loa Andersson
>
> > Sent: Monday, January 30, 2017 8:02 AM
>
> > To: mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg
>
> > Cc: isis-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org=
;
> TEAS
>
> > WG Chairs; mpls-chairs@ietf.org; ospf-chairs@ietf.org
>
> > Subject: [OSPF] Working group last call on draft-ietf-mpls-residence-ti=
me
>
> >
>
> > Working Groups,
>
> >
>
> > This is to initiate a two week working group last call in four working
> groups on
>
> > draft-ietf-mpls-residence-time-13.
>
> >
>
> > The MPLS working group has done an earlier working group last call and =
a
>
> > request for publication has been made.
>
> >
>
> > The changes to the document were such that we decided to do a new
>
> > working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.
>
> >
>
> > There are three major changes between the version of the document for
>
> > which publication was requested are:
>
> >
>
> > (1) that section 7 " One-step Clock and Two-step Clock Modes" has been
>
> >      moved up to become section 2.1.
>
> > (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM
>
> >      Capability when IS-IS used advertise RTM capabilities
>
> > (3) BGP-LS has been added as a RTM capability advertisement method
>
> >
>
> > A side-by-side diff between version -12 and -13 is available at:
>
> > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residence-time-13
>
> >
>
> > Please send your comments to the mpls wg mailing list (mpls@ietf.org),
> if
>
> > you are not subscribed to the mpls wg list, send to "your own"
>
> > working group mailing list, and we'll make sure they are posted to the
> MPLS
>
> > wg list.
>
> >
>
> > There were one IPR disclosure against this document.
>
> >
>
> > All the authors and contributors have stated on the working group
> mailing list
>
> > that they are not aware of any other IPRs that relates to this document=
.
>
> >
>
> > This working group last call ends February 13, 2017.
>
> >
>
> >
>
> > /Loa
>
> > MPLS wg co-chairs
>
> > --
>
> >
>
> >
>
> > Loa Andersson                        email: loa@mail01.huawei.com
>
> > Senior MPLS Expert                          loa@pi.nu
>
> > Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> >
>
> > _______________________________________________
>
> > OSPF mailing list
>
> > OSPF@ietf.org
>
> > https://www.ietf.org/mailman/listinfo/ospf
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>
>
>
>
>
>
>
>
>

--001a113cd4aef529ea05477ee9a3
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Uma,<div>you&#39;re absolutely correct. I&#39;ll work o=
n to update section 4.5. Perhaps moving up the reference to 4.3 in explanat=
ion of RTM Capability field might be the easiest way.</div><div><br></div><=
div>Regards,</div><div>Greg</div></div><div class=3D"gmail_extra"><br><div =
class=3D"gmail_quote">On Wed, Feb 1, 2017 at 9:34 AM, Uma Chunduri <span di=
r=3D"ltr">&lt;<a href=3D"mailto:uma.chunduri@huawei.com" target=3D"_blank">=
uma.chunduri@huawei.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_-1614837459830988739WordSection1">
<p class=3D"MsoNormal"><a name=3D"m_-1614837459830988739__MailEndCompose"><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:#1f497d">Dear Greg,<u></u><u></u></span></a></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">Your changes look good to me.<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">Nit: =C2=A0Now, you would have notice=
d the text duplicated (couple of bullet points), which could have been avoi=
ded by just reference.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Br=
ush Script MT&quot;;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Brush Script MT&quo=
t;;color:#0070c0">Best Regards,<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">--</span><span style=3D"font-size:11.=
0pt;font-family:&quot;Freestyle Script&quot;;color:#1f497d"><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">Uma C.</span><span style=3D"font-size=
:11.0pt;font-family:&quot;Brush Script MT&quot;;color:#1f497d"><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"><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"> Greg Mirsky [mailto:<a href=3D=
"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br><span class=3D"">
<b>Sent:</b> Tuesday, January 31, 2017 7:19 PM<br>
</span><b>To:</b> Uma Chunduri &lt;<a href=3D"mailto:uma.chunduri@huawei.co=
m" target=3D"_blank">uma.chunduri@huawei.com</a>&gt;<br>
<b>Cc:</b> Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com=
" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=3D"mailto:mpls@ietf=
.org" target=3D"_blank">mpls@ietf.org</a>; <a href=3D"mailto:isis-chairs@ie=
tf.org" target=3D"_blank">isis-chairs@ietf.org</a>; Isis-wg &lt;<a href=3D"=
mailto:isis-wg-bounces@ietf.org" target=3D"_blank">isis-wg-bounces@ietf.org=
</a>&gt;; <a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" =
target=3D"_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; T=
EAS WG Chairs &lt;<a href=3D"mailto:teas-chairs@ietf.org" target=3D"_blank"=
>teas-chairs@ietf.org</a>&gt;; <a href=3D"mailto:mpls-chairs@ietf.org" targ=
et=3D"_blank">mpls-chairs@ietf.org</a>; TEAS WG &lt;<a href=3D"mailto:teas@=
ietf.org" target=3D"_blank">teas@ietf.org</a>&gt;;
 <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; <a h=
ref=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.org<=
/a></span></p><div><div class=3D"h5"><br>
<b>Subject:</b> Re: [mpls] [OSPF] Working group last call on draft-ietf-mpl=
s-residence-time<u></u><u></u></div></div><p></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi Uma, Acee, Les, et. al,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">attached please find diff and the updated version. I=
 think I&#39;ve got it right by now.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greatly appreciate your comments.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri &lt;<=
a href=3D"mailto:uma.chunduri@huawei.com" target=3D"_blank">uma.chunduri@hu=
awei.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><a name=3D"m_-1614837459830988739_m_-234413684519440=
5828__MailEndCompose"><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif;color:#1f497d">Had a quick look at this diff.</span><=
/a><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">This is about unifying the encoding p=
arts in IGP to have a consistent view for BGP-LS encoding or keeping
 these separate and yet having a correct representation in BGP-LS for both =
IGPs.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=3D=3D</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">With variable length bit field for Se=
ction 4.5 and fixed 4 byte value (as indicated as MUST =C2=A0for length)
 in section 4.3 =C2=A0- I saw a discrepancy =C2=A0in section 4.6 (BGP-LS) w=
hich is referencing section 4.3.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">You have multiple options to fix this=
:</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828msolistparagraph"><s=
pan style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;co=
lor:#1f497d">1.</span><span style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif;color:#1f497d">Change section 4.3 to match section 4.5 (I am not sur=
e why we have to have variable length for this bit field to start with in t=
his case like rfc 7794=E2=80=A6but I won=E2=80=99t say much
 now)</span><u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828msolistparagraph"><s=
pan style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;co=
lor:#1f497d">2.</span><span style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif;color:#1f497d">Change Section 4.6 to represent differences in encodi=
ng section 4.5 and 4.3 correctly.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;text-indent:.5in;text-auto=
space:none">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;=
color:#1f497d">=E2=80=9C</span><span style=3D"font-size:10.0pt;font-family:=
&quot;Lucida Console&quot;">Length, RTM, and Reserved fields as defined in =
Section 4.3.=E2=80=9D</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">
<span style=3D"font-size:10.0pt;font-family:&quot;Lucida Console&quot;">=C2=
=A0=C2=A0 3. </span><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#1f497d">Lastly unify section 4.5 to 4.3 =C2=A0i.=
e., 4 byte value with 3 bits defined and 29 bits reserved.</span><u></u><u>=
</u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">--</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Uma C.</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<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-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"> mpls [mailto:<a href=3D"mailto=
:mpls-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, January 31, 2017 8:22 AM<br>
<b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a>; <a href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; Isis-wg &lt;<a href=3D"mailto:isis-wg-bounces@iet=
f.org" target=3D"_blank">isis-wg-bounces@ietf.org</a>&gt;;
<a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Cha=
irs &lt;<a href=3D"mailto:teas-chairs@ietf.org" target=3D"_blank">teas-chai=
rs@ietf.org</a>&gt;;
<a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.=
org</a>; TEAS WG &lt;<a href=3D"mailto:teas@ietf.org" target=3D"_blank">tea=
s@ietf.org</a>&gt;;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; <a hr=
ef=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] [OSPF] Working group last call on draft-ietf-mpl=
s-residence-time</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Looks good.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Les</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [<a href=3D"mailto:g=
regimirsky@gmail.com" target=3D"_blank">mailto:gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Tuesday, January 31, 2017 8:06 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time</span><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for your patience and apologies for missin=
g it.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Diff and the update been attached.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Tue, Jan 31, 2017 at 5:07 AM, Les Ginsberg (ginsb=
erg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Almost=E2=80=A6</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Please change the title of Section 7.=
5 to =E2=80=9CIS-IS RTM Capability sub-TLV=E2=80=9D.</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Please change the title of Table 5 to=
 =E2=80=9CIS-IS RTM Capability sub-TLV Registry Description=E2=80=9D.</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">The common point being since this is =
not exclusively for TLV 22 we do not want to say =E2=80=9Cfor TLV 22=E2=80=
=9D.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 Les</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [mailto:<a href=3D"m=
ailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Monday, January 30, 2017 11:43 PM</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time<u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">many thanks for your the most detailed suggestions. =
Hope I&#39;ve it right.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Mon, Jan 30, 2017 at 11:04 PM, Les Ginsberg (gins=
berg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@=
cisco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx for the quick turnaround.</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Section 4.5 (revised text)</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 The capability to suppor=
t RTM on a particular link (interface) is</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 advertised in a new sub-=
TLV which may be included in TLVs advertising</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Intemediate System (IS) =
Reachability on a specific link (TLVs 22, 23, 222, and 223).</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 The format for the RTM C=
apabilities sub-TLV is presented in Figure 5</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0 0=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 1=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 2</span><u></u=
><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0 0 1 2 3 4 5 =
6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-<wbr>+-+-+-+-+-+-+-+-+-+-+-+...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Type=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 Leng=
th=C2=A0=C2=A0=C2=A0 | RTM |=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 ...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-<wbr>+-+-+-+-+-+-+-+-+-+-+-+...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Figure 5: RTM Capability=
 sub-TLV</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=E2=80=A6 (Remainder unchanged)</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Section 7.5 (revised text)</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">7.5.=C2=A0 IS-IS RTM Capability sub-T=
LV
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 IANA is requested to ass=
ign a new Type for RTM capability sub-TLV</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 from the Sub-TLVs for TL=
Vs 22, 23, 141, 222, and 223 registry as</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 follows:</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 | Type | Descripti=
on | 22 | 23 | 141 | 222 | 223 | Reference=C2=A0=C2=A0=C2=A0=C2=A0 |</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 | TBA3 |=C2=A0=C2=
=A0=C2=A0=C2=A0 RTM =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0| y=C2=A0 | y=C2=A0 | n=
=C2=A0=C2=A0 | y=C2=A0=C2=A0 | y=C2=A0=C2=A0 | This document |</span><u></u=
><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=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 | Capability |=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=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=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 |</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Table 5: IS-IS RTM Capability sub-TLV =
Registry Description</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 Les</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [mailto:<a href=3D"m=
ailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Monday, January 30, 2017 10:36 PM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">attached are diff and the updated version -14. Would=
 be much obliged to hear from you if the updates are according to your sugg=
estions and address your comments.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Kind regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<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>
<p class=3D"MsoNormal">On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsb=
erg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
Loa -<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to adver=
tise RTM capability is a better solution than the previous proposal and thi=
s has my support.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
However, there are some details as regards the proposed sub-TLV that should=
 be revised.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
1)Rather than use a fixed 16 bit field for the flags I suggest you utilize =
the encoding style introduced in RFC 7794 (see Section 2.1) which allows fo=
r a variable length flags field. This addresses two issues:<u></u><u></u></=
p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 o You need never worry that the size of the flags field will b=
e too small for future extensions<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 o It minimizes the number of bytes required to be sent<u></u><=
u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
The latter point is something IS-IS has always been more conservative about=
 than OSPF because of the fixed size of an LSP set which can be advertised =
by a single router.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
2)In the IANA considerations you have limited the sub-TLV to being used in =
TLV 22 only, but there is no reason to do so. This does not allow MT to be =
supported and it needlessly prevents use of the sub-TLV by the RFC 5311 ext=
ensions (however unpopular those
 may be). I can understand why the sub-TLV may not be useful in TLV 141, th=
erefore I suggest the table in Section 7.5 be revised to be:<u></u><u></u><=
/p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0 | Type | Description | 22 | 23 | 141 | 222 | 223 | Refer=
ence=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
<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0+------+-------------+----+<wbr>----+-----+-----+-----+--=
-----<wbr>--------+=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0| TBA3 |=C2=A0=C2=A0=C2=A0 RTM=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=
=C2=A0| y=C2=A0 | y=C2=A0 | n=C2=A0=C2=A0 | y=C2=A0=C2=A0 | y=C2=A0=C2=A0 |=
 This document |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <u></u>
<u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0 +------+-------------+----+---<wbr>-+-----+-----+-----+-=
---------<wbr>-----+=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
i.e. &quot;y&quot; for all but TLV 141 (in case the ASCII art doesn&#39;t t=
ranslate well in your mailer).<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">You should also remove the reference to RFC 5305 in =
Section 4.5 as it is too limiting. Simply referencing the IANA registry
<a href=3D"http://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-cod=
epoints.xhtml%23isis-tlv-codepoints-22-23-141-222-223" target=3D"_blank">
http://www.iana.org/<wbr>assignments/isis-tlv-<wbr>codepoints/isis-tlv-<wbr=
>codepoints.xhtml#isis-tlv-<wbr>codepoints-22-23-141-222-223</a> should be =
sufficient. All necessary references can be found there.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
3)An editorial correction:<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
Introduction 3<sup>rd</sup> paragraph:<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
s/ Althugh/ Although<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 Les<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; -----Original Message-----<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; From: OSPF [mailto:<a href=3D"mailto:ospf-bounces@ietf.org" target=3D"=
_blank">ospf-bounces@ietf.org</a>] On Behalf Of Loa Andersson<u></u><u></u>=
</p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Sent: Monday, January 30, 2017 8:02 AM<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; To: <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</=
a>; TEAS WG; <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">
ospf@ietf.org</a>; Isis-wg<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Cc: <a href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">isis-cha=
irs@ietf.org</a>;
<a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS<u></u>=
<u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; WG Chairs; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">m=
pls-chairs@ietf.org</a>;
<a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.=
org</a><u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Subject: [OSPF] Working group last call on draft-ietf-mpls-residence-t=
ime<u></u><u></u></p>
<div>
<div>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Working Groups,<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; This is to initiate a two week working group last call in four working=
 groups on<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; draft-ietf-mpls-residence-<wbr>time-13.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; The MPLS working group has done an earlier working group last call and=
 a<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; request for publication has been made.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; The changes to the document were such that we decided to do a new<u></=
u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.<u=
></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; There are three major changes between the version of the document for<=
u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; which publication was requested are:<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (1) that section 7 &quot; One-step Clock and Two-step Clock Modes&quot=
; has been<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0moved up to become section 2.1.<u></u><u=
></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM<u></u>=
<u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Capability when IS-IS used advertise RTM=
 capabilities<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (3) BGP-LS has been added as a RTM capability advertisement method<u><=
/u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; A side-by-side diff between version -12 and -13 is available at:<u></u=
><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residen=
ce-time-13" target=3D"_blank">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
rfcdiff?<wbr>url2=3Ddraft-ietf-mpls-<wbr>residence-time-13</span></a><u></u=
><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank"><span style=3D"color:windowtext;text-de=
coration:none">mpls@ietf.org</span></a>), if<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; you are not subscribed to the mpls wg list, send to &quot;your own&quo=
t;<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; working group mailing list, and we&#39;ll make sure they are posted to=
 the MPLS<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; wg list.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; There were one IPR disclosure against this document.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; All the authors and contributors have stated on the working group mail=
ing list<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; that they are not aware of any other IPRs that relates to this documen=
t.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; This working group last call ends February 13, 2017.<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; /Loa<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; MPLS wg co-chairs<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; --<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; 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 email: <a href=3D"mailto:loa@mail01.huawei.com" target=3D"_bla=
nk">
<span style=3D"color:windowtext;text-decoration:none">loa@mail01.huawei.com=
</span></a><u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Senior MPLS Expert=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=
=C2=A0=C2=A0=C2=A0<wbr>=C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_blank=
">
<span style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><=
u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Huawei Technologies (consultant)=C2=A0=C2=A0=C2=A0=C2=A0 phone: +46 73=
9 81 21 64<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; ______________________________<wbr>_________________<u></u><u></u></p>
</div>
</div>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; OSPF mailing list<u></u><u></u></p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"mailto:OSPF@ietf.org" target=3D"_blank"><span style=3D"colo=
r:windowtext;text-decoration:none">OSPF@ietf.org</span></a><u></u><u></u></=
p>
<p class=3D"m_-1614837459830988739m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ospf" target=3D"_blan=
k"><span style=3D"color:windowtext;text-decoration:none">https://www.ietf.o=
rg/mailman/<wbr>listinfo/ospf</span></a><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
______________________________<wbr>_________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org" target=3D"_blank">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" target=3D"_blank">ht=
tps://www.ietf.org/mailman/<wbr>listinfo/ospf</a><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>

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

--001a113cd4aef529ea05477ee9a3--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 1 Feb 2017 14:47:52 -0800
Message-ID: <CA+RyBmVD0Z-fPsUc1WJ8Vg_4f6BoxssfQ992344Eu2nypxpLgw@mail.gmail.com>
To: Uma Chunduri <uma.chunduri@huawei.com>
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Cc: "Les Ginsberg \(ginsberg\)" <ginsberg@cisco.com>, "isis-chairs@ietf.org" <isis-chairs@ietf.org>, Isis-wg <isis-wg-bounces@ietf.org>, "draft-ietf-mpls-residence-time@tools.ietf.org" <draft-ietf-mpls-residence-time@tools.ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, TEAS WG Chairs <teas-chairs@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, TEAS WG <teas@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
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--001a113ce9bcbee92905477fd6da
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Hi Uma,
below is the update to address your suggestion:
OLD TEXT

   o  Length value equals number of octets of the Value field.

   o  Value contains variable number of bit-map fields so that overall
      number of bits in the fields equals Length * 8.

   o  Bits are defined/sent starting with Bit 0.  Additional bit-map
      field definitions that may be defined in the future SHOULD be
      assigned in ascending bit order so as to minimize the number of
      bits that will need to be transmitted.

   o  Undefined bits MUST be transmitted as 0 and MUST be ignored on
      receipt.

   o  Bits that are NOT transmitted MUST be treated as if they are set
      to 0 on receipt.

NEW TEXT

   o  Definitions, rules of handling, and values for fields Length and
      Value are as defined in Section 4.3

-----

I think that text regarding RTM Capability field can stay even though,
effectively, it duplicates the definition of the field and points to
4.3.

What do you think?


Regards,

Greg


On Wed, Feb 1, 2017 at 9:34 AM, Uma Chunduri <uma.chunduri@huawei.com>
wrote:

> Dear Greg,
>
>
>
> Your changes look good to me.
>
>
>
> Nit:  Now, you would have noticed the text duplicated (couple of bullet
> points), which could have been avoided by just reference.
>
>
>
> Best Regards,
>
> --
>
> Uma C.
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Tuesday, January 31, 2017 7:19 PM
> *To:* Uma Chunduri <uma.chunduri@huawei.com>
> *Cc:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>; mpls@ietf.org;
> isis-chairs@ietf.org; Isis-wg <isis-wg-bounces@ietf.org>;
> draft-ietf-mpls-residence-time@tools.ietf.org; TEAS WG Chairs <
> teas-chairs@ietf.org>; mpls-chairs@ietf.org; TEAS WG <teas@ietf.org>;
> ospf@ietf.org; ospf-chairs@ietf.org
>
> *Subject:* Re: [mpls] [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Uma, Acee, Les, et. al,
>
> attached please find diff and the updated version. I think I've got it
> right by now.
>
> Greatly appreciate your comments.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri <uma.chunduri@huawei.com>
> wrote:
>
> Had a quick look at this diff.
>
>
>
> This is about unifying the encoding parts in IGP to have a consistent vie=
w
> for BGP-LS encoding or keeping these separate and yet having a correct
> representation in BGP-LS for both IGPs.
>
>
>
> =3D=3D
>
> With variable length bit field for Section 4.5 and fixed 4 byte value (as
> indicated as MUST  for length) in section 4.3  - I saw a discrepancy  in
> section 4.6 (BGP-LS) which is referencing section 4.3.
>
>
>
> You have multiple options to fix this:
>
>
>
> 1.       Change section 4.3 to match section 4.5 (I am not sure why we
> have to have variable length for this bit field to start with in this cas=
e
> like rfc 7794=E2=80=A6but I won=E2=80=99t say much now)
>
> 2.       Change Section 4.6 to represent differences in encoding section
> 4.5 and 4.3 correctly.
>
> =E2=80=9CLength, RTM, and Reserved fields as defined in Section 4.3.=E2=
=80=9D
>
>    3. Lastly unify section 4.5 to 4.3  i.e., 4 byte value with 3 bits
> defined and 29 bits reserved.
>
> --
>
> Uma C.
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org] *On Behalf Of *Les Ginsberg
> (ginsberg)
> *Sent:* Tuesday, January 31, 2017 8:22 AM
> *To:* Greg Mirsky <gregimirsky@gmail.com>
> *Cc:* mpls@ietf.org; isis-chairs@ietf.org; Isis-wg <
> isis-wg-bounces@ietf.org>; draft-ietf-mpls-residence-time@tools.ietf.org;
> TEAS WG Chairs <teas-chairs@ietf.org>; mpls-chairs@ietf.org; TEAS WG <
> teas@ietf.org>; ospf@ietf.org; ospf-chairs@ietf.org
> *Subject:* Re: [mpls] [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Greg =E2=80=93
>
>
>
> Looks good.
>
>
>
>    Les
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com <gregimirsky@gmail.com>=
]
>
> *Sent:* Tuesday, January 31, 2017 8:06 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> thank you for your patience and apologies for missing it.
>
> Diff and the update been attached.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Tue, Jan 31, 2017 at 5:07 AM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Greg =E2=80=93
>
>
>
> Almost=E2=80=A6
>
>
>
> Please change the title of Section 7.5 to =E2=80=9CIS-IS RTM Capability s=
ub-TLV=E2=80=9D.
>
>
>
> Please change the title of Table 5 to =E2=80=9CIS-IS RTM Capability sub-T=
LV
> Registry Description=E2=80=9D.
>
>
>
> The common point being since this is not exclusively for TLV 22 we do not
> want to say =E2=80=9Cfor TLV 22=E2=80=9D.
>
> Thanx.
>
>
>
>     Les
>
>
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Monday, January 30, 2017 11:43 PM
>
>
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> many thanks for your the most detailed suggestions. Hope I've it right.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Mon, Jan 30, 2017 at 11:04 PM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Greg =E2=80=93
>
>
>
> Thanx for the quick turnaround.
>
>
>
> Section 4.5 (revised text)
>
>
>
>    The capability to support RTM on a particular link (interface) is
>
>    advertised in a new sub-TLV which may be included in TLVs advertising
>
>    Intemediate System (IS) Reachability on a specific link (TLVs 22, 23,
> 222, and 223).
>
>
>
>    The format for the RTM Capabilities sub-TLV is presented in Figure 5
>
>
>
>      0                   1                   2
>
>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...
>
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
>
>     |      Type     |     Length    | RTM |              ...
>
>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+...
>
>
>
>    Figure 5: RTM Capability sub-TLV
>
>
>
> =E2=80=A6 (Remainder unchanged)
>
>
>
> Section 7.5 (revised text)
>
>
>
> 7.5.  IS-IS RTM Capability sub-TLV
>
>
>
>    IANA is requested to assign a new Type for RTM capability sub-TLV
>
>    from the Sub-TLVs for TLVs 22, 23, 141, 222, and 223 registry as
>
>    follows:
>
>
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>     | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference     |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>     | TBA3 |     RTM      | y  | y  | n   | y   | y   | This document |
>
>     |           | Capability |      |     |      |       |
> |                                |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>
>
>              Table 5: IS-IS RTM Capability sub-TLV Registry Description
>
>
>
>
>
> Thanx.
>
>
>
>     Les
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Monday, January 30, 2017 10:36 PM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* Loa Andersson; mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg;
> ospf-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org; TEAS
> WG Chairs; isis-chairs@ietf.org; mpls-chairs@ietf.org
> *Subject:* Re: [OSPF] Working group last call on
> draft-ietf-mpls-residence-time
>
>
>
> Hi Les,
>
> attached are diff and the updated version -14. Would be much obliged to
> hear from you if the updates are according to your suggestions and addres=
s
> your comments.
>
>
>
> Kind regards,
>
> Greg
>
>
>
>
>
> On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Loa -
>
>
>
> The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to
> advertise RTM capability is a better solution than the previous proposal
> and this has my support.
>
> However, there are some details as regards the proposed sub-TLV that
> should be revised.
>
>
>
> 1)Rather than use a fixed 16 bit field for the flags I suggest you utiliz=
e
> the encoding style introduced in RFC 7794 (see Section 2.1) which allows
> for a variable length flags field. This addresses two issues:
>
>
>
>    o You need never worry that the size of the flags field will be too
> small for future extensions
>
>    o It minimizes the number of bytes required to be sent
>
>
>
> The latter point is something IS-IS has always been more conservative
> about than OSPF because of the fixed size of an LSP set which can be
> advertised by a single router.
>
>
>
> 2)In the IANA considerations you have limited the sub-TLV to being used i=
n
> TLV 22 only, but there is no reason to do so. This does not allow MT to b=
e
> supported and it needlessly prevents use of the sub-TLV by the RFC 5311
> extensions (however unpopular those may be). I can understand why the
> sub-TLV may not be useful in TLV 141, therefore I suggest the table in
> Section 7.5 be revised to be:
>
>
>
>
>
>     | Type | Description | 22 | 23 | 141 | 222 | 223 | Reference
> |
>
>    +------+-------------+----+----+-----+-----+-----+---------------+
>
>   | TBA3 |    RTM       | y  | y  | n   | y   | y   | This document
> |
>
>     +------+-------------+----+----+-----+-----+-----+---------------+
>
>
>
>
> i.e. "y" for all but TLV 141 (in case the ASCII art doesn't translate wel=
l
> in your mailer).
>
>
>
> You should also remove the reference to RFC 5305 in Section 4.5 as it is
> too limiting. Simply referencing the IANA registry http://www.iana.org/
> assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-
> codepoints-22-23-141-222-223 should be sufficient. All necessary
> references can be found there.
>
>
>
> 3)An editorial correction:
>
>
>
> Introduction 3rd paragraph:
>
>
>
> s/ Althugh/ Although
>
>
>
>    Les
>
>
>
> > -----Original Message-----
>
> > From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Loa Andersson
>
> > Sent: Monday, January 30, 2017 8:02 AM
>
> > To: mpls@ietf.org; TEAS WG; ospf@ietf.org; Isis-wg
>
> > Cc: isis-chairs@ietf.org; draft-ietf-mpls-residence-time@tools.ietf.org=
;
> TEAS
>
> > WG Chairs; mpls-chairs@ietf.org; ospf-chairs@ietf.org
>
> > Subject: [OSPF] Working group last call on draft-ietf-mpls-residence-ti=
me
>
> >
>
> > Working Groups,
>
> >
>
> > This is to initiate a two week working group last call in four working
> groups on
>
> > draft-ietf-mpls-residence-time-13.
>
> >
>
> > The MPLS working group has done an earlier working group last call and =
a
>
> > request for publication has been made.
>
> >
>
> > The changes to the document were such that we decided to do a new
>
> > working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.
>
> >
>
> > There are three major changes between the version of the document for
>
> > which publication was requested are:
>
> >
>
> > (1) that section 7 " One-step Clock and Two-step Clock Modes" has been
>
> >      moved up to become section 2.1.
>
> > (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM
>
> >      Capability when IS-IS used advertise RTM capabilities
>
> > (3) BGP-LS has been added as a RTM capability advertisement method
>
> >
>
> > A side-by-side diff between version -12 and -13 is available at:
>
> > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residence-time-13
>
> >
>
> > Please send your comments to the mpls wg mailing list (mpls@ietf.org),
> if
>
> > you are not subscribed to the mpls wg list, send to "your own"
>
> > working group mailing list, and we'll make sure they are posted to the
> MPLS
>
> > wg list.
>
> >
>
> > There were one IPR disclosure against this document.
>
> >
>
> > All the authors and contributors have stated on the working group
> mailing list
>
> > that they are not aware of any other IPRs that relates to this document=
.
>
> >
>
> > This working group last call ends February 13, 2017.
>
> >
>
> >
>
> > /Loa
>
> > MPLS wg co-chairs
>
> > --
>
> >
>
> >
>
> > Loa Andersson                        email: loa@mail01.huawei.com
>
> > Senior MPLS Expert                          loa@pi.nu
>
> > Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> >
>
> > _______________________________________________
>
> > OSPF mailing list
>
> > OSPF@ietf.org
>
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>
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--001a113ce9bcbee92905477fd6da
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Uma,<div>below is the update to address your suggestion=
:</div><div>OLD TEXT</div><div><pre>   o  Length value equals number of oct=
ets of the Value field.

   o  Value contains variable number of bit-map fields so that overall
      number of bits in the fields equals Length * 8.

   o  Bits are defined/sent starting with Bit 0.  Additional bit-map
      field definitions that may be defined in the future SHOULD be
      assigned in ascending bit order so as to minimize the number of
      bits that will need to be transmitted.

   o  Undefined bits MUST be transmitted as 0 and MUST be ignored on
      receipt.

   o  Bits that are NOT transmitted MUST be treated as if they are set
      to 0 on receipt.
</pre></div><div>NEW TEXT</div><div><pre style=3D"color:rgb(0,0,0);word-wra=
p:break-word;white-space:pre-wrap">   o  Definitions, rules of handling, an=
d values for fields Length and
      Value are as defined in Section 4.3</pre><pre style=3D"color:rgb(0,0,=
0);word-wrap:break-word;white-space:pre-wrap">-----</pre><pre style=3D"colo=
r:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">I think that text r=
egarding RTM Capability field can stay even though, effectively, it duplica=
tes the definition of the field and points to 4.3.</pre><pre style=3D"color=
:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">What do you think?</=
pre><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wra=
p"><br></pre><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-spac=
e:pre-wrap">Regards,</pre><pre style=3D"color:rgb(0,0,0);word-wrap:break-wo=
rd;white-space:pre-wrap">Greg</pre></div></div><div class=3D"gmail_extra"><=
br><div class=3D"gmail_quote">On Wed, Feb 1, 2017 at 9:34 AM, Uma Chunduri =
<span dir=3D"ltr">&lt;<a href=3D"mailto:uma.chunduri@huawei.com" target=3D"=
_blank">uma.chunduri@huawei.com</a>&gt;</span> wrote:<br><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_-7673549159377360474WordSection1">
<p class=3D"MsoNormal"><a name=3D"m_-7673549159377360474__MailEndCompose"><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:#1f497d">Dear Greg,<u></u><u></u></span></a></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">Your changes look good to me.<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">Nit: =C2=A0Now, you would have notice=
d the text duplicated (couple of bullet points), which could have been avoi=
ded by just reference.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Br=
ush Script MT&quot;;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Brush Script MT&quo=
t;;color:#0070c0">Best Regards,<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">--</span><span style=3D"font-size:11.=
0pt;font-family:&quot;Freestyle Script&quot;;color:#1f497d"><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">Uma C.</span><span style=3D"font-size=
:11.0pt;font-family:&quot;Brush Script MT&quot;;color:#1f497d"><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"><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"> Greg Mirsky [mailto:<a href=3D=
"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br><span class=3D"">
<b>Sent:</b> Tuesday, January 31, 2017 7:19 PM<br>
</span><b>To:</b> Uma Chunduri &lt;<a href=3D"mailto:uma.chunduri@huawei.co=
m" target=3D"_blank">uma.chunduri@huawei.com</a>&gt;<br>
<b>Cc:</b> Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com=
" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=3D"mailto:mpls@ietf=
.org" target=3D"_blank">mpls@ietf.org</a>; <a href=3D"mailto:isis-chairs@ie=
tf.org" target=3D"_blank">isis-chairs@ietf.org</a>; Isis-wg &lt;<a href=3D"=
mailto:isis-wg-bounces@ietf.org" target=3D"_blank">isis-wg-bounces@ietf.org=
</a>&gt;; <a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" =
target=3D"_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; T=
EAS WG Chairs &lt;<a href=3D"mailto:teas-chairs@ietf.org" target=3D"_blank"=
>teas-chairs@ietf.org</a>&gt;; <a href=3D"mailto:mpls-chairs@ietf.org" targ=
et=3D"_blank">mpls-chairs@ietf.org</a>; TEAS WG &lt;<a href=3D"mailto:teas@=
ietf.org" target=3D"_blank">teas@ietf.org</a>&gt;;
 <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; <a h=
ref=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.org<=
/a></span></p><div><div class=3D"h5"><br>
<b>Subject:</b> Re: [mpls] [OSPF] Working group last call on draft-ietf-mpl=
s-residence-time<u></u><u></u></div></div><p></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi Uma, Acee, Les, et. al,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">attached please find diff and the updated version. I=
 think I&#39;ve got it right by now.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greatly appreciate your comments.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Tue, Jan 31, 2017 at 10:22 AM, Uma Chunduri &lt;<=
a href=3D"mailto:uma.chunduri@huawei.com" target=3D"_blank">uma.chunduri@hu=
awei.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><a name=3D"m_-7673549159377360474_m_-234413684519440=
5828__MailEndCompose"><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif;color:#1f497d">Had a quick look at this diff.</span><=
/a><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">This is about unifying the encoding p=
arts in IGP to have a consistent view for BGP-LS encoding or keeping
 these separate and yet having a correct representation in BGP-LS for both =
IGPs.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=3D=3D</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">With variable length bit field for Se=
ction 4.5 and fixed 4 byte value (as indicated as MUST =C2=A0for length)
 in section 4.3 =C2=A0- I saw a discrepancy =C2=A0in section 4.6 (BGP-LS) w=
hich is referencing section 4.3.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">You have multiple options to fix this=
:</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828msolistparagraph"><s=
pan style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;co=
lor:#1f497d">1.</span><span style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif;color:#1f497d">Change section 4.3 to match section 4.5 (I am not sur=
e why we have to have variable length for this bit field to start with in t=
his case like rfc 7794=E2=80=A6but I won=E2=80=99t say much
 now)</span><u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828msolistparagraph"><s=
pan style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;co=
lor:#1f497d">2.</span><span style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif;color:#1f497d">Change Section 4.6 to represent differences in encodi=
ng section 4.5 and 4.3 correctly.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;text-indent:.5in;text-auto=
space:none">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;=
color:#1f497d">=E2=80=9C</span><span style=3D"font-size:10.0pt;font-family:=
&quot;Lucida Console&quot;">Length, RTM, and Reserved fields as defined in =
Section 4.3.=E2=80=9D</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">
<span style=3D"font-size:10.0pt;font-family:&quot;Lucida Console&quot;">=C2=
=A0=C2=A0 3. </span><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif;color:#1f497d">Lastly unify section 4.5 to 4.3 =C2=A0i.=
e., 4 byte value with 3 bits defined and 29 bits reserved.</span><u></u><u>=
</u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">--</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Uma C.</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<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-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"> mpls [mailto:<a href=3D"mailto=
:mpls-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, January 31, 2017 8:22 AM<br>
<b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a>; <a href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; Isis-wg &lt;<a href=3D"mailto:isis-wg-bounces@iet=
f.org" target=3D"_blank">isis-wg-bounces@ietf.org</a>&gt;;
<a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Cha=
irs &lt;<a href=3D"mailto:teas-chairs@ietf.org" target=3D"_blank">teas-chai=
rs@ietf.org</a>&gt;;
<a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.=
org</a>; TEAS WG &lt;<a href=3D"mailto:teas@ietf.org" target=3D"_blank">tea=
s@ietf.org</a>&gt;;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; <a hr=
ef=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] [OSPF] Working group last call on draft-ietf-mpl=
s-residence-time</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Looks good.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Les</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [<a href=3D"mailto:g=
regimirsky@gmail.com" target=3D"_blank">mailto:gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Tuesday, January 31, 2017 8:06 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time</span><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for your patience and apologies for missin=
g it.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Diff and the update been attached.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Tue, Jan 31, 2017 at 5:07 AM, Les Ginsberg (ginsb=
erg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Almost=E2=80=A6</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Please change the title of Section 7.=
5 to =E2=80=9CIS-IS RTM Capability sub-TLV=E2=80=9D.</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Please change the title of Table 5 to=
 =E2=80=9CIS-IS RTM Capability sub-TLV Registry Description=E2=80=9D.</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">The common point being since this is =
not exclusively for TLV 22 we do not want to say =E2=80=9Cfor TLV 22=E2=80=
=9D.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 Les</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [mailto:<a href=3D"m=
ailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Monday, January 30, 2017 11:43 PM</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time<u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">many thanks for your the most detailed suggestions. =
Hope I&#39;ve it right.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Mon, Jan 30, 2017 at 11:04 PM, Les Ginsberg (gins=
berg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@=
cisco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Greg =E2=80=93</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx for the quick turnaround.</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Section 4.5 (revised text)</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 The capability to suppor=
t RTM on a particular link (interface) is</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 advertised in a new sub-=
TLV which may be included in TLVs advertising</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Intemediate System (IS) =
Reachability on a specific link (TLVs 22, 23, 222, and 223).</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 The format for the RTM C=
apabilities sub-TLV is presented in Figure 5</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0 0=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 1=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 2</span><u></u=
><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0 0 1 2 3 4 5 =
6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 ...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-<wbr>+-+-+-+-+-+-+-+-+-+-+-+...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Type=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0 Leng=
th=C2=A0=C2=A0=C2=A0 | RTM |=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 ...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-<wbr>+-+-+-+-+-+-+-+-+-+-+-+...</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Figure 5: RTM Capability=
 sub-TLV</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=E2=80=A6 (Remainder unchanged)</span=
><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Section 7.5 (revised text)</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">7.5.=C2=A0 IS-IS RTM Capability sub-T=
LV
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 IANA is requested to ass=
ign a new Type for RTM capability sub-TLV</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 from the Sub-TLVs for TL=
Vs 22, 23, 141, 222, and 223 registry as</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 follows:</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 | Type | Descripti=
on | 22 | 23 | 141 | 222 | 223 | Reference=C2=A0=C2=A0=C2=A0=C2=A0 |</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 | TBA3 |=C2=A0=C2=
=A0=C2=A0=C2=A0 RTM =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0| y=C2=A0 | y=C2=A0 | n=
=C2=A0=C2=A0 | y=C2=A0=C2=A0 | y=C2=A0=C2=A0 | This document |</span><u></u=
><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=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 | Capability |=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=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=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 |</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 +------+----------=
---+----+---<wbr>-+-----+-----+-----+----------<wbr>-----+</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Table 5: IS-IS RTM Capability sub-TLV =
Registry Description</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0 Les</span><u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;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 #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"> Greg Mirsky [mailto:<a href=3D"m=
ailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Monday, January 30, 2017 10:36 PM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> Loa Andersson; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank=
">mpls@ietf.org</a>; TEAS WG;
<a href=3D"mailto:ospf@ietf.org" target=3D"_blank">ospf@ietf.org</a>; Isis-=
wg; <a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">
ospf-chairs@ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@=
tools.ietf.org" target=3D"_blank">
draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS WG Chairs; <a =
href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">
isis-chairs@ietf.org</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D=
"_blank">mpls-chairs@ietf.org</a><br>
<b>Subject:</b> Re: [OSPF] Working group last call on draft-ietf-mpls-resid=
ence-time</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">Hi Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">attached are diff and the updated version -14. Would=
 be much obliged to hear from you if the updates are according to your sugg=
estions and address your comments.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Kind regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<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>
<p class=3D"MsoNormal">On Mon, Jan 30, 2017 at 1:11 PM, Les Ginsberg (ginsb=
erg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<div>
<div>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
Loa -<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
The change for IS-IS encoding to utilize a sub-TLV of TLV 22 et al to adver=
tise RTM capability is a better solution than the previous proposal and thi=
s has my support.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
However, there are some details as regards the proposed sub-TLV that should=
 be revised.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
1)Rather than use a fixed 16 bit field for the flags I suggest you utilize =
the encoding style introduced in RFC 7794 (see Section 2.1) which allows fo=
r a variable length flags field. This addresses two issues:<u></u><u></u></=
p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 o You need never worry that the size of the flags field will b=
e too small for future extensions<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 o It minimizes the number of bytes required to be sent<u></u><=
u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
The latter point is something IS-IS has always been more conservative about=
 than OSPF because of the fixed size of an LSP set which can be advertised =
by a single router.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
2)In the IANA considerations you have limited the sub-TLV to being used in =
TLV 22 only, but there is no reason to do so. This does not allow MT to be =
supported and it needlessly prevents use of the sub-TLV by the RFC 5311 ext=
ensions (however unpopular those
 may be). I can understand why the sub-TLV may not be useful in TLV 141, th=
erefore I suggest the table in Section 7.5 be revised to be:<u></u><u></u><=
/p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0 | Type | Description | 22 | 23 | 141 | 222 | 223 | Refer=
ence=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
<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0+------+-------------+----+<wbr>----+-----+-----+-----+--=
-----<wbr>--------+=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0| TBA3 |=C2=A0=C2=A0=C2=A0 RTM=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=
=C2=A0| y=C2=A0 | y=C2=A0 | n=C2=A0=C2=A0 | y=C2=A0=C2=A0 | y=C2=A0=C2=A0 |=
 This document |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <u></u>
<u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0=C2=A0 +------+-------------+----+---<wbr>-+-----+-----+-----+-=
---------<wbr>-----+=C2=A0=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
i.e. &quot;y&quot; for all but TLV 141 (in case the ASCII art doesn&#39;t t=
ranslate well in your mailer).<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal">You should also remove the reference to RFC 5305 in =
Section 4.5 as it is too limiting. Simply referencing the IANA registry
<a href=3D"http://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-cod=
epoints.xhtml%23isis-tlv-codepoints-22-23-141-222-223" target=3D"_blank">
http://www.iana.org/<wbr>assignments/isis-tlv-<wbr>codepoints/isis-tlv-<wbr=
>codepoints.xhtml#isis-tlv-<wbr>codepoints-22-23-141-222-223</a> should be =
sufficient. All necessary references can be found there.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
3)An editorial correction:<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
Introduction 3<sup>rd</sup> paragraph:<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
s/ Althugh/ Although<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0=C2=A0 Les<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; -----Original Message-----<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; From: OSPF [mailto:<a href=3D"mailto:ospf-bounces@ietf.org" target=3D"=
_blank">ospf-bounces@ietf.org</a>] On Behalf Of Loa Andersson<u></u><u></u>=
</p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Sent: Monday, January 30, 2017 8:02 AM<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; To: <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</=
a>; TEAS WG; <a href=3D"mailto:ospf@ietf.org" target=3D"_blank">
ospf@ietf.org</a>; Isis-wg<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Cc: <a href=3D"mailto:isis-chairs@ietf.org" target=3D"_blank">isis-cha=
irs@ietf.org</a>;
<a href=3D"mailto:draft-ietf-mpls-residence-time@tools.ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-<wbr>time@tools.ietf.org</a>; TEAS<u></u>=
<u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; WG Chairs; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">m=
pls-chairs@ietf.org</a>;
<a href=3D"mailto:ospf-chairs@ietf.org" target=3D"_blank">ospf-chairs@ietf.=
org</a><u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Subject: [OSPF] Working group last call on draft-ietf-mpls-residence-t=
ime<u></u><u></u></p>
<div>
<div>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Working Groups,<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; This is to initiate a two week working group last call in four working=
 groups on<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; draft-ietf-mpls-residence-<wbr>time-13.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; The MPLS working group has done an earlier working group last call and=
 a<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; request for publication has been made.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; The changes to the document were such that we decided to do a new<u></=
u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.<u=
></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; There are three major changes between the version of the document for<=
u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; which publication was requested are:<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (1) that section 7 &quot; One-step Clock and Two-step Clock Modes&quot=
; has been<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0moved up to become section 2.1.<u></u><u=
></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM<u></u>=
<u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Capability when IS-IS used advertise RTM=
 capabilities<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; (3) BGP-LS has been added as a RTM capability advertisement method<u><=
/u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; A side-by-side diff between version -12 and -13 is available at:<u></u=
><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residen=
ce-time-13" target=3D"_blank">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
rfcdiff?<wbr>url2=3Ddraft-ietf-mpls-<wbr>residence-time-13</span></a><u></u=
><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank"><span style=3D"color:windowtext;text-de=
coration:none">mpls@ietf.org</span></a>), if<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; you are not subscribed to the mpls wg list, send to &quot;your own&quo=
t;<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; working group mailing list, and we&#39;ll make sure they are posted to=
 the MPLS<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; wg list.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; There were one IPR disclosure against this document.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; All the authors and contributors have stated on the working group mail=
ing list<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; that they are not aware of any other IPRs that relates to this documen=
t.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; This working group last call ends February 13, 2017.<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; /Loa<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; MPLS wg co-chairs<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; --<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; 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 email: <a href=3D"mailto:loa@mail01.huawei.com" target=3D"_bla=
nk">
<span style=3D"color:windowtext;text-decoration:none">loa@mail01.huawei.com=
</span></a><u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Senior MPLS Expert=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=
=C2=A0=C2=A0=C2=A0<wbr>=C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_blank=
">
<span style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><=
u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; Huawei Technologies (consultant)=C2=A0=C2=A0=C2=A0=C2=A0 phone: +46 73=
9 81 21 64<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; ______________________________<wbr>_________________<u></u><u></u></p>
</div>
</div>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; OSPF mailing list<u></u><u></u></p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"mailto:OSPF@ietf.org" target=3D"_blank"><span style=3D"colo=
r:windowtext;text-decoration:none">OSPF@ietf.org</span></a><u></u><u></u></=
p>
<p class=3D"m_-7673549159377360474m-2344136845194405828m7832089522784764482=
m8733016173006011846m2337760234444598969msoplaintext">
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ospf" target=3D"_blan=
k"><span style=3D"color:windowtext;text-decoration:none">https://www.ietf.o=
rg/mailman/<wbr>listinfo/ospf</span></a><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
______________________________<wbr>_________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org" target=3D"_blank">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" target=3D"_blank">ht=
tps://www.ietf.org/mailman/<wbr>listinfo/ospf</a><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>

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

--001a113ce9bcbee92905477fd6da--


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From: Uma Chunduri <uma.chunduri@huawei.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
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Subject: Re: [mpls] [OSPF] Working group last call on draft-ietf-mpls-residence-time
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--_000_25B4902B1192E84696414485F57268540187FBADSJCEML703CHMchi_--


From nobody Thu Feb  2 04:16:08 2017
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From: Stewart Bryant <stewart.bryant@gmail.com>
To: "draft-ietf-spring-segment-routing-mpls@ietf.org" <draft-ietf-spring-segment-routing-mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
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Subject: Re: [mpls] [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-06
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Here are a number of WGLC comments on this document.

- Stewart

                   Segment Routing with MPLS data plane
                draft-ietf-spring-segment-routing-mpls-06

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.

SB> This is SR MPLS. The above text implies a special header. Surely
SB> it appends a stack of MPLS label stack entries that encode the instructions
SB> as label values.

    A segment can
    represent any instruction, topological or service-based.
SB> and more!
    SR allows
    to enforce a flow through any topological path and service chain
    while maintaining per-flow state only at the ingress node to the SR
    domain.

SB> The above does not read well.
SB> Surely something like:
SB> SR allows an ingress node to steer a packet through a
SB> topological path specifying which service actions or other
SB> operations need to executed on arrival as a each specified node.

    Segment Routing can be directly applied to the MPLS architecture with
    no change in the forwarding plane.  This drafts describes how Segment
    Routing operates on top of the MPLS data plane.

===========================


2.  Illustration

    Segment Routing, applied to the MPLS data plane, offers the ability
    to tunnel services (VPN, VPLS, VPWS) from an ingress PE to an egress
    PE, without any other protocol than ISIS or OSPF
    ([I-D.ietf-isis-segment-routing-extensions] and
    [I-D.ietf-ospf-segment-routing-extensions]).  LDP and RSVP-TE
    signaling protocols are not required.

SB> Strictly no protocol is required as we did in MPLS-TP.
SB> What you are saying is that by embedding additional
SB> information in the the link state igp in use, you remove the
SB> dependence on LDP, and RSVP-TE, although of course RSVP-TE
SB> does run-time bandwidth accounting which you have to move to
SB> a central place.

SB> I suspect that the reader would be better served by putting the
SB> rest of this after explaining how the protocol mapping works.

==================


    Supporting MPLS services (VPN, VPLS, VPWS) with SR has the following
    benefits:

       Simple operation: one single intra-domain protocol to operate: the
       IGP.  No need to support IGP synchronization extensions as
       described in [RFC5443] and [RFC6138].

       Excellent scaling: one Node-SID per PE.

SB> Is this all it seems. If you are going to steer the packet
SB> I think you need more than one node-SID to get the packet there.
SB> I presume the point is (and it should be brought out) that with
SB> liberal label retention you have a label per adjacency that maps
SB> to the remote PE (in the RP), although only one is in the FIB. If you have
SB> an RSVP-TE path you have more than one label per PE, you have
SB> one per constructed path, but in the FIB you only need to specify
SB> a single label imposition, whilst in SR, you need to specify a
SB> multi-label imposition.

SB> As I understand it different vendors have different approaches
SB> to label aggregation which may further complicate the issue, but
SB> this text needs to be neutral on that point.


  3.  MPLS Instantiation of Segment Routing

    MPLS instantiation of Segment Routing fits in the MPLS architecture
    as defined in [RFC3031] both from a control plane and forwarding
    plane perspective:

    o  From a control plane perspective [RFC3031] does not mandate a
       single signaling protocol.  Segment Routing proposes to use the
       Link State IGP as its use of information flooding fits very well
       with label stacking on ingress.

SB> Surely you propose to be protocol agnostic? For example SR will work just as
SB> well with for example a pub-sub approach.

    o  From a forwarding plane perspective, Segment Routing does not
       require any change to the forwarding plane.

    When applied to MPLS, a Segment is a LSP and the 20 right-most bits
    of the segment are encoded as a label. This implies that, in the
    MPLS instantiation, the SID values are allocated within a reduced
    20-bit space out of the 32-bit SID space.

SB> That is a very strange way of saying that in MPLS SIDs are 20
SB> bits, although of course they are often less than 20 bits
SB> as other MPLS applications need to use the same label table.
SB> If SIDs were 32 bits, then you would need to encode them across
SB> multiple labels, which I have not seen proposed.

    The notion of indexed global segment fits the MPLS architecture
    [RFC3031] as the absolute value allocated to any segment (global or
    local) can be managed by a local allocation process (similarly to
    other MPLS signaling protocols).

SB> You need some text to introduce the above rather than pull it out
SB> of a hat.


    If present, SR can coexist and interworks with LDP and RSVP
    [I-D.ietf-spring-segment-routing-ldp-interop].

    The source routing model described in
    [I-D.ietf-spring-segment-routing] is inherited from the ones proposed
    by [RFC1940] and [RFC2460].  The source routing model offers the
    support for explicit routing capability.

SB> SR goes back prior to RFC791, which also included source routing.


    Contrary to RSVP-based explicit routes where tunnel midpoints
    maintain states, SR-based explicit routes only require per-flow
    states at the ingress edge router where the traffic engineer policy
    is applied.

SB> What about bandwidth management?

    Contrary to RSVP-based explicit routes which consist in non-ECMP
    circuits (similar to ATM/FR), SR-based explicit routes can be built
    as list of ECMP-aware node segments and hence ECMP-aware traffic
    engineering is natively supported by SR.

SB> You mean loose source routing, which is again an old concept.

    When Segment Routing is instantiated over the MPLS data plane the
    following applies:

    o  A list of segments is represented as a stack of labels.

SB> The items in the stack are technically LSEs.

    o  The active segment is the top label.

    o  The CONTINUE operation is implemented as an MPLS swap operation.
       The outgoing label value is computed as follows:

SB> CONTINUE need a reference

       *  When the same Segment Routing Global Block (SRGB, defined in
          [I-D.ietf-spring-segment-routing] is used throughout the SR
          domain, the outgoing label value is equal to the incoming label
          value.

       *  When different SRGBs are used, the outgoing label value is set
          as: [SRGB(next_hop)+index].

SB> This is a continue, so isn't it label = label + SRGB_base_next - SRGB_base_this?
SB> The order can be the other way around by this never gives negative numbers.


          If the index can't be applied to
          the SRGB (i.e.: if the index points outside the SRGB of the
          next-hop or the next-hop has not advertised a valid SRGB), then
          no outgoing label value can be computed and the next-hop MUST
          be considered as not supporting the MPLS operations for that
          particular SID.

SB> Presumably you also need to take a management action since the
SB> control plane should no allow the situation to occur.

       *  The index and the SRGB may be learned through different means.
          Obviously, the SRGB MUST be the one the index is related to.

SB> The above is a little opaque.


    o  The NEXT operation is implemented as an MPLS pop operation.  The
       NEXT operation does not require any mapping to an outgoing label
       hence the SRGB is irrelevant for this operation.

SB> NEXT needs a reference

    o  The PUSH operation is implemented as an MPLS push of a label
       stack.

SB> POP needs a reference, and don't you actually push one or more LSE?

    o  The Segment Routing Global Block (SRGB) values MUST be greater
       than 15 in order to preserve values 0-15 as defined in [RFC3032].

SB> What you are saying is that the SRGB base value must have a number
SB> greater than the top of the special purpose label space (0..15), although
SB> as it was expressed it looked like you wanted to have room for them
SB> in the SR label space.

SB> Indeed I think the document set conflates SGRB with SRGB_base and
SB> ought to define both terms.

SB> I think it might be worth noting that the obvious implementation of
SB> RFC7474 would be to move the ceiling of the SPLs rather than
SB> creating a new table in h/w and thus it would be sensible leave
SB> some space between 15 and SRGB-base.

======================


4.1.  Example 1
...

    In conclusion, the path followed by P1 is R1-R2--R3-R8.  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.



SB> Ah now how is that ECMP being calculated? If it is based on the
SB> labels in a stack without an EL, isn't there a tendency to reduce
SB> the entropy given the guideline to allocate the same SRGB everywhere?

=====================

5.1.  LDP LSP segment combined with IGP segments

    The example illustrates a segment-routing policy including IGP
    segments and LDP LSP segments.

                       SL1---S2---SL3---L4---SL5---S6
                                   |               |
                                   +---------------+

            Figure 4: LDP LSP segment combined with IGP segments

SB> This and the text that follows is very confusing. It would be helpful to define your
SB> SL, S, L notation up front.

==================


5.2.  RSVP-TE LSP segment combined with IGP segments

    The example illustrates a segment-routing policy including IGP
    segments and RSVP-TE LSP segments.

                        S1---S2---RS3---R4---RS5---S6
                                   |               |
                                   +---------------+

          Figure 5: RSVP-TE LSP segment combined with IGP segments

SB> Again starting with the notation would be helpful to the reader.

=============



    In the MPLS instantiation, as the packet travels through the SR
    domain, the stack is depleted and the segment list history is
    gradually lost.

SB> Strictly the history is not gradually lost, it is never there.
SB> When you see a label stack, you know the future of the packet
SB> but never the past.


==============


8.  Manageability Considerations

    This document describes the applicability of Segment Routing over the
    MPLS data plane.  Segment Routing does not introduce any change in
    the MPLS data plane.  Manageability considerations described in
    [I-D.ietf-spring-segment-routing] applies to the MPLS data plane when
    used with Segment Routing.

SB> Maybe I missed it, but I could not see any discussion on the implications
SB> for LSP-ping. Does that just work out of the box or does it need changes?

  9.  Security Considerations

    This document does not introduce additional security requirements and
    mechanisms other than the ones described in
    [I-D.ietf-spring-segment-routing].

SB> I think that the MPLS element of the security considerations might be
SB> better placed here with the rest of the MPLS text.
SB> By minimising the range of the labels used, isn't path guessing more
SB> of a concern, and isn't there a greater chance that a misforwarded packet
SB> will get to a destination rather than be dropped?
SB>
SB> Doesn't SR make it a tad easier for the pervasive monitoring people
SB> to figure out where a packet is going than in an LSP or RSVP-TE controlled
SB> network?




From nobody Thu Feb  2 08:24:05 2017
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Subject: [mpls] IPR Disclosure Huawei Technologies Co., Ltd 's Statement about IPR related to RFC 7307
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Dear Luyuan Fang, Quintin Zhao, Chao Zhou, Lianyuan Li, Kamran Raza, Daniel King:


An IPR disclosure that pertains to your RFC entitled "LDP Extensions for
Multi-Topology" (RFC7307) was submitted to the IETF Secretariat on  and has
been posted on the "IETF Page of Intellectual Property Rights Disclosures"
(https://datatracker.ietf.org/ipr/2924/). The title of the IPR disclosure is
"Huawei Technologies Co.,Ltd 's Statement about IPR related to RFC 7307"


Thank you

IETF Secretariat


From nobody Fri Feb  3 19:55:09 2017
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From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Working Group, authors,

I had a quick look at  draft-ietf-mpls-spring-lsp-ping-02, I have a few
small nits and questions for the authors.

1. FEC is a well know abbreviation in MPLS context, but it is not 
well-know in wider IETF context. It needs to be expanded at first
occurrence.

2. We have early allocation for this document, can you place the 
following not in the IANA section in section 10.1.

"Note to the RFC Editor (please remove before publication): IANA has
  made early allocation for sub-type 34, 35 and 35. The early allocation
  expires 2017-09-15."

And then we create a "#Protocol" sub-registry in  "Multi-Protocol Label
Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" We will 
need to define allocation policies and code point range. IMHO the policy
should be "Standards Action" and the code range 0-255.

And a last question, should BGP-LS be in that registry?

/Loa
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Mon Feb  6 08:40:37 2017
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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 Multiprotocol Label Switching of the IETF.

        Title           : Bidirectional Forwarding Detection (BFD) Directed Return Path
        Authors         : Greg Mirsky
                          Jeff  Tantsura
                          Ilya Varlashkin
                          Mach(Guoyi) Chen
	Filename        : draft-ietf-mpls-bfd-directed-05.txt
	Pages           : 8
	Date            : 2017-02-06

Abstract:
   Bidirectional Forwarding Detection (BFD) is expected to be able to
   monitor wide variety of encapsulations of paths between systems.
   When a BFD session monitors an explicitly routed unidirectional path
   there may be a need to direct egress BFD peer to use specific path
   for the reverse direction of the BFD session.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-bfd-directed-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-bfd-directed-05


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.

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Dear All,
authors decided to remove sections Segment Routing: MPLS Data Plane Case
and Bootstrapping BFD session with BFD Reverse Path over Segment Routed
tunnel from this document and address the Segment Routing case in the
future work. The new version has been submitted as
draft-ietf-mpls-bfd-directed-05
(see below) and, to the best of our knowledge and understanding, earlier
disclosed IPR is no longer applicable to this version.
We hope that the WG can conclude the WGLC using the latest version.

Best regards,
Greg

A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Multiprotocol Label Switching of the IETF.

        Title           : Bidirectional Forwarding Detection (BFD) Directed
Return Path
        Authors         : Greg Mirsky
                          Jeff  Tantsura
                          Ilya Varlashkin
                          Mach(Guoyi) Chen
        Filename        : draft-ietf-mpls-bfd-directed-05.txt
        Pages           : 8
        Date            : 2017-02-06

Abstract:
   Bidirectional Forwarding Detection (BFD) is expected to be able to
   monitor wide variety of encapsulations of paths between systems.
   When a BFD session monitors an explicitly routed unidirectional path
   there may be a need to direct egress BFD peer to use specific path
   for the reverse direction of the BFD session.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-bfd-directed-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-bfd-directed-05


Please note that it may take a couple of minutes from the time of submissio=
n
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<https://www.ietf.org/mailman/listinfo/mpls>On Mon, Sep 26, 2016 at 11:12
AM, Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Reshad,
> thank you for your comment. The current version of the draft has two
> references to RFC 7110:
>
>    - section 3.1.2 states that sub-TLVs defined in RFC 7110 may be used
>    to identify the reverse of the BFD session;
>    - section 3.1.3 states "The Segment Routing Tunnel sub-TLV MAY be used
>    in Reply Path TLV defined in [RFC7110
>    <https://tools.ietf.org/html/rfc7110>]"
>
> I think that the first reference does not introduce any problem. Would yo=
u
> agree? Is it the second reference you're concerned about?
>
> Regards, Greg
>
> On Thu, Sep 22, 2016 at 9:26 AM, Reshad Rahman (rrahman) <
> rrahman@cisco.com> wrote:
>
>> My understanding of 7110 is that an LSP Ping sub-tlv has to carry a FEC.
>> So I have the same concern raised by Carlos.
>>
>> Regards,
>> Reshad.
>>
>> From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
>> Date: Wednesday, September 7, 2016 at 2:12 PM
>> To: Greg Mirsky <gregimirsky@gmail.com>
>> Cc: Gregory Mirsky <gregory.mirsky@ericsson.com>, "spring-chairs@ietf.or=
g"
>> <spring-chairs@ietf.org>, mpls <mpls@ietf.org>, "bfd-chairs@ietf.org" <
>> bfd-chairs@ietf.org>
>> Subject: Re: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
>> Resent-From: <alias-bounces@ietf.org>
>> Resent-To: Jeffrey Haas <jhaas@pfrc.org>, Reshad <rrahman@cisco.com>
>> Resent-Date: Wednesday, September 7, 2016 at 2:13 PM
>>
>> Hi, Greg,
>>
>> It is becoming evident that we are not converging on this. I believe I
>> expressed my points, many of which I consider showstoppers, with enough
>> clarity. Instead of responding point-by-point, I will let others share
>> their opinions, if someone has interest and positions.
>>
>> Defining a sub-TLV for the MPLS LSP Ping Target FEC Stack (TFS) TLV that
>> does not specify a FEC and instead carries label values (S5.2 and S3.1.3=
 of
>> your draft) breaks things.
>>
>> Thanks,
>>
>> =E2=80=94 Carlos.
>>
>>
>> On Sep 2, 2016, at 9:15 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
>>
>> Hi Carlos, et. al,
>> please find my answers, comments and notes in-line tagged GIM>>.
>>
>> Regards, Greg
>>
>> On Fri, Aug 19, 2016 at 10:10 PM, Carlos Pignataro (cpignata) <
>> cpignata@cisco.com> wrote:
>>
>>> Shepherd, Chairs,
>>>
>>> I do not support this document advancing based on this new revision. I
>>> believe there are significant unaddressed major technical concerns. I l=
ist
>>> again some of these below.
>>>
>>> Dear Greg,
>>>
>>> I support the specification of the control/direction of the return path
>>> of a BFD session in an MPLS environment. However, this document is neit=
her
>>> well scoped nor technically sound. The new revision does not address th=
e
>>> concerns I previously shared either.  The new revision does remove the
>>> =E2=80=9CSegment Routing: IPv6 Data Plane Case=E2=80=9D. It is was not =
clear how the return
>>> path of a bidirectional LSP is IPv6 and not MPLS. This was an indicatio=
n
>>> that the document had not received adequate review (to catch that so la=
te)
>>>
>> GIM>> Greatly appreciate your thorough review.
>>
>>>
>>> Seemingly, I was likely not clear enough before with my descriptions,
>>> apologies; I will try again.
>>>
>>> [Reading your last sentence, I=E2=80=99ll point out though that a WG co=
nsensus
>>> call is with the shepherd and chairs. There is an inherent contradictio=
n
>>> between being enlightened by the discussion and not wanting to listen.]
>>>
>>>
>>> *Major Issues:*
>>>
>>> 1. Document scope and problem being solved.
>>>
>>> https://tools.ietf.org/html/draft-ietf-mpls-bfd-directed-03#section-2 d=
escribes
>>> the problem solved. It says:
>>>
>>>    BFD is best suited to monitor bi-directional co-routed paths.  In
>>>    most cases, given stable environments, the forward and reverse
>>>    directions between two nodes are likely to be co-routed.
>>>
>>> That statement is unsubstantiated, and arguably conjecture. I do not
>>> believe that =E2=80=9Cin most cases the forward and reverse directions =
between two
>>> nodes are likely to be co-routed.=E2=80=9D
>>> If the document makes that claim, based on which the problem statement
>>> is supported, please provide an adequate citation.
>>>
>> GIM>> Carlos, I agree that this assertion is outside the scope of this
>> document. Will remove it in the next version.
>>
>>>
>>> IGP Metrics are not symmetric, very many times!
>>>
>>>
>>> It then goes to describe the problem as:
>>>
>>>    o  a failure detection by ingress node on the reverse path cannot be
>>>       interpreted as bi-directional failure with all the certainty and
>>>       thus trigger, for example, protection switchover of the forward
>>>       direction without possibility of being a false positive defect
>>>       notification.
>>>
>>> But this mis-describes the problem statement. It really has not to do
>>> with co-routedness. In fact, the problem statement is applicable to uni=
 and
>>> bidirectional (co-routed or associated).
>>>
>>> For bidirectional, test both directions, for unidirectional, minimize
>>> false negatives.
>>>
>>> GIM>> I don't agree that the same problem exists for bi-directional
>> LSPs, co-routed or associated. According to Section 3.7 of RFC 6428 p2p
>> bi-directional LSP can be monitored by single BFD session in coordinated
>> mode. In the coordinated mode the egress LSR uses sends BFD control pack=
ets
>> to ingress without any additional instructions.The independent mode is m=
ore
>> suitable for the associated bi-directional LSPs as each direction is
>> monitored by the dedicated BFD session that, sets bfd.MinRxInterval to z=
ero
>> so that the ingress node instructs the egress not to transmit BFD contro=
l
>> packets. Thus in independent mode the reverse path is not being used at =
all
>> and in coordinated mode the reverse path uses the reverse direction of t=
he
>> bi-directional LSP.
>>
>> Even before the document says:
>>>
>>>   The fact that BFD control
>>>    packets are not guaranteed to cross the same links and nodes in both
>>>    forward and reverse directions is a significant factor in producing
>>>    false positive defect notifications, i.e. false alarms, if used by
>>>    the ingress BFD peer to deduce the state of the forward direction.
>>>
>>> This is a mischaracterization. A return path going over the same nodes
>>> and links as the forward path does not guarantee or maximize the chance=
s of
>>> the return path being the best path. A misprograming of LFIB in one
>>> direction does not affect the other one, the receive and transmit optic=
s
>>> are different, etc.
>>>
>> GIM>> The document does not state that ensuring co-routedness guarantees
>> avoidance of the false negative defects. But the document, as RFC 7110,
>> states that ability to control the reverse path is beneficial and improv=
es
>> robustness of the OAM tool. If the LFIB is mis-programmed in the forward
>> direction after the BFD session reached Up state, the egress LSR, accord=
ing
>> to RFC 5880, will indicate that by setting value of Diag field to Contro=
l
>> Detection Time Expired (1). Further investigation, perhaps using LSP Pin=
g,
>> will be able to localize the defect to the particular node.
>>
>>>
>>> Net-net, sections 1 and 2 require a major rewriting. RFC 7110 is so ver=
y
>>> much more deliberately scoped.
>>>
>>> 2. Lack of feasibility of use cases.
>>>
>>> SR does not work as described in this document, and SR co-routed is mos=
t
>>> times NOT possible. Most use cases of segment routing do not allow for
>>> building a co-routed return path.
>>>
>>> Take Figure 3 from this document for example:
>>>
>>>            C---------D
>>>            |         |
>>>    A-------B         G-----H
>>>            |         |
>>>            E---------F
>>>
>>>
>>> If a forward direction between =E2=80=9CA=E2=80=9D and =E2=80=9CH=E2=80=
=9D has the following Node SIDs:
>>> {G; H}, then it is not possible to know if it=E2=80=99s going ABCDGH or=
 ABEFGH. How
>>> is then the return path to be constructed to be co-routed?
>>>
>>> Now, assume that the link between B and C is actually 3 parallel links,
>>> and there=E2=80=99s a Parallel Adj-SID (https://tools.ietf.org/html/d
>>> raft-ietf-spring-segment-routing-09#section-3.5.1) with 8% weight on a
>>> link and 92% on a second (0% on a third). How is the return path
>>> constructed?
>>>
>> GIM>> Carlos, RFC 5884 suggest to have BFD session per each ECMP path.
>> That was further clarified in RFC 7726.
>> I believe this is the major issue with this document.I think that method=
s
>> of setting BFD sessions over ECMP are outside the scope of this document=
.
>>
>>>
>>>
>>> As I mentioned already, the sub-TLVs for TFS defined in
>>> draft-ietf-mpls-spring-lsp-ping should be used =E2=80=94 and not define=
 a
>>> sub-TLV that actually does NOT work with LSP Ping.
>>>
>> GIM>> The draft-ietf-mpls-spring-lsp-ping does not address BFD session
>> bootstrapping scenario at all. The proposed BFD Reverse Path TLV does wo=
rk
>> with the LSP Ping as it follows the logic of Reply Path TLV defined in R=
FC
>> 7110. The Segment Routing MPLS Tunnel sub-TLV should not be used for
>> verification by the egress LSR but used as-is. If you have alternative
>> technical proposal, please present it in the form that we can discuss it
>> and compare with the one we have at the moment.
>>
>>>
>>> 3. Lack of practicality also (or at least missing explanation in the
>>> document of when things might not work in practice)
>>>
>>> Further, most cases will NOT specify every node (and every link) as thi=
s
>>> document seems to expect (otherwise, it=E2=80=99s a very loose source r=
outed return
>>> path.
>>>
>>> RFC 7855 says:
>>>
>>>    It is obvious that, in the case of long, strict source-routed paths,
>>>    the deployment is possible if the head-end of the explicit path
>>>    supports the instantiation of long explicit paths.
>>>
>>> Which grossly limits the real and practical feasibility.
>>>
>>> GIM>> The proposed solution enables control of the reverse path of the
>> BFD session. Whether the reverse path will be specified as strict or loo=
se
>> SR MPLS Tunnel is the decision of the operator and network architecture.
>>
>>>
>>> 4. Protocol Constructs.
>>>
>>> Section 3.1.1 of this document utilizes the same approach as in RFC
>>> 7110, which is to include a Target FEC Stack (TFS) from LSP Ping that
>>> identifies the return LSP to be used. So does Section 3.1.2, also direc=
tly
>>> modeling after RFC 7110.
>>>
>>> However, Section 3.1.3. uses "Label Entry n=E2=80=9D (assuming this mea=
ns =E2=80=9CLabel
>>> Stack Entry=E2=80=9D).
>>>
>>> This is a major and significant departure. Instead of specifying the
>>> FEC, it specifies the Label numerically. I believe that the FEC should =
be
>>> used (as defined in the appropriate MPLS LSP Ping for SR document), and=
 NOT
>>> the numerical value of a label. Why this departure?
>>>
>>> Having a Segment Routing section not talk about SIDs, not
>>> differentiating Node SIDs vs. Adj-SIDs, and not talking about FECs, is
>>> clearly missing something fundamental=E2=80=A6
>>>
>>> GIM>> As noted earlier, the SR MPLS Tunnel sub-TLV specifies SR tunnel
>> while other sub-TLVs refer to existing LSP. I don't see rationale to
>> provide FEC information for the reverse path since the egress LSR will n=
ot
>> use it but apply the LSE "as-is".
>>
>>>
>>> 5. Reply-mode-simple?
>>>
>>> By the way, the approach of RFC 7737 which updates RFC 7110, should be
>>> considered. That is, if there;s a =E2=80=9Cspecified return path=E2=80=
=9D element without
>>> an actual return path, then the return node injects responses into the
>>> return path of a bidirectional LSP. This approach greatly simplifies
>>> operations in presence of bidir LSPs.
>>>
>> GIM>> I've mentioned RFC 6428 earlier. I believe that it sufficiently
>> describes two modes of using BFD over bi-directional LSP. Neither
>> coordinated, nor independent mode has problem with the reverse path of t=
he
>> BFD session.
>>
>>>
>>>
>>> 5. Major Conflict created with LSP Ping
>>>
>>> As just mentioned, somehow, this document defines an =E2=80=9CSegment R=
outing
>>> MPLS Tunnel sub-TLV=E2=80=9D using Labels.
>>>
>>> This is defined within an LSP Ping Registry: "Sub-TLVs for TLV Types 1,
>>> 16, and 21"
>>>
>>> However, how this sub-TLV works for LSP Ping with a TLV Type 1 of Targe=
t
>>> FEC Stack is a mystery. It does NOT.
>>>
>>> This major conflict is created by specifying an LSP Ping protocol
>>> construct outside LSP Ping, and worst yet with an LSE. Instead, I recom=
mend
>>> this document for BFD actually uses the MPLS LSP Ping for SR sub-TLVs
>>> defined (for TFS for Node-SID, Adj-SID, etc), draft-ietf-mpls-spring-ls=
p-pin
>>> g.
>>>
>>> GIM>> Carlos, I don't see how you can refer to it as any kind of
>> authoritative source when BFD bootstrapping is missing altogether.
>>
>>>
>>>
>>> 6. Race Conditions unidentified.
>>>
>>> This document does not explain what happens if both ends of a
>>> bidirectional LSP start the same procedure, and how this disambiguation=
 is
>>> done. This is a big gap and source of operational issues.
>>>
>>> GIM>> Since RFC 5884 every reasonable implementation supports
>> Active/Passive role for BFD over MPLS LSP. No difference here. In case b=
oth
>> BFD peers configured as Active, operator will end up with two BFD sessio=
ns
>> and, I expect, will remove one once he/she realizes the situation.
>>
>>
>>> 7. BFD Session maintenance unspecified.
>>>
>>> RFC 7110 does not deal with the maintenance of a long-lived session.
>>> However, a BFD session is expected to remain with state maintained for =
some
>>> time (as oppose to an asynchronous LSP Ping). What happens if the retur=
n
>>> FEC requested suddenly goes down?
>>>
>> GIM>> In RFC 5884 have been noted:
>>         "LSP Ping is used to periodically verify the control plane
>>
>>          against the data plane by ensuring that the LSP is mapped to
>>          the same FEC, at the egress, as the ingress."
>>
>> Along the same approach, LSP Ping with BFD Reverse Path TLV MAY be used =
to verify and/or update the egress LSR which reverse path to use.
>>
>> Will clarify that in the next version.
>>
>>
>>
>>
>>> This problem gets compounded for the SR case as presented, since its no=
t
>>> using a FEC...
>>>
>>> I=E2=80=99ll stop here because I am running out of ink.
>>>
>>> Best,
>>>
>>> =E2=80=94 Carlos.
>>>
>>>
>>> On Aug 17, 2016, at 6:19 PM, Gregory Mirsky <gregory.mirsky@ericsson.co=
m>
>>> wrote:
>>>
>>> Hi Carlos,
>>> I believe that new version of the draft addresses all technical comment=
s
>>> and now are discussing what each of us believes and how we interpret th=
is
>>> or that IETF document. While this is very enlightening and I enjoy this
>>> discussion very much I don=E2=80=99t see that I can change how you see =
the problem
>>> this proposal addresses. The MPLS WG had agreed that the problem is rea=
l
>>> and the proposed solution, within the scope defined, is technically sou=
nd.
>>>
>>>
>>> Regards,
>>>         Greg
>>>
>>>
>>>
>>> *From:* Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com
>>> <cpignata@cisco.com>]
>>> *Sent:* Tuesday, August 16, 2016 10:02 AM
>>> *To:* Gregory Mirsky <gregory.mirsky@ericsson.com>
>>> *Cc:* Martin Vigoureux <martin.vigoureux@nokia.com>; mpls <mpls@ietf.or=
g
>>> >; spring-chairs@ietf.org; bfd-chairs@ietf.org
>>> *Subject:* Re: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
>>>
>>> Hi, Greg,
>>>
>>> I think we got to the source of the technical disagreement. Please find
>>> some closing comments inline.
>>>
>>>
>>> On Aug 16, 2016, at 12:22 PM, Gregory Mirsky <
>>> gregory.mirsky@ericsson.com> wrote:
>>>
>>> Hi Carlos,
>>> thank you for clarification of your concerns. Please find my notes
>>> in-line and tagged GIM3>>.
>>>
>>>                 Regards,
>>>                                 Greg
>>>
>>> *From:* Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com
>>> <cpignata@cisco.com>]
>>> *Sent:* Tuesday, August 16, 2016 6:14 AM
>>> *To:* Gregory Mirsky <gregory.mirsky@ericsson.com>
>>> *Cc:* Martin Vigoureux <martin.vigoureux@nokia.com>; mpls <mpls@ietf.or=
g
>>> >; spring-chairs@ietf.org; bfd-chairs@ietf.org
>>> *Subject:* Re: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
>>>
>>> Hi, Greg,
>>>
>>> Thank you for the follow-ups. Let me explain a couple of the key
>>> concerns top-posting, with more responses inline.
>>>
>>> One of the main technical concerns that I have is that segment routing
>>> being a loosely source-routed paradigm, there may not even be a
>>> bidirectional co-routed path.
>>> GIM3>> I don=E2=80=99t think that your characterization of the Segment =
Routing
>>> as mandating use only loosely source-routed paths is entirely accurate.=
 As
>>> in RSVP-TE, source-routed paths may be loosely or strictly source-route=
d.
>>> Excluding option to construct strictly source-routed paths, in my opini=
on,
>>> would significantly limit scope of the Source Routing technology.
>>>
>>> Take the extreme case of a stack in the forward direction with a single
>>> Node SID, PE to PE, and shortest path in-between. Or the case of Parall=
el
>>> Link SIDs with varied weights in different links. How are you providing=
 a
>>> return path?
>>> GIM3>> Authors do not claim that the proposed solution applies to all
>>> scenarios there could be in source routing. I think that has been alrea=
dy
>>> clarified in the text and in our discussion.
>>>
>>>
>>> Conversely, this potentially seems to apply to a grossly small and
>>> limited set of scenarios, if any, yet those scenarios are not discussed=
 in
>>> the document, and are not defined to my knowledge in any SPRING documen=
t =E2=80=94
>>> other than a mention in RFC 7855 of:
>>>
>>>    It is obvious that, in the case of long, strict source-routed paths,
>>>    the deployment is possible if the head-end of the explicit path
>>>    supports the instantiation of long explicit paths.
>>>
>>> which seems to refer to Node strictness and not necessarily Link
>>> strictness, and there is nothing in draft-ietf-spring-segment-r
>>> outing-09.
>>>
>>>
>>>
>>> Can you please point to a definition of a co-routed path for Segment
>>> Routing from the segment routing architectural documents?
>>> GIM3>> The proposal does not use bi-directional co-routed Segment Route=
d
>>> tunnels as such construct doesn=E2=80=99t yet exists (though in earlier=
 discussions
>>> there was some interest in investigating use case for it). On the other
>>> hand, definition of co-routedness can be found in MPLS-TP as =E2=80=9Cc=
o-routed,
>>> meaning both directions follow the same path, i.e. traversing the same =
set
>>> of nodes and links=E2=80=9D.
>>>
>>>
>>> There=E2=80=99s no mention of MPLS-TP or SPRING-TP in SPRING docs eithe=
r that I
>>> could find.
>>>
>>> If a SPRING stack includes a long set of Node SIDs, each one for each
>>> hop, still multiple-links between nodes are not specified and therefore=
 it
>>> is not clear how to provide the exact return path (when the link taken =
is
>>> unknown). If the problem space is limited to the case in which for each
>>> hop, both Node SID and Adj SID are included, no Anycast, no Parallel Li=
nk
>>> SID, etc., then practicality seems to get in the way.
>>>
>>>
>>>
>>> The second main concerns has to do with the proposed use of Labels
>>> (which can change) instead of FECs (like RFC 7110).
>>> GIM3>> Authors believe that this is workable solution and the return
>>> path for the BFD session identified by BFD Discriminator TLV may be
>>> re-signaled without affecting state of the session.
>>>
>>>
>>>
>>> There could perhaps be a use of specifying a return path in this case.
>>> However, I believe the use is not the scenario targeted, and it is not
>>> specifying data plane labels numerically.
>>>
>>>
>>> These two seem to be major technical obstacles to the draft.
>>>
>>>
>>>
>>> Please note there were some additional comments inline, but centered
>>> around the same set of topics.
>>>
>>> Thanks,
>>>
>>> =E2=80=94 Carlos.
>>>
>>>
>>> On Aug 10, 2016, at 3:34 PM, Gregory Mirsky <gregory.mirsky@ericsson.co=
m>
>>> wrote:
>>>
>>> Hi Carlos,
>>> thank you for your comments. I hope I understand your concerns better
>>> and am able to address them. Please find my follow up notes in-line tag=
ged
>>> GIM2>>.
>>>
>>>                 Regards,
>>>                                 Greg
>>>
>>> *From:* Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com
>>> <cpignata@cisco.com>]
>>> *Sent:* Tuesday, August 09, 2016 9:14 PM
>>> *To:* Gregory Mirsky <gregory.mirsky@ericsson.com>
>>> *Cc:* Martin Vigoureux <martin.vigoureux@nokia.com>; mpls <mpls@ietf.or=
g
>>> >; spring-chairs@ietf.org; bfd-chairs@ietf.org
>>> *Subject:* Re: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
>>>
>>> Hi Greg,
>>>
>>> Thanks for the response =E2=80=94 please find some follow-ups inline.
>>>
>>>
>>> On Jul 25, 2016, at 5:06 PM, Gregory Mirsky <gregory.mirsky@ericsson.co=
m>
>>> wrote:
>>>
>>> Hi Carlos,
>>> thank you for your comments. Please see my responses in-line and tagged
>>> GIM>>.
>>>
>>>                 Regards,
>>>                                 Greg
>>>
>>> *From:* mpls [mailto:mpls-bounces@ietf.org <mpls-bounces@ietf.org>] *On
>>> Behalf Of *Carlos Pignataro (cpignata)
>>> *Sent:* Saturday, July 16, 2016 8:35 AM
>>> *To:* Martin Vigoureux <martin.vigoureux@nokia.com>
>>> *Cc:* mpls <mpls@ietf.org>; spring-chairs@ietf.org; bfd-chairs@ietf.org
>>> *Subject:* Re: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
>>>
>>> Hi, Martin,
>>>
>>> Admittedly, I had not read or followed this document before. However, I
>>> just scanned through it, and I Have at best some fundamental questions =
and
>>> likely some major issues and concerns. I wonder also if you need to Cc =
the
>>> BFD WG, copying the chairs on this response. Copying also SPRING chairs=
 for
>>> awareness.
>>>
>>> I hope these are useful to this WGLC.
>>>
>>> *Major Concerns:*
>>>
>>> As I said, I just glanced through the document, and found these issues,
>>> questions, or problems.
>>>
>>> *1. Motivation for the work.*
>>>
>>> Uni or bi-directional? The document starts with a fallacy, setting the
>>> tone for the document, on the very first sentence:
>>>
>>> *Abstract*
>>>
>>> *   Bidirectional Forwarding Detection (BFD) is expected to monitor bi-=
*
>>> *   directional paths.*
>>>
>>> This is absolutely not the case, as explained in RFC 5880 Section 2, RF=
C
>>> 5883 Section 4.3 (https://tools.ietf.org/html/rfc5883#section-4.3), and
>>> many other places.
>>> GIM>> I think that you refer to the following text in RFC 5880:
>>>
>>>
>>> Not specifically, not only.
>>>
>>> My point is that the very first sentence contradicts standards tracks
>>> BFD RFCs. BFD also is expected to monitor unidirectional paths.
>>>
>>> GIM2>> Would the following change address your concern:
>>> OLD
>>> Bidirectional Forwarding Detection (BFD) is expected to monitor bi-
>>> directional paths. When a BFD session monitors an explicit routed    pa=
th
>>> there is a need to be able to direct egress BFD peer to use specific pa=
th
>>> for the reverse direction of the BFD session.
>>> NEW
>>>
>>> Bidirectional Forwarding Detection (BFD) is expected to monitor any kin=
d
>>> of paths between systems. When a BFD session monitors an explicitly rou=
ted
>>> uni-directional path there may be a need to direct egress BFD peer to u=
se
>>> specific path for the reverse direction of the BFD session.
>>>
>>>
>>>
>>> Since segment routing uses a loose source-routing paradigm, there may
>>> not be explicitly routed or a reverse direction.
>>>
>>>
>>>
>>>    BFD can provide failure detection on any kind of path between
>>>    systems, including direct physical links, virtual circuits, tunnels,
>>>    MPLS Label Switched Paths (LSPs), multihop routed paths, and
>>>    unidirectional links (so long as there is some return path, of
>>>    course).
>>> And this is exactly what motivated the work we=E2=80=99re discussing. C=
onsider
>>> the situation when the return path, though temporarily, is not availabl=
e.
>>> Consider scenario when node A sends BFD control packets over an LSP to =
node
>>> B and the node B sends its BFD packets over out of band return path, e.=
g.
>>> IP network.  If the loss of continuity between B and A lasts long enoug=
h to
>>> will detect failure. Should such failure be interpreted as indication o=
f
>>> the failure on the monitored LSP or not?
>>>
>>>
>>> But this is irrespective of wether the return path is explicit or not,
>>> or even if the return path is via some out of band channel. A different
>>> way, this is also the case for BFD multihop over plain IP (on a tunnel =
one
>>> way, hop-by-hop routed on the return).
>>>
>>> GIM2>> True, but we=E2=80=99re not solving these other scenarios, only =
those
>>> where monitored path is explicitly routed. We can add explicit statemen=
t
>>> listing out of the scope scenarios.
>>>
>>>
>>>
>>> See above.
>>>
>>>
>>>
>>>
>>>
>>>
>>> The second paragraph in the Introduction section explains the scenario
>>> when an explicitly routed LSP being monitored while the return path is =
over
>>> IP network that is based the shortest path paradigm.
>>>
>>>
>>> The fact that the return path goes over the same links as the forward
>>> path does not mean that the return path is misprogrammed but the forwar=
d
>>> path is correctly programmed.
>>> GIM2>> The purpose of making BFD session use co-routed path is not to
>>> verify how it is instantiated in LFIB on a LSR. That is the task for de=
fect
>>> localization, not defect detection OAM. Would you agree?
>>>
>>> I still believe that the motivation and use case is not well defined or
>>> explained.
>>>
>>> GIM2>> I=E2=80=99ll keep trying.
>>>
>>>
>>> The sentence that follows says:
>>>
>>> *   When a BFD session monitors an explicit routed*
>>> *   path there is a need to be able to direct egress BFD peer to use*
>>> *   specific path for the reverse direction of the BFD session.*
>>>
>>> The question is =E2=80=94 why is there that need?
>>> GIM>> Please see my comment above.
>>>
>>>
>>>
>>> I still believe this is a bit of a non sequitur. Why does BFD monitorin=
g
>>> an explicit routed path imply a need to direct the egress on a path for=
 the
>>> reverse direction? That=E2=80=99s not generally a =E2=80=9Cneed=E2=80=
=9D in all situations.
>>>
>>> GIM2>> Please see modified Abstract above. It uses =E2=80=9Cmay be a ne=
ed=E2=80=9D
>>>
>>>
>>> I think the passive voice hides precision needed.
>>>
>>>
>>>
>>> The document then goes on to say:
>>>
>>> *2.  Problem Statement*
>>>
>>> *   BFD is best suited to monitor bi-directional co-routed paths.*
>>>
>>> But: First, why is this the case? the BFD specifications do not say so.
>>> GIM>> If the paths used by forward and return paths are not co-routed
>>> that may create ambiguous situation when interpreting failure detection=
 on
>>> the node that sends BFD control packets onto the monitored path, e.g. L=
SP.
>>>
>>>
>>>
>>> First, the same ambiguity exists with bi-directional co-routed paths =
=E2=80=94
>>> because links and nodes are not the only resources that need to be comm=
on.
>>> FIBs can be programmed well on one direction and wrongly on the reverse=
.
>>> GIM2>> BFD, as other continuity check protocols, only performs defect
>>> detection. Defect localization and characterization usually performed w=
ith
>>> other tools. But having co-routed path for a test session reduces, not
>>> eliminates but reduces, ambiguity of defects of the reverse path.
>>>
>>>
>>> Can you please point to a definition of a co-routed path for Segment
>>> Routing from the segment routing architectural documents?
>>>
>>> Or are you defining that here?
>>>
>>>
>>>
>>> Second, again, why =E2=80=9Cbest suited=E2=80=9D? If the BFD specs say =
that BFD can
>>> monitor unidirectional paths (including MPLS LSPs and unidirectional
>>> links), seems BFD is not necessarily =E2=80=9Cbest suited to=E2=80=A6"
>>> GIM2>> BFD certainly can and being used to monitor uni-directional
>>> paths. And usually we don=E2=80=99t think of how the reverse path may a=
ffect defect
>>> detection or, in case of PM OAM, measured performance metric. Having te=
st
>>> session on bi-directional co-routed path makes the test result
>>> interpretation more certain.
>>>
>>>
>>>
>>> See above.
>>>
>>>
>>>
>>>
>>>
>>>
>>> And: Second, if there is a co-routed bidirectional path, then there is
>>> no need to specify the return path! The return path is basically =E2=80=
=9Cback on
>>> the other way on this co-routed bidirectional path=E2=80=9D, so there i=
s no need
>>> for what this document specifies.
>>> GIM>> AFAIK, only MPLS-TP defined p2p bi-directional co-routed LSP.
>>> True, co-routed bi-directional tunnel may be constructed by using
>>> combination of RSVP=E2=80=99s RRO and ERO as well. But other than that,=
 AFAIK, all
>>> objects monitored by multi-hop BFD are not guaranteed to be co-routed.
>>>
>>>
>>> If the path *is* bi-directional co-routed (by whichever method), you
>>> would not need this =E2=80=94 the was my point, not that some cases are=
 co-routed
>>> and others are not.
>>> GIM>> Yes, and the scope of this proposal is not on already
>>> bi-directional co-routed paths, e.g. MPLS-TP p2p bi-directional co-rout=
ed
>>> LSP. RSVP-TE LSP may be explicitly routed but are unidirectional. And s=
o SR
>>> tunnel.
>>>
>>>
>>>
>>>
>>> Next sentence:
>>>
>>> *   be co-routed, thus*
>>> *   fulfilling the implicit BFD requirement*
>>>
>>> But BFD never has this requirement, implicit or explicit.
>>> GIM>> If the goal of BFD to ensure reliable detection of failures, then
>>> co-routed multi-hop path is implied.
>>>
>>>
>>> I disagree. Even RFC 5883 says:
>>>
>>>    The Bidirectional Forwarding Detection (BFD) protocol [BFD] defines =
a
>>>    method for liveness detection of arbitrary paths between systems.
>>>
>>> and
>>>
>>>    BFD can also be useful on arbitrary paths between systems, which may
>>>    span multiple network hops and follow unpredictable paths.
>>>
>>> and
>>>
>>>    Furthermore, a pair of systems may have multiple paths between them
>>>    that may overlap.  This document describes methods for using BFD in
>>>    such scenarios.
>>>
>>> GIM2>> Will remove =E2=80=9C=E2=80=A6 thus fulfilling the implicit BFD =
requirement=E2=80=9D from
>>> the document.
>>>
>>>
>>>
>>> I am not going to further dissect each sentence, but the point is that
>>> if there=E2=80=99s something co-routed, there=E2=80=99s no need to expl=
icitly point to the
>>> return path. If there is not, then why?
>>> GIM>> If there=E2=80=99s no co-routedness between a monitored path and =
the
>>> return path, then this draft provides mechanism that may be used to rem=
ove
>>> possible ambiguity in interpretation of failure of the return path.
>>>
>>>
>>> *2. Technical feasibility*
>>>
>>> The second major problem area is the actual technical feasibility. A
>>> main motivation seems to be =E2=80=9C3.1.3.  Segment Routing: MPLS Data=
 Plane Case=E2=80=9D.
>>>
>>> However, looking at an SR path, it can be constructed by Node-SIDs and
>>> Adj-SIDs. Please refer to: https://tools.ietf.org/htm
>>> l/draft-ietf-spring-segment-routing-07#section-3.5
>>>
>>> First, Adj-SIDs SHOULD (not MUST) be assigned. This means there is the
>>> potential of an Adj-SID not assigned to a local Adj. There=E2=80=99s of=
 course also
>>> the cases in which Adj-SIDs can be assigned to bundles, to ECMP/UCMP
>>> groups, etc.
>>>
>>> The implication here is that there is a possibility that there is no wa=
y
>>> to exactly explicitly construct a co-routed return path. For example, i=
f
>>> the forward path is Node A -> Link X -> Node Z, then the return path ne=
eds
>>> to go to the node Z. Then it is a loose path (i.e., NOT co-routed) to t=
he
>>> adjacent node to A through link X, and then that node needs to have an
>>> Adj-SID on the same link, which might not.
>>> GIM>> Appreciate your detailed analysis of the Segment Routing use case=
.
>>> We didn=E2=80=99t spell it out in such details but will be glad to add
>>> applicability clarification based on your comment.
>>>
>>>
>>>
>>> I do not think it is about Applicability. Given the existence of
>>> Adj-SIDs, the question is about technical feasibility. What do you do i=
n
>>> the example I detailed above? Seems like there are potential cases in w=
hich
>>> it is not possible to specify the actual return path desired.
>>>
>>> GIM2>> There are many scenarios where it is possible and useful to
>>> specify strict explicit path for SR tunnel. To use strict or loose path=
s =E2=80=93
>>> that we leave to the operator to decide. The proposal addresses real
>>> scenario, though not all possible ones.
>>>
>>>
>>>
>>>
>>> The document does not seem to include this applicability. Still, can yo=
u
>>> please point to a definition of a co-routed path for Segment Routing fr=
om
>>> the segment routing architectural documents?
>>>
>>> There seems to be a difference between strict explicit routing (RSVP-TE=
)
>>> and this capability.
>>>
>>>
>>> *3. Actual Protocol Mechanics*
>>>
>>> Section 3.1.1.  BFD Reverse Path TLV, uses =E2=80=9CTarget FEC sub-TLV=
=E2=80=9D to
>>> define the reverse path. This is consistent with the approach in RFC 71=
10.
>>>
>>> In fact, Section 3.1.2 uses the RFC 7110 sub-TLVs for =E2=80=9CStatic a=
nd
>>> RSVP-TE sub-TLVs=E2=80=9D.
>>>
>>> However, Section 3.1.3, which seems to be a key motivation (=E2=80=9C3.=
1.3.
>>> Segment Routing: MPLS Data Plane Case=E2=80=9D), uses =E2=80=9CLabel En=
tries=E2=80=9D to specify
>>> the Path!
>>>
>>> I believe this is a serious technical issue. Instead of using Label
>>> values, it should use Target FEC Stacks (as with the few other cases
>>> above). Labels can change. With labels there is no validation possible =
that
>>> what distributed by a given label distribution protocol is what is mean=
t in
>>> the data plane.
>>> GIM>> I don=E2=80=99t see need to use Target FEC Stacks as the purpose =
of the
>>> BFD Reverse Path TLV not to verify mapping between the control and the =
data
>>> planes but to provide the remote BFD peer with pre-computed for the rev=
erse
>>> path.
>>>
>>>
>>> It is not about verification of the control and data planes in the
>>> return path.
>>>
>>> The reason why RFC 7110 uses FECs and not Labels is that the invariant
>>> is the FEC, while the label numerical value can change. Seems like usin=
g
>>> labels is less robust and more brittle.
>>>
>>> GIM2>> If label value changes, i.e. label withdrawn, then BFD return
>>> path for the BFD session may be re-signaled via LSP Ping with the same =
BFD
>>> discriminator.
>>>
>>>
>>> In fact, Section 5.2 is trying to assign this for the Target FEC Stack:
>>>
>>> *    | X (TBD2) | Segment Routing MPLS Tunnel sub-TLV | This document |=
*
>>>
>>> But that=E2=80=99s not a Target FEC! It=E2=80=99s a label value!
>>>
>>> This should be done by also using the Target FEC Stack.
>>>
>>> The Target FEC Stack for SR is defined at https://tools.ietf.org/html
>>> /draft-ietf-mpls-spring-lsp-ping-00, but surprisingly,
>>> draft-ietf-mpls-spring-lsp-ping (and the SR TFC thereby defined) are
>>> not even references in this document.
>>> GIM>> We haven=E2=80=99t updated the draft just because
>>> I-D.kumarkini-mpls-spring-lsp-ping got adopted by the WG. Will
>>> certainly update the reference in the next version.
>>>
>>> Section 3.3 of this document does include an older version of that
>>> draft, before WG adoption, and is somehow trying to Update it. Instead =
of
>>> updating it from here, it should discuss how to updated it on itself.
>>> GIM>> This document enhances LSP Ping for Segment Routing environment
>>> and we=E2=80=99ve proposed clarification to use of LSP Ping in Segment =
Routing when
>>> bootstrapping BFD session that, hopefully, will be discussed by MPLS WG=
 in
>>> course of this WGLC and used in draft-ietf-mpls-spring-lsp.
>>>
>>> As an aside, it=E2=80=99s not clear to me why WGLCing this document (tw=
ice)
>>> before moving forward with I-D.kumarkini-mpls-spring-lsp-ping.
>>>
>>>
>>>
>>> draft-ietf-mpls-spring-lsp-ping-00 seems to be a dependency to advance
>>> before this.
>>>
>>> I still do not understand the technical reason to use MPLS labels and
>>> not FECs. Further, using labels can suffer from misdirection if Label
>>> assignment changes (for a stable given FEC)
>>> GIM2>> Return path may be re-signaled in such case.
>>>
>>>
>>>
>>> The Section that follows is: =E2=80=9C3.2.  Segment Routing: IPv6 Data =
Plane
>>> Case=E2=80=9D, but in this case, I am mostly confused and baffled on ho=
w a set of
>>> IPv6 addresses can be an MPLS Target FEC Stack.
>>> GIM>> Agree, IPv6 case is outside the MPLS WG and I=E2=80=99ll remove i=
t for
>>> further study.
>>>
>>>
>>>
>>> OK.
>>>
>>> The issue about using labels (along with the other ones) still remain.
>>>
>>>
>>>
>>>
>>>
>>> *4. IPR*
>>>
>>> This document has IPR with specific licensing terms. I would like to
>>> understand what parts of the document are potentially covered and
>>> understand if there=E2=80=99s ways to work around that.
>>>
>>> In summary, browsing through the document, I see high-level problem are=
a
>>> issues, feasibility issues, technology issues, and others. Happy to be
>>> shown incorrect if I missed or confused anything.
>>>
>>>
>>>
>>> Thanks!
>>>
>>> Carlos.
>>>
>>>
>>> Thanks,
>>>
>>> =E2=80=94 Carlos.
>>>
>>>
>>>
>>>
>>>
>>> Thanks,
>>>
>>> =E2=80=94 Carlos.
>>>
>>>
>>> On Jul 10, 2016, at 1:59 PM, Martin Vigoureux <
>>> martin.vigoureux@nokia.com> wrote:
>>>
>>> WG,
>>>
>>> as said by Ross [1], I have been appointed Document Shepherd for
>>> draft-ietf-mpls-bfd-directed [2]. As such I am also running the second =
WG
>>> LC.
>>>
>>> So, this e-mail starts a WG LC which will end on the 31st of July.
>>>
>>> I'd like to remind that an IPR disclosure [3] exists against this
>>> document.
>>>
>>> So it is time to state whether or not you are in favour of progressing
>>> the document. Please also take the time to review the document and post
>>> comments on its content.
>>>
>>> Please respond to this call.
>>>
>>> Thank you
>>>
>>> Martin
>>>
>>>
>>> [1]: https://mailarchive.ietf.org/arch/msg/mpls/rxnEv4LnUiwh
>>> TiZOhowOC6AcHYU
>>> [2]: https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/
>>> [2]: https://datatracker.ietf.org/ipr/2769/
>>>
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>>
>>>
>>>
>>>
>>>
>>>
>>> <Mail Attachment.eml>
>>>
>>>
>>>
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>
>>
>>
>

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Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Dear All,<div>authors decided to remove sections=C2=A0<spa=
n style=3D"color:rgb(0,0,0);font-size:13.3333px">Segment Routing: MPLS Data=
 Plane Case and=C2=A0</span><span style=3D"color:rgb(0,0,0);font-size:13.33=
33px">Bootstrapping BFD session with BFD Reverse Path over</span><span styl=
e=3D"color:rgb(0,0,0);font-size:13.3333px">=C2=A0Segment Routed tunnel from=
 this document and address the Segment Routing case in the future work. The=
 new version has been submitted as=C2=A0</span><font color=3D"#000000"><spa=
n style=3D"font-size:13.3333px">draft-ietf-mpls-bfd-directed-05 (see below)=
 and, to the best of our knowledge and understanding, earlier disclosed IPR=
 is no longer applicable to this version.</span></font></div><div>We hope t=
hat the WG can conclude the WGLC using the latest version.</div><div><br></=
div><div>Best regards,</div><div>Greg</div><div class=3D"gmail_extra"><br><=
span style=3D"font-size:12.8px">A New Internet-Draft is available from the =
on-line Internet-Drafts directories.</span><br style=3D"font-size:12.8px"><=
span style=3D"font-size:12.8px">This draft is a work item of the Multiproto=
col Label Switching of the IETF.</span><br style=3D"font-size:12.8px"><br s=
tyle=3D"font-size:12.8px"><span style=3D"font-size:12.8px">=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Bidirectional=
 Forwarding Detection (BFD) Directed Return Path</span><br style=3D"font-si=
ze:12.8px"><span style=3D"font-size:12.8px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Aut=
hors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Greg Mirsky</span><br style=3D"font=
-size:12.8px"><span style=3D"font-size:12.8px">=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 Jeff=C2=A0 T=
antsura</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8p=
x">=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 Ilya Varlashkin</span><br style=3D"font-size:12.8px"><=
span style=3D"font-size:12.8px">=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 Mach(Guoyi) Chen</span><br=
 style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-ietf-mpls-bfd-dir=
ected-</span><wbr style=3D"font-size:12.8px"><span style=3D"font-size:12.8p=
x">05.txt</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.=
8px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0: 8</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.=
8px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 :=C2=A0</span><span class=3D"gmail-aBn" tabindex=3D"0" style=3D"font-si=
ze:12.8px"><span class=3D"gmail-aQJ">2017-02-06</span></span><br style=3D"f=
ont-size:12.8px"><br style=3D"font-size:12.8px"><span style=3D"font-size:12=
.8px">Abstract:</span><br style=3D"font-size:12.8px"><span style=3D"font-si=
ze:12.8px">=C2=A0 =C2=A0Bidirectional Forwarding Detection (BFD) is expecte=
d to be able to</span><br style=3D"font-size:12.8px"><span style=3D"font-si=
ze:12.8px">=C2=A0 =C2=A0monitor wide variety of encapsulations of paths bet=
ween systems.</span><br style=3D"font-size:12.8px"><span style=3D"font-size=
:12.8px">=C2=A0 =C2=A0When a BFD session monitors an explicitly routed unid=
irectional path</span><br style=3D"font-size:12.8px"><span style=3D"font-si=
ze:12.8px">=C2=A0 =C2=A0there may be a need to direct egress BFD peer to us=
e specific path</span><br style=3D"font-size:12.8px"><span style=3D"font-si=
ze:12.8px">=C2=A0 =C2=A0for the reverse direction of the BFD session.</span=
><br style=3D"font-size:12.8px"><br style=3D"font-size:12.8px"><br style=3D=
"font-size:12.8px"><span style=3D"font-size:12.8px">The IETF datatracker st=
atus page for this draft is:</span><br style=3D"font-size:12.8px"><a href=
=3D"https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/" rel=3D"=
noreferrer" target=3D"_blank" style=3D"font-size:12.8px">https://datatracke=
r.ietf.org/<wbr>doc/draft-ietf-mpls-bfd-<wbr>directed/</a><br style=3D"font=
-size:12.8px"><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8p=
x">There&#39;s also a htmlized version available at:</span><br style=3D"fon=
t-size:12.8px"><a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-bfd-d=
irected-05" rel=3D"noreferrer" target=3D"_blank" style=3D"font-size:12.8px"=
>https://tools.ietf.org/html/<wbr>draft-ietf-mpls-bfd-directed-<wbr>05</a><=
br style=3D"font-size:12.8px"><br style=3D"font-size:12.8px"><span style=3D=
"font-size:12.8px">A diff from the previous version is available at:</span>=
<br style=3D"font-size:12.8px"><a href=3D"https://www.ietf.org/rfcdiff?url2=
=3Ddraft-ietf-mpls-bfd-directed-05" rel=3D"noreferrer" target=3D"_blank" st=
yle=3D"font-size:12.8px">https://www.ietf.org/rfcdiff?<wbr>url2=3Ddraft-iet=
f-mpls-bfd-<wbr>directed-05</a><br style=3D"font-size:12.8px"><br style=3D"=
font-size:12.8px"><br style=3D"font-size:12.8px"><span style=3D"font-size:1=
2.8px">Please note that it may take a couple of minutes from the time of su=
bmission</span><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8=
px">until the htmlized version and diff are available at=C2=A0</span><a hre=
f=3D"http://tools.ietf.org/" rel=3D"noreferrer" target=3D"_blank" style=3D"=
font-size:12.8px">tools.ietf.org</a><span style=3D"font-size:12.8px">.</spa=
n><br style=3D"font-size:12.8px"><br style=3D"font-size:12.8px"><span style=
=3D"font-size:12.8px">Internet-Drafts are also available by anonymous FTP a=
t:</span><br style=3D"font-size:12.8px"><a href=3D"ftp://ftp.ietf.org/inter=
net-drafts/" rel=3D"noreferrer" target=3D"_blank" style=3D"font-size:12.8px=
">ftp://ftp.ietf.org/internet-<wbr>drafts/</a><br style=3D"font-size:12.8px=
"><br style=3D"font-size:12.8px"><span style=3D"font-size:12.8px">_________=
_____________________</span><wbr style=3D"font-size:12.8px"><span style=3D"=
font-size:12.8px">_________________</span><br style=3D"font-size:12.8px"><s=
pan style=3D"font-size:12.8px">mpls mailing list</span><br style=3D"font-si=
ze:12.8px"><a href=3D"mailto:mpls@ietf.org" style=3D"font-size:12.8px">mpls=
@ietf.org</a><br style=3D"font-size:12.8px"><div class=3D"gmail_quote"><a h=
ref=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" targe=
t=3D"_blank" style=3D"font-size:12.8px">https://www.ietf.org/mailman/<wbr>l=
istinfo/mpls</a></div><div class=3D"gmail_quote"><br></div><div class=3D"gm=
ail_quote"><a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"no=
referrer" target=3D"_blank" style=3D"font-size:12.8px"></a>On Mon, Sep 26, =
2016 at 11:12 AM, Greg Mirsky <span dir=3D"ltr">&lt;<a href=3D"mailto:gregi=
mirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt;</span> wr=
ote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr">Hi Reshad,<div>thank you for your=
 comment. The current version of the draft has two references to RFC 7110:<=
/div><div><ul><li>section 3.1.2 states that sub-TLVs defined in RFC 7110 ma=
y be used to identify the reverse of the BFD session;</li><li>section 3.1.3=
 states &quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">The Segm=
ent Routing Tunnel sub-TLV MAY be used in Reply Path TLV=C2=A0</span><span =
style=3D"color:rgb(0,0,0);font-size:13.3333px">defined in [</span><a href=
=3D"https://tools.ietf.org/html/rfc7110" title=3D"&quot;Return Path Specifi=
ed Label Switched Path (LSP) Ping&quot;" style=3D"font-size:13.3333px" targ=
et=3D"_blank">RFC7110</a><span style=3D"color:rgb(0,0,0);font-size:13.3333p=
x">]&quot;</span></li></ul><div><font color=3D"#000000"><span style=3D"font=
-size:13.3333px">I think that the first reference does not introduce any pr=
oblem. Would you agree? Is it the second reference you&#39;re concerned abo=
ut?</span></font></div></div><div><font color=3D"#000000"><span style=3D"fo=
nt-size:13.3333px"><br></span></font></div><div><font color=3D"#000000"><sp=
an style=3D"font-size:13.3333px">Regards, Greg</span></font></div></div><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Sep 22, 2016=
 at 9:26 AM, Reshad Rahman (rrahman) <span dir=3D"ltr">&lt;<a href=3D"mailt=
o:rrahman@cisco.com" target=3D"_blank">rrahman@cisco.com</a>&gt;</span> wro=
te:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204=
,204);padding-left:1ex">



<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:calibri,sans-serif">
<div>
<div>My understanding of 7110 is that an LSP Ping sub-tlv has to carry a FE=
C. So I have the same concern raised by Carlos.=C2=A0</div>
</div>
<div><br>
</div>
<div>Regards,</div>
<div>Reshad.</div>
<div><br>
</div>
<span>
<div style=3D"font-family:calibri;font-size:11pt;text-align:left;color:blac=
k;border-width:1pt medium medium;border-style:solid none none;border-bottom=
-color:initial;border-left-color:initial;padding:3pt 0in 0in;border-top-col=
or:rgb(181,196,223);border-right-color:initial">
<span style=3D"font-weight:bold">From: </span>&quot;Carlos Pignataro (cpign=
ata)&quot; &lt;<a href=3D"mailto:cpignata@cisco.com" target=3D"_blank">cpig=
nata@cisco.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Wednesday, September 7, 2016 =
at 2:12 PM<br>
<span style=3D"font-weight:bold">To: </span>Greg Mirsky &lt;<a href=3D"mail=
to:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt;<b=
r>
<span style=3D"font-weight:bold">Cc: </span>Gregory Mirsky &lt;<a href=3D"m=
ailto:gregory.mirsky@ericsson.com" target=3D"_blank">gregory.mirsky@ericsso=
n.com</a>&gt;, &quot;<a href=3D"mailto:spring-chairs@ietf.org" target=3D"_b=
lank">spring-chairs@ietf.org</a>&quot; &lt;<a href=3D"mailto:spring-chairs@=
ietf.org" target=3D"_blank">spring-chairs@ietf.org</a>&gt;,
 mpls &lt;<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org<=
/a>&gt;, &quot;<a href=3D"mailto:bfd-chairs@ietf.org" target=3D"_blank">bfd=
-chairs@ietf.org</a>&quot; &lt;<a href=3D"mailto:bfd-chairs@ietf.org" targe=
t=3D"_blank">bfd-chairs@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [mpls] 2nd WG LC on dr=
aft-ietf-mpls-bfd-directed<br>
<span style=3D"font-weight:bold">Resent-From: </span>&lt;<a href=3D"mailto:=
alias-bounces@ietf.org" target=3D"_blank">alias-bounces@ietf.org</a>&gt;<br=
>
<span style=3D"font-weight:bold">Resent-To: </span>Jeffrey Haas &lt;<a href=
=3D"mailto:jhaas@pfrc.org" target=3D"_blank">jhaas@pfrc.org</a>&gt;, Reshad=
 &lt;<a href=3D"mailto:rrahman@cisco.com" target=3D"_blank">rrahman@cisco.c=
om</a>&gt;<br>
<span style=3D"font-weight:bold">Resent-Date: </span>Wednesday, September 7=
, 2016 at 2:13 PM<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap:break-word">
Hi, Greg,
<div><br>
</div>
<div>It is becoming evident that we are not converging on this. I believe I=
 expressed my points, many of which I consider showstoppers, with enough cl=
arity. Instead of responding point-by-point, I will let others share their =
opinions, if someone has
 interest and positions.</div>
<div><br>
</div>
<div>Defining a sub-TLV for the MPLS LSP Ping Target FEC Stack (TFS) TLV th=
at does not specify a FEC and instead carries label values (S5.2 and S3.1.3=
 of your draft) breaks things.</div>
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>=E2=80=94 Carlos.</div>
<div><br>
</div>
<div><br>
<div>
<blockquote type=3D"cite">
<div>On Sep 2, 2016, at 9:15 PM, Greg Mirsky &lt;<a href=3D"mailto:gregimir=
sky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:</div>
<br>
<div>
<div dir=3D"ltr" style=3D"font-family:helvetica;font-size:12px;font-style:n=
ormal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent=
:0px;text-transform:none;white-space:normal;word-spacing:0px">
Hi Carlos, et. al,
<div>please find my answers, comments and notes in-line tagged GIM&gt;&gt;.=
</div>
<div><br>
</div>
<div>Regards, Greg</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On Fri, Aug 19, 2016 at 10:10 PM, Carlos Pignata=
ro (cpignata)<span>=C2=A0</span><span dir=3D"ltr">&lt;<a href=3D"mailto:cpi=
gnata@cisco.com" target=3D"_blank">cpignata@cisco.com</a><wbr>&gt;</span><s=
pan>=C2=A0</span>wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">Shepherd, Chairs,
<div><br>
</div>
<div>I do not support this document advancing based on this new revision. I=
 believe there are significant unaddressed major technical concerns. I list=
 again some of these below.</div>
<div><br>
</div>
<div>Dear Greg,</div>
<div><br>
</div>
<div>I support the specification of the control/direction of the return pat=
h of a BFD session in an MPLS environment. However, this document is neithe=
r well scoped nor technically sound. The new revision does not address the =
concerns I previously shared
 either.=C2=A0 The new revision does remove the =E2=80=9CSegment Routing: I=
Pv6 Data Plane Case=E2=80=9D. It is was not clear how the return path of a =
bidirectional LSP is IPv6 and not MPLS. This was an indication that the doc=
ument had not received adequate review (to catch that
 so late)</div>
</div>
</blockquote>
<div>GIM&gt;&gt; Greatly appreciate your thorough review.=C2=A0</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div>Seemingly, I was likely not clear enough before with my descriptions, =
apologies; I will try again.</div>
<div><br>
</div>
<div>[Reading your last sentence, I=E2=80=99ll point out though that a WG c=
onsensus call is with the shepherd and chairs. There is an inherent contrad=
iction between being enlightened by the discussion and not wanting to liste=
n.]</div>
<div><br>
</div>
<div><br>
</div>
<div><b><u>Major Issues:</u></b></div>
<div><br>
</div>
<div>1. Document scope and problem being solved.</div>
<div><br>
</div>
<div><a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-bfd-directed-03=
#section-2" target=3D"_blank">https://tools.ietf.org/html/dr<wbr>aft-ietf-m=
pls-bfd-directed-03#<wbr>section-2</a>=C2=A0describes the problem solved. I=
t says:</div>
<div><br>
</div>
<div>
<div>=C2=A0 =C2=A0BFD is best suited to monitor bi-directional co-routed pa=
ths.=C2=A0 In</div>
<div>=C2=A0 =C2=A0most cases, given stable environments, the forward and re=
verse</div>
<div>=C2=A0 =C2=A0directions between two nodes are likely to be co-routed.<=
/div>
</div>
<div><br>
</div>
<div>That statement is unsubstantiated, and arguably conjecture. I do not b=
elieve that =E2=80=9Cin most cases the forward and reverse directions betwe=
en two nodes are likely to be co-routed.=E2=80=9D</div>
<div>If the document makes that claim, based on which the problem statement=
 is supported, please provide an adequate citation.</div>
</div>
</blockquote>
<div>GIM&gt;&gt; Carlos, I agree that this assertion is outside the scope o=
f this document. Will remove it in the next version.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div>IGP Metrics are not symmetric, very many times!</div>
<div><br>
</div>
<div><br>
</div>
<div>It then goes to describe the problem as:</div>
<div><br>
</div>
<div>
<div>=C2=A0 =C2=A0o =C2=A0a failure detection by ingress node on the revers=
e path cannot be</div>
<div>=C2=A0 =C2=A0 =C2=A0 interpreted as bi-directional failure with all th=
e certainty and</div>
<div>=C2=A0 =C2=A0 =C2=A0 thus trigger, for example, protection switchover =
of the forward</div>
<div>=C2=A0 =C2=A0 =C2=A0 direction without possibility of being a false po=
sitive defect</div>
<div>=C2=A0 =C2=A0 =C2=A0 notification.</div>
</div>
<div><br>
</div>
<div>But this mis-describes the problem statement. It really has not to do =
with co-routedness. In fact, the problem statement is applicable to uni and=
 bidirectional (co-routed or associated).=C2=A0</div>
<div><br>
</div>
<div>For bidirectional, test both directions, for unidirectional, minimize =
false negatives.</div>
<div><br>
</div>
</div>
</blockquote>
<div>GIM&gt;&gt; I don&#39;t agree that the same problem exists for bi-dire=
ctional LSPs, co-routed or associated. According to Section 3.7 of RFC 6428=
 p2p bi-directional LSP can be monitored by single BFD session in coordinat=
ed mode. In the coordinated mode
 the egress LSR uses sends BFD control packets to ingress without any addit=
ional instructions.The independent mode is more suitable for the associated=
 bi-directional LSPs as each direction is monitored by the dedicated BFD se=
ssion that, sets bfd.MinRxInterval
 to zero so that the ingress node instructs the egress not to transmit BFD =
control packets. Thus in independent mode the reverse path is not being use=
d at all and in coordinated mode the reverse path uses the reverse directio=
n of the bi-directional LSP.</div>
<div><br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div></div>
<div>Even before the document says:</div>
<div><br>
</div>
<div>
<div>=C2=A0 The fact that BFD control</div>
<div>=C2=A0 =C2=A0packets are not guaranteed to cross the same links and no=
des in both</div>
<div>=C2=A0 =C2=A0forward and reverse directions is a significant factor in=
 producing</div>
<div>=C2=A0 =C2=A0false positive defect notifications, i.e. false alarms, i=
f used by</div>
<div>=C2=A0 =C2=A0the ingress BFD peer to deduce the state of the forward d=
irection.</div>
</div>
<div><br>
</div>
<div>This is a mischaracterization. A return path going over the same nodes=
 and links as the forward path does not guarantee or maximize the chances o=
f the return path being the best path. A misprograming of LFIB in one direc=
tion does not affect the
 other one, the receive and transmit optics are different, etc.</div>
</div>
</blockquote>
<div>GIM&gt;&gt; The document does not state that ensuring co-routedness gu=
arantees avoidance of the false negative defects. But the document, as RFC =
7110, states that ability to control the reverse path is beneficial and imp=
roves robustness of the OAM tool.
 If the LFIB is mis-programmed in the forward direction after the BFD sessi=
on reached Up state, the egress LSR, according to RFC 5880, will indicate t=
hat by setting value of Diag field to=C2=A0<span style=3D"font-size:13.3333=
px">Control Detection Time Expired
 (1). Further investigation, perhaps using LSP Ping, will be able to locali=
ze the defect to the particular node.</span></div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div>Net-net, sections 1 and 2 require a major rewriting. RFC 7110 is so ve=
ry much more deliberately scoped.</div>
<div><br>
</div>
<div>2. Lack of feasibility of use cases.</div>
<div><br>
</div>
<div>SR does not work as described in this document, and SR co-routed is mo=
st times NOT possible. Most use cases of segment routing do not allow for b=
uilding a co-routed return path.</div>
<div><br>
</div>
<div>Take Figure 3 from this document for example:</div>
<div><br>
</div>
<div>
<pre>           C---------D
           |         |
   A-------B         G-----H
           |         |
           E---------F</pre>
<div><br>
</div>
</div>
<div>If a forward direction between =E2=80=9CA=E2=80=9D and =E2=80=9CH=E2=
=80=9D has the following Node SIDs: {G; H}, then it is not possible to know=
 if it=E2=80=99s going ABCDGH or ABEFGH. How is then the return path to be =
constructed to be co-routed?</div>
<div><br>
</div>
<div>Now, assume that the link between B and C is actually 3 parallel links=
, and there=E2=80=99s a Parallel Adj-SID (<a href=3D"https://tools.ietf.org=
/html/draft-ietf-spring-segment-routing-09#section-3.5.1" target=3D"_blank"=
>https://tools.ietf.org/html/d<wbr>raft-ietf-spring-segment-routi<wbr>ng-09=
#section-3.5.1</a>)
 with 8% weight on a link and 92% on a second (0% on a third). How is the r=
eturn path constructed?</div>
</div>
</blockquote>
<div>GIM&gt;&gt; Carlos, RFC 5884 suggest to have BFD session per each ECMP=
 path. That was further clarified in RFC 7726.=C2=A0</div>
<div>I believe this is the major issue with this document.I think that meth=
ods of setting BFD sessions over ECMP are outside the scope of this documen=
t.=C2=A0</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div><br>
</div>
<div>As I mentioned already, the sub-TLVs for TFS defined in draft-ietf-mpl=
s-spring-lsp-pin<wbr>g should be used =E2=80=94 and not define a sub-TLV th=
at actually does NOT work with LSP Ping.</div>
</div>
</blockquote>
<div>GIM&gt;&gt; The draft-ietf-mpls-spring-lsp-pin<wbr>g does not address =
BFD session bootstrapping scenario at all. The proposed BFD Reverse Path TL=
V does work with the LSP Ping as it follows the logic of Reply Path TLV def=
ined in RFC 7110. The
 Segment Routing MPLS Tunnel sub-TLV should not be used for verification by=
 the egress LSR but used as-is. If you have alternative technical proposal,=
 please present it in the form that we can discuss it and compare with the =
one we have at the moment.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div>3. Lack of practicality also (or at least missing explanation in the d=
ocument of when things might not work in practice)</div>
<div><br>
</div>
<div>Further, most cases will NOT specify every node (and every link) as th=
is document seems to expect (otherwise, it=E2=80=99s a very loose source ro=
uted return path.=C2=A0</div>
<div><br>
</div>
<div>RFC 7855 says:</div>
<div><br>
</div>
<div>
<div>=C2=A0 =C2=A0It is obvious that, in the case of long, strict source-ro=
uted paths,</div>
<div>=C2=A0 =C2=A0the deployment is possible if the head-end of the explici=
t path</div>
<div>=C2=A0 =C2=A0supports the instantiation of long explicit paths.</div>
</div>
<div><br>
</div>
<div>Which grossly limits the real and practical feasibility.</div>
<div><br>
</div>
</div>
</blockquote>
<div>GIM&gt;&gt; The proposed solution enables control of the reverse path =
of the BFD session. Whether the reverse path will be specified as strict or=
 loose SR MPLS Tunnel is the decision of the operator and network architect=
ure.=C2=A0</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div></div>
<div><br>
</div>
<div>4. Protocol Constructs.</div>
<div><br>
</div>
<div>Section 3.1.1 of this document utilizes the same approach as in RFC 71=
10, which is to include a Target FEC Stack (TFS) from LSP Ping that identif=
ies the return LSP to be used. So does Section 3.1.2, also directly modelin=
g after RFC 7110.</div>
<div><br>
</div>
<div>However, Section 3.1.3. uses &quot;Label Entry n=E2=80=9D (assuming th=
is means =E2=80=9CLabel Stack Entry=E2=80=9D).=C2=A0</div>
<div><br>
</div>
<div>This is a major and significant departure. Instead of specifying the F=
EC, it specifies the Label numerically. I believe that the FEC should be us=
ed (as defined in the appropriate MPLS LSP Ping for SR document), and NOT t=
he numerical value of a
 label. Why this departure?</div>
<div><br>
</div>
<div>Having a Segment Routing section not talk about SIDs, not differentiat=
ing Node SIDs vs. Adj-SIDs, and not talking about FECs, is clearly missing =
something fundamental=E2=80=A6</div>
<div><br>
</div>
</div>
</blockquote>
<div>GIM&gt;&gt; As noted earlier, the SR MPLS Tunnel sub-TLV specifies SR =
tunnel while other sub-TLVs refer to existing LSP. I don&#39;t see rational=
e to provide FEC information for the reverse path since the egress LSR will=
 not use it but apply the LSE &quot;as-is&quot;.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div></div>
<div><br>
</div>
<div>5. Reply-mode-simple?</div>
<div><br>
</div>
<div>By the way, the approach of RFC 7737 which updates RFC 7110, should be=
 considered. That is, if there;s a =E2=80=9Cspecified return path=E2=80=9D =
element without an actual return path, then the return node injects respons=
es into the return path of a bidirectional
 LSP. This approach greatly simplifies operations in presence of bidir LSPs=
.</div>
</div>
</blockquote>
<div>GIM&gt;&gt; I&#39;ve mentioned RFC 6428 earlier. I believe that it suf=
ficiently describes two modes of using BFD over bi-directional LSP. Neither=
 coordinated, nor independent mode has problem with the reverse path of the=
 BFD session.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div><br>
</div>
<div>5. Major Conflict created with LSP Ping</div>
<div><br>
</div>
<div>As just mentioned, somehow, this document defines an =E2=80=9CSegment =
Routing MPLS Tunnel sub-TLV=E2=80=9D using Labels.</div>
<div><br>
</div>
<div>This is defined within an LSP Ping Registry: &quot;Sub-TLVs for TLV Ty=
pes 1, 16, and 21&quot;</div>
<div><br>
</div>
<div>However, how this sub-TLV works for LSP Ping with a TLV Type 1 of Targ=
et FEC Stack is a mystery. It does NOT.</div>
<div><br>
</div>
<div>This major conflict is created by specifying an LSP Ping protocol cons=
truct outside LSP Ping, and worst yet with an LSE. Instead, I recommend thi=
s document for BFD actually uses the MPLS LSP Ping for SR sub-TLVs defined =
(for TFS for Node-SID,
 Adj-SID, etc), draft-ietf-mpls-spring-lsp-pin<wbr>g.</div>
<div><br>
</div>
</div>
</blockquote>
<div>GIM&gt;&gt; Carlos, I don&#39;t see how you can refer to it as any kin=
d of authoritative source when BFD bootstrapping is missing altogether.</di=
v>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div></div>
<div><br>
</div>
<div><br>
</div>
<div>6. Race Conditions unidentified.</div>
<div><br>
</div>
<div>This document does not explain what happens if both ends of a bidirect=
ional LSP start the same procedure, and how this disambiguation is done. Th=
is is a big gap and source of operational issues.</div>
<div><br>
</div>
</div>
</blockquote>
<div>GIM&gt;&gt; Since RFC 5884 every reasonable implementation supports Ac=
tive/Passive role for BFD over MPLS LSP. No difference here. In case both B=
FD peers configured as Active, operator will end up with two BFD sessions a=
nd, I expect, will remove one
 once he/she realizes the situation.</div>
<div><br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div></div>
<div><br>
</div>
<div>7. BFD Session maintenance unspecified.</div>
<div><br>
</div>
<div>RFC 7110 does not deal with the maintenance of a long-lived session. H=
owever, a BFD session is expected to remain with state maintained for some =
time (as oppose to an asynchronous LSP Ping). What happens if the return FE=
C requested suddenly goes
 down?</div>
</div>
</blockquote>
<div>GIM&gt;&gt; In RFC 5884 have been noted:</div>
<div><font face=3D"arial,helvetica,sans-serif">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
&quot;<span>LSP Ping is used to periodically verify the control plane</span=
></font></div>
<pre style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"arial,helveti=
ca,sans-serif">         against the data plane by ensuring that the LSP is =
mapped to
         the same FEC, at the egress, as the ingress.&quot;</font></pre>
<pre style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"arial,helveti=
ca,sans-serif">Along the same approach, LSP Ping with BFD Reverse Path TLV =
MAY be used to verify and/or update the egress LSR which reverse path to us=
e.</font></pre>
<pre style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"arial,helveti=
ca,sans-serif">Will clarify that in the next version.</font></pre>
<pre style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"arial,helveti=
ca,sans-serif"><br></font></pre>
<pre style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></p=
re>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);p=
adding-left:1ex">
<div style=3D"word-wrap:break-word">
<div><br>
</div>
<div>This problem gets compounded for the SR case as presented, since its n=
ot using a FEC...</div>
<div><br>
</div>
<div>I=E2=80=99ll stop here because I am running out of ink.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>=E2=80=94 Carlos.</div>
<div><br>
</div>
<div><br>
<div>
<blockquote type=3D"cite">
<div>On Aug 17, 2016, at 6:19 PM, Gregory Mirsky &lt;<a href=3D"mailto:greg=
ory.mirsky@ericsson.com" target=3D"_blank">gregory.mirsky@ericsson.com</a>&=
gt; wrote:</div>
<br>
<div>
<div style=3D"font-family:helvetica;font-size:12px;font-style:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px">
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Hi Carlos,<u>=
</u><u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">I believe tha=
t new version of the draft addresses all technical comments and now are dis=
cussing what each of us believes and how we interpret this or that IETF doc=
ument. While this is
 very enlightening and I enjoy this discussion very much I don=E2=80=99t se=
e that I can change how you see the problem this proposal addresses. The MP=
LS WG had agreed that the problem is real and the proposed solution, within=
 the scope defined, is technically sound.<span>=C2=A0</span><u></u><u></u><=
/span></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif"><u></u>=C2=A0=
<u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt 0.25in;font-size:12pt;font-family:&qu=
ot;times new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Regards,<u></=
u><u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt 0.25in;font-size:12pt;font-family:&qu=
ot;times new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Greg<u></u><u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif"><u></u>=C2=A0=
<u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif"><u></u>=C2=A0=
<u></u></span></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif"><u></u>=C2=A0=
<u></u></span></div>
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><span style=3D"font-size:11pt;font-family:calibri,sans-serif">From:</spa=
n></b><span style=3D"font-size:11pt;font-family:calibri,sans-serif"><span>=
=C2=A0</span>Carlos Pignataro (cpignata) [<a href=3D"mailto:cpignata@cisco.=
com" style=3D"color:purple;text-decoration:underline" target=3D"_blank">mai=
lto:cpignata@cisco.com</a>]<span>=C2=A0</span><br>
<b>Sent:</b><span>=C2=A0</span>Tuesday, August 16, 2016 10:02 AM<br>
<b>To:</b><span>=C2=A0</span>Gregory Mirsky &lt;<a href=3D"mailto:gregory.m=
irsky@ericsson.com" style=3D"color:purple;text-decoration:underline" target=
=3D"_blank">gregory.mirsky@ericsson.com</a>&gt;<br>
<b>Cc:</b><span>=C2=A0</span>Martin Vigoureux &lt;<a href=3D"mailto:martin.=
vigoureux@nokia.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank">martin.vigoureux@nokia.com</a>&gt;; mpls &lt;<a href=3D"mailto=
:mpls@ietf.org" style=3D"color:purple;text-decoration:underline" target=3D"=
_blank">mpls@ietf.org</a>&gt;;<span>=C2=A0</span><a href=3D"mailto:spring-c=
hairs@ietf.org" style=3D"color:purple;text-decoration:underline" target=3D"=
_blank">spring-chairs<wbr>@ietf.org</a>;<span>=C2=A0</span><a href=3D"mailt=
o:bfd-chairs@ietf.org" style=3D"color:purple;text-decoration:underline" tar=
get=3D"_blank">bfd-chairs@ietf.org</a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] 2nd WG LC on draft-ietf-mpls-b=
fd-directed<u></u><u></u></span></div>
</div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Hi, Greg,<span>=C2=A0</span><u></u><u></u></div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I think we got to the source of the technical disagreement. Please find som=
e closing comments inline.<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
On Aug 16, 2016, at 12:22 PM, Gregory Mirsky &lt;<a href=3D"mailto:gregory.=
mirsky@ericsson.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank">gregory.mirsky@ericsson.com</a>&gt; wrote:<u></u><u></u></div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Hi Carlos,</s=
pan><u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">thank you for=
 clarification of your concerns. Please find my notes in-line and tagged GI=
M3&gt;&gt;.</span><u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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 Regards,</span><u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0<wbr>=C2=A0 Greg</span><u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><span style=3D"font-size:11pt;font-family:calibri,sans-serif">From:</spa=
n></b><span><span style=3D"font-size:11pt;font-family:calibri,sans-serif">=
=C2=A0</span></span><span style=3D"font-size:11pt;font-family:calibri,sans-=
serif">Carlos
 Pignataro (cpignata) [<a href=3D"mailto:cpignata@cisco.com" style=3D"color=
:purple;text-decoration:underline" target=3D"_blank"><span style=3D"color:p=
urple">mailto:cpignata@cisco.com</span></a>]<span>=C2=A0</span><br>
<b>Sent:</b><span>=C2=A0</span>Tuesday, August 16, 2016 6:14 AM<br>
<b>To:</b><span>=C2=A0</span>Gregory Mirsky &lt;<a href=3D"mailto:gregory.m=
irsky@ericsson.com" style=3D"color:purple;text-decoration:underline" target=
=3D"_blank"><span style=3D"color:purple">gregory.mirsky@ericsson.com</span>=
</a>&gt;<br>
<b>Cc:</b><span>=C2=A0</span>Martin Vigoureux &lt;<a href=3D"mailto:martin.=
vigoureux@nokia.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank"><span style=3D"color:purple">martin.vigoureux@nokia.com</span>=
</a>&gt;;
 mpls &lt;<a href=3D"mailto:mpls@ietf.org" style=3D"color:purple;text-decor=
ation:underline" target=3D"_blank"><span style=3D"color:purple">mpls@ietf.o=
rg</span></a>&gt;;<span>=C2=A0</span><a href=3D"mailto:spring-chairs@ietf.o=
rg" style=3D"color:purple;text-decoration:underline" target=3D"_blank"><spa=
n style=3D"color:purple">spring-chairs<wbr>@ietf.org</span></a>;<span>=C2=
=A0</span><a href=3D"mailto:bfd-chairs@ietf.org" style=3D"color:purple;text=
-decoration:underline" target=3D"_blank"><span style=3D"color:purple">bfd-c=
hairs@ietf.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] 2nd WG LC on draft-ietf-mpls-b=
fd-directed</span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Hi, Greg,<span>=C2=A0</span><u></u><u></u></div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thank you for the follow-ups. Let me explain a couple of the key concerns t=
op-posting, with more responses inline.<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
One of the main technical concerns that I have is that segment routing bein=
g a loosely source-routed paradigm, there may not even be a bidirectional c=
o-routed path.<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM3&gt;&gt; =
I don=E2=80=99t think that your characterization of the Segment Routing as =
mandating use only loosely source-routed paths is entirely accurate. As in =
RSVP-TE, source-routed paths may be
 loosely or strictly source-routed. Excluding option to construct strictly =
source-routed paths, in my opinion, would significantly limit scope of the =
Source Routing technology.</span><u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Take the extreme case of a stack in the forward direction with a single Nod=
e SID, PE to PE, and shortest path in-between. Or the case of Parallel Link=
 SIDs with varied weights in different links. How are you providing a retur=
n path?<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM3&gt;&gt; Authors do not claim that the proposed solution applies to all=
 scenarios there could be in source routing. I think that has been already =
clarified in the text and in our discussion.<u></u><u></u></div>
</div>
</div>
</div>
</blockquote>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Conversely, this potentially seems to apply to a grossly small and limited =
set of scenarios, if any, yet those scenarios are not discussed in the docu=
ment, and are not defined to my knowledge in any SPRING document =E2=80=94 =
other than a mention in RFC 7855 of:<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0It is obvious that, in the case of long, strict source-routed =
paths,<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0the deployment is possible if the head-end of the explicit pat=
h<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0supports the instantiation of long explicit paths.<u></u><u></=
u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
which seems to refer to Node strictness and not necessarily Link strictness=
, and there is nothing in=C2=A0draft-ietf-spring-segment-r<wbr>outing-09.<u=
></u><u></u></div>
</div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<u></u><u></u></div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Can you please point to a definition of a co-routed path for Segment Routin=
g from the segment routing architectural documents?<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM3&gt;&gt; =
The proposal does not use bi-directional co-routed Segment Routed tunnels a=
s such construct doesn=E2=80=99t yet exists (though in earlier discussions =
there was some interest in investigating
 use case for it). On the other hand, definition of co-routedness can be fo=
und in MPLS-TP as =E2=80=9Cco-routed, meaning both directions follow the sa=
me path, i.e. traversing the same set of nodes and links=E2=80=9D.</span><u=
></u><u></u></div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
There=E2=80=99s no mention of MPLS-TP or SPRING-TP in SPRING docs either th=
at I could find.<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
If a SPRING stack includes a long set of Node SIDs, each one for each hop, =
still multiple-links between nodes are not specified and therefore it is no=
t clear how to provide the exact return path (when the link taken is unknow=
n). If the problem space is limited
 to the case in which for each hop, both Node SID and Adj SID are included,=
 no Anycast, no Parallel Link SID, etc., then practicality seems to get in =
the way.<u></u><u></u></div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<u></u><u></u></div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The second main concerns has to do with the proposed use of Labels (which c=
an change) instead of FECs (like RFC 7110).<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM3&gt;&gt; =
Authors believe that this is workable solution and the return path for the =
BFD session identified by BFD Discriminator TLV may be re-signaled without =
affecting state of the session.</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</blockquote>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
There could perhaps be a use of specifying a return path in this case. Howe=
ver, I believe the use is not the scenario targeted, and it is not specifyi=
ng data plane labels numerically.<u></u><u></u></div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<u></u><u></u></div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
These two seem to be major technical obstacles to the draft.<u></u><u></u><=
/div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</blockquote>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Please note there were some additional comments inline, but centered around=
 the same set of topics.<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thanks,<u></u><u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=E2=80=94 Carlos.<u></u><u></u></div>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<u></u><u></u></div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
On Aug 10, 2016, at 3:34 PM, Gregory Mirsky &lt;<a href=3D"mailto:gregory.m=
irsky@ericsson.com" style=3D"color:purple;text-decoration:underline" target=
=3D"_blank"><span style=3D"color:purple">gregory.mirsky@ericsson.com</span>=
</a>&gt; wrote:<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Hi Carlos,</s=
pan><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">thank you for=
 your comments. I hope I understand your concerns better and am able to add=
ress them. Please find my follow up notes in-line tagged GIM2&gt;&gt;.</spa=
n><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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 Regards,</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0<wbr>=C2=A0 Greg</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><span style=3D"font-size:11pt;font-family:calibri,sans-serif">From:</spa=
n></b><span><span style=3D"font-size:11pt;font-family:calibri,sans-serif">=
=C2=A0</span></span><span style=3D"font-size:11pt;font-family:calibri,sans-=
serif">Carlos
 Pignataro (cpignata) [<a href=3D"mailto:cpignata@cisco.com" style=3D"color=
:purple;text-decoration:underline" target=3D"_blank"><span style=3D"color:p=
urple">mailto:cpignata@cisco.com</span></a>]<span>=C2=A0</span><br>
<b>Sent:</b><span>=C2=A0</span>Tuesday, August 09, 2016 9:14 PM<br>
<b>To:</b><span>=C2=A0</span>Gregory Mirsky &lt;<a href=3D"mailto:gregory.m=
irsky@ericsson.com" style=3D"color:purple;text-decoration:underline" target=
=3D"_blank"><span style=3D"color:purple">gregory.mirsky@ericsson.com</span>=
</a>&gt;<br>
<b>Cc:</b><span>=C2=A0</span>Martin Vigoureux &lt;<a href=3D"mailto:martin.=
vigoureux@nokia.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank"><span style=3D"color:purple">martin.vigoureux@nokia.com</span>=
</a>&gt;;
 mpls &lt;<a href=3D"mailto:mpls@ietf.org" style=3D"color:purple;text-decor=
ation:underline" target=3D"_blank"><span style=3D"color:purple">mpls@ietf.o=
rg</span></a>&gt;;<span>=C2=A0</span><a href=3D"mailto:spring-chairs@ietf.o=
rg" style=3D"color:purple;text-decoration:underline" target=3D"_blank"><spa=
n style=3D"color:purple">spring-chairs<wbr>@ietf.org</span></a>;<span>=C2=
=A0</span><a href=3D"mailto:bfd-chairs@ietf.org" style=3D"color:purple;text=
-decoration:underline" target=3D"_blank"><span style=3D"color:purple">bfd-c=
hairs@ietf.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] 2nd WG LC on draft-ietf-mpls-b=
fd-directed</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Hi Greg,<span>=C2=A0</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thanks for the response =E2=80=94 please find some follow-ups inline.<u></u=
><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
On Jul 25, 2016, at 5:06 PM, Gregory Mirsky &lt;<a href=3D"mailto:gregory.m=
irsky@ericsson.com" style=3D"color:purple;text-decoration:underline" target=
=3D"_blank"><span style=3D"color:purple">gregory.mirsky@ericsson.com</span>=
</a>&gt; wrote:<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Hi Carlos,</s=
pan><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">thank you for=
 your comments. Please see my responses in-line and tagged GIM&gt;&gt;.</sp=
an><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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 Regards,</span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0<wbr>=C2=A0 Greg</span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><span style=3D"font-size:11pt;font-family:calibri,sans-serif">From:</spa=
n></b><span><span style=3D"font-size:11pt;font-family:calibri,sans-serif">=
=C2=A0</span></span><span style=3D"font-size:11pt;font-family:calibri,sans-=
serif">mpls
 [<a href=3D"mailto:mpls-bounces@ietf.org" style=3D"color:purple;text-decor=
ation:underline" target=3D"_blank"><span style=3D"color:purple">mailto:mpls=
-bounces@ietf.org</span></a>]<span><wbr>=C2=A0</span><b>On Behalf Of<span>=
=C2=A0</span></b>Carlos
 Pignataro (cpignata)<br>
<b>Sent:</b><span>=C2=A0</span>Saturday, July 16, 2016 8:35 AM<br>
<b>To:</b><span>=C2=A0</span>Martin Vigoureux &lt;<a href=3D"mailto:martin.=
vigoureux@nokia.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank"><span style=3D"color:purple">martin.vigoureux@nokia.com</span>=
</a>&gt;<br>
<b>Cc:</b><span>=C2=A0</span>mpls &lt;<a href=3D"mailto:mpls@ietf.org" styl=
e=3D"color:purple;text-decoration:underline" target=3D"_blank"><span style=
=3D"color:purple">mpls@ietf.org</span></a>&gt;;<span>=C2=A0</span><a href=
=3D"mailto:spring-chairs@ietf.org" style=3D"color:purple;text-decoration:un=
derline" target=3D"_blank"><span style=3D"color:purple">spring-chairs<wbr>@=
ietf.org</span></a>;<span>=C2=A0</span><a href=3D"mailto:bfd-chairs@ietf.or=
g" style=3D"color:purple;text-decoration:underline" target=3D"_blank"><span=
 style=3D"color:purple">bfd-chairs@ietf.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] 2nd WG LC on draft-ietf-mpls-b=
fd-directed</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Hi, Martin,<span>=C2=A0</span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Admittedly, I had not read or followed this document before. However, I jus=
t scanned through it, and I Have at best some fundamental questions and lik=
ely some major issues and concerns. I wonder also if you need to Cc the BFD=
 WG, copying the chairs on this
 response. Copying also SPRING chairs for awareness.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I hope these are useful to this WGLC.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><u>Major Concerns:</u></b><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
As I said, I just glanced through the document, and found these issues, que=
stions, or problems.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><u>1. Motivation for the work.</u></b><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Uni or bi-directional? The document starts with a fallacy, setting the tone=
 for the document, on the very first sentence:<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>Abstract</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0Bidirectional Forwarding Detection (BFD) is expected to mon=
itor bi-</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0directional paths.</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
This is absolutely not the case, as explained in RFC 5880 Section 2, RFC 58=
83 Section 4.3 (<a href=3D"https://tools.ietf.org/html/rfc5883#section-4.3"=
 style=3D"color:purple;text-decoration:underline" target=3D"_blank"><span s=
tyle=3D"color:purple">https://tools.ietf.org/html/r<wbr>fc5883#section-4.3<=
/span></a>),
 and many other places.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; I=
 think that you refer to the following text in RFC 5880:</span><u></u><u></=
u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Not specifically, not only.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
My point is that the very first sentence contradicts standards tracks BFD R=
FCs. BFD also is expected to monitor unidirectional paths.<u></u><u></u></d=
iv>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
GIM2&gt;&gt; Would the following change address your concern:<u></u><u></u>=
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">OLD</span><u>=
</u><u></u></div>
</div>
</div>
<div style=3D"margin-left:0.5in">
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Bidirectional=
 Forwarding Detection (BFD) is expected to monitor bi- directional paths. W=
hen a BFD session monitors an explicit routed =C2=A0=C2=A0=C2=A0path there =
is a need to be able to direct egress
 BFD peer to use specific path for the reverse direction of the BFD session=
.</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">NEW</span><u>=
</u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">Bidirectional=
 Forwarding Detection (BFD) is expected to monitor any kind of paths betwee=
n systems. When a BFD session monitors an explicitly routed uni-directional=
 path there may be a
 need to direct egress BFD peer to use specific path for the reverse direct=
ion of the BFD session.</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Since segment routing uses a loose source-routing paradigm, there may not b=
e explicitly routed or a reverse direction.<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0 =
BFD can provide failure detection on any kind of path between</span><u></u>=
<u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0 =
systems, including direct physical links, virtual circuits, tunnels,</span>=
<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0 =
MPLS Label Switched Paths (LSPs), multihop routed paths, and</span><u></u><=
u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0 =
unidirectional links (so long as there is some return path, of</span><u></u=
><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0=C2=A0 =
course).</span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">And this is e=
xactly what motivated the work we=E2=80=99re discussing. Consider the situa=
tion when the return path, though temporarily, is not available. Consider s=
cenario when node A sends BFD
 control packets over an LSP to node B and the node B sends its BFD packets=
 over out of band return path, e.g. IP network.=C2=A0 If the loss of contin=
uity between B and A lasts long enough to will detect failure. Should such =
failure be interpreted as indication
 of the failure on the monitored LSP or not?<span>=C2=A0</span></span><u></=
u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
But this is irrespective of wether the return path is explicit or not, or e=
ven if the return path is via some out of band channel. A different way, th=
is is also the case for BFD multihop over plain IP (on a tunnel one way, ho=
p-by-hop routed on the return).<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM2&gt;&gt; =
True, but we=E2=80=99re not solving these other scenarios, only those where=
 monitored path is explicitly routed. We can add explicit statement listing=
 out of the scope scenarios.</span><u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
See above.<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">The second pa=
ragraph in the Introduction section explains the scenario when an explicitl=
y routed LSP being monitored while the return path is over IP network that =
is based the shortest
 path paradigm.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The fact that the return path goes over the same links as the forward path =
does not mean that the return path is misprogrammed but the forward path is=
 correctly programmed.<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM2&gt;&gt; =
The purpose of making BFD session use co-routed path is not to verify how i=
t is instantiated in LFIB on a LSR. That is the task for defect localizatio=
n, not defect detection OAM.
 Would you agree?<span>=C2=A0</span></span><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I still believe that the motivation and use case is not well defined or exp=
lained.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
GIM2&gt;&gt; I=E2=80=99ll keep trying.<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The sentence that follows says:<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0When a BFD session monitors an explicit routed</i><u></u><u=
></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0path there is a need to be able to direct egress BFD peer t=
o use</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0specific path for the reverse direction of the BFD session.=
</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The question is =E2=80=94 why is there that need?<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM&gt;&gt; Please see my comment above.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I still believe this is a bit of a non sequitur. Why does BFD monitoring an=
 explicit routed path imply a need to direct the egress on a path for the r=
everse direction? That=E2=80=99s not generally a =E2=80=9Cneed=E2=80=9D in =
all situations.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin:0in 0in 12pt;font-size:12pt;font-fam=
ily:&quot;times new roman&quot;,serif">
GIM2&gt;&gt; Please see modified Abstract above. It uses =E2=80=9Cmay be a =
need=E2=80=9D<u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I think the passive voice hides precision needed.<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The document then goes on to say:<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>2.=C2=A0 Problem Statement</i><u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0BFD is best suited to monitor bi-directional co-routed path=
s.</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
But: First, why is this the case? the BFD specifications do not say so.<u><=
/u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; I=
f the paths used by forward and return paths are not co-routed that may cre=
ate ambiguous situation when interpreting failure detection on the node tha=
t sends BFD control packets
 onto the monitored path, e.g. LSP.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
First, the same ambiguity exists with bi-directional co-routed paths =E2=80=
=94 because links and nodes are not the only resources that need to be comm=
on. FIBs can be programmed well on one direction and wrongly on the reverse=
.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM2&gt;&gt; BFD, as other continuity check protocols, only performs defect=
 detection. Defect localization and characterization usually performed with=
 other tools. But having co-routed path for a test session reduces, not eli=
minates but reduces, ambiguity of defects
 of the reverse path.<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Can you please point to a definition of a co-routed path for Segment Routin=
g from the segment routing architectural documents?<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Or are you defining that here?<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Second, again, why =E2=80=9Cbest suited=E2=80=9D? If the BFD specs say that=
 BFD can monitor unidirectional paths (including MPLS LSPs and unidirection=
al links), seems BFD is not necessarily =E2=80=9Cbest suited to=E2=80=A6&qu=
ot;<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM2&gt;&gt; =
BFD certainly can and being used to monitor uni-directional paths. And usua=
lly we don=E2=80=99t think of how the reverse path may affect defect detect=
ion or, in case of PM OAM, measured
 performance metric. Having test session on bi-directional co-routed path m=
akes the test result interpretation more certain.</span><u></u><u></u></div=
>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
See above.<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
And: Second, if there is a co-routed bidirectional path, then there is no n=
eed to specify the return path! The return path is basically =E2=80=9Cback =
on the other way on this co-routed bidirectional path=E2=80=9D, so there is=
 no need for what this document specifies.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; A=
FAIK, only MPLS-TP defined p2p bi-directional co-routed LSP. True, co-route=
d bi-directional tunnel may be constructed by using combination of RSVP=E2=
=80=99s RRO and ERO as well. But other
 than that, AFAIK, all objects monitored by multi-hop BFD are not guarantee=
d to be co-routed.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
If the path *is*=C2=A0bi-directional co-routed (by whichever method), you w=
ould not need this =E2=80=94 the was my point, not that some cases are co-r=
outed and others are not.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM&gt;&gt; Yes, and the scope of this proposal is not on already bi-direct=
ional co-routed paths, e.g. MPLS-TP p2p bi-directional co-routed LSP. RSVP-=
TE LSP may be explicitly routed but are unidirectional. And so SR tunnel.<b=
r>
<br>
<br>
<br>
<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Next sentence:<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0be co-routed, thus</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0fulfilling the implicit BFD requirement</i><u></u><u></u></=
div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
But BFD never has this requirement, implicit or explicit.<u></u><u></u></di=
v>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; I=
f the goal of BFD to ensure reliable detection of failures, then co-routed =
multi-hop path is implied.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I disagree. Even RFC 5883 says:<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0The Bidirectional Forwarding Detection (BFD) protocol [BFD] de=
fines a<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0method for liveness detection of arbitrary paths between syste=
ms.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
and<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0BFD can also be useful on arbitrary paths between systems, whi=
ch may<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0span multiple network hops and follow unpredictable paths.<u><=
/u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
and<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0Furthermore, a pair of systems may have multiple paths between=
 them<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0that may overlap.=C2=A0 This document describes methods for us=
ing BFD in<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0 =C2=A0such scenarios.<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
GIM2&gt;&gt; Will remove =E2=80=9C=E2=80=A6 thus fulfilling the implicit BF=
D requirement=E2=80=9D from the document.<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I am not going to further dissect each sentence, but the point is that if t=
here=E2=80=99s something co-routed, there=E2=80=99s no need to explicitly p=
oint to the return path. If there is not, then why?<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; I=
f there=E2=80=99s no co-routedness between a monitored path and the return =
path, then this draft provides mechanism that may be used to remove possibl=
e ambiguity in interpretation of failure
 of the return path.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><u>2. Technical feasibility</u></b><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The second major problem area is the actual technical feasibility. A main m=
otivation seems to be =E2=80=9C3.1.3.=C2=A0 Segment Routing: MPLS Data Plan=
e Case=E2=80=9D.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
However, looking at an SR path, it can be constructed by Node-SIDs and Adj-=
SIDs. Please refer to:=C2=A0<a href=3D"https://tools.ietf.org/html/draft-ie=
tf-spring-segment-routing-07#section-3.5" style=3D"color:purple;text-decora=
tion:underline" target=3D"_blank"><span style=3D"color:purple">https://tool=
s.ietf.org/htm<wbr>l/draft-ietf-spring-segment-ro<wbr>uting-07#section-3.5<=
/span></a><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
First, Adj-SIDs SHOULD (not MUST) be assigned. This means there is the pote=
ntial of an Adj-SID not assigned to a local Adj. There=E2=80=99s of course =
also the cases in which Adj-SIDs can be assigned to bundles, to ECMP/UCMP g=
roups, etc.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The implication here is that there is a possibility that there is no way to=
 exactly explicitly construct a co-routed return path. For example, if the =
forward path is Node A -&gt; Link X -&gt; Node Z, then the return path need=
s to go to the node Z. Then it is a loose
 path (i.e., NOT co-routed) to the adjacent node to A through link X, and t=
hen that node needs to have an Adj-SID on the same link, which might not.<u=
></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; A=
ppreciate your detailed analysis of the Segment Routing use case. We didn=
=E2=80=99t spell it out in such details but will be glad to add applicabili=
ty clarification based on your comment.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I do not think it is about Applicability. Given the existence of Adj-SIDs, =
the question is about technical feasibility. What do you do in the example =
I detailed above? Seems like there are potential cases in which it is not p=
ossible to specify the actual return
 path desired.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
GIM2&gt;&gt; There are many scenarios where it is possible and useful to sp=
ecify strict explicit path for SR tunnel. To use strict or loose paths =E2=
=80=93 that we leave to the operator to decide. The proposal addresses real=
 scenario, though not all possible ones.<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The document does not seem to include this applicability. Still, can you pl=
ease point to a definition of a co-routed path for Segment Routing from the=
 segment routing architectural documents?<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
There seems to be a difference between strict explicit routing (RSVP-TE) an=
d this capability.<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><u>3. Actual Protocol Mechanics</u></b><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Section 3.1.1.=C2=A0 BFD Reverse Path TLV, uses =E2=80=9CTarget FEC sub-TLV=
=E2=80=9D to define the reverse path. This is consistent with the approach =
in RFC=C2=A07110.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
In fact, Section 3.1.2 uses the RFC 7110 sub-TLVs for =E2=80=9CStatic and R=
SVP-TE sub-TLVs=E2=80=9D.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
However, Section 3.1.3, which seems to be a key motivation (=E2=80=9C3.1.3.=
=C2=A0 Segment Routing: MPLS Data Plane Case=E2=80=9D), uses =E2=80=9CLabel=
 Entries=E2=80=9D to specify the Path!<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I believe this is a serious technical issue. Instead of using Label values,=
 it should use Target FEC Stacks (as with the few other cases above). Label=
s can change. With labels there is no validation possible that what distrib=
uted by a given label distribution
 protocol is what is meant in the data plane.=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; I=
 don=E2=80=99t see need to use Target FEC Stacks as the purpose of the BFD =
Reverse Path TLV not to verify mapping between the control and the data pla=
nes but to provide the remote BFD
 peer with pre-computed for the reverse path.<span>=C2=A0</span></span><u><=
/u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
It is not about verification of the control and data planes in the return p=
ath.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The reason why RFC 7110 uses FECs and not Labels is that the invariant is t=
he FEC, while the label numerical value can change. Seems like using labels=
 is less robust and more brittle.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
GIM2&gt;&gt; If label value changes, i.e. label withdrawn, then BFD return =
path for the BFD session may be re-signaled via LSP Ping with the same BFD =
discriminator.<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
In fact, Section 5.2 is trying to assign this for the Target FEC Stack:<u><=
/u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<i>=C2=A0 =C2=A0 | X (TBD2) | Segment Routing MPLS Tunnel sub-TLV | This do=
cument |</i><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
But that=E2=80=99s not a Target FEC! It=E2=80=99s a label value!<u></u><u><=
/u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
This should be done by also using the Target FEC Stack.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The Target FEC Stack for SR is defined at=C2=A0<a href=3D"https://tools.iet=
f.org/html/draft-ietf-mpls-spring-lsp-ping-00" style=3D"color:purple;text-d=
ecoration:underline" target=3D"_blank"><span style=3D"color:purple">https:/=
/tools.ietf.org/html<wbr>/draft-ietf-mpls-spring-lsp-pi<wbr>ng-00</span></a=
>,
 but surprisingly, draft-ietf-mpls-spring-lsp-pin<wbr>g (and the SR TFC the=
reby defined) are not even references in this document.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; W=
e haven=E2=80=99t updated the draft just because I-D.kumarkini-mpls-spring-=
lsp-<wbr>ping got adopted by the WG. Will certainly update the reference in=
 the next version.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">=C2=A0</span>=
<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Section 3.3 of this document does include an older version of that draft, b=
efore WG adoption, and is somehow trying to Update it. Instead of updating =
it from here, it should discuss how to updated it on itself.<u></u><u></u><=
/div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<span style=3D"font-size:11pt;font-family:calibri,sans-serif">GIM&gt;&gt; T=
his document enhances LSP Ping for Segment Routing environment and we=E2=80=
=99ve proposed clarification to use of LSP Ping in Segment Routing when boo=
tstrapping BFD session that, hopefully,
 will be discussed by MPLS WG in course of this WGLC and used in draft-ietf=
-mpls-spring-lsp.</span><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
As an aside, it=E2=80=99s not clear to me why WGLCing this document (twice)=
 before moving forward with=C2=A0I-D.kumarkini-mpls-spring<wbr>-lsp-ping.<u=
></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
draft-ietf-mpls-spring-lsp-pin<wbr>g-00 seems to be a dependency to advance=
 before this.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
I still do not understand the technical reason to use MPLS labels and not F=
ECs. Further, using labels can suffer from misdirection if Label assignment=
 changes (for a stable given FEC)<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM2&gt;&gt; Return path may be re-signaled in such case.<br>
<br>
<br>
<br>
<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The Section that follows is: =E2=80=9C3.2.=C2=A0 Segment Routing: IPv6 Data=
 Plane Case=E2=80=9D, but in this case, I am mostly confused and baffled on=
 how a set of IPv6 addresses can be an MPLS Target FEC Stack.<u></u><u></u>=
</div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
GIM&gt;&gt; Agree, IPv6 case is outside the MPLS WG and I=E2=80=99ll remove=
 it for further study.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
OK.<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
The issue about using labels (along with the other ones) still remain.<u></=
u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<br>
<u></u><u></u></div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<b><u>4. IPR</u></b><u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
This document has IPR with specific licensing terms. I would like to unders=
tand what parts of the document are potentially covered and understand if t=
here=E2=80=99s ways to work around that.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
In summary, browsing through the document, I see high-level problem area is=
sues, feasibility issues, technology issues, and others. Happy to be shown =
incorrect if I missed or confused anything.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thanks!<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Carlos.<u></u><u></u></div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thanks,<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=E2=80=94 Carlos.<u></u><u></u></div>
</div>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<br>
<br>
<br>
<u></u><u></u></div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
Thanks,<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=E2=80=94 Carlos.<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
On Jul 10, 2016, at 1:59 PM, Martin Vigoureux &lt;<a href=3D"mailto:martin.=
vigoureux@nokia.com" style=3D"color:purple;text-decoration:underline" targe=
t=3D"_blank"><span style=3D"color:purple">martin.vigoureux@nokia.com</span>=
</a>&gt; wrote:<u></u><u></u></div>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
<div>
<div>
<div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
WG,<br>
<br>
as said by Ross [1], I have been appointed Document Shepherd for draft-ietf=
-mpls-bfd-directed [2]. As such I am also running the second WG LC.<br>
<br>
So, this e-mail starts a WG LC which will end on the 31st of July.<br>
<br>
I&#39;d like to remind that an IPR disclosure [3] exists against this docum=
ent.<br>
<br>
So it is time to state whether or not you are in favour of progressing the =
document. Please also take the time to review the document and post comment=
s on its content.<br>
<br>
Please respond to this call.<br>
<br>
Thank you<br>
<br>
Martin<br>
<br>
<br>
[1]:<span>=C2=A0</span><a href=3D"https://mailarchive.ietf.org/arch/msg/mpl=
s/rxnEv4LnUiwhTiZOhowOC6AcHYU" style=3D"color:purple;text-decoration:underl=
ine" target=3D"_blank"><span style=3D"color:purple">https://mailarchive.iet=
f.<wbr>org/arch/msg/mpls/rxnEv4LnUiwh<wbr>TiZOhowOC6AcHYU</span></a><br>
[2]:<span>=C2=A0</span><a href=3D"https://datatracker.ietf.org/doc/draft-ie=
tf-mpls-bfd-directed/" style=3D"color:purple;text-decoration:underline" tar=
get=3D"_blank"><span style=3D"color:purple">https://datatracker.ietf.<wbr>o=
rg/doc/draft-ietf-mpls-bfd-di<wbr>rected/</span></a><br>
[2]:<span>=C2=A0</span><a href=3D"https://datatracker.ietf.org/ipr/2769/" s=
tyle=3D"color:purple;text-decoration:underline" target=3D"_blank"><span sty=
le=3D"color:purple">https://datatracker.ietf.<wbr>org/ipr/2769/</span></a><=
br>
<br>
______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" style=3D"color:purple;text-decoration:unde=
rline" target=3D"_blank"><span style=3D"color:purple">mpls@ietf.org</span><=
/a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color:purpl=
e;text-decoration:underline" target=3D"_blank"><span style=3D"color:purple"=
>https://www.ietf.org/mailman/l<wbr>istinfo/mpls</span></a><u></u><u></u></=
div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
=C2=A0<u></u><u></u></div>
</div>
</div>
</blockquote>
</div>
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;time=
s new roman&quot;,serif">
<u></u>=C2=A0<u></u></div>
</div>
</div>
<span>&lt;Mail Attachment.eml&gt;</span></div>
</blockquote>
</div>
<br>
</div>
</div>
<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></block=
quote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</div>
</span>
</div>

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

--001a11c1591cbebc9b0547df59f5--


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Subject: [mpls] Fwd: [spring] WG Last Call for draft-ietf-spring-segment-routing-ldp-interop-05
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WG,

apologies, I should have sent this yesterday.
Please be aware of the running WG LC in SPRING.
thanks
-m


-------- Message transféré --------
Sujet : [spring] WG Last Call for 
draft-ietf-spring-segment-routing-ldp-interop-05
Date : Mon, 6 Feb 2017 14:20:42 +0100
De : Martin Vigoureux <martin.vigoureux@nokia.com>
Pour : spring@ietf.org
Copie à : draft-ietf-spring-segment-routing-ldp-interop@ietf.org

Hello Working Group,

This email starts a 2-week Working Group Last Call on 
draft-ietf-spring-segment-routing-ldp-interop-05 [1].

¤ Please read the document if you haven't read the most recent
version yet, and send your comments to the list, no later than the
*19th of February*.
Note that this is *not only* a call for comments on the document; it is 
also a call for support (or not) to publish this document as a Proposed 
Standard RFC.

¤ We have already polled for IPR knowledge on this document and all 
Authors have replied.
IPR exists against this document and has been disclosed [2].

Thank you

M&B

---
[1] 
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/
[2] 
https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-spring-segment-routing-ldp-interop

_______________________________________________
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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
Thread-Topic: [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-06
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Subject: Re: [mpls] [spring] WG Last Call for draft-ietf-spring-segment-routing-mpls-06
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Stewart,

I applied some of your comments in the new submitted version of the draft. =
Some other comments below.


> On Feb 2, 2017, at 1:15 PM, Stewart Bryant <stewart.bryant@gmail.com> wro=
te:
>=20
> Here are a number of WGLC comments on this document.
>=20
> - Stewart
>=20
>                  Segment Routing with MPLS data plane
>               draft-ietf-spring-segment-routing-mpls-06
>=20
> Abstract
>=20
>   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.
>=20
> SB> This is SR MPLS. The above text implies a special header. Surely
> SB> it appends a stack of MPLS label stack entries that encode the instru=
ctions
> SB> as label values.


the first statement is the generic description of SR as an architecture. Th=
en, I will add a statement regarding the incarnation of the SR header in th=
e mpls dataplane (i.e.: a label stack).


>=20
>   A segment can
>   represent any instruction, topological or service-based.
> SB> and more!
>   SR allows
>   to enforce a flow through any topological path and service chain
>   while maintaining per-flow state only at the ingress node to the SR
>   domain.
>=20
> SB> The above does not read well.
> SB> Surely something like:
> SB> SR allows an ingress node to steer a packet through a
> SB> topological path specifying which service actions or other
> SB> operations need to executed on arrival as a each specified node.


the above is confusing because it implies the two are merged.

paths can be topological, service-based or both.


>   Segment Routing can be directly applied to the MPLS architecture with
>   no change in the forwarding plane.  This drafts describes how Segment
>   Routing operates on top of the MPLS data plane.
>=20
> =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
>=20
>=20
> 2.  Illustration
>=20
>   Segment Routing, applied to the MPLS data plane, offers the ability
>   to tunnel services (VPN, VPLS, VPWS) from an ingress PE to an egress
>   PE, without any other protocol than ISIS or OSPF
>   ([I-D.ietf-isis-segment-routing-extensions] and
>   [I-D.ietf-ospf-segment-routing-extensions]).  LDP and RSVP-TE
>   signaling protocols are not required.
>=20
> SB> Strictly no protocol is required as we did in MPLS-TP.
> SB> What you are saying is that by embedding additional
> SB> information in the the link state igp in use, you remove the
> SB> dependence on LDP, and RSVP-TE, although of course RSVP-TE
> SB> does run-time bandwidth accounting which you have to move to
> SB> a central place.


the text has been already reviewed and commented multiple time and reflects=
 the agreement of the WG. We specify that SR doesn=92t need rsvp-te or ldp.=
=20

In the context of SR, we just don=92t need them. On other context they cert=
ainly have their value.


>=20
> SB> I suspect that the reader would be better served by putting the
> SB> rest of this after explaining how the protocol mapping works.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
>=20
>   Supporting MPLS services (VPN, VPLS, VPWS) with SR has the following
>   benefits:
>=20
>      Simple operation: one single intra-domain protocol to operate: the
>      IGP.  No need to support IGP synchronization extensions as
>      described in [RFC5443] and [RFC6138].
>=20
>      Excellent scaling: one Node-SID per PE.
>=20
> SB> Is this all it seems. If you are going to steer the packet
> SB> I think you need more than one node-SID to get the packet there.


not really. Please have a look at the architecture and illustrations.


> SB> I presume the point is (and it should be brought out) that with
> SB> liberal label retention you have a label per adjacency that maps
> SB> to the remote PE (in the RP), although only one is in the FIB. If you=
 have
> SB> an RSVP-TE path you have more than one label per PE, you have
> SB> one per constructed path, but in the FIB you only need to specify
> SB> a single label imposition, whilst in SR, you need to specify a
> SB> multi-label imposition.


this would trigger the neverending debate on whether we should start compar=
ing all aspects pros/cons of control planes (SR vs. ldp/rsvp).=20

We=92re just interested into how SR works: one sid per pe.


> SB> As I understand it different vendors have different approaches
> SB> to label aggregation which may further complicate the issue, but
> SB> this text needs to be neutral on that point.
>=20
>=20
> 3.  MPLS Instantiation of Segment Routing
>=20
>   MPLS instantiation of Segment Routing fits in the MPLS architecture
>   as defined in [RFC3031] both from a control plane and forwarding
>   plane perspective:
>=20
>   o  From a control plane perspective [RFC3031] does not mandate a
>      single signaling protocol.  Segment Routing proposes to use the
>      Link State IGP as its use of information flooding fits very well
>      with label stacking on ingress.
>=20
> SB> Surely you propose to be protocol agnostic? For example SR will work =
just as
> SB> well with for example a pub-sub approach.
>=20
>   o  From a forwarding plane perspective, Segment Routing does not
>      require any change to the forwarding plane.
>=20
>   When applied to MPLS, a Segment is a LSP and the 20 right-most bits
>   of the segment are encoded as a label. This implies that, in the
>   MPLS instantiation, the SID values are allocated within a reduced
>   20-bit space out of the 32-bit SID space.
>=20
> SB> That is a very strange way of saying that in MPLS SIDs are 20
> SB> bits, although of course they are often less than 20 bits
> SB> as other MPLS applications need to use the same label table.
> SB> If SIDs were 32 bits, then you would need to encode them across
> SB> multiple labels, which I have not seen proposed.


what exactly you don=92t find clear ?

a label value is 20 bits as per mpls architecture so we map a segment ident=
ifier into these bits.


>   The notion of indexed global segment fits the MPLS architecture
>   [RFC3031] as the absolute value allocated to any segment (global or
>   local) can be managed by a local allocation process (similarly to
>   other MPLS signaling protocols).
>=20
> SB> You need some text to introduce the above rather than pull it out
> SB> of a hat.


yes. Added reference to the architecture draft where indexes are introduced=
 and defined.


>   If present, SR can coexist and interworks with LDP and RSVP
>   [I-D.ietf-spring-segment-routing-ldp-interop].
>=20
>   The source routing model described in
>   [I-D.ietf-spring-segment-routing] is inherited from the ones proposed
>   by [RFC1940] and [RFC2460].  The source routing model offers the
>   support for explicit routing capability.
>=20
> SB> SR goes back prior to RFC791, which also included source routing.
>=20
>=20
>   Contrary to RSVP-based explicit routes where tunnel midpoints
>   maintain states, SR-based explicit routes only require per-flow
>   states at the ingress edge router where the traffic engineer policy
>   is applied.
>=20
> SB> What about bandwidth management?


clearly this is in the scope of RSVP.

With SR we assume controller based SR TE networks where resources (used/ava=
ilable) are reported to the management/controller system and programming of=
 paths done accordingly.

Again, it=92s out of scope of this draft.


>=20
>   Contrary to RSVP-based explicit routes which consist in non-ECMP
>   circuits (similar to ATM/FR), SR-based explicit routes can be built
>   as list of ECMP-aware node segments and hence ECMP-aware traffic
>   engineering is natively supported by SR.
>=20
> SB> You mean loose source routing, which is again an old concept.


we don=92t claim the invention of it. We just illustrate the benefit of it.


>   When Segment Routing is instantiated over the MPLS data plane the
>   following applies:
>=20
>   o  A list of segments is represented as a stack of labels.
>=20
> SB> The items in the stack are technically LSEs.
>=20
>   o  The active segment is the top label.
>=20
>   o  The CONTINUE operation is implemented as an MPLS swap operation.
>      The outgoing label value is computed as follows:
>=20
> SB> CONTINUE need a reference


yes, added.


>=20
>      *  When the same Segment Routing Global Block (SRGB, defined in
>         [I-D.ietf-spring-segment-routing] is used throughout the SR
>         domain, the outgoing label value is equal to the incoming label
>         value.
>=20
>      *  When different SRGBs are used, the outgoing label value is set
>         as: [SRGB(next_hop)+index].
>=20
> SB> This is a continue, so isn't it label =3D label + SRGB_base_next - SR=
GB_base_this?

> SB> The order can be the other way around by this never gives negative nu=
mbers.


and so ?


>         If the index can't be applied to
>         the SRGB (i.e.: if the index points outside the SRGB of the
>         next-hop or the next-hop has not advertised a valid SRGB), then
>         no outgoing label value can be computed and the next-hop MUST
>         be considered as not supporting the MPLS operations for that
>         particular SID.
>=20
> SB> Presumably you also need to take a management action since the
> SB> control plane should no allow the situation to occur.
>=20
>      *  The index and the SRGB may be learned through different means.
>         Obviously, the SRGB MUST be the one the index is related to.
>=20
> SB> The above is a little opaque.


I think it=92s clear but I can add a few words if it helps you: the SRGB ca=
n be learned through different means. However, it is obvious that the SRGB =
the index is applied to MUST be the one belonging to the neighbor intended =
to receive the packet.



>   o  The NEXT operation is implemented as an MPLS pop operation.  The
>      NEXT operation does not require any mapping to an outgoing label
>      hence the SRGB is irrelevant for this operation.
>=20
> SB> NEXT needs a reference
>=20
>   o  The PUSH operation is implemented as an MPLS push of a label
>      stack.
>=20
> SB> POP needs a reference, and don't you actually push one or more LSE?
>=20
>   o  The Segment Routing Global Block (SRGB) values MUST be greater
>      than 15 in order to preserve values 0-15 as defined in [RFC3032].
>=20
> SB> What you are saying is that the SRGB base value must have a number
> SB> greater than the top of the special purpose label space (0..15), alth=
ough
> SB> as it was expressed it looked like you wanted to have room for them
> SB> in the SR label space.


I think the text is clear, no ? it=92s not SR but rather the MPLS architect=
ure that requires to use label 16 upwards. SR complies to this.


> SB> Indeed I think the document set conflates SGRB with SRGB_base and
> SB> ought to define both terms.
>=20
> SB> I think it might be worth noting that the obvious implementation of
> SB> RFC7474 would be to move the ceiling of the SPLs rather than
> SB> creating a new table in h/w and thus it would be sensible leave
> SB> some space between 15 and SRGB-base.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
>=20
> 4.1.  Example 1
> ...
>=20
>   In conclusion, the path followed by P1 is R1-R2--R3-R8.  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.
>=20
>=20
>=20
> SB> Ah now how is that ECMP being calculated?


igp.


> If it is based on the
> SB> labels in a stack without an EL, isn't there a tendency to reduce
> SB> the entropy given the guideline to allocate the same SRGB everywhere?
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> 5.1.  LDP LSP segment combined with IGP segments
>=20
>   The example illustrates a segment-routing policy including IGP
>   segments and LDP LSP segments.
>=20
>                      SL1---S2---SL3---L4---SL5---S6
>                                  |               |
>                                  +---------------+
>=20
>           Figure 4: LDP LSP segment combined with IGP segments
>=20
> SB> This and the text that follows is very confusing. It would be helpful=
 to define your
> SB> SL, S, L notation up front.


please precise what is confusing to you.


>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
>=20
> 5.2.  RSVP-TE LSP segment combined with IGP segments
>=20
>   The example illustrates a segment-routing policy including IGP
>   segments and RSVP-TE LSP segments.
>=20
>                       S1---S2---RS3---R4---RS5---S6
>                                  |               |
>                                  +---------------+
>=20
>         Figure 5: RSVP-TE LSP segment combined with IGP segments
>=20
> SB> Again starting with the notation would be helpful to the reader.
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
>=20
>=20
>   In the MPLS instantiation, as the packet travels through the SR
>   domain, the stack is depleted and the segment list history is
>   gradually lost.
>=20
> SB> Strictly the history is not gradually lost, it is never there.
> SB> When you see a label stack, you know the future of the packet
> SB> but never the past.


removed =93history=94.



> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
>=20
> 8.  Manageability Considerations
>=20
>   This document describes the applicability of Segment Routing over the
>   MPLS data plane.  Segment Routing does not introduce any change in
>   the MPLS data plane.  Manageability considerations described in
>   [I-D.ietf-spring-segment-routing] applies to the MPLS data plane when
>   used with Segment Routing.
>=20
> SB> Maybe I missed it, but I could not see any discussion on the implicat=
ions
> SB> for LSP-ping. Does that just work out of the box or does it need chan=
ges?


LSP-ping is in the oam draft.

>=20
> 9.  Security Considerations
>=20
>   This document does not introduce additional security requirements and
>   mechanisms other than the ones described in
>   [I-D.ietf-spring-segment-routing].
>=20
> SB> I think that the MPLS element of the security considerations might be
> SB> better placed here with the rest of the MPLS text.
> SB> By minimising the range of the labels used, isn't path guessing more
> SB> of a concern, and isn't there a greater chance that a misforwarded pa=
cket
> SB> will get to a destination rather than be dropped?
> SB>
> SB> Doesn't SR make it a tad easier for the pervasive monitoring people
> SB> to figure out where a packet is going than in an LSP or RSVP-TE contr=
olled
> SB> network?


please read the arch draft and its security section.

thanks.
s.


>=20
>=20
>=20


From nobody Tue Feb  7 11:25:29 2017
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
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Subject: Re: [mpls] Routing directorate review of draft-ietf-mpls-app-aware-tldp
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--_000_D4BE0BF3E3C73sesalejunipernet_--


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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 Multiprotocol Label Switching of the IETF.

        Title           : Application-aware Targeted LDP
        Authors         : Santosh Esale
                          Raveendra Torvi
                          Luay Jalil
                          Uma Chunduri
                          Kamran Raza
	Filename        : draft-ietf-mpls-app-aware-tldp-07.txt
	Pages           : 17
	Date            : 2017-02-07

Abstract:
   Recent targeted LDP (tLDP) applications such as remote loop-free
   alternate (LFA) and BGP auto discovered pseudowire may automatically
   establish a tLDP session to any LSR in a network.  The initiating LSR
   has information about the targeted applications to administratively
   control initiation of the session. However, the responding LSR has no
   such information to control acceptance of this session. This document
   defines a mechanism to advertise and negotiate Targeted Applications
   Capability (TAC) during LDP session initialization.  As the
   responding LSR becomes aware of targeted applications, it may
   establish a limited number of tLDP sessions for certain applications.
   In addition, each targeted application is mapped to LDP Forwarding
   Equivalence Class (FEC) Elements to advertise only necessary LDP FEC-
   label bindings over the session. This document updates RFC 7473.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-app-aware-tldp/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-app-aware-tldp-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-app-aware-tldp-07


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/


From nobody Wed Feb  8 07:48:44 2017
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From: "Michel Gosse" <michelg@upperside.fr>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/F9MUs-ArEiGjFKf43BRFrEOk3G8>
Subject: [mpls] MPLS+SDN+NFV World 2017: from management to orchestration
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MANO with ETSI representatives, OpenECOMP with AT&T and industrial experts: 
the 19th Edition of MPLS + SDN + NFV World will demonstrate how the industry
evolves from management to orchestration.
 
Other sessions will cover EVPN, SD-WAN, SR, analytics, service assurance,
V6, SDN transport, SDN WAN and deployments.
 
More info.:   <http://www.uppersideconferences.com/mpls-sdn-nfv/>
http://www.uppersideconferences.com/mpls-sdn-nfv/
 

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<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Columns 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Grid 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Contemporary"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Elegant"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Professional"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Balloon Text"/>
<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Theme"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder =
Text"/>
<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" =
Name=3D"No Spacing"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful =
List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful =
Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" =
Name=3D"List Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" =
Name=3D"Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" =
Name=3D"Intense Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true" =
Name=3D"Subtle Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true" =
Name=3D"Intense Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true" =
Name=3D"Subtle Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true" =
Name=3D"Intense Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" =
Name=3D"Book Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"43" Name=3D"Plain Table =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"44" Name=3D"Plain Table =
4"/>
<w:LsdException Locked=3D"false" Priority=3D"45" Name=3D"Plain Table =
5"/>
<w:LsdException Locked=3D"false" Priority=3D"40" Name=3D"Grid Table =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 =
Dark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 =
Colorful"/>
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Light Accent 1"/>
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link=3D"#0563C1" vlink=3D"#954F72" style=3D'tab-interval:35.4pt'><div =
class=3DWordSection1><p class=3DMsoNormal><b =
style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-=
ansi-language:EN-US'>MANO</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-=
ansi-language:EN-US'> with <b =
style=3D'mso-bidi-font-weight:normal'>ETSI</b> representatives, <span =
class=3DSpellE><b =
style=3D'mso-bidi-font-weight:normal'>OpenECOMP</b></span> with <b =
style=3D'mso-bidi-font-weight:normal'>AT&amp;T </b>and industrial =
experts: <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-=
ansi-language:EN-US'>the 19th Edition of MPLS + SDN + NFV World will =
demonstrate how the industry evolves from management to =
orchestration.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-=
ansi-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;color:black;mso-=
ansi-language:EN-US'>Other sessions will cover EVPN, SD-WAN, SR, =
analytics, service assurance, V6, SDN transport, SDN WAN and =
deployments.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;mso-ansi-languag=
e:EN-US'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;mso-ansi-languag=
e:EN-US'>More info.<span style=3D'color:#1F497D'>: </span><span =
style=3D'mso-spacerun:yes'>&nbsp;</span></span><span =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif'><a =
href=3D"http://www.uppersideconferences.com/mpls-sdn-nfv/"><span =
lang=3DEN-US =
style=3D'mso-ansi-language:EN-US'>http://www.uppersideconferences.com/mpl=
s-sdn-nfv/</span></a></span><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Arial",sans-serif;mso-ansi-languag=
e:EN-US'><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ansi-langu=
age:EN-US;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p></div><=
/body></html>
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Subject: [mpls] MIB Dr. review of draft-ietf-mpls-mldp-mib-01
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--001a114147c8a29544054837dbe0
Content-Type: text/plain; charset=UTF-8

Hello Authors,

This draft has come a long way since the previous version.  Thanks for that.

Please make sure the MIB compiles with smilint prior to MIB review as it is
difficult to review a
MIB Module that doesn't compile.

Also, please add compliance statements and conformance groups.

Comments below.
Thanks,
-Joan


output from smilint compiler:
------------------------------
While processing your request the following errors and/or warnings have
been found:

mibs/MPLS-MLDP-STD-MIB:76: [5] {date-year-2digits} warning: date
specification `2016092600Z' contains a two-digit year representing `1920'
mibs/MPLS-MLDP-STD-MIB:76: [2] {date-month} date specification
`2016092600Z' contains an illegal month
mibs/MPLS-MLDP-STD-MIB:76: [2] {date-hour} date specification `2016092600Z'
contains an illegal hour
mibs/MPLS-MLDP-STD-MIB:76: [4] {date-in-past} warning: date specification
`2016092600Z' predates the SMI standard

Then after that was fixed, more errors:

mibs/MPLS-MLDP-STD-MIB:268: [2] {identifier-redefined} redefinition of
identifier `mplsLdpPeerCapabilityEntry'
mibs/MPLS-MLDP-STD-MIB:254: [6] {previous-definition} info: previous
definition of `mplsLdpPeerCapabilityEntry'
mibs/MPLS-MLDP-STD-MIB:268: [1] {internal-other} syntax error, unexpected
COLON_COLON_EQUAL, expecting OBJECT
mibs/MPLS-MLDP-STD-MIB:271: [5] {internal-flushing} warning: flushing
recent incorrect declaration, see previous error(s)
mibs/MPLS-MLDP-STD-MIB:279: [4] {hyphen-in-label} warning: named bit
`upstream-label-assignment' must not include a hyphen in SMIv2
mibs/MPLS-MLDP-STD-MIB:283: [4] {hyphen-in-label} warning: named bit
`prot-lsr' must not include a hyphen in SMIv2
mibs/MPLS-MLDP-STD-MIB:286: [4] {hyphen-in-label} warning: named bit
`node-prot' must not include a hyphen in SMIv2
mibs/MPLS-MLDP-STD-MIB:386: [1] {internal-other} syntax error, unexpected
UPPERCASE_IDENTIFIER, expecting COLON_COLON_EQUAL
mibs/MPLS-MLDP-STD-MIB:417: [5] {internal-flushing} warning: flushing
recent incorrect declaration, see previous error(s)
mibs/MPLS-MLDP-STD-MIB:482: [2] {description-missing} description missing
in object definition
mibs/MPLS-MLDP-STD-MIB:482: [1] {internal-other} syntax error, unexpected
MAX_ACCESS, expecting COLON_COLON_EQUAL
mibs/MPLS-MLDP-STD-MIB:493: [5] {internal-flushing} warning: flushing
recent incorrect declaration, see previous error(s)
mibs/MPLS-MLDP-STD-MIB:1060: [1] {internal-other} syntax error, unexpected
'}', expecting UPPERCASE_IDENTIFIER or LOWERCASE_IDENTIFIER or NUMBER
mibs/MPLS-MLDP-STD-MIB:1060: [5] {internal-flushing} warning: flushing
recent incorrect declaration, see previous error(s)
mibs/MPLS-MLDP-STD-MIB:1061: [1] {internal-other} syntax error, unexpected
STATUS



General Comments (please check throughout document)
---------------------------------------------------------------------------------
*) Need to get this to compile using smilint.


*) When other documents (RFCs or drafts) are mentioned, there should be a
reference notation given.  Please fix this throughout the draft.

*) Naming Conventions:  Please refer to RFC4181 (MIB guidelines).
Basically, the naming conventions used in this MIB Module do not follow
the recommended naming conventions (Appendix C).

Prefix should be used throughout for all objects/tables/entries etc.
So "mplsMldp" needs to be used consistently.


*) Think there are more AUGMENTS relationships between RFC3815 Tables and
Tables in this MIB Module
but they are not defined as AUGMENTS within the MIB Module but are
described as such within the
document sections.   Please make sure that the relationships between these
tables are clarified.
e.g.  mplsMldpPeerCapabilityTable and mplsLdpPeerTable


Section 2.

Remove the first paragraph.  Think this is understood.

   [[CREF1: The title and text for this section has been copied from the
   official boilerplate, and should not be modified unless the official
   boilerplate text from the OPS Area web site has changed.  See RFC4818
   section 3.1 for a discussion of the boilerplate section.]]


Section 4. Overview

*) Make sure the RFCs/drafts listed are referenced as being in the
References Section (probably the Normative References section).  Some of
them are, some of the are not.  Be consistent.

*) Not very helpful to list a bunch of documents and not specify which
features (i.e. specify the sections/sub-sections) appear in which
documents.
We already can see the list of documents in the References section so
unless features/sections/subsections from these docs are specified per
document, then don't see this as adding information.

*) Also, some out of date listings, so need to update these.
ietf-rtgwg-mofrr is an RFC as of 8/2015
ietf-mpls-mldp-node-protection is an RFC as of 1/2016

*) typo:  ...stats per per Interface


Section 6.2

   mplsMldpSessionStatsTable : This table contains the number of mLDP
   FECs received and advertised to particular LDP session.

s/to particular LDP session/ to a particular LDP session/


Section 7.

   There are ten scalars, listed below are defined for this MIB module.

*) above sentence is awkward.  Maybe something like:

The following scalars are defined in this MIB Module:


Section 8.1

*) s/from LDP peer/from an LDP peer/


Section 8.5

typo in section's title
s/Upstreaam/Upstream/


Section 8.6

s/gives the information/gives information/
s/about number/about the number of/  (2 occurrences)

s/received on particualr/received on a particular/

Please note:  will review the other sections once the MIB compiles and
compliance statements are added.


References Section:
*) Some references (drafts) out of date and RFCs are out of order
References.  Please update.

Other
*) Please remove Appendix A and Appendix B (and regenerate the Table of
Contents.)

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<div dir=3D"ltr">Hello Authors,<br><br>This draft has come a long way since=
 the previous version.=C2=A0 Thanks for that.<br><br>Please make sure the M=
IB compiles with smilint prior to MIB review as it is difficult to review a=
 <br>MIB Module that doesn&#39;t compile.<br><br>Also, please add complianc=
e statements and conformance groups.<br><br>Comments below.<br>Thanks,<br>-=
Joan<br><br><br>output from smilint compiler:<br>--------------------------=
----<br>While processing your request the following errors and/or warnings =
have been found:<br><br>mibs/MPLS-MLDP-STD-MIB:76: [5] {date-year-2digits} =
warning: date specification `2016092600Z&#39; contains a two-digit year rep=
resenting `1920&#39;<br>mibs/MPLS-MLDP-STD-MIB:76: [2] {date-month} date sp=
ecification `2016092600Z&#39; contains an illegal month<br>mibs/MPLS-MLDP-S=
TD-MIB:76: [2] {date-hour} date specification `2016092600Z&#39; contains an=
 illegal hour<br>mibs/MPLS-MLDP-STD-MIB:76: [4] {date-in-past} warning: dat=
e specification `2016092600Z&#39; predates the SMI standard<br><br>Then aft=
er that was fixed, more errors:<br><br>mibs/MPLS-MLDP-STD-MIB:268: [2] {ide=
ntifier-redefined} redefinition of identifier `mplsLdpPeerCapabilityEntry&#=
39;<br>mibs/MPLS-MLDP-STD-MIB:254: [6] {previous-definition} info: previous=
 definition of `mplsLdpPeerCapabilityEntry&#39;<br>mibs/MPLS-MLDP-STD-MIB:2=
68: [1] {internal-other} syntax error, unexpected COLON_COLON_EQUAL, expect=
ing OBJECT<br>mibs/MPLS-MLDP-STD-MIB:271: [5] {internal-flushing} warning: =
flushing recent incorrect declaration, see previous error(s)<br>mibs/MPLS-M=
LDP-STD-MIB:279: [4] {hyphen-in-label} warning: named bit `upstream-label-a=
ssignment&#39; must not include a hyphen in SMIv2<br>mibs/MPLS-MLDP-STD-MIB=
:283: [4] {hyphen-in-label} warning: named bit `prot-lsr&#39; must not incl=
ude a hyphen in SMIv2<br>mibs/MPLS-MLDP-STD-MIB:286: [4] {hyphen-in-label} =
warning: named bit `node-prot&#39; must not include a hyphen in SMIv2<br>mi=
bs/MPLS-MLDP-STD-MIB:386: [1] {internal-other} syntax error, unexpected UPP=
ERCASE_IDENTIFIER, expecting COLON_COLON_EQUAL<br>mibs/MPLS-MLDP-STD-MIB:41=
7: [5] {internal-flushing} warning: flushing recent incorrect declaration, =
see previous error(s)<br>mibs/MPLS-MLDP-STD-MIB:482: [2] {description-missi=
ng} description missing in object definition<br>mibs/MPLS-MLDP-STD-MIB:482:=
 [1] {internal-other} syntax error, unexpected MAX_ACCESS, expecting COLON_=
COLON_EQUAL<br>mibs/MPLS-MLDP-STD-MIB:493: [5] {internal-flushing} warning:=
 flushing recent incorrect declaration, see previous error(s)<br>mibs/MPLS-=
MLDP-STD-MIB:1060: [1] {internal-other} syntax error, unexpected &#39;}&#39=
;, expecting UPPERCASE_IDENTIFIER or LOWERCASE_IDENTIFIER or NUMBER<br>mibs=
/MPLS-MLDP-STD-MIB:1060: [5] {internal-flushing} warning: flushing recent i=
ncorrect declaration, see previous error(s)<br>mibs/MPLS-MLDP-STD-MIB:1061:=
 [1] {internal-other} syntax error, unexpected STATUS<br><br><br><br>Genera=
l Comments (please check throughout document)<br>--------------------------=
-------------------------------------------------------<br>*) Need to get t=
his to compile using smilint.<br><br><br>*) When other documents (RFCs or d=
rafts) are mentioned, there should be a reference notation given.=C2=A0 Ple=
ase fix this throughout the draft.<br><br>*) Naming Conventions:=C2=A0 Plea=
se refer to RFC4181 (MIB guidelines).<br>Basically, the naming conventions =
used in this MIB Module do not follow<br>the recommended naming conventions=
 (Appendix C).=C2=A0 <br><br>Prefix should be used throughout for all objec=
ts/tables/entries etc.=C2=A0=C2=A0 <br>So &quot;mplsMldp&quot; needs to be =
used consistently.<br><br><br>*) Think there are more AUGMENTS relationship=
s between RFC3815 Tables and Tables in this MIB Module<br>but they are not =
defined as AUGMENTS within the MIB Module but are described as such within =
the<br>document sections.=C2=A0=C2=A0 Please make sure that the relationshi=
ps between these tables are clarified.<br>e.g.=C2=A0 mplsMldpPeerCapability=
Table and mplsLdpPeerTable<br><br><br>Section 2.<br><br>Remove the first pa=
ragraph.=C2=A0 Think this is understood.<br><br>=C2=A0=C2=A0 [[CREF1: The t=
itle and text for this section has been copied from the<br>=C2=A0=C2=A0 off=
icial boilerplate, and should not be modified unless the official<br>=C2=A0=
=C2=A0 boilerplate text from the OPS Area web site has changed.=C2=A0 See R=
FC4818<br>=C2=A0=C2=A0 section 3.1 for a discussion of the boilerplate sect=
ion.]]<br><br><br>Section 4. Overview<br><br>*) Make sure the RFCs/drafts l=
isted are referenced as being in the References Section (probably the Norma=
tive References section).=C2=A0 Some of them are, some of the are not.=C2=
=A0 Be consistent.<br><br>*) Not very helpful to list a bunch of documents =
and not specify which features (i.e. specify the sections/sub-sections) app=
ear in which documents. <br>We already can see the list of documents in the=
 References section so unless features/sections/subsections from these docs=
 are specified per document, then don&#39;t see this as adding information.=
<br><br>*) Also, some out of date listings, so need to update these.<br>iet=
f-rtgwg-mofrr is an RFC as of 8/2015<br>ietf-mpls-mldp-node-protection is a=
n RFC as of 1/2016<br><br>*) typo:=C2=A0 ...stats per per Interface<br><br>=
<br>Section 6.2<br><br>=C2=A0=C2=A0 mplsMldpSessionStatsTable : This table =
contains the number of mLDP<br>=C2=A0=C2=A0 FECs received and advertised to=
 particular LDP session.<br><br>s/to particular LDP session/ to a particula=
r LDP session/<br><br><br>Section 7.<br><br>=C2=A0=C2=A0 There are ten scal=
ars, listed below are defined for this MIB module.<br><br>*) above sentence=
 is awkward.=C2=A0 Maybe something like:<br><br>The following scalars are d=
efined in this MIB Module:<br><br><br>Section 8.1<br><br>*) s/from LDP peer=
/from an LDP peer/<br><br><br>Section 8.5<br><br>typo in section&#39;s titl=
e<br>s/Upstreaam/Upstream/<br><br><br>Section 8.6<br><br>s/gives the inform=
ation/gives information/<br>s/about number/about the number of/=C2=A0 (2 oc=
currences)<br><br>s/received on particualr/received on a particular/ <br><b=
r>Please note:=C2=A0 will review the other sections once the MIB compiles a=
nd compliance statements are added.<br><br><br>References Section:<br>*) So=
me references (drafts) out of date and RFCs are out of order References.=C2=
=A0 Please update.<br><br>Other<br>*) Please remove Appendix A and Appendix=
 B (and regenerate the Table of Contents.)<br><br><br></div>

--001a114147c8a29544054837dbe0--


From nobody Sat Feb 11 00:26:22 2017
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To: "mpls@ietf.org" <mpls@ietf.org>
References: <881fae47-dfd0-1cfb-0287-4338a030195c@pi.nu>
From: Loa Andersson <loa@pi.nu>
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Date: Sat, 11 Feb 2017 16:26:08 +0800
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Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-spring-lsp-ping@ietf.org" <draft-ietf-mpls-spring-lsp-ping@ietf.org>, Nobo Akiya <noboakiya24@gmail.com>, "Nagendra Kumar Nainar \(naikumar\)" <naikumar@cisco.com>, hannes@juniper.net
Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Folks,

Unless I missed something there has been no responses to this!

/Loa

On 2017-02-04 11:54, Loa Andersson wrote:
> Working Group, authors,
>
> I had a quick look at  draft-ietf-mpls-spring-lsp-ping-02, I have a few
> small nits and questions for the authors.
>
> 1. FEC is a well know abbreviation in MPLS context, but it is not
> well-know in wider IETF context. It needs to be expanded at first
> occurrence.
>
> 2. We have early allocation for this document, can you place the
> following not in the IANA section in section 10.1.
>
> "Note to the RFC Editor (please remove before publication): IANA has
>  made early allocation for sub-type 34, 35 and 35. The early allocation
>  expires 2017-09-15."
>
> And then we create a "#Protocol" sub-registry in  "Multi-Protocol Label
> Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" We will
> need to define allocation policies and code point range. IMHO the policy
> should be "Standards Action" and the code range 0-255.
>
> And a last question, should BGP-LS be in that registry?
>
> /Loa

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Loa Andersson <loa@pi.nu>
Thread-Topic: nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Hi Loa, Carlos,=20

On 2/11/17, 8:29 AM, "mpls on behalf of Carlos Pignataro (cpignata)"
<mpls-bounces@ietf.org on behalf of cpignata@cisco.com> wrote:

>Hi, Loa,
>
>> On Feb 3, 2017, at 10:54 PM, Loa Andersson <loa@pi.nu> wrote:
>>=20
>> Working Group, authors,
>>=20
>> I had a quick look at  draft-ietf-mpls-spring-lsp-ping-02, I have a few
>> small nits and questions for the authors.
>>=20
>> 1. FEC is a well know abbreviation in MPLS context, but it is not
>>well-know in wider IETF context. It needs to be expanded at first
>> occurrence.
>
>Agreed.
>
>>=20
>> 2. We have early allocation for this document, can you place the
>>following not in the IANA section in section 10.1.
>>=20
>> "Note to the RFC Editor (please remove before publication): IANA has
>> made early allocation for sub-type 34, 35 and 35. The early allocation
>> expires 2017-09-15.=B2
>
>OK.
>
>>=20
>> And then we create a "#Protocol" sub-registry in  "Multi-Protocol Label
>> Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" We will
>>need to define allocation policies and code point range. IMHO the policy
>> should be "Standards Action" and the code range 0-255.
>
>This is OK =8B I would also reserve a couple of values for Experiments.
>
>>=20
>> And a last question, should BGP-LS be in that registry?
>>=20
>
>I guess no until someone needs it?

BGP-LS has its own set of registries.

Border Gateway Protocol - Link State (BGP-LS) Parameters
    	=09
    	=09
    	=09
    		=09
    			BGP-LS NLRI-Types
<http://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#
nlri-types>
    		=09
    			RFC 7752 <http://www.iana.org/go/rfc7752>
		=09
    		=09
Specification Required (Expert: Unassigned)
    		=09
    	=09
    	=09
    	=09
    		=09
    			BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and
Attribute TLVs=20
<http://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#
node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv>
    		=09
    			RFC 7752 <http://www.iana.org/go/rfc7752>
		=09
    		=09
Specification Required (Expert: Unassigned)
    		=09
    	=09
    	=09
    	=09
    		=09
    			BGP-LS Protocol-IDs
<http://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#
protocol-ids>
    		=09
    			RFC 7752 <http://www.iana.org/go/rfc7752>
		=09
    		=09
Specification Required (Expert: Unassigned)
    		=09
    	=09
    	=09
    	=09
    		=09
    			BGP-LS Well-Known Instance-IDs
<http://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#
well-known-instance-ids>
    		=09
    			RFC 7752 <http://www.iana.org/go/rfc7752>
		=09
    		=09
Specification Required (Expert: Unassigned)


Thanks,
Acee =20




>
>Thanks,
>
>=8B Carlos.
>
>> /Loa
>> --=20
>>=20
>>=20
>> Loa Andersson                        email: loa@mail01.huawei.com
>> Senior MPLS Expert                          loa@pi.nu
>> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
>_______________________________________________
>mpls mailing list
>mpls@ietf.org
>https://www.ietf.org/mailman/listinfo/mpls


From nobody Sat Feb 11 10:29:44 2017
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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--_000_D713341EF21A4632BB1D0880FF36C9EFciscocom_
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Hi, Acee,

On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) <acee@cisco.com<mailto:ace=
e@cisco.com>> wrote:

And a last question, should BGP-LS be in that registry?


I guess no until someone needs it?

BGP-LS has its own set of registries.

Thanks. Yes. The question is whether to have a BGP-LS value for the MPLS LS=
P Ping DDMAP protocol: https://tools.ietf.org/html/draft-ietf-mpls-spring-l=
sp-ping-02#section-6

Thanks,

Carlos.

--_000_D713341EF21A4632BB1D0880FF36C9EFciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;" class=3D"">
Hi, Acee,<br class=3D"">
<br class=3D"">
<div>
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) &lt;<a hre=
f=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"">
<blockquote type=3D"cite" style=3D"font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-=
transform: none; white-space: normal; widows: auto; word-spacing: 0px; -web=
kit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=3D"">
<blockquote type=3D"cite" class=3D"">And a last question, should BGP-LS be =
in that registry?<br class=3D"">
<br class=3D"">
</blockquote>
<br class=3D"">
I guess no until someone needs it?<br class=3D"">
</blockquote>
<br style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; f=
ont-variant-caps: normal; font-weight: normal; letter-spacing: normal; orph=
ans: auto; text-align: start; text-indent: 0px; text-transform: none; white=
-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width:=
 0px;" class=3D"">
<span style=3D"font-family: Helvetica; font-size: 12px; font-style: normal;=
 font-variant-caps: normal; font-weight: normal; letter-spacing: normal; or=
phans: auto; text-align: start; text-indent: 0px; text-transform: none; whi=
te-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-widt=
h: 0px; float: none; display: inline !important;" class=3D"">BGP-LS
 has its own set of registries.</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight=
: normal; letter-spacing: normal; orphans: auto; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; widows: auto; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px;" class=3D"">
</div>
</div>
</blockquote>
</div>
<br class=3D"">
<div class=3D"">Thanks. Yes. The question is whether to have a BGP-LS value=
 for the MPLS LSP Ping DDMAP protocol:&nbsp;<a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-mpls-spring-lsp-ping-02#section-6" class=3D"">https://to=
ols.ietf.org/html/draft-ietf-mpls-spring-lsp-ping-02#section-6</a></div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Thanks,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Carlos.</div>
</body>
</html>

--_000_D713341EF21A4632BB1D0880FF36C9EFciscocom_--


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Hi Carlos,

I guess I commented without knowing the context of the comment ;^) See inli=
ne.

From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cis=
co.com>>
Date: Saturday, February 11, 2017 at 1:29 PM
To: Acee Lindem <acee@cisco.com<mailto:acee@cisco.com>>
Cc: Loa Andersson <loa@pi.nu<mailto:loa@pi.nu>>, "mpls@ietf.org<mailto:mpls=
@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.org>>, "mpls-chairs@ietf.org<ma=
ilto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.o=
rg>>, "draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:draft-ietf-mpls-spri=
ng-lsp-ping@ietf.org>" <draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:dra=
ft-ietf-mpls-spring-lsp-ping@ietf.org>>
Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02

Hi, Acee,

On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) <acee@cisco.com<mailto:ace=
e@cisco.com>> wrote:

And a last question, should BGP-LS be in that registry?


I guess no until someone needs it?

BGP-LS has its own set of registries.

Thanks. Yes. The question is whether to have a BGP-LS value for the MPLS LS=
P Ping DDMAP protocol: https://tools.ietf.org/html/draft-ietf-mpls-spring-l=
sp-ping-02#section-6

In that case, it might make sense to add a code point for BGP-LS since it i=
s the only way to advertise the SIDs (i.e, labels when MPLS SR is the data =
plane) for BGP EPE as described in https://www.ietf.org/id/draft-ietf-idr-b=
gp-prefix-sid-04.txt. However, one could argue that specifying BGP would su=
ffice since unless you are going to specify other BGP Address Families (AFI=
/SAFI tuples) as individual protocols.

Thanks,
Acee




Thanks,

Carlos.

--_000_D4C4C7FA9C253aceeciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hi Carlos,&nbsp;</div>
<div><br>
</div>
<div>I guess I commented without knowing the context of the comment ;^) See=
 inline.&nbsp;</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Carlos Pignataro (cpign=
ata)&quot; &lt;<a href=3D"mailto:cpignata@cisco.com">cpignata@cisco.com</a>=
&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Saturday, February 11, 2017 a=
t 1:29 PM<br>
<span style=3D"font-weight:bold">To: </span>Acee Lindem &lt;<a href=3D"mail=
to:acee@cisco.com">acee@cisco.com</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>Loa Andersson &lt;<a href=3D"ma=
ilto:loa@pi.nu">loa@pi.nu</a>&gt;, &quot;<a href=3D"mailto:mpls@ietf.org">m=
pls@ietf.org</a>&quot; &lt;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</=
a>&gt;, &quot;<a href=3D"mailto:mpls-chairs@ietf.org">mpls-chairs@ietf.org<=
/a>&quot;
 &lt;<a href=3D"mailto:mpls-chairs@ietf.org">mpls-chairs@ietf.org</a>&gt;, =
&quot;<a href=3D"mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org">draft-iet=
f-mpls-spring-lsp-ping@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-=
mpls-spring-lsp-ping@ietf.org">draft-ietf-mpls-spring-lsp-ping@ietf.org</a>=
&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [mpls] nits and questi=
on on draft-ietf-mpls-spring-lsp-ping-02<br>
</div>
<div><br>
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"">
Hi, Acee,<br class=3D"">
<br class=3D"">
<div>
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) &lt;<a hre=
f=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"">
<blockquote type=3D"cite" style=3D"font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-=
transform: none; white-space: normal; widows: auto; word-spacing: 0px; -web=
kit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=3D"">
<blockquote type=3D"cite" class=3D"">And a last question, should BGP-LS be =
in that registry?<br class=3D"">
<br class=3D"">
</blockquote>
<br class=3D"">
I guess no until someone needs it?<br class=3D"">
</blockquote>
<br style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; f=
ont-variant-caps: normal; font-weight: normal; letter-spacing: normal; orph=
ans: auto; text-align: start; text-indent: 0px; text-transform: none; white=
-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width:=
 0px;" class=3D"">
<span style=3D"font-family: Helvetica; font-size: 12px; font-style: normal;=
 font-variant-caps: normal; font-weight: normal; letter-spacing: normal; or=
phans: auto; text-align: start; text-indent: 0px; text-transform: none; whi=
te-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-widt=
h: 0px; float: none; display: inline !important;" class=3D"">BGP-LS
 has its own set of registries.</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight=
: normal; letter-spacing: normal; orphans: auto; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; widows: auto; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px;" class=3D"">
</div>
</div>
</blockquote>
</div>
<br class=3D"">
<div class=3D"">Thanks. Yes. The question is whether to have a BGP-LS value=
 for the MPLS LSP Ping DDMAP protocol:&nbsp;<a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-mpls-spring-lsp-ping-02#section-6" class=3D"">https://to=
ols.ietf.org/html/draft-ietf-mpls-spring-lsp-ping-02#section-6</a></div>
</div>
</div>
</blockquote>
</span>
<div><br>
</div>
<div>In that case, it might make sense to add a code point for BGP-LS since=
 it is the only way to advertise the SIDs (i.e, labels when MPLS SR is the =
data plane) for BGP EPE as described in&nbsp;<a href=3D"https://www.ietf.or=
g/id/draft-ietf-idr-bgp-prefix-sid-04.txt">https://www.ietf.org/id/draft-ie=
tf-idr-bgp-prefix-sid-04.txt</a>.
 However, one could argue that specifying BGP would suffice since unless yo=
u are going to specify other BGP Address Families (AFI/SAFI tuples) as indi=
vidual protocols.&nbsp;</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee&nbsp;</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"">
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Thanks,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Carlos.</div>
</div>
</div>
</blockquote>
</span>
</body>
</html>

--_000_D4C4C7FA9C253aceeciscocom_--


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Hi Carlos,

From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cis=
co.com>>
Date: Saturday, February 11, 2017 at 2:16 PM
To: Acee Lindem <acee@cisco.com<mailto:acee@cisco.com>>
Cc: Loa Andersson <loa@pi.nu<mailto:loa@pi.nu>>, "mpls@ietf.org<mailto:mpls=
@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.org>>, "mpls-chairs@ietf.org<ma=
ilto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.o=
rg>>, "draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:draft-ietf-mpls-spri=
ng-lsp-ping@ietf.org>" <draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:dra=
ft-ietf-mpls-spring-lsp-ping@ietf.org>>
Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02

Hi Acee,


On Feb 11, 2017, at 2:02 PM, Acee Lindem (acee) <acee@cisco.com<mailto:acee=
@cisco.com>> wrote:

Hi Carlos,

I guess I commented without knowing the context of the comment ;^) See inli=
ne.

From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cis=
co.com>>
Date: Saturday, February 11, 2017 at 1:29 PM
To: Acee Lindem <acee@cisco.com<mailto:acee@cisco.com>>
Cc: Loa Andersson <loa@pi.nu<mailto:loa@pi.nu>>, "mpls@ietf.org<mailto:mpls=
@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.org>>, "mpls-chairs@ietf.org<ma=
ilto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.o=
rg>>, "draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:draft-ietf-mpls-spri=
ng-lsp-ping@ietf.org>" <draft-ietf-mpls-spring-lsp-ping@ietf.org<mailto:dra=
ft-ietf-mpls-spring-lsp-ping@ietf.org>>
Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02

Hi, Acee,

On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) <acee@cisco.com<mailto:ace=
e@cisco.com>> wrote:

And a last question, should BGP-LS be in that registry?


I guess no until someone needs it?

BGP-LS has its own set of registries.

Thanks. Yes. The question is whether to have a BGP-LS value for the MPLS LS=
P Ping DDMAP protocol: https://tools.ietf.org/html/draft-ietf-mpls-spring-l=
sp-ping-02#section-6

In that case, it might make sense to add a code point for BGP-LS since it i=
s the only way to advertise the SIDs (i.e, labels when MPLS SR is the data =
plane) for BGP EPE as described in https://www.ietf.org/id/draft-ietf-idr-b=
gp-prefix-sid-04.txt. However, one could argue that specifying BGP would su=
ffice since unless you are going to specify other BGP Address Families (AFI=
/SAFI tuples) as individual protocols.


That's exactly the question - use the BGP protocol or define a new BGP-LS?

To me though, until someone sits down to do the BGP EPE LSP Ping analysis, =
we should not assume one way or another.

I'd vote to just use BGP rather than setting the precedent of a separate pr=
otocol ID for an AFI/SAFI - are we going to have a protocol ID for BGP L3VP=
N or BGP EVPN? I guess the question is, from an OAM perspective, how is the=
 DDMAP protocol going to be used?

Thanks,
Acee






Thanks,

Carlos.

Thanks,
Acee




Thanks,

Carlos.


--_000_D4C4F29D9C26Baceeciscocom_
Content-Type: text/html; charset="iso-8859-1"
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Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hi Carlos,&nbsp;</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Carlos Pignataro (cpign=
ata)&quot; &lt;<a href=3D"mailto:cpignata@cisco.com">cpignata@cisco.com</a>=
&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Saturday, February 11, 2017 a=
t 2:16 PM<br>
<span style=3D"font-weight:bold">To: </span>Acee Lindem &lt;<a href=3D"mail=
to:acee@cisco.com">acee@cisco.com</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>Loa Andersson &lt;<a href=3D"ma=
ilto:loa@pi.nu">loa@pi.nu</a>&gt;, &quot;<a href=3D"mailto:mpls@ietf.org">m=
pls@ietf.org</a>&quot; &lt;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</=
a>&gt;, &quot;<a href=3D"mailto:mpls-chairs@ietf.org">mpls-chairs@ietf.org<=
/a>&quot;
 &lt;<a href=3D"mailto:mpls-chairs@ietf.org">mpls-chairs@ietf.org</a>&gt;, =
&quot;<a href=3D"mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org">draft-iet=
f-mpls-spring-lsp-ping@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-=
mpls-spring-lsp-ping@ietf.org">draft-ietf-mpls-spring-lsp-ping@ietf.org</a>=
&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [mpls] nits and questi=
on on draft-ietf-mpls-spring-lsp-ping-02<br>
</div>
<div><br>
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"">
Hi Acee,
<div class=3D""><br class=3D"">
<br class=3D"">
<div>
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Feb 11, 2017, at 2:02 PM, Acee Lindem (acee) &lt;<a href=
=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; font-size: 14px; font-family: Calibri, sans-seri=
f;" class=3D"">
<div class=3D"">Hi Carlos,&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">I guess I commented without knowing the context of the comm=
ent ;^) See inline.&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
<span id=3D"OLK_SRC_BODY_SECTION" class=3D"">
<div style=3D"font-family: Calibri; font-size: 11pt; text-align: left; bord=
er-width: 1pt medium medium; border-style: solid none none; padding: 3pt 0i=
n 0in; border-top-color: rgb(181, 196, 223);" class=3D"">
<span style=3D"font-weight:bold" class=3D"">From: </span>&quot;Carlos Pigna=
taro (cpignata)&quot; &lt;<a href=3D"mailto:cpignata@cisco.com" class=3D"">=
cpignata@cisco.com</a>&gt;<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">Date: </span>Saturday, February=
 11, 2017 at 1:29 PM<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">To: </span>Acee Lindem &lt;<a h=
ref=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt;<br class=3D=
"">
<span style=3D"font-weight:bold" class=3D"">Cc: </span>Loa Andersson &lt;<a=
 href=3D"mailto:loa@pi.nu" class=3D"">loa@pi.nu</a>&gt;, &quot;<a href=3D"m=
ailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a>&quot; &lt;<a href=3D"mail=
to:mpls@ietf.org" class=3D"">mpls@ietf.org</a>&gt;, &quot;<a href=3D"mailto=
:mpls-chairs@ietf.org" class=3D"">mpls-chairs@ietf.org</a>&quot;
 &lt;<a href=3D"mailto:mpls-chairs@ietf.org" class=3D"">mpls-chairs@ietf.or=
g</a>&gt;, &quot;<a href=3D"mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org=
" class=3D"">draft-ietf-mpls-spring-lsp-ping@ietf.org</a>&quot; &lt;<a href=
=3D"mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org" class=3D"">draft-ietf-=
mpls-spring-lsp-ping@ietf.org</a>&gt;<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">Subject: </span>Re: [mpls] nits=
 and question on draft-ietf-mpls-spring-lsp-ping-02<br class=3D"">
</div>
<div class=3D""><br class=3D"">
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;" class=3D"">
<div class=3D"">
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"">
Hi, Acee,<br class=3D"">
<br class=3D"">
<div class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee) &lt;<a hre=
f=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"">
<blockquote type=3D"cite" style=3D"font-family: Helvetica; font-size: 12px;=
 font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-=
transform: none; white-space: normal; widows: auto; word-spacing: 0px; -web=
kit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=3D"">
<blockquote type=3D"cite" class=3D"">And a last question, should BGP-LS be =
in that registry?<br class=3D"">
<br class=3D"">
</blockquote>
<br class=3D"">
I guess no until someone needs it?<br class=3D"">
</blockquote>
<br style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; f=
ont-variant-caps: normal; font-weight: normal; letter-spacing: normal; orph=
ans: auto; text-align: start; text-indent: 0px; text-transform: none; white=
-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width:=
 0px;" class=3D"">
<span style=3D"font-family: Helvetica; font-size: 12px; font-style: normal;=
 font-variant-caps: normal; font-weight: normal; letter-spacing: normal; or=
phans: auto; text-align: start; text-indent: 0px; text-transform: none; whi=
te-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-widt=
h: 0px; float: none; display: inline !important;" class=3D"">BGP-LS
 has its own set of registries.</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight=
: normal; letter-spacing: normal; orphans: auto; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; widows: auto; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px;" class=3D"">
</div>
</div>
</blockquote>
</div>
<br class=3D"">
<div class=3D"">Thanks. Yes. The question is whether to have a BGP-LS value=
 for the MPLS LSP Ping DDMAP protocol:&nbsp;<a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-mpls-spring-lsp-ping-02#section-6" class=3D"">https://to=
ols.ietf.org/html/draft-ietf-mpls-spring-lsp-ping-02#section-6</a></div>
</div>
</div>
</blockquote>
</span>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">In that case, it might make sense to add a code point for B=
GP-LS since it is the only way to advertise the SIDs (i.e, labels when MPLS=
 SR is the data plane) for BGP EPE as described in&nbsp;<a href=3D"https://=
www.ietf.org/id/draft-ietf-idr-bgp-prefix-sid-04.txt" class=3D"">https://ww=
w.ietf.org/id/draft-ietf-idr-bgp-prefix-sid-04.txt</a>.
 However, one could argue that specifying BGP would suffice since unless yo=
u are going to specify other BGP Address Families (AFI/SAFI tuples) as indi=
vidual protocols.&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
</div>
</div>
</blockquote>
<div><br class=3D"">
</div>
<div>That&#8217;s exactly the question &#8212; use the BGP protocol or defi=
ne a new BGP-LS?&nbsp;</div>
<div><br class=3D"">
</div>
<div>To me though, until someone sits down to do the BGP EPE LSP Ping analy=
sis, we should not assume one way or another.</div>
</div>
</div>
</div>
</div>
</blockquote>
</span>
<div><br>
</div>
<div>I&#8217;d vote to just use BGP rather than setting the precedent of a =
separate protocol ID for an AFI/SAFI &#8211; are we going to have a protoco=
l ID for BGP L3VPN or BGP EVPN? I guess the question is, from an OAM perspe=
ctive, how is the DDMAP protocol going to be
 used?&nbsp;</div>
<div><br>
</div>
<div>Thanks,&nbsp;</div>
<div>Acee</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space;" class=3D"">
<div class=3D"">
<div>
<div><br class=3D"">
</div>
<div>Thanks,</div>
<div><br class=3D"">
</div>
<div>Carlos.</div>
<br class=3D"">
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<div class=3D""></div>
<div class=3D"">Thanks,</div>
<div class=3D"">Acee&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
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<div class=3D"">Thanks,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Carlos.</div>
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Date: Sat, 11 Feb 2017 22:25:23 +0000
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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--_000_AE1C8AAB40E84457A73920A1231F0839ciscocom_--


From nobody Sat Feb 11 19:01:20 2017
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To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>
References: <D4C4B5FD.9C23E%acee@cisco.com> <D713341E-F21A-4632-BB1D-0880FF36C9EF@cisco.com> <D4C4C7FA.9C253%acee@cisco.com> <A9C6442D-12AA-4CD8-9F9C-76B0CBF42AC5@cisco.com> <D4C4F29D.9C26B%acee@cisco.com> <AE1C8AAB-40E8-4457-A739-20A1231F0839@cisco.com>
From: Loa Andersson <loa@pi.nu>
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Date: Sun, 12 Feb 2017 11:00:54 +0800
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-spring-lsp-ping@ietf.org" <draft-ietf-mpls-spring-lsp-ping@ietf.org>
Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Carlos and Acee,

OK - I agree.

Authors,

can you update the document with the other changes discussed?

/Loa

/Loa

On 2017-02-12 06:25, Carlos Pignataro (cpignata) wrote:
> I agree, Acee.
>
>
>
> *From: *"Acee Lindem (acee)" <acee@cisco.com>
> *Date: *Saturday, February 11, 2017 at 4:59 PM
> *To: *Carlos Pignataro <cpignata@cisco.com>
> *Cc: *Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>,
> "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,
> "draft-ietf-mpls-spring-lsp-ping@ietf.org"
> <draft-ietf-mpls-spring-lsp-ping@ietf.org>
> *Subject: *Re: [mpls] nits and question on
> draft-ietf-mpls-spring-lsp-ping-02
>
>
>
> Hi Carlos,
>
>
>
> *From: *"Carlos Pignataro (cpignata)" <cpignata@cisco.com
> <mailto:cpignata@cisco.com>>
> *Date: *Saturday, February 11, 2017 at 2:16 PM
> *To: *Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>
> *Cc: *Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>, "mpls@ietf.org
> <mailto:mpls@ietf.org>" <mpls@ietf.org <mailto:mpls@ietf.org>>,
> "mpls-chairs@ietf.org <mailto:mpls-chairs@ietf.org>"
> <mpls-chairs@ietf.org <mailto:mpls-chairs@ietf.org>>,
> "draft-ietf-mpls-spring-lsp-ping@ietf.org
> <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>"
> <draft-ietf-mpls-spring-lsp-ping@ietf.org
> <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>>
> *Subject: *Re: [mpls] nits and question on
> draft-ietf-mpls-spring-lsp-ping-02
>
>
>
>     Hi Acee,
>
>
>
>         On Feb 11, 2017, at 2:02 PM, Acee Lindem (acee) <acee@cisco.com
>         <mailto:acee@cisco.com>> wrote:
>
>
>
>         Hi Carlos,
>
>
>
>         I guess I commented without knowing the context of the comment
>         ;^) See inline.
>
>
>
>         *From: *"Carlos Pignataro (cpignata)" <cpignata@cisco.com
>         <mailto:cpignata@cisco.com>>
>         *Date: *Saturday, February 11, 2017 at 1:29 PM
>         *To: *Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>
>         *Cc: *Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>,
>         "mpls@ietf.org <mailto:mpls@ietf.org>" <mpls@ietf.org
>         <mailto:mpls@ietf.org>>, "mpls-chairs@ietf.org
>         <mailto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org
>         <mailto:mpls-chairs@ietf.org>>,
>         "draft-ietf-mpls-spring-lsp-ping@ietf.org
>         <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>"
>         <draft-ietf-mpls-spring-lsp-ping@ietf.org
>         <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>>
>         *Subject: *Re: [mpls] nits and question on
>         draft-ietf-mpls-spring-lsp-ping-02
>
>
>
>             Hi, Acee,
>
>                 On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee)
>                 <acee@cisco.com <mailto:acee@cisco.com>> wrote:
>
>
>
>                         And a last question, should BGP-LS be in that
>                         registry?
>
>
>                     I guess no until someone needs it?
>
>
>                 BGP-LS has its own set of registries.
>
>
>
>             Thanks. Yes. The question is whether to have a BGP-LS value
>             for the MPLS LSP Ping DDMAP
>             protocol: https://tools.ietf.org/html/draft-ietf-mpls-spring-lsp-ping-02#section-6
>
>
>
>         In that case, it might make sense to add a code point for BGP-LS
>         since it is the only way to advertise the SIDs (i.e, labels when
>         MPLS SR is the data plane) for BGP EPE as described
>         in https://www.ietf.org/id/draft-ietf-idr-bgp-prefix-sid-04.txt.
>         However, one could argue that specifying BGP would suffice since
>         unless you are going to specify other BGP Address Families
>         (AFI/SAFI tuples) as individual protocols.
>
>
>
>
>
>     Thatâ€™s exactly the question â€” use the BGP protocol or define a new
>     BGP-LS?
>
>
>
>     To me though, until someone sits down to do the BGP EPE LSP Ping
>     analysis, we should not assume one way or another.
>
>
>
> Iâ€™d vote to just use BGP rather than setting the precedent of a separate
> protocol ID for an AFI/SAFI â€“ are we going to have a protocol ID for BGP
> L3VPN or BGP EVPN? I guess the question is, from an OAM perspective, how
> is the DDMAP protocol going to be used?
>
>
>
> Thanks,
>
> Acee
>
>
>
>
>
>
>
>
>
>
>
>
>
>     Thanks,
>
>
>
>     Carlos.
>
>
>
>         Thanks,
>
>         Acee
>
>
>
>
>
>
>
>
>
>             Thanks,
>
>
>
>             Carlos.
>
>
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Sun Feb 12 10:44:02 2017
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Subject: [mpls] I-D Action: draft-ietf-mpls-ri-rsvp-frr-01.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 Multiprotocol Label Switching of the IETF.

        Title           : Refresh Interval Independent FRR Facility Protection
        Authors         : Chandra Ramachandran
                          Ina Minei
                          Dante Pacella
                          Tarek Saad
	Filename        : draft-ietf-mpls-ri-rsvp-frr-01.txt
	Pages           : 25
	Date            : 2017-02-12

Abstract:
    RSVP-TE relies on periodic refresh of RSVP messages to synchronize
    and maintain the LSP related states along the reserved path. In the
    absence of refresh messages, the LSP related states are
    automatically deleted. Reliance on periodic refreshes and refresh
    timeouts are problematic from the scalability point of view. The
    number of RSVP-TE LSPs that a router needs to maintain has been
    growing in service provider networks and the implementations should
    be capable of handling increase in LSP scale.

    RFC 2961 specifies mechanisms to eliminate the reliance on periodic
    refresh and refresh timeout of RSVP messages, and enables a router
    to increase the message refresh interval to values much larger than
    the default 30 seconds defined in RFC 2205. However, the protocol
    extensions defined in RFC 4090 for supporting fast reroute (FRR)
    using bypass tunnels implicitly rely on short refresh timeouts to
    cleanup stale states.

    In order to eliminate the reliance on refresh timeouts, the routers
    should unambiguously determine when a particular LSP state should be
    deleted. Coupling LSP state with the corresponding RSVP-TE signaling
    adjacencies as recommended in RSVP-TE Scaling Recommendations
    (draft-ietf-teas-rsvp-te-scaling-rec) will apply in scenarios other
    than RFC 4090 FRR using bypass tunnels. In scenarios involving RFC
    4090 FRR using bypass tunnels, additional explicit tear down
    messages are necessary. Refresh-interval Independent RSVP FRR (RI-
    RSVP-FRR) extensions specified in this document consists of
    procedures to enable LSP state cleanup that are essential in
    scenarios not covered by procedures defined in RSVP-TE Scaling
    Recommendations.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-ri-rsvp-frr/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-ri-rsvp-frr-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ri-rsvp-frr-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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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Loa Andersson <loa@pi.nu>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Date: Sun, 12 Feb 2017 22:04:16 +0000
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Subject: Re: [mpls] nits and question on draft-ietf-mpls-spring-lsp-ping-02
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Loa,

Sorry about the delayed response. We will update the same in the next
revision.

Thanks,
Nagendra

On 2/11/17, 10:00 PM, "Loa Andersson" <loa@pi.nu> wrote:

>Carlos and Acee,
>
>OK - I agree.
>
>Authors,
>
>can you update the document with the other changes discussed?
>
>/Loa
>
>/Loa
>
>On 2017-02-12 06:25, Carlos Pignataro (cpignata) wrote:
>> I agree, Acee.
>>
>>
>>
>> *From: *"Acee Lindem (acee)" <acee@cisco.com>
>> *Date: *Saturday, February 11, 2017 at 4:59 PM
>> *To: *Carlos Pignataro <cpignata@cisco.com>
>> *Cc: *Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>,
>> "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>,
>> "draft-ietf-mpls-spring-lsp-ping@ietf.org"
>> <draft-ietf-mpls-spring-lsp-ping@ietf.org>
>> *Subject: *Re: [mpls] nits and question on
>> draft-ietf-mpls-spring-lsp-ping-02
>>
>>
>>
>> Hi Carlos,
>>
>>
>>
>> *From: *"Carlos Pignataro (cpignata)" <cpignata@cisco.com
>> <mailto:cpignata@cisco.com>>
>> *Date: *Saturday, February 11, 2017 at 2:16 PM
>> *To: *Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>
>> *Cc: *Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>, "mpls@ietf.org
>> <mailto:mpls@ietf.org>" <mpls@ietf.org <mailto:mpls@ietf.org>>,
>> "mpls-chairs@ietf.org <mailto:mpls-chairs@ietf.org>"
>> <mpls-chairs@ietf.org <mailto:mpls-chairs@ietf.org>>,
>> "draft-ietf-mpls-spring-lsp-ping@ietf.org
>> <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>"
>> <draft-ietf-mpls-spring-lsp-ping@ietf.org
>> <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>>
>> *Subject: *Re: [mpls] nits and question on
>> draft-ietf-mpls-spring-lsp-ping-02
>>
>>
>>
>>     Hi Acee,
>>
>>
>>
>>         On Feb 11, 2017, at 2:02 PM, Acee Lindem (acee) <acee@cisco.com
>>         <mailto:acee@cisco.com>> wrote:
>>
>>
>>
>>         Hi Carlos,
>>
>>
>>
>>         I guess I commented without knowing the context of the comment
>>         ;^) See inline.
>>
>>
>>
>>         *From: *"Carlos Pignataro (cpignata)" <cpignata@cisco.com
>>         <mailto:cpignata@cisco.com>>
>>         *Date: *Saturday, February 11, 2017 at 1:29 PM
>>         *To: *Acee Lindem <acee@cisco.com <mailto:acee@cisco.com>>
>>         *Cc: *Loa Andersson <loa@pi.nu <mailto:loa@pi.nu>>,
>>         "mpls@ietf.org <mailto:mpls@ietf.org>" <mpls@ietf.org
>>         <mailto:mpls@ietf.org>>, "mpls-chairs@ietf.org
>>         <mailto:mpls-chairs@ietf.org>" <mpls-chairs@ietf.org
>>         <mailto:mpls-chairs@ietf.org>>,
>>         "draft-ietf-mpls-spring-lsp-ping@ietf.org
>>         <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>"
>>         <draft-ietf-mpls-spring-lsp-ping@ietf.org
>>         <mailto:draft-ietf-mpls-spring-lsp-ping@ietf.org>>
>>         *Subject: *Re: [mpls] nits and question on
>>         draft-ietf-mpls-spring-lsp-ping-02
>>
>>
>>
>>             Hi, Acee,
>>
>>                 On Feb 11, 2017, at 12:40 PM, Acee Lindem (acee)
>>                 <acee@cisco.com <mailto:acee@cisco.com>> wrote:
>>
>>
>>
>>                         And a last question, should BGP-LS be in that
>>                         registry?
>>
>>
>>                     I guess no until someone needs it?
>>
>>
>>                 BGP-LS has its own set of registries.
>>
>>
>>
>>             Thanks. Yes. The question is whether to have a BGP-LS value
>>             for the MPLS LSP Ping DDMAP
>>             protocol:
>>https://tools.ietf.org/html/draft-ietf-mpls-spring-lsp-ping-02#section-6
>>
>>
>>
>>         In that case, it might make sense to add a code point for BGP-LS
>>         since it is the only way to advertise the SIDs (i.e, labels when
>>         MPLS SR is the data plane) for BGP EPE as described
>>         in https://www.ietf.org/id/draft-ietf-idr-bgp-prefix-sid-04.txt.
>>         However, one could argue that specifying BGP would suffice since
>>         unless you are going to specify other BGP Address Families
>>         (AFI/SAFI tuples) as individual protocols.
>>
>>
>>
>>
>>
>>     That=B9s exactly the question =8B use the BGP protocol or define a n=
ew
>>     BGP-LS?
>>
>>
>>
>>     To me though, until someone sits down to do the BGP EPE LSP Ping
>>     analysis, we should not assume one way or another.
>>
>>
>>
>> I=B9d vote to just use BGP rather than setting the precedent of a separa=
te
>> protocol ID for an AFI/SAFI =AD are we going to have a protocol ID for B=
GP
>> L3VPN or BGP EVPN? I guess the question is, from an OAM perspective, how
>> is the DDMAP protocol going to be used?
>>
>>
>>
>> Thanks,
>>
>> Acee
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>     Thanks,
>>
>>
>>
>>     Carlos.
>>
>>
>>
>>         Thanks,
>>
>>         Acee
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>             Thanks,
>>
>>
>>
>>             Carlos.
>>
>>
>>
>
>--=20
>
>
>Loa Andersson                        email: loa@mail01.huawei.com
>Senior MPLS Expert                          loa@pi.nu
>Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Mon Feb 13 13:51:52 2017
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Reviewer: Robert Sparks
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-mpls-residence-time-13
Reviewer: Robert Sparks
Review Date: 2017-02-13
IETF LC End Date: 2017-01-17
IESG Telechat date: 2017-03-02

Summary: Ready for publication as PS

Thanks for addressing my comments.
(I still think some discussion about taking arrival and departure time
measurements would be helpful, even if it only said "do it
consistently so you don't indicate jitter that's not really there".)


From nobody Mon Feb 13 17:02:49 2017
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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Hi Robert,
thank you for your review and patience as we've been working on the
document. The text you've proposed is indeed useful to implementer and I'll
add it with the next update.

Regards,
Greg

On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com> wrote:

> Reviewer: Robert Sparks
> 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-mpls-residence-time-13
> Reviewer: Robert Sparks
> Review Date: 2017-02-13
> IETF LC End Date: 2017-01-17
> IESG Telechat date: 2017-03-02
>
> Summary: Ready for publication as PS
>
> Thanks for addressing my comments.
> (I still think some discussion about taking arrival and departure time
> measurements would be helpful, even if it only said "do it
> consistently so you don't indicate jitter that's not really there".)
>
>

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<div dir=3D"ltr">Hi Robert,<div>thank you for your review and patience as w=
e&#39;ve been working on the document. The text you&#39;ve proposed is inde=
ed useful to implementer and I&#39;ll add it with the next update.=C2=A0</d=
iv><div><br></div><div>Regards,</div><div>Greg</div></div><div class=3D"gma=
il_extra"><br><div class=3D"gmail_quote">On Mon, Feb 13, 2017 at 1:51 PM, R=
obert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.com" =
target=3D"_blank">rjsparks@nostrum.com</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">Reviewer: Robert Sparks<br>
Review result: Ready<br>
<br>
I am the assigned Gen-ART reviewer for this draft. The General Area<br>
Review Team (Gen-ART) reviews all IETF documents being processed<br>
by the IESG for the IETF Chair. Please wait for direction from your<br>
document shepherd or AD before posting a new version of the draft.<br>
<br>
For more information, please see the FAQ at<br>
<br>
&lt;<a href=3D"https://trac.ietf.org/trac/gen/wiki/GenArtfaq" rel=3D"norefe=
rrer" target=3D"_blank">https://trac.ietf.org/trac/<wbr>gen/wiki/GenArtfaq<=
/a>&gt;.<br>
<br>
Document: draft-ietf-mpls-residence-<wbr>time-13<br>
Reviewer: Robert Sparks<br>
Review Date: 2017-02-13<br>
IETF LC End Date: 2017-01-17<br>
IESG Telechat date: 2017-03-02<br>
<br>
Summary: Ready for publication as PS<br>
<br>
Thanks for addressing my comments.<br>
(I still think some discussion about taking arrival and departure time<br>
measurements would be helpful, even if it only said &quot;do it<br>
consistently so you don&#39;t indicate jitter that&#39;s not really there&q=
uot;.)<br>
<br>
</blockquote></div><br></div>

--001a1145009e2b34b20548731f7d--


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From: Loa Andersson <loa@pi.nu>
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Date: Wed, 15 Feb 2017 11:22:24 +0800
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Subject: [mpls] Closed -- Re: Working group last call on draft-ietf-mpls-residence-time
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Working Groups,

This working group last call is closed.

Authors,
There have been comments, the discussion during the wglc seems to have
converged on ways to address these comments,

Can the authors please post a new version of the the document.

/Loa

On 2017-01-31 00:01, Loa Andersson wrote:
> Working Groups,
>
> This is to initiate a two week working group last call in four working
> groups on draft-ietf-mpls-residence-time-13.
>
> The MPLS working group has done an earlier working group last call and
> a request for publication has been made.
>
> The changes to the document were such that we decided to do a new
> working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.
>
> There are three major changes between the version of the document for
> which publication was requested are:
>
> (1) that section 7 " One-step Clock and Two-step Clock Modes" has been
>     moved up to become section 2.1.
> (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM
>     Capability when IS-IS used advertise RTM capabilities
> (3) BGP-LS has been added as a RTM capability advertisement method
>
> A side-by-side diff between version -12 and -13 is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-residence-time-13
>
> Please send your comments to the mpls wg mailing list (mpls@ietf.org),
> if you are not subscribed to the mpls wg list, send to "your own"
> working group mailing list, and we'll make sure they are posted to the
> MPLS wg list.
>
> There were one IPR disclosure against this document.
>
> All the authors and contributors have stated on the working group
> mailing list that they are not aware of any other IPRs that relates
> to this document.
>
> This working group last call ends February 13, 2017.
>
>
> /Loa
> MPLS wg co-chairs

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 14 Feb 2017 19:46:53 -0800
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To: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] Closed -- Re: Working group last call on draft-ietf-mpls-residence-time
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--001a1141b0a008c5210548898800
Content-Type: text/plain; charset=UTF-8

Hi Loa, et. al,
many thanks to all who reviewed the draft and shared their comments that
helped us to improve this document.
I'll post the updated version shortly.

Regards,
Greg

On Tue, Feb 14, 2017 at 7:22 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Groups,
>
> This working group last call is closed.
>
> Authors,
> There have been comments, the discussion during the wglc seems to have
> converged on ways to address these comments,
>
> Can the authors please post a new version of the the document.
>
> /Loa
>
> On 2017-01-31 00:01, Loa Andersson wrote:
>
>> Working Groups,
>>
>> This is to initiate a two week working group last call in four working
>> groups on draft-ietf-mpls-residence-time-13.
>>
>> The MPLS working group has done an earlier working group last call and
>> a request for publication has been made.
>>
>> The changes to the document were such that we decided to do a new
>> working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.
>>
>> There are three major changes between the version of the document for
>> which publication was requested are:
>>
>> (1) that section 7 " One-step Clock and Two-step Clock Modes" has been
>>     moved up to become section 2.1.
>> (2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM
>>     Capability when IS-IS used advertise RTM capabilities
>> (3) BGP-LS has been added as a RTM capability advertisement method
>>
>> A side-by-side diff between version -12 and -13 is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-residence-time-13
>>
>> Please send your comments to the mpls wg mailing list (mpls@ietf.org),
>> if you are not subscribed to the mpls wg list, send to "your own"
>> working group mailing list, and we'll make sure they are posted to the
>> MPLS wg list.
>>
>> There were one IPR disclosure against this document.
>>
>> All the authors and contributors have stated on the working group
>> mailing list that they are not aware of any other IPRs that relates
>> to this document.
>>
>> This working group last call ends February 13, 2017.
>>
>>
>> /Loa
>> MPLS wg co-chairs
>>
>
> --
>
>
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--001a1141b0a008c5210548898800
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Loa, et. al,<div>many thanks to all who reviewed the dr=
aft and shared their comments that helped us to improve this document.</div=
><div>I&#39;ll post the updated version shortly.</div><div><br></div><div>R=
egards,</div><div>Greg</div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Tue, Feb 14, 2017 at 7:22 PM, Loa Andersson <span dir=
=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex">Working Groups,<br>
<br>
This working group last call is closed.<br>
<br>
Authors,<br>
There have been comments, the discussion during the wglc seems to have<br>
converged on ways to address these comments,<br>
<br>
Can the authors please post a new version of the the document.<br>
<br>
/Loa<br>
<br>
On 2017-01-31 00:01, Loa Andersson wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Working Groups,<br>
<br>
This is to initiate a two week working group last call in four working<br>
groups on draft-ietf-mpls-residence-time<wbr>-13.<br>
<br>
The MPLS working group has done an earlier working group last call and<br>
a request for publication has been made.<br>
<br>
The changes to the document were such that we decided to do a new<br>
working group last call and extend it to MPLS, TEAS, OSPF and IS-IS.<br>
<br>
There are three major changes between the version of the document for<br>
which publication was requested are:<br>
<br>
(1) that section 7 &quot; One-step Clock and Two-step Clock Modes&quot; has=
 been<br>
=C2=A0 =C2=A0 moved up to become section 2.1.<br>
(2) that a sub-TLV for TLV 22 instead of TLV 251 is used to RTM<br>
=C2=A0 =C2=A0 Capability when IS-IS used advertise RTM capabilities<br>
(3) BGP-LS has been added as a RTM capability advertisement method<br>
<br>
A side-by-side diff between version -12 and -13 is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-residence-ti=
me-13" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?u<=
wbr>rl2=3Ddraft-ietf-mpls-residence-<wbr>time-13</a><br>
<br>
Please send your comments to the mpls wg mailing list (<a href=3D"mailto:mp=
ls@ietf.org" target=3D"_blank">mpls@ietf.org</a>),<br>
if you are not subscribed to the mpls wg list, send to &quot;your own&quot;=
<br>
working group mailing list, and we&#39;ll make sure they are posted to the<=
br>
MPLS wg list.<br>
<br>
There were one IPR disclosure against this document.<br>
<br>
All the authors and contributors have stated on the working group<br>
mailing list that they are not aware of any other IPRs that relates<br>
to this document.<br>
<br>
This working group last call ends February 13, 2017.<br>
<br>
<br>
/Loa<br>
MPLS wg co-chairs<span class=3D"HOEnZb"><font color=3D"#888888"><br>
</font></span></blockquote><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@mail01.huawei.com" targe=
t=3D"_blank">loa@mail01.huawei.com</a><br>
Senior MPLS Expert=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 <a href=3D"mailto:loa@pi.nu" target=3D"_=
blank">loa@pi.nu</a><br>
Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_blank">+46 739=
 81 21 64</a><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>

--001a1141b0a008c5210548898800--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 14 Feb 2017 20:06:36 -0800
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To: Robert Sparks <rjsparks@nostrum.com>
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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Hi Robert,
Section 5 Data Plane Theory of Operation has the following recommendation
on reading time value at ingress and egress:

   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.


Do you find the text sufficient in providing guidance to an implementer of RTM?


Regards,

Greg


On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com> wrote:

> Reviewer: Robert Sparks
> 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-mpls-residence-time-13
> Reviewer: Robert Sparks
> Review Date: 2017-02-13
> IETF LC End Date: 2017-01-17
> IESG Telechat date: 2017-03-02
>
> Summary: Ready for publication as PS
>
> Thanks for addressing my comments.
> (I still think some discussion about taking arrival and departure time
> measurements would be helpful, even if it only said "do it
> consistently so you don't indicate jitter that's not really there".)
>
>

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<div dir=3D"ltr">Hi Robert,<div>Section 5 Data Plane Theory of Operation ha=
s the following recommendation on reading time value at ingress and egress:=
</div><div><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin=
-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre><pre class=3D"gmai=
l-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;co=
lor:rgb(0,0,0)"><br></pre><pre class=3D"gmail-newpage" style=3D"font-size:1=
3.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you find the=
 text sufficient in providing guidance to an implementer of RTM?</pre><pre =
class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-=
bottom:0px;color:rgb(0,0,0)"><br></pre><pre class=3D"gmail-newpage" style=
=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">=
Regards,</pre><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;mar=
gin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre></div></div><div =
class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Feb 13, 2017 a=
t 1:51 PM, Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@n=
ostrum.com" target=3D"_blank">rjsparks@nostrum.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">Reviewer: Robert Sparks<br>
Review result: Ready<br>
<br>
I am the assigned Gen-ART reviewer for this draft. The General Area<br>
Review Team (Gen-ART) reviews all IETF documents being processed<br>
by the IESG for the IETF Chair. Please wait for direction from your<br>
document shepherd or AD before posting a new version of the draft.<br>
<br>
For more information, please see the FAQ at<br>
<br>
&lt;<a href=3D"https://trac.ietf.org/trac/gen/wiki/GenArtfaq" rel=3D"norefe=
rrer" target=3D"_blank">https://trac.ietf.org/trac/<wbr>gen/wiki/GenArtfaq<=
/a>&gt;.<br>
<br>
Document: draft-ietf-mpls-residence-<wbr>time-13<br>
Reviewer: Robert Sparks<br>
Review Date: 2017-02-13<br>
IETF LC End Date: 2017-01-17<br>
IESG Telechat date: 2017-03-02<br>
<br>
Summary: Ready for publication as PS<br>
<br>
Thanks for addressing my comments.<br>
(I still think some discussion about taking arrival and departure time<br>
measurements would be helpful, even if it only said &quot;do it<br>
consistently so you don&#39;t indicate jitter that&#39;s not really there&q=
uot;.)<br>
<br>
</blockquote></div><br></div>

--001a113e451c964681054889cea9--


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To: Greg Mirsky <gregimirsky@gmail.com>
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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On 2/14/17 10:06 PM, Greg Mirsky wrote:
> Hi Robert,
> Section 5 Data Plane Theory of Operation has the following 
> recommendation on reading time value at ingress and egress:
>     Each RTM-capable
>     node on the explicit path receives an RTM packet and records the time
>     at which it receives that packet at its ingress interface as well as
>     the time at which it transmits that packet from its egress interface;
>     this should be done as close to the physical layer as possible to
>     ensure precise accuracy in time determination.
> Do you find the text sufficient in providing guidance to an implementer of RTM?
Well, no - that was point in the text from my review of -12 that caused 
me to make comment in the first place.

What does "precise accuracy" even _MEAN_? You're waving your hands with 
words that don't help the reader guess what you mean at the moment. The 
subsequent email exchange said the important part was that you measure 
_precisely_ (in that the measurements are always taken the same way), 
but accuracy isn't that important (you've (and here by "you" I mean the 
set of people that have responded to the review") told me it's not 
important whether the reading is taken at the beginning of the 
bit-stream, the end, or several 1000 nanoseconds after the last bit came 
off the physical media as long as it's done the same way for each 
packet). The fact that you're carrying a measurement that can talk about 
times smaller than the interarrival time for individual bits for some 
real world line speeds says that different implementations taking the 
measurement different ways is going to result in different residence 
time measurements, even if the residence time was really identical. 
You've told me that's not important to the protocol using the 
measurement as long as the an individual implementation doesn't 
introduce something that will look to the using protocol like jitter 
that's not really there.

The text does not say that to an implementer right now.

To restate that long paragraph with maybe a longer one,  assume a 
simplified world where everything is perfectly constant. Packets are all 
flowing at the same size and same rate. For reference, I assert that the 
time between the first bit of a packet entering the system taking the 
measurement and the first bit of that packet leaving the system is 
exactly T (every time). You are telling me that if the system returns cT 
for some constant T other than 1 (and not necessarily  close to 1), 
everything is fine. You're also telling me that if you replace the 
system with another that preserves T, but measures differently so that 
it returns c'T where c' != c, everything is fine. The important part to 
you is that c and c' don't change for their respective systems. (That 
surprises me, I can see how the way the clocks are going to use this 
will do the right thing, but I can't help but think someone later will 
look at the difference between the two systems and say something is 
wrong with one of them). What you've told me is not fine is that if you 
drop i a third system that also preserves T but reports aT where a 
_varies_ over some range.

Have I heard you correctly?
> Regards,
> Greg
>
> On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com 
> <mailto:rjsparks@nostrum.com>> wrote:
>
>     Reviewer: Robert Sparks
>     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
>     <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>>.
>
>     Document: draft-ietf-mpls-residence-time-13
>     Reviewer: Robert Sparks
>     Review Date: 2017-02-13
>     IETF LC End Date: 2017-01-17
>     IESG Telechat date: 2017-03-02
>
>     Summary: Ready for publication as PS
>
>     Thanks for addressing my comments.
>     (I still think some discussion about taking arrival and departure time
>     measurements would be helpful, even if it only said "do it
>     consistently so you don't indicate jitter that's not really there".)
>
>


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    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 2/14/17 10:06 PM, Greg Mirsky wrote:<br>
    </div>
    <blockquote
cite="mid:CA+RyBmWaTBNzycSyEu8BLCZA3jF2t-_vy3chosvrmurkamNEfQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hi Robert,
        <div>Section 5 Data Plane Theory of Operation has the following
          recommendation on reading time value at ingress and egress:</div>
        <div>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">
</pre>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you find the text sufficient in providing guidance to an implementer of RTM?</pre>
        </div>
      </div>
    </blockquote>
    Well, no - that was point in the text from my review of -12 that
    caused me to make comment in the first place.<br>
    <br>
    What does "precise accuracy" even _MEAN_? You're waving your hands
    with words that don't help the reader guess what you mean at the
    moment. The subsequent email exchange said the important part was
    that you measure _precisely_ (in that the measurements are always
    taken the same way), but accuracy isn't that important (you've (and
    here by "you" I mean the set of people that have responded to the
    review") told me it's not important whether the reading is taken at
    the beginning of the bit-stream, the end, or several 1000
    nanoseconds after the last bit came off the physical media as long
    as it's done the same way for each packet). The fact that you're
    carrying a measurement that can talk about times smaller than the
    interarrival time for individual bits for some real world line
    speeds says that different implementations taking the measurement
    different ways is going to result in different residence time
    measurements, even if the residence time was really identical.
    You've told me that's not important to the protocol using the
    measurement as long as the an individual implementation doesn't
    introduce something that will look to the using protocol like jitter
    that's not really there.<br>
    <br>
    The text does not say that to an implementer right now.<br>
    <br>
    To restate that long paragraph with maybe a longer one,Â  assume a
    simplified world where everything is perfectly constant. Packets are
    all flowing at the same size and same rate. For reference, I assert
    that the time between the first bit of a packet entering the system
    taking the measurement and the first bit of that packet leaving the
    system is exactly T (every time). You are telling me that if the
    system returns cT for some constant T other than 1 (and not
    necessarilyÂ  close to 1), everything is fine. You're also telling me
    that if you replace the system with another that preserves T, but
    measures differently so that it returns c'T where c' != c,
    everything is fine. The important part to you is that c and c' don't
    change for their respective systems. (That surprises me, I can see
    how the way the clocks are going to use this will do the right
    thing, but I can't help but think someone later will look at the
    difference between the two systems and say something is wrong with
    one of them). What you've told me is not fine is that if you drop i
    a third system that also preserves T but reports aT where a _varies_
    over some range.<br>
    <br>
    Have I heard you correctly?<br>
    <blockquote
cite="mid:CA+RyBmWaTBNzycSyEu8BLCZA3jF2t-_vy3chosvrmurkamNEfQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">
</pre>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Regards,</pre>
          <pre class="gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Mon, Feb 13, 2017 at 1:51 PM, Robert
          Sparks <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:rjsparks@nostrum.com" target="_blank">rjsparks@nostrum.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Reviewer:
            Robert Sparks<br>
            Review result: Ready<br>
            <br>
            I am the assigned Gen-ART reviewer for this draft. The
            General Area<br>
            Review Team (Gen-ART) reviews all IETF documents being
            processed<br>
            by the IESG for the IETF Chair. Please wait for direction
            from your<br>
            document shepherd or AD before posting a new version of the
            draft.<br>
            <br>
            For more information, please see the FAQ at<br>
            <br>
            &lt;<a moz-do-not-send="true"
              href="https://trac.ietf.org/trac/gen/wiki/GenArtfaq"
              rel="noreferrer" target="_blank">https://trac.ietf.org/trac/<wbr>gen/wiki/GenArtfaq</a>&gt;.<br>
            <br>
            Document: draft-ietf-mpls-residence-<wbr>time-13<br>
            Reviewer: Robert Sparks<br>
            Review Date: 2017-02-13<br>
            IETF LC End Date: 2017-01-17<br>
            IESG Telechat date: 2017-03-02<br>
            <br>
            Summary: Ready for publication as PS<br>
            <br>
            Thanks for addressing my comments.<br>
            (I still think some discussion about taking arrival and
            departure time<br>
            measurements would be helpful, even if it only said "do it<br>
            consistently so you don't indicate jitter that's not really
            there".)<br>
            <br>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </body>
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--------------8A6A2E153845792501B20E33--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 15 Feb 2017 09:20:55 -0800
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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Hi Robert,
yes, you've absolutely correct in your example. The importance of RTM is to
exclude and quantify, as much as possible, jitter from propagation delay.
I've updated the wording to reflect that. Below is new text I propose,
please let me know if it makes it clearer.

   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.

Regards,

Greg


On Wed, Feb 15, 2017 at 7:43 AM, Robert Sparks <rjsparks@nostrum.com> wrote:

>
>
> On 2/14/17 10:06 PM, Greg Mirsky wrote:
>
> Hi Robert,
> Section 5 Data Plane Theory of Operation has the following recommendation
> on reading time value at ingress and egress:
>
>    Each RTM-capable
>    node on the explicit path receives an RTM packet and records the time
>    at which it receives that packet at its ingress interface as well as
>    the time at which it transmits that packet from its egress interface;
>    this should be done as close to the physical layer as possible to
>    ensure precise accuracy in time determination.
>
> Do you find the text sufficient in providing guidance to an implementer of RTM?
>
> Well, no - that was point in the text from my review of -12 that caused me
> to make comment in the first place.
>
> What does "precise accuracy" even _MEAN_? You're waving your hands with
> words that don't help the reader guess what you mean at the moment. The
> subsequent email exchange said the important part was that you measure
> _precisely_ (in that the measurements are always taken the same way), but
> accuracy isn't that important (you've (and here by "you" I mean the set of
> people that have responded to the review") told me it's not important
> whether the reading is taken at the beginning of the bit-stream, the end,
> or several 1000 nanoseconds after the last bit came off the physical media
> as long as it's done the same way for each packet). The fact that you're
> carrying a measurement that can talk about times smaller than the
> interarrival time for individual bits for some real world line speeds says
> that different implementations taking the measurement different ways is
> going to result in different residence time measurements, even if the
> residence time was really identical. You've told me that's not important to
> the protocol using the measurement as long as the an individual
> implementation doesn't introduce something that will look to the using
> protocol like jitter that's not really there.
>
> The text does not say that to an implementer right now.
>
> To restate that long paragraph with maybe a longer one,  assume a
> simplified world where everything is perfectly constant. Packets are all
> flowing at the same size and same rate. For reference, I assert that the
> time between the first bit of a packet entering the system taking the
> measurement and the first bit of that packet leaving the system is exactly
> T (every time). You are telling me that if the system returns cT for some
> constant T other than 1 (and not necessarily  close to 1), everything is
> fine. You're also telling me that if you replace the system with another
> that preserves T, but measures differently so that it returns c'T where c'
> != c, everything is fine. The important part to you is that c and c' don't
> change for their respective systems. (That surprises me, I can see how the
> way the clocks are going to use this will do the right thing, but I can't
> help but think someone later will look at the difference between the two
> systems and say something is wrong with one of them). What you've told me
> is not fine is that if you drop i a third system that also preserves T but
> reports aT where a _varies_ over some range.
>
> Have I heard you correctly?
>
> Regards,
>
> Greg
>
>
> On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com>
> wrote:
>
>> Reviewer: Robert Sparks
>> 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-mpls-residence-time-13
>> Reviewer: Robert Sparks
>> Review Date: 2017-02-13
>> IETF LC End Date: 2017-01-17
>> IESG Telechat date: 2017-03-02
>>
>> Summary: Ready for publication as PS
>>
>> Thanks for addressing my comments.
>> (I still think some discussion about taking arrival and departure time
>> measurements would be helpful, even if it only said "do it
>> consistently so you don't indicate jitter that's not really there".)
>>
>>
>
>

--001a11402c0248f5be054894e765
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Robert,<div>yes, you&#39;ve absolutely correct in your =
example. The importance of RTM is to exclude and quantify, as much as possi=
ble, jitter from propagation delay. I&#39;ve updated the wording to reflect=
 that. Below is new text I propose, please let me know if it makes it clear=
er.</div><div><pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-spa=
ce:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.</pre><pre style=3D"color:rgb(0,0,0);word=
-wrap:break-word;white-space:pre-wrap">Regards,</pre><pre style=3D"color:rg=
b(0,0,0);word-wrap:break-word;white-space:pre-wrap">Greg</pre></div></div><=
div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Feb 15, 20=
17 at 7:43 AM, Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjspar=
ks@nostrum.com" target=3D"_blank">rjsparks@nostrum.com</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000"><span class=3D"">
    <p><br>
    </p>
    <br>
    <div class=3D"m_3072934530585377958moz-cite-prefix">On 2/14/17 10:06 PM=
, Greg Mirsky wrote:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Robert,
        <div>Section 5 Data Plane Theory of Operation has the following
          recommendation on reading time value at ingress and egress:</div>
        <div>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RT=
M-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"></pre>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you fin=
d the text sufficient in providing guidance to an implementer of RTM?</pre>
        </div>
      </div>
    </blockquote></span>
    Well, no - that was point in the text from my review of -12 that
    caused me to make comment in the first place.<br>
    <br>
    What does &quot;precise accuracy&quot; even _MEAN_? You&#39;re waving y=
our hands
    with words that don&#39;t help the reader guess what you mean at the
    moment. The subsequent email exchange said the important part was
    that you measure _precisely_ (in that the measurements are always
    taken the same way), but accuracy isn&#39;t that important (you&#39;ve =
(and
    here by &quot;you&quot; I mean the set of people that have responded to=
 the
    review&quot;) told me it&#39;s not important whether the reading is tak=
en at
    the beginning of the bit-stream, the end, or several 1000
    nanoseconds after the last bit came off the physical media as long
    as it&#39;s done the same way for each packet). The fact that you&#39;r=
e
    carrying a measurement that can talk about times smaller than the
    interarrival time for individual bits for some real world line
    speeds says that different implementations taking the measurement
    different ways is going to result in different residence time
    measurements, even if the residence time was really identical.
    You&#39;ve told me that&#39;s not important to the protocol using the
    measurement as long as the an individual implementation doesn&#39;t
    introduce something that will look to the using protocol like jitter
    that&#39;s not really there.<br>
    <br>
    The text does not say that to an implementer right now.<br>
    <br>
    To restate that long paragraph with maybe a longer one,=C2=A0 assume a
    simplified world where everything is perfectly constant. Packets are
    all flowing at the same size and same rate. For reference, I assert
    that the time between the first bit of a packet entering the system
    taking the measurement and the first bit of that packet leaving the
    system is exactly T (every time). You are telling me that if the
    system returns cT for some constant T other than 1 (and not
    necessarily=C2=A0 close to 1), everything is fine. You&#39;re also tell=
ing me
    that if you replace the system with another that preserves T, but
    measures differently so that it returns c&#39;T where c&#39; !=3D c,
    everything is fine. The important part to you is that c and c&#39; don&=
#39;t
    change for their respective systems. (That surprises me, I can see
    how the way the clocks are going to use this will do the right
    thing, but I can&#39;t help but think someone later will look at the
    difference between the two systems and say something is wrong with
    one of them). What you&#39;ve told me is not fine is that if you drop i
    a third system that also preserves T but reports aT where a _varies_
    over some range.<br>
    <br>
    Have I heard you correctly?<span class=3D""><br>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)"></pre>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Regards,</=
pre>
          <pre class=3D"m_3072934530585377958gmail-newpage" style=3D"font-s=
ize:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre>
        </div>
      </div>
      <div class=3D"gmail_extra"><br>
        <div class=3D"gmail_quote">On Mon, Feb 13, 2017 at 1:51 PM, Robert
          Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.c=
om" target=3D"_blank">rjsparks@nostrum.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">Reviewer:
            Robert Sparks<br>
            Review result: Ready<br>
            <br>
            I am the assigned Gen-ART reviewer for this draft. The
            General Area<br>
            Review Team (Gen-ART) reviews all IETF documents being
            processed<br>
            by the IESG for the IETF Chair. Please wait for direction
            from your<br>
            document shepherd or AD before posting a new version of the
            draft.<br>
            <br>
            For more information, please see the FAQ at<br>
            <br>
            &lt;<a href=3D"https://trac.ietf.org/trac/gen/wiki/GenArtfaq" r=
el=3D"noreferrer" target=3D"_blank">https://trac.ietf.org/trac/ge<wbr>n/wik=
i/GenArtfaq</a>&gt;.<br>
            <br>
            Document: draft-ietf-mpls-residence-time<wbr>-13<br>
            Reviewer: Robert Sparks<br>
            Review Date: 2017-02-13<br>
            IETF LC End Date: 2017-01-17<br>
            IESG Telechat date: 2017-03-02<br>
            <br>
            Summary: Ready for publication as PS<br>
            <br>
            Thanks for addressing my comments.<br>
            (I still think some discussion about taking arrival and
            departure time<br>
            measurements would be helpful, even if it only said &quot;do it=
<br>
            consistently so you don&#39;t indicate jitter that&#39;s not re=
ally
            there&quot;.)<br>
            <br>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </span></div>

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

--001a11402c0248f5be054894e765--


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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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On 2/15/17 11:20 AM, Greg Mirsky wrote:
> Hi Robert,
> yes, you've absolutely correct in your example. The importance of RTM 
> is to exclude and quantify, as much as possible, jitter from 
> propagation delay. I've updated the wording to reflect that. Below is 
> new text I propose, please let me know if it makes it clearer.
>     Each RTM-capable
>     node on the explicit path receives an RTM packet and records the time
>     at which it receives that packet at its ingress interface as well as
>     the time at which it transmits that packet from its egress interface.
>     These actions should be done as close to the physical layer as
>     possible at the same point of packet processing striving to avoid
>     introduction of jitter in propogation delay to ensure precise
>     accuracy in time determination.
perhaps change "avoid introduction of jitter" to "avoid introducing the 
appearance of jitter that's not really there"?

(I'm about to board a plane, so further responses will be very delayed).
> Regards,
> Greg
>
> On Wed, Feb 15, 2017 at 7:43 AM, Robert Sparks <rjsparks@nostrum.com 
> <mailto:rjsparks@nostrum.com>> wrote:
>
>
>
>     On 2/14/17 10:06 PM, Greg Mirsky wrote:
>>     Hi Robert,
>>     Section 5 Data Plane Theory of Operation has the following
>>     recommendation on reading time value at ingress and egress:
>>         Each RTM-capable
>>         node on the explicit path receives an RTM packet and records the time
>>         at which it receives that packet at its ingress interface as well as
>>         the time at which it transmits that packet from its egress interface;
>>         this should be done as close to the physical layer as possible to
>>         ensure precise accuracy in time determination.
>>     Do you find the text sufficient in providing guidance to an implementer of RTM?
>     Well, no - that was point in the text from my review of -12 that
>     caused me to make comment in the first place.
>
>     What does "precise accuracy" even _MEAN_? You're waving your hands
>     with words that don't help the reader guess what you mean at the
>     moment. The subsequent email exchange said the important part was
>     that you measure _precisely_ (in that the measurements are always
>     taken the same way), but accuracy isn't that important (you've
>     (and here by "you" I mean the set of people that have responded to
>     the review") told me it's not important whether the reading is
>     taken at the beginning of the bit-stream, the end, or several 1000
>     nanoseconds after the last bit came off the physical media as long
>     as it's done the same way for each packet). The fact that you're
>     carrying a measurement that can talk about times smaller than the
>     interarrival time for individual bits for some real world line
>     speeds says that different implementations taking the measurement
>     different ways is going to result in different residence time
>     measurements, even if the residence time was really identical.
>     You've told me that's not important to the protocol using the
>     measurement as long as the an individual implementation doesn't
>     introduce something that will look to the using protocol like
>     jitter that's not really there.
>
>     The text does not say that to an implementer right now.
>
>     To restate that long paragraph with maybe a longer one, assume a
>     simplified world where everything is perfectly constant. Packets
>     are all flowing at the same size and same rate. For reference, I
>     assert that the time between the first bit of a packet entering
>     the system taking the measurement and the first bit of that packet
>     leaving the system is exactly T (every time). You are telling me
>     that if the system returns cT for some constant T other than 1
>     (and not necessarily  close to 1), everything is fine. You're also
>     telling me that if you replace the system with another that
>     preserves T, but measures differently so that it returns c'T where
>     c' != c, everything is fine. The important part to you is that c
>     and c' don't change for their respective systems. (That surprises
>     me, I can see how the way the clocks are going to use this will do
>     the right thing, but I can't help but think someone later will
>     look at the difference between the two systems and say something
>     is wrong with one of them). What you've told me is not fine is
>     that if you drop i a third system that also preserves T but
>     reports aT where a _varies_ over some range.
>
>     Have I heard you correctly?
>>     Regards,
>>     Greg
>>
>>     On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks
>>     <rjsparks@nostrum.com <mailto:rjsparks@nostrum.com>> wrote:
>>
>>         Reviewer: Robert Sparks
>>         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
>>         <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>>.
>>
>>         Document: draft-ietf-mpls-residence-time-13
>>         Reviewer: Robert Sparks
>>         Review Date: 2017-02-13
>>         IETF LC End Date: 2017-01-17
>>         IESG Telechat date: 2017-03-02
>>
>>         Summary: Ready for publication as PS
>>
>>         Thanks for addressing my comments.
>>         (I still think some discussion about taking arrival and
>>         departure time
>>         measurements would be helpful, even if it only said "do it
>>         consistently so you don't indicate jitter that's not really
>>         there".)
>>
>>
>
>


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    <br>
    <div class="moz-cite-prefix">On 2/15/17 11:20 AM, Greg Mirsky wrote:<br>
    </div>
    <blockquote
cite="mid:CA+RyBmW8NcThCJt4WscccfTMr29JWa-7oPVaptvOdT1dgi+Q_A@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hi Robert,
        <div>yes, you've absolutely correct in your example. The
          importance of RTM is to exclude and quantify, as much as
          possible, jitter from propagation delay. I've updated the
          wording to reflect that. Below is new text I propose, please
          let me know if it makes it clearer.</div>
        <div>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.</pre>
        </div>
      </div>
    </blockquote>
    perhaps change "avoid introduction of jitter" to "avoid introducing
    the appearance of jitter that's not really there"?<br>
    <br>
    (I'm about to board a plane, so further responses will be very
    delayed). <br>
    <blockquote
cite="mid:CA+RyBmW8NcThCJt4WscccfTMr29JWa-7oPVaptvOdT1dgi+Q_A@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Regards,</pre>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Greg</pre>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Feb 15, 2017 at 7:43 AM, Robert
          Sparks <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:rjsparks@nostrum.com" target="_blank">rjsparks@nostrum.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 bgcolor="#FFFFFF" text="#000000"><span class="">
                <p><br>
                </p>
                <br>
                <div class="m_3072934530585377958moz-cite-prefix">On
                  2/14/17 10:06 PM, Greg Mirsky wrote:<br>
                </div>
                <blockquote type="cite">
                  <div dir="ltr">Hi Robert,
                    <div>Section 5 Data Plane Theory of Operation has
                      the following recommendation on reading time value
                      at ingress and egress:</div>
                    <div>
                      <pre class="m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
                      <pre class="m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you find the text sufficient in providing guidance to an implementer of RTM?</pre>
                    </div>
                  </div>
                </blockquote>
              </span> Well, no - that was point in the text from my
              review of -12 that caused me to make comment in the first
              place.<br>
              <br>
              What does "precise accuracy" even _MEAN_? You're waving
              your hands with words that don't help the reader guess
              what you mean at the moment. The subsequent email exchange
              said the important part was that you measure _precisely_
              (in that the measurements are always taken the same way),
              but accuracy isn't that important (you've (and here by
              "you" I mean the set of people that have responded to the
              review") told me it's not important whether the reading is
              taken at the beginning of the bit-stream, the end, or
              several 1000 nanoseconds after the last bit came off the
              physical media as long as it's done the same way for each
              packet). The fact that you're carrying a measurement that
              can talk about times smaller than the interarrival time
              for individual bits for some real world line speeds says
              that different implementations taking the measurement
              different ways is going to result in different residence
              time measurements, even if the residence time was really
              identical. You've told me that's not important to the
              protocol using the measurement as long as the an
              individual implementation doesn't introduce something that
              will look to the using protocol like jitter that's not
              really there.<br>
              <br>
              The text does not say that to an implementer right now.<br>
              <br>
              To restate that long paragraph with maybe a longer one,Â 
              assume a simplified world where everything is perfectly
              constant. Packets are all flowing at the same size and
              same rate. For reference, I assert that the time between
              the first bit of a packet entering the system taking the
              measurement and the first bit of that packet leaving the
              system is exactly T (every time). You are telling me that
              if the system returns cT for some constant T other than 1
              (and not necessarilyÂ  close to 1), everything is fine.
              You're also telling me that if you replace the system with
              another that preserves T, but measures differently so that
              it returns c'T where c' != c, everything is fine. The
              important part to you is that c and c' don't change for
              their respective systems. (That surprises me, I can see
              how the way the clocks are going to use this will do the
              right thing, but I can't help but think someone later will
              look at the difference between the two systems and say
              something is wrong with one of them). What you've told me
              is not fine is that if you drop i a third system that also
              preserves T but reports aT where a _varies_ over some
              range.<br>
              <br>
              Have I heard you correctly?<span class=""><br>
                <blockquote type="cite">
                  <div dir="ltr">
                    <div>
                      <pre class="m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Regards,</pre>
                      <pre class="m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre>
                    </div>
                  </div>
                  <div class="gmail_extra"><br>
                    <div class="gmail_quote">On Mon, Feb 13, 2017 at
                      1:51 PM, Robert Sparks <span dir="ltr">&lt;<a
                          moz-do-not-send="true"
                          href="mailto:rjsparks@nostrum.com"
                          target="_blank">rjsparks@nostrum.com</a>&gt;</span>
                      wrote:<br>
                      <blockquote class="gmail_quote" style="margin:0 0
                        0 .8ex;border-left:1px #ccc
                        solid;padding-left:1ex">Reviewer: Robert Sparks<br>
                        Review result: Ready<br>
                        <br>
                        I am the assigned Gen-ART reviewer for this
                        draft. The General Area<br>
                        Review Team (Gen-ART) reviews all IETF documents
                        being processed<br>
                        by the IESG for the IETF Chair. Please wait for
                        direction from your<br>
                        document shepherd or AD before posting a new
                        version of the draft.<br>
                        <br>
                        For more information, please see the FAQ at<br>
                        <br>
                        &lt;<a moz-do-not-send="true"
                          href="https://trac.ietf.org/trac/gen/wiki/GenArtfaq"
                          rel="noreferrer" target="_blank">https://trac.ietf.org/trac/ge<wbr>n/wiki/GenArtfaq</a>&gt;.<br>
                        <br>
                        Document: draft-ietf-mpls-residence-time<wbr>-13<br>
                        Reviewer: Robert Sparks<br>
                        Review Date: 2017-02-13<br>
                        IETF LC End Date: 2017-01-17<br>
                        IESG Telechat date: 2017-03-02<br>
                        <br>
                        Summary: Ready for publication as PS<br>
                        <br>
                        Thanks for addressing my comments.<br>
                        (I still think some discussion about taking
                        arrival and departure time<br>
                        measurements would be helpful, even if it only
                        said "do it<br>
                        consistently so you don't indicate jitter that's
                        not really there".)<br>
                        <br>
                      </blockquote>
                    </div>
                    <br>
                  </div>
                </blockquote>
                <br>
              </span></div>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 15 Feb 2017 12:40:28 -0800
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Hi Robert,
safe travel and here's another version for your consideration. The point
I'm trying to convey is that the jitter is real but must be accounted not
as part of propagation delay but as residence time. Hope I'm getting close.

   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   To ensure precise accuracy in time determination these actions should
   be done as close to the physical layer as possible at the same point
   of packet processing striving to avoid introducing the appearance of
   jitter in propogation delay whereas it should be accounted as
   residence time.

Regards,

Greg


On Wed, Feb 15, 2017 at 11:15 AM, Robert Sparks <rjsparks@nostrum.com>
wrote:

>
>
> On 2/15/17 11:20 AM, Greg Mirsky wrote:
>
> Hi Robert,
> yes, you've absolutely correct in your example. The importance of RTM is
> to exclude and quantify, as much as possible, jitter from propagation
> delay. I've updated the wording to reflect that. Below is new text I
> propose, please let me know if it makes it clearer.
>
>    Each RTM-capable
>    node on the explicit path receives an RTM packet and records the time
>    at which it receives that packet at its ingress interface as well as
>    the time at which it transmits that packet from its egress interface.
>    These actions should be done as close to the physical layer as
>    possible at the same point of packet processing striving to avoid
>    introduction of jitter in propogation delay to ensure precise
>    accuracy in time determination.
>
> perhaps change "avoid introduction of jitter" to "avoid introducing the
> appearance of jitter that's not really there"?
>
> (I'm about to board a plane, so further responses will be very delayed).
>
> Regards,
>
> Greg
>
>
> On Wed, Feb 15, 2017 at 7:43 AM, Robert Sparks <rjsparks@nostrum.com>
> wrote:
>
>>
>>
>> On 2/14/17 10:06 PM, Greg Mirsky wrote:
>>
>> Hi Robert,
>> Section 5 Data Plane Theory of Operation has the following recommendation
>> on reading time value at ingress and egress:
>>
>>    Each RTM-capable
>>    node on the explicit path receives an RTM packet and records the time
>>    at which it receives that packet at its ingress interface as well as
>>    the time at which it transmits that packet from its egress interface;
>>    this should be done as close to the physical layer as possible to
>>    ensure precise accuracy in time determination.
>>
>> Do you find the text sufficient in providing guidance to an implementer of RTM?
>>
>> Well, no - that was point in the text from my review of -12 that caused
>> me to make comment in the first place.
>>
>> What does "precise accuracy" even _MEAN_? You're waving your hands with
>> words that don't help the reader guess what you mean at the moment. The
>> subsequent email exchange said the important part was that you measure
>> _precisely_ (in that the measurements are always taken the same way), but
>> accuracy isn't that important (you've (and here by "you" I mean the set of
>> people that have responded to the review") told me it's not important
>> whether the reading is taken at the beginning of the bit-stream, the end,
>> or several 1000 nanoseconds after the last bit came off the physical media
>> as long as it's done the same way for each packet). The fact that you're
>> carrying a measurement that can talk about times smaller than the
>> interarrival time for individual bits for some real world line speeds says
>> that different implementations taking the measurement different ways is
>> going to result in different residence time measurements, even if the
>> residence time was really identical. You've told me that's not important to
>> the protocol using the measurement as long as the an individual
>> implementation doesn't introduce something that will look to the using
>> protocol like jitter that's not really there.
>>
>> The text does not say that to an implementer right now.
>>
>> To restate that long paragraph with maybe a longer one,  assume a
>> simplified world where everything is perfectly constant. Packets are all
>> flowing at the same size and same rate. For reference, I assert that the
>> time between the first bit of a packet entering the system taking the
>> measurement and the first bit of that packet leaving the system is exactly
>> T (every time). You are telling me that if the system returns cT for some
>> constant T other than 1 (and not necessarily  close to 1), everything is
>> fine. You're also telling me that if you replace the system with another
>> that preserves T, but measures differently so that it returns c'T where c'
>> != c, everything is fine. The important part to you is that c and c' don't
>> change for their respective systems. (That surprises me, I can see how the
>> way the clocks are going to use this will do the right thing, but I can't
>> help but think someone later will look at the difference between the two
>> systems and say something is wrong with one of them). What you've told me
>> is not fine is that if you drop i a third system that also preserves T but
>> reports aT where a _varies_ over some range.
>>
>> Have I heard you correctly?
>>
>> Regards,
>>
>> Greg
>>
>>
>> On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com>
>> wrote:
>>
>>> Reviewer: Robert Sparks
>>> 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-mpls-residence-time-13
>>> Reviewer: Robert Sparks
>>> Review Date: 2017-02-13
>>> IETF LC End Date: 2017-01-17
>>> IESG Telechat date: 2017-03-02
>>>
>>> Summary: Ready for publication as PS
>>>
>>> Thanks for addressing my comments.
>>> (I still think some discussion about taking arrival and departure time
>>> measurements would be helpful, even if it only said "do it
>>> consistently so you don't indicate jitter that's not really there".)
>>>
>>>
>>
>>
>
>

--001a1141b0a0eb4d66054897b029
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Hi Robert,<div>safe travel and here&#39;s another version =
for your consideration. The point I&#39;m trying to convey is that the jitt=
er is real but must be accounted not as part of propagation delay but as re=
sidence time. Hope I&#39;m getting close.</div><div><pre style=3D"color:rgb=
(0,0,0);word-wrap:break-word;white-space:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   To ensure precise accuracy in time determination these actions should
   be done as close to the physical layer as possible at the same point
   of packet processing striving to avoid introducing the appearance of
   jitter in propogation delay whereas it should be accounted as
   residence time. </pre><pre style=3D"color:rgb(0,0,0);word-wrap:break-wor=
d;white-space:pre-wrap">Regards,</pre><pre style=3D"color:rgb(0,0,0);word-w=
rap:break-word;white-space:pre-wrap">Greg</pre></div></div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On Wed, Feb 15, 2017 at 11:15 AM,=
 Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.com=
" target=3D"_blank">rjsparks@nostrum.com</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000"><span class=3D"">
    <p><br>
    </p>
    <br>
    <div class=3D"m_2800513769154960288moz-cite-prefix">On 2/15/17 11:20 AM=
, Greg Mirsky wrote:<br>
    </div>
    </span><blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Robert,
        <span class=3D""><div>yes, you&#39;ve absolutely correct in your ex=
ample. The
          importance of RTM is to exclude and quantify, as much as
          possible, jitter from propagation delay. I&#39;ve updated the
          wording to reflect that. Below is new text I propose, please
          let me know if it makes it clearer.</div>
        <div>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.</pre>
        </div>
      </span></div>
    </blockquote>
    perhaps change &quot;avoid introduction of jitter&quot; to &quot;avoid =
introducing
    the appearance of jitter that&#39;s not really there&quot;?<br>
    <br>
    (I&#39;m about to board a plane, so further responses will be very
    delayed). <br><div><div class=3D"h5">
    <blockquote type=3D"cite">
      <div dir=3D"ltr">
        <div>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Regards,</pre>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Greg</pre>
        </div>
      </div>
      <div class=3D"gmail_extra"><br>
        <div class=3D"gmail_quote">On Wed, Feb 15, 2017 at 7:43 AM, Robert
          Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.c=
om" target=3D"_blank">rjsparks@nostrum.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">
            <div bgcolor=3D"#FFFFFF" text=3D"#000000"><span>
                <p><br>
                </p>
                <br>
                <div class=3D"m_2800513769154960288m_3072934530585377958moz=
-cite-prefix">On
                  2/14/17 10:06 PM, Greg Mirsky wrote:<br>
                </div>
                <blockquote type=3D"cite">
                  <div dir=3D"ltr">Hi Robert,
                    <div>Section 5 Data Plane Theory of Operation has
                      the following recommendation on reading time value
                      at ingress and egress:</div>
                    <div>
                      <pre class=3D"m_2800513769154960288m_3072934530585377=
958gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom=
:0px;color:rgb(0,0,0)">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
                      <pre class=3D"m_2800513769154960288m_3072934530585377=
958gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom=
:0px;color:rgb(0,0,0)">Do you find the text sufficient in providing guidanc=
e to an implementer of RTM?</pre>
                    </div>
                  </div>
                </blockquote>
              </span> Well, no - that was point in the text from my
              review of -12 that caused me to make comment in the first
              place.<br>
              <br>
              What does &quot;precise accuracy&quot; even _MEAN_? You&#39;r=
e waving
              your hands with words that don&#39;t help the reader guess
              what you mean at the moment. The subsequent email exchange
              said the important part was that you measure _precisely_
              (in that the measurements are always taken the same way),
              but accuracy isn&#39;t that important (you&#39;ve (and here b=
y
              &quot;you&quot; I mean the set of people that have responded =
to the
              review&quot;) told me it&#39;s not important whether the read=
ing is
              taken at the beginning of the bit-stream, the end, or
              several 1000 nanoseconds after the last bit came off the
              physical media as long as it&#39;s done the same way for each
              packet). The fact that you&#39;re carrying a measurement that
              can talk about times smaller than the interarrival time
              for individual bits for some real world line speeds says
              that different implementations taking the measurement
              different ways is going to result in different residence
              time measurements, even if the residence time was really
              identical. You&#39;ve told me that&#39;s not important to the
              protocol using the measurement as long as the an
              individual implementation doesn&#39;t introduce something tha=
t
              will look to the using protocol like jitter that&#39;s not
              really there.<br>
              <br>
              The text does not say that to an implementer right now.<br>
              <br>
              To restate that long paragraph with maybe a longer one,=C2=A0
              assume a simplified world where everything is perfectly
              constant. Packets are all flowing at the same size and
              same rate. For reference, I assert that the time between
              the first bit of a packet entering the system taking the
              measurement and the first bit of that packet leaving the
              system is exactly T (every time). You are telling me that
              if the system returns cT for some constant T other than 1
              (and not necessarily=C2=A0 close to 1), everything is fine.
              You&#39;re also telling me that if you replace the system wit=
h
              another that preserves T, but measures differently so that
              it returns c&#39;T where c&#39; !=3D c, everything is fine. T=
he
              important part to you is that c and c&#39; don&#39;t change f=
or
              their respective systems. (That surprises me, I can see
              how the way the clocks are going to use this will do the
              right thing, but I can&#39;t help but think someone later wil=
l
              look at the difference between the two systems and say
              something is wrong with one of them). What you&#39;ve told me
              is not fine is that if you drop i a third system that also
              preserves T but reports aT where a _varies_ over some
              range.<br>
              <br>
              Have I heard you correctly?<span><br>
                <blockquote type=3D"cite">
                  <div dir=3D"ltr">
                    <div>
                      <pre class=3D"m_2800513769154960288m_3072934530585377=
958gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom=
:0px;color:rgb(0,0,0)">Regards,</pre>
                      <pre class=3D"m_2800513769154960288m_3072934530585377=
958gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-bottom=
:0px;color:rgb(0,0,0)">Greg</pre>
                    </div>
                  </div>
                  <div class=3D"gmail_extra"><br>
                    <div class=3D"gmail_quote">On Mon, Feb 13, 2017 at
                      1:51 PM, Robert Sparks <span dir=3D"ltr">&lt;<a href=
=3D"mailto:rjsparks@nostrum.com" target=3D"_blank">rjsparks@nostrum.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">Reviewer: Robert Spark=
s<br>
                        Review result: Ready<br>
                        <br>
                        I am the assigned Gen-ART reviewer for this
                        draft. The General Area<br>
                        Review Team (Gen-ART) reviews all IETF documents
                        being processed<br>
                        by the IESG for the IETF Chair. Please wait for
                        direction from your<br>
                        document shepherd or AD before posting a new
                        version of the draft.<br>
                        <br>
                        For more information, please see the FAQ at<br>
                        <br>
                        &lt;<a href=3D"https://trac.ietf.org/trac/gen/wiki/=
GenArtfaq" rel=3D"noreferrer" target=3D"_blank">https://trac.ietf.org/trac/=
ge<wbr>n/wiki/GenArtfaq</a>&gt;.<br>
                        <br>
                        Document: draft-ietf-mpls-residence-time<wbr>-13<br=
>
                        Reviewer: Robert Sparks<br>
                        Review Date: 2017-02-13<br>
                        IETF LC End Date: 2017-01-17<br>
                        IESG Telechat date: 2017-03-02<br>
                        <br>
                        Summary: Ready for publication as PS<br>
                        <br>
                        Thanks for addressing my comments.<br>
                        (I still think some discussion about taking
                        arrival and departure time<br>
                        measurements would be helpful, even if it only
                        said &quot;do it<br>
                        consistently so you don&#39;t indicate jitter that&=
#39;s
                        not really there&quot;.)<br>
                        <br>
                      </blockquote>
                    </div>
                    <br>
                  </div>
                </blockquote>
                <br>
              </span></div>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </div></div></div>

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

--001a1141b0a0eb4d66054897b029--


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Subject: Re: [mpls] [Gen-art] Review of draft-ietf-mpls-tp-linear-protection-mib-11
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All: thanks for the review and discussion. I plan to vote =93no-objection=94=
 for this document in tonight=92s IESG telechat.

Jari


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Benoit Claise has entered the following ballot position for
draft-ietf-mpls-tp-linear-protection-mib-11: No Objection

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The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-linear-protection-mib/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Some editorial changes are agreed upon, triggered by our OPS DIR reviewer
Qin Wu.



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From: <N.Leymann@telekom.de>
To: <martin.vigoureux@nokia.com>, <mpls@ietf.org>
Thread-Topic: Closed: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed
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Subject: [mpls] Closed:  2nd WG LC on draft-ietf-mpls-bfd-directed
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Hi,

The 2nd WG LC on draft-ietf-mpls-bfd-directed is closed now.=20
=09
regards

Nic

-----Urspr=FCngliche Nachricht-----
Von: mpls [mailto:mpls-bounces@ietf.org] Im Auftrag von Martin Vigoureux
Gesendet: Sonntag, 10. Juli 2016 20:00
An: mpls@ietf.org
Betreff: [mpls] 2nd WG LC on draft-ietf-mpls-bfd-directed

WG,

as said by Ross [1], I have been appointed Document Shepherd for draft-ietf=
-mpls-bfd-directed [2]. As such I am also running the second WG LC.

So, this e-mail starts a WG LC which will end on the 31st of July.

I'd like to remind that an IPR disclosure [3] exists against this document.

So it is time to state whether or not you are in favour of progressing the =
document. Please also take the time to review the document and post comment=
s on its content.

Please respond to this call.

Thank you

Martin


[1]: https://mailarchive.ietf.org/arch/msg/mpls/rxnEv4LnUiwhTiZOhowOC6AcHYU
[2]: https://datatracker.ietf.org/doc/draft-ietf-mpls-bfd-directed/
[2]: https://datatracker.ietf.org/ipr/2769/

_______________________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls


From nobody Fri Feb 17 02:12:30 2017
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Subject: [mpls] I-D Action: draft-ietf-mpls-tp-linear-protection-mib-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 Multiprotocol Label Switching of the IETF.

        Title           : MPLS Transport Profile Linear Protection MIB
        Authors         : Kingston Smiler Selvaraj
                          Venkatesan Mahalingam
                          Daniel King
                          Sam Aldrin
                          Jeong-dong Ryoo
	Filename        : draft-ietf-mpls-tp-linear-protection-mib-12.txt
	Pages           : 44
	Date            : 2017-02-17

Abstract:
   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols.  In particular it defines
   objects for managing Multiprotocol Label Switching-Transport Profile
   (MPLS-TP) Linear Protection.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-linear-protection-mib/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-tp-linear-protection-mib-12

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https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-tp-linear-protection-mib-12


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From: <N.Leymann@telekom.de>
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--_000_03af7847dc014c688abfa283fdf05711HE105662emea1cdstintern_
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Hi,

I have closed the WG last call for the old version draft-ietf-mpls-bfd-dire=
cted. There is a new version available which addresses the concerns raised =
during the 2nd Last Call. The plan to progress the draft is the following:

  - Do a shepherd review and update the draft if necessary
  - Issue a new working group last call
  - QA review
  - Shepherd write up and publication

I hope this solves the open issues we had in the past.

regards

Nic


--_000_03af7847dc014c688abfa283fdf05711HE105662emea1cdstintern_
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<head>
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>
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<body>
<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Hi,</div>
<div>&nbsp;</div>
<div>I have closed the WG last call for the old version draft-ietf-mpls-bfd=
-directed. There is a new version available which addresses the concerns ra=
ised during the 2<font size=3D"1"><span style=3D"font-size:7.3pt;"><sup>nd<=
/sup></span></font> Last Call. The plan
to progress the draft is the following:</div>
<div>&nbsp;</div>
<div>&nbsp; - Do a shepherd review and update the draft if necessary</div>
<div>&nbsp; - Issue a new working group last call</div>
<div>&nbsp; - QA review</div>
<div>&nbsp; - Shepherd write up and publication</div>
<div>&nbsp;</div>
<div>I hope this solves the open issues we had in the past.</div>
<div>&nbsp;</div>
<div>regards</div>
<div>&nbsp;</div>
<div>Nic</div>
<div>&nbsp;</div>
</span></font>
</body>
</html>

--_000_03af7847dc014c688abfa283fdf05711HE105662emea1cdstintern_--


From nobody Fri Feb 17 08:36:46 2017
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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 Multiprotocol Label Switching of the IETF.

        Title           : LDP Extensions to Support Maximally Redundant Trees
        Authors         : Alia Atlas
                          Kishore Tiruveedhula
                          Chris Bowers
                          Jeff Tantsura
                          IJsbrand Wijnands
	Filename        : draft-ietf-mpls-ldp-mrt-05.txt
	Pages           : 18
	Date            : 2017-02-17

Abstract:
   This document specifies extensions to the Label Distribution
   Protocol(LDP) to support the creation of label-switched paths for
   Maximally Redundant Trees (MRT).  A prime use of MRTs is for unicast
   and multicast IP/LDP Fast-Reroute, which we will refer to as MRT-FRR.

   The sole protocol extension to LDP is simply the ability to advertise
   an MRT Capability.  This document describes that extension and the
   associated behavior expected for LSRs (Label Switching Routers) and
   LERs (Label Edge Routers) advertising the MRT Capability.

   MRT-FRR uses LDP multi-topology extensions and requires three
   different multi-topology IDs to be allocated from the MPLS MT-ID
   space.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-ldp-mrt/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-ldp-mrt-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ldp-mrt-05


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.

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ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Feb 17 09:49:25 2017
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 17 Feb 2017 09:49:21 -0800
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--001a113de6e29f0cfa0548bd88bc
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Hi Nic,
thank you for the detailed plan of actions regarding this work. Authors are
fully committed to progress the draft

Regards,
Greg

On Fri, Feb 17, 2017 at 6:42 AM, <N.Leymann@telekom.de> wrote:

> Hi,
>
> I have closed the WG last call for the old version
> draft-ietf-mpls-bfd-directed. There is a new version available which
> addresses the concerns raised during the 2nd Last Call. The plan to
> progress the draft is the following:
>
>   - Do a shepherd review and update the draft if necessary
>   - Issue a new working group last call
>   - QA review
>   - Shepherd write up and publication
>
> I hope this solves the open issues we had in the past.
>
> regards
>
> Nic
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>

--001a113de6e29f0cfa0548bd88bc
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<div dir=3D"ltr">Hi Nic,<div>thank you for the detailed plan of actions reg=
arding this work. Authors are fully committed to progress the draft=C2=A0</=
div><div><br></div><div>Regards,</div><div>Greg</div></div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On Fri, Feb 17, 2017 at 6:42 AM, =
 <span dir=3D"ltr">&lt;<a href=3D"mailto:N.Leymann@telekom.de" target=3D"_b=
lank">N.Leymann@telekom.de</a>&gt;</span> wrote:<br><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">






<div>
<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt">
<div>Hi,</div>
<div>=C2=A0</div>
<div>I have closed the WG last call for the old version draft-ietf-mpls-bfd=
-directed. There is a new version available which addresses the concerns ra=
ised during the 2<font size=3D"1"><span style=3D"font-size:7.3pt"><sup>nd</=
sup></span></font> Last Call. The plan
to progress the draft is the following:</div>
<div>=C2=A0</div>
<div>=C2=A0 - Do a shepherd review and update the draft if necessary</div>
<div>=C2=A0 - Issue a new working group last call</div>
<div>=C2=A0 - QA review</div>
<div>=C2=A0 - Shepherd write up and publication</div>
<div>=C2=A0</div>
<div>I hope this solves the open issues we had in the past.</div>
<div>=C2=A0</div>
<div>regards</div>
<div>=C2=A0</div>
<div>Nic</div>
<div>=C2=A0</div>
</span></font>
</div>

<br>______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org">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/<wbr>listinfo/mpls</a><br>
<br></blockquote></div><br></div>

--001a113de6e29f0cfa0548bd88bc--


From nobody Fri Feb 17 12:29:12 2017
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Subject: [mpls] Last Call: <draft-ietf-mpls-tp-temporal-hitless-psm-12.txt> (Hitless path segment monitoring) to Informational RFC
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The IESG has received a request from the Multiprotocol Label Switching WG
(mpls) to consider the following document:
- 'Hitless path segment monitoring'
  <draft-ietf-mpls-tp-temporal-hitless-psm-12.txt> as Informational RFC

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2017-03-03. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   One of the most important OAM capabilities for transport network
   operation is fault localisation.  An in-service, on-demand segment
   monitoring function of a transport path is indispensable,
   particularly when the service monitoring function is activated only
   between end points.  However, the current segment monitoring approach
   defined for MPLS (including the transport profile (MPLS-TP)) in RFC
   6371 [RFC6371] has drawbacks.  This document provides an analysis of
   the existing MPLS-TP OAM mechanisms for the path segment monitoring
   and provides requirements to guide the development of new OAM tools
   to support a Hitless Path Segment Monitoring (HPSM).




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-temporal-hitless-psm/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-temporal-hitless-psm/ballot/


No IPR declarations have been submitted directly on this I-D.





From nobody Mon Feb 20 20:18:26 2017
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From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] Closed -- Re: Working Group Last Call on draft-ietf-mpls-flow-ident
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Working Group,

This working group last call is closed.

Authors.

There were comments, can you please update and post a new version!

/Loa
mpls wg co-chair



On 2017-01-23 11:35, Loa Andersson wrote:
> Working Group,
>
> This is to initiate a two week working group last call on
> draft-ietf-mpls-flow-ident-02.
>
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
>
> There were no IPR disclosures against this document.
>
> All the authors and contributors have stated on the working group
> mailing list that they are not aware of any IPRs that relates to this
> document.
>
> This working group last call ends February 6, 2017.
>
>
> /Loa
> for the MPLS wg chairs

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Feb 21 00:27:49 2017
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Subject: [mpls] I-D Action: draft-ietf-mpls-tp-mfp-use-case-and-requirements-03.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 Multiprotocol Label Switching of the IETF.

        Title           : Use Cases and Requirements for MPLS-TP multi-failure protection
        Authors         : Zhenlong Cui
                          Rolf Winter
                          Himanshu Shah
                          Sam Aldrin
                          Masahiro Daikoku
	Filename        : draft-ietf-mpls-tp-mfp-use-case-and-requirements-03.txt
	Pages           : 9
	Date            : 2017-02-21

Abstract:
   For the Multiprotocol Label Switching Transport Profile (MPLS-TP)
   linear protection capable of 1+1 and 1:1 protection has already been
   defined.  That linear protection mechanism has not been designed for
   handling multiple, simultaneously occuring failures, i.e. multiple
   failures that affect the working and the protection entity during the
   same time period.  In these situations currently defined protection
   mechanisms would fail.

   This document introduces use cases and requirements for mechanisms
   that are capable of protecting against such failures.  It does not
   specify a multi-failure protection mechanism itself.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-mfp-use-case-and-requirements/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-tp-mfp-use-case-and-requirements-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-tp-mfp-use-case-and-requirements-03


Please note that it may take a couple of minutes from the time of submission
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From nobody Tue Feb 21 10:26:57 2017
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Subject: [mpls] Protocol Action: 'MPLS Transport Profile Linear Protection MIB' to Proposed Standard (draft-ietf-mpls-tp-linear-protection-mib-12.txt)
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The IESG has approved the following document:
- 'MPLS Transport Profile Linear Protection MIB'
  (draft-ietf-mpls-tp-linear-protection-mib-12.txt) as Proposed Standard

This document is the product of the Multiprotocol Label Switching Working
Group.

The IESG contact persons are Alvaro Retana, Alia Atlas and Deborah
Brungard.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-linear-protection-mib/





Technical Summary

This memo defines objects for managing MPLS-Transport Profile 
(MPLS-TP) Linear Protection.

 This MIB module should be used for configuring and managing the MPLS-
 TP linear protection for MPLS-TP Label Switched Paths (LSPs). 

Working Group Summary

The interest in MPLS-TP is slightly waning, however there is a
rather strong group within the working group working on the last
MPLS-TP documents. The MPLS WG is also committed to complete the
MPLS-TP project. This document has been greatly improved in the
reviews during the working group process. 

Document Quality

We know of a handful of implementations (or intent to implement).
It was reviewed by the MIB-DOCTORS.

Personnel

   Who is the Document Shepherd for this document?  Loa Andersson
   Who is the Responsible Area Director?  Deborah Brungard


From nobody Tue Feb 21 18:56:09 2017
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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 Multiprotocol Label Switching of the IETF.

        Title           : Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in Automatic Protection Switching (APS) Mode
        Authors         : Jeong-dong Ryoo
                          Taesik Cheung
                          Huub van Helvoort
                          Italo Busi
                          Guangjuan Wen
	Filename        : draft-ietf-mpls-tp-aps-updates-03.txt
	Pages           : 9
	Date            : 2017-02-21

Abstract:
   This document contains updates to MPLS Transport Profile (MPLS-TP)
   linear protection in Automatic Protection Switching (APS) mode
   defined in RFC 7271.  The updates provide rules related to the
   initialization of the Protection State Coordination (PSC) Control
   Logic, in which the state machine resides, when operating in APS
   mode, and clarify some operation related to state transition table
   lookup.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-tp-aps-updates/

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https://tools.ietf.org/html/draft-ietf-mpls-tp-aps-updates-03

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ftp://ftp.ietf.org/internet-drafts/


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Subject: Re: [mpls] RtgDir review: draft-ietf-mpls-tp-aps-updates-02.txt
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From: Robert Sparks <rjsparks@nostrum.com>
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Date: Wed, 22 Feb 2017 10:09:01 +0100
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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I would simply delete "To ensure precise accuracy in time determination" 
and start the sentence at "These actions"

RjS


On 2/15/17 9:40 PM, Greg Mirsky wrote:
> Hi Robert,
> safe travel and here's another version for your consideration. The 
> point I'm trying to convey is that the jitter is real but must be 
> accounted not as part of propagation delay but as residence time. Hope 
> I'm getting close.
>     Each RTM-capable
>     node on the explicit path receives an RTM packet and records the time
>     at which it receives that packet at its ingress interface as well as
>     the time at which it transmits that packet from its egress interface.
>     To ensure precise accuracy in time determination these actions should
>     be done as close to the physical layer as possible at the same point
>     of packet processing striving to avoid introducing the appearance of
>     jitter in propogation delay whereas it should be accounted as
>     residence time.
> Regards,
> Greg
>
> On Wed, Feb 15, 2017 at 11:15 AM, Robert Sparks <rjsparks@nostrum.com 
> <mailto:rjsparks@nostrum.com>> wrote:
>
>
>
>     On 2/15/17 11:20 AM, Greg Mirsky wrote:
>>     Hi Robert,
>>     yes, you've absolutely correct in your example. The importance of
>>     RTM is to exclude and quantify, as much as possible, jitter from
>>     propagation delay. I've updated the wording to reflect that.
>>     Below is new text I propose, please let me know if it makes it
>>     clearer.
>>         Each RTM-capable
>>         node on the explicit path receives an RTM packet and records the time
>>         at which it receives that packet at its ingress interface as well as
>>         the time at which it transmits that packet from its egress interface.
>>         These actions should be done as close to the physical layer as
>>         possible at the same point of packet processing striving to avoid
>>         introduction of jitter in propogation delay to ensure precise
>>         accuracy in time determination.
>     perhaps change "avoid introduction of jitter" to "avoid
>     introducing the appearance of jitter that's not really there"?
>
>     (I'm about to board a plane, so further responses will be very
>     delayed).
>>     Regards,
>>     Greg
>>
>>     On Wed, Feb 15, 2017 at 7:43 AM, Robert Sparks
>>     <rjsparks@nostrum.com <mailto:rjsparks@nostrum.com>> wrote:
>>
>>
>>
>>         On 2/14/17 10:06 PM, Greg Mirsky wrote:
>>>         Hi Robert,
>>>         Section 5 Data Plane Theory of Operation has the following
>>>         recommendation on reading time value at ingress and egress:
>>>             Each RTM-capable
>>>             node on the explicit path receives an RTM packet and records the time
>>>             at which it receives that packet at its ingress interface as well as
>>>             the time at which it transmits that packet from its egress interface;
>>>             this should be done as close to the physical layer as possible to
>>>             ensure precise accuracy in time determination.
>>>         Do you find the text sufficient in providing guidance to an implementer of RTM?
>>         Well, no - that was point in the text from my review of -12
>>         that caused me to make comment in the first place.
>>
>>         What does "precise accuracy" even _MEAN_? You're waving your
>>         hands with words that don't help the reader guess what you
>>         mean at the moment. The subsequent email exchange said the
>>         important part was that you measure _precisely_ (in that the
>>         measurements are always taken the same way), but accuracy
>>         isn't that important (you've (and here by "you" I mean the
>>         set of people that have responded to the review") told me
>>         it's not important whether the reading is taken at the
>>         beginning of the bit-stream, the end, or several 1000
>>         nanoseconds after the last bit came off the physical media as
>>         long as it's done the same way for each packet). The fact
>>         that you're carrying a measurement that can talk about times
>>         smaller than the interarrival time for individual bits for
>>         some real world line speeds says that different
>>         implementations taking the measurement different ways is
>>         going to result in different residence time measurements,
>>         even if the residence time was really identical. You've told
>>         me that's not important to the protocol using the measurement
>>         as long as the an individual implementation doesn't introduce
>>         something that will look to the using protocol like jitter
>>         that's not really there.
>>
>>         The text does not say that to an implementer right now.
>>
>>         To restate that long paragraph with maybe a longer one, 
>>         assume a simplified world where everything is perfectly
>>         constant. Packets are all flowing at the same size and same
>>         rate. For reference, I assert that the time between the first
>>         bit of a packet entering the system taking the measurement
>>         and the first bit of that packet leaving the system is
>>         exactly T (every time). You are telling me that if the system
>>         returns cT for some constant T other than 1 (and not
>>         necessarily  close to 1), everything is fine. You're also
>>         telling me that if you replace the system with another that
>>         preserves T, but measures differently so that it returns c'T
>>         where c' != c, everything is fine. The important part to you
>>         is that c and c' don't change for their respective systems.
>>         (That surprises me, I can see how the way the clocks are
>>         going to use this will do the right thing, but I can't help
>>         but think someone later will look at the difference between
>>         the two systems and say something is wrong with one of them).
>>         What you've told me is not fine is that if you drop i a third
>>         system that also preserves T but reports aT where a _varies_
>>         over some range.
>>
>>         Have I heard you correctly?
>>>         Regards,
>>>         Greg
>>>
>>>         On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks
>>>         <rjsparks@nostrum.com <mailto:rjsparks@nostrum.com>> wrote:
>>>
>>>             Reviewer: Robert Sparks
>>>             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
>>>             <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>>.
>>>
>>>             Document: draft-ietf-mpls-residence-time-13
>>>             Reviewer: Robert Sparks
>>>             Review Date: 2017-02-13
>>>             IETF LC End Date: 2017-01-17
>>>             IESG Telechat date: 2017-03-02
>>>
>>>             Summary: Ready for publication as PS
>>>
>>>             Thanks for addressing my comments.
>>>             (I still think some discussion about taking arrival and
>>>             departure time
>>>             measurements would be helpful, even if it only said "do it
>>>             consistently so you don't indicate jitter that's not
>>>             really there".)
>>>
>>>
>>
>>
>
>


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    <p>I would simply delete "To ensure precise accuracy in time
      determination" and start the sentence at "These actions"</p>
    <p>RjS<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 2/15/17 9:40 PM, Greg Mirsky wrote:<br>
    </div>
    <blockquote
cite="mid:CA+RyBmUzP9rDdq9un08GnY0Dzcq+0w-ty1_Fg=kGGHZ3af8JJQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hi Robert,
        <div>safe travel and here's another version for your
          consideration. The point I'm trying to convey is that the
          jitter is real but must be accounted not as part of
          propagation delay but as residence time. Hope I'm getting
          close.</div>
        <div>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   To ensure precise accuracy in time determination these actions should
   be done as close to the physical layer as possible at the same point
   of packet processing striving to avoid introducing the appearance of
   jitter in propogation delay whereas it should be accounted as
   residence time. </pre>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Regards,</pre>
          <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Greg</pre>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Feb 15, 2017 at 11:15 AM,
          Robert Sparks <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:rjsparks@nostrum.com" target="_blank">rjsparks@nostrum.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 bgcolor="#FFFFFF" text="#000000"><span class="">
                <p><br>
                </p>
                <br>
                <div class="m_2800513769154960288moz-cite-prefix">On
                  2/15/17 11:20 AM, Greg Mirsky wrote:<br>
                </div>
              </span>
              <blockquote type="cite">
                <div dir="ltr">Hi Robert, <span class="">
                    <div>yes, you've absolutely correct in your example.
                      The importance of RTM is to exclude and quantify,
                      as much as possible, jitter from propagation
                      delay. I've updated the wording to reflect that.
                      Below is new text I propose, please let me know if
                      it makes it clearer.</div>
                    <div>
                      <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.</pre>
                    </div>
                  </span></div>
              </blockquote>
              perhaps change "avoid introduction of jitter" to "avoid
              introducing the appearance of jitter that's not really
              there"?<br>
              <br>
              (I'm about to board a plane, so further responses will be
              very delayed). <br>
              <div>
                <div class="h5">
                  <blockquote type="cite">
                    <div dir="ltr">
                      <div>
                        <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Regards,</pre>
                        <pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap">Greg</pre>
                      </div>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">On Wed, Feb 15, 2017 at
                        7:43 AM, Robert Sparks <span dir="ltr">&lt;<a
                            moz-do-not-send="true"
                            href="mailto:rjsparks@nostrum.com"
                            target="_blank">rjsparks@nostrum.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 bgcolor="#FFFFFF" text="#000000"><span>
                              <p><br>
                              </p>
                              <br>
                              <div
                                class="m_2800513769154960288m_3072934530585377958moz-cite-prefix">On
                                2/14/17 10:06 PM, Greg Mirsky wrote:<br>
                              </div>
                              <blockquote type="cite">
                                <div dir="ltr">Hi Robert,
                                  <div>Section 5 Data Plane Theory of
                                    Operation has the following
                                    recommendation on reading time value
                                    at ingress and egress:</div>
                                  <div>
                                    <pre class="m_2800513769154960288m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
                                    <pre class="m_2800513769154960288m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you find the text sufficient in providing guidance to an implementer of RTM?</pre>
                                  </div>
                                </div>
                              </blockquote>
                            </span> Well, no - that was point in the
                            text from my review of -12 that caused me to
                            make comment in the first place.<br>
                            <br>
                            What does "precise accuracy" even _MEAN_?
                            You're waving your hands with words that
                            don't help the reader guess what you mean at
                            the moment. The subsequent email exchange
                            said the important part was that you measure
                            _precisely_ (in that the measurements are
                            always taken the same way), but accuracy
                            isn't that important (you've (and here by
                            "you" I mean the set of people that have
                            responded to the review") told me it's not
                            important whether the reading is taken at
                            the beginning of the bit-stream, the end, or
                            several 1000 nanoseconds after the last bit
                            came off the physical media as long as it's
                            done the same way for each packet). The fact
                            that you're carrying a measurement that can
                            talk about times smaller than the
                            interarrival time for individual bits for
                            some real world line speeds says that
                            different implementations taking the
                            measurement different ways is going to
                            result in different residence time
                            measurements, even if the residence time was
                            really identical. You've told me that's not
                            important to the protocol using the
                            measurement as long as the an individual
                            implementation doesn't introduce something
                            that will look to the using protocol like
                            jitter that's not really there.<br>
                            <br>
                            The text does not say that to an implementer
                            right now.<br>
                            <br>
                            To restate that long paragraph with maybe a
                            longer one,Â  assume a simplified world where
                            everything is perfectly constant. Packets
                            are all flowing at the same size and same
                            rate. For reference, I assert that the time
                            between the first bit of a packet entering
                            the system taking the measurement and the
                            first bit of that packet leaving the system
                            is exactly T (every time). You are telling
                            me that if the system returns cT for some
                            constant T other than 1 (and not
                            necessarilyÂ  close to 1), everything is
                            fine. You're also telling me that if you
                            replace the system with another that
                            preserves T, but measures differently so
                            that it returns c'T where c' != c,
                            everything is fine. The important part to
                            you is that c and c' don't change for their
                            respective systems. (That surprises me, I
                            can see how the way the clocks are going to
                            use this will do the right thing, but I
                            can't help but think someone later will look
                            at the difference between the two systems
                            and say something is wrong with one of
                            them). What you've told me is not fine is
                            that if you drop i a third system that also
                            preserves T but reports aT where a _varies_
                            over some range.<br>
                            <br>
                            Have I heard you correctly?<span><br>
                              <blockquote type="cite">
                                <div dir="ltr">
                                  <div>
                                    <pre class="m_2800513769154960288m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Regards,</pre>
                                    <pre class="m_2800513769154960288m_3072934530585377958gmail-newpage" style="font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre>
                                  </div>
                                </div>
                                <div class="gmail_extra"><br>
                                  <div class="gmail_quote">On Mon, Feb
                                    13, 2017 at 1:51 PM, Robert Sparks <span
                                      dir="ltr">&lt;<a
                                        moz-do-not-send="true"
                                        href="mailto:rjsparks@nostrum.com"
                                        target="_blank">rjsparks@nostrum.com</a>&gt;</span>
                                    wrote:<br>
                                    <blockquote class="gmail_quote"
                                      style="margin:0 0 0
                                      .8ex;border-left:1px #ccc
                                      solid;padding-left:1ex">Reviewer:
                                      Robert Sparks<br>
                                      Review result: Ready<br>
                                      <br>
                                      I am the assigned Gen-ART reviewer
                                      for this draft. The General Area<br>
                                      Review Team (Gen-ART) reviews all
                                      IETF documents being processed<br>
                                      by the IESG for the IETF Chair.
                                      Please wait for direction from
                                      your<br>
                                      document shepherd or AD before
                                      posting a new version of the
                                      draft.<br>
                                      <br>
                                      For more information, please see
                                      the FAQ at<br>
                                      <br>
                                      &lt;<a moz-do-not-send="true"
                                        href="https://trac.ietf.org/trac/gen/wiki/GenArtfaq"
                                        rel="noreferrer" target="_blank">https://trac.ietf.org/trac/ge<wbr>n/wiki/GenArtfaq</a>&gt;.<br>
                                      <br>
                                      Document:
                                      draft-ietf-mpls-residence-time<wbr>-13<br>
                                      Reviewer: Robert Sparks<br>
                                      Review Date: 2017-02-13<br>
                                      IETF LC End Date: 2017-01-17<br>
                                      IESG Telechat date: 2017-03-02<br>
                                      <br>
                                      Summary: Ready for publication as
                                      PS<br>
                                      <br>
                                      Thanks for addressing my comments.<br>
                                      (I still think some discussion
                                      about taking arrival and departure
                                      time<br>
                                      measurements would be helpful,
                                      even if it only said "do it<br>
                                      consistently so you don't indicate
                                      jitter that's not really there".)<br>
                                      <br>
                                    </blockquote>
                                  </div>
                                  <br>
                                </div>
                              </blockquote>
                              <br>
                            </span></div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </blockquote>
                  <br>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
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Date: Wed, 22 Feb 2017 13:50:07 +0000 (UTC)
From: Naveen T <naveen.thanikachalam@yahoo.in>
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Subject: [mpls] Question regarding RFC 7260
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Dear Authors, et al.,
RFC 7260=C2=A0describes the procedures for OAM configuration and control vi=
a RSVP-TE.=C2=A0RFC 7467=C2=A0further extends this to provide procedures to=
 configure pro-active OAMs like BFD, FMS etc.=C2=A0
I have a query regarding the usage of RSVP-TE to carry the OAM configuratio=
ns from the MPLS-TP tunnel ingress to the tunnel egress.Considering that th=
e MPLS-TP bi-directional LSP has been established statically and the requir=
ement is to only signal the OAM entities, I have the following assumptions:=
  =20
   - An IGP path must be established between the MPLS-TP tunnel's ingress a=
nd egress LERs.
   - The MPLS-TP node_id of and LER/LSR, defined=C2=A0here, will also be co=
nfigured as that LER's/LSR's loopback interface's address.
   - The IGP will ensure that each LER/LSR learns about all the LSRs/LERs a=
long the MPLS-TP transport path.
   - RSVP-TE will use this IGP path to send/receive the PATH/RESV messages.

Are these assumptions correct?Or, should there be a GMPLS control-plane adj=
acency between LERs/LSRs along the MPLS-TP path with the TE links on these =
nodes acting as the MPLS-TP NNI interfaces?
Thanks and Regards,Naveen T




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<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, =
Sans-Serif;font-size:16px"><div id=3D"yiv3190523110"><div id=3D"yui_3_16_0_=
ym19_1_1487767882136_27819"><div style=3D"background-color: rgb(255, 255, 2=
55);" id=3D"yui_3_16_0_ym19_1_1487767882136_27818"><div id=3D"yiv3190523110=
yui_3_16_0_ym19_1_1487767882136_23187" style=3D"color: rgb(0, 0, 0); font-f=
amily: HelveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Arial, &quot;L=
ucida Grande&quot;, sans-serif; font-size: 16px;"><span></span></div><div s=
tyle=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &quot;Helvetica Ne=
ue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, sans-serif; font-siz=
e: 16px;"></div><div id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_231=
59" style=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &quot;Helveti=
ca Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, sans-serif; fon=
t-size: 16px;">Dear Authors, et al.,</div><div id=3D"yiv3190523110yui_3_16_=
0_ym19_1_1487767882136_23159" style=3D"color: rgb(0, 0, 0); font-family: He=
lveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Arial, &quot;Lucida Gra=
nde&quot;, sans-serif; font-size: 16px;"><br></div><div id=3D"yiv3190523110=
yui_3_16_0_ym19_1_1487767882136_23159" dir=3D"ltr" style=3D"color: rgb(0, 0=
, 0); font-family: HelveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Ar=
ial, &quot;Lucida Grande&quot;, sans-serif; font-size: 16px;"><a class=3D"e=
dited-link-editor" href=3D"https://tools.ietf.org/html/rfc7260" id=3D"yui_3=
_16_0_ym19_1_1487767882136_28300">RFC 7260</a>&nbsp;describes the procedure=
s for OAM configuration and control via RSVP-TE.&nbsp;<a class=3D"edited-li=
nk-editor" href=3D"https://tools.ietf.org/html/rfc7487" id=3D"yui_3_16_0_ym=
19_1_1487767882136_28448">RFC 7467</a>&nbsp;further extends this to provide=
 procedures to configure pro-active OAMs like BFD, FMS etc.&nbsp;</div><div=
 id=3D"yui_3_16_0_ym19_1_1487767882136_28460" style=3D"color: rgb(0, 0, 0);=
 font-family: HelveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Arial, =
&quot;Lucida Grande&quot;, sans-serif; font-size: 16px;"><br></div><div id=
=3D"yui_3_16_0_ym19_1_1487767882136_28460" style=3D"color: rgb(0, 0, 0); fo=
nt-family: HelveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Arial, &qu=
ot;Lucida Grande&quot;, sans-serif; font-size: 16px;">I have a query regard=
ing the usage of RSVP-TE to carry the OAM configurations from the MPLS-TP t=
unnel ingress to the tunnel egress.</div><div id=3D"yui_3_16_0_ym19_1_14877=
67882136_28460" style=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &=
quot;Helvetica Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, san=
s-serif; font-size: 16px;">Considering that the MPLS-TP bi-directional LSP =
has been established statically and the requirement is to only signal the O=
AM entities, I have the following assumptions:</div><ol dir=3D"ltr" id=3D"y=
ui_3_16_0_ym19_1_1487767882136_28824"><li id=3D"yui_3_16_0_ym19_1_148776788=
2136_28823">An IGP path must be established between the MPLS-TP tunnel's in=
gress and egress LERs.</li><li id=3D"yui_3_16_0_ym19_1_1487767882136_28823"=
>The MPLS-TP node_id of and LER/LSR, defined&nbsp;<a class=3D"edited-link-e=
ditor" href=3D"https://tools.ietf.org/html/rfc6370#section-4" id=3D"yui_3_1=
6_0_ym19_1_1487767882136_29525">here</a>, will also be configured as that L=
ER's/LSR's loopback interface's address.</li><li id=3D"yui_3_16_0_ym19_1_14=
87767882136_28823">The IGP will ensure that each LER/LSR learns about all t=
he LSRs/LERs along the MPLS-TP transport path.</li><li id=3D"yui_3_16_0_ym1=
9_1_1487767882136_28823">RSVP-TE will use this IGP path to send/receive the=
 PATH/RESV messages.</li></ol><div id=3D"yui_3_16_0_ym19_1_1487767882136_28=
491" style=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &quot;Helvet=
ica Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, sans-serif; fo=
nt-size: 16px;"><br></div><div id=3D"yui_3_16_0_ym19_1_1487767882136_28491"=
 style=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &quot;Helvetica =
Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, sans-serif; font-s=
ize: 16px;">Are these assumptions correct?</div><div id=3D"yui_3_16_0_ym19_=
1_1487767882136_28491" style=3D"color: rgb(0, 0, 0); font-family: Helvetica=
Neue, &quot;Helvetica Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quo=
t;, sans-serif; font-size: 16px;">Or, should there be a GMPLS control-plane=
 adjacency between LERs/LSRs along the MPLS-TP path with the TE links on th=
ese nodes acting as the MPLS-TP NNI interfaces?</div><div id=3D"yiv31905231=
10yui_3_16_0_ym19_1_1487767882136_23159" style=3D"color: rgb(0, 0, 0); font=
-family: HelveticaNeue, &quot;Helvetica Neue&quot;, Helvetica, Arial, &quot=
;Lucida Grande&quot;, sans-serif; font-size: 16px;"><br></div><div class=3D=
"yiv3190523110signature" id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136=
_23162" style=3D"color: rgb(0, 0, 0); font-family: HelveticaNeue, &quot;Hel=
vetica Neue&quot;, Helvetica, Arial, &quot;Lucida Grande&quot;, sans-serif;=
 font-size: 16px;"><span style=3D"font-style:italic;font-weight:bold;" id=
=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23161">Thanks and Regards,=
</span><div id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23165"><span=
 id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23164">Naveen T<br></sp=
an><div id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23207"><br></div=
></div></div></div><div id=3D"yui_3_16_0_ym19_1_1487767882136_29211"><br></=
div><div id=3D"yui_3_16_0_ym19_1_1487767882136_29065"><br></div></div></div=
></div></body></html>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 22 Feb 2017 06:22:48 -0800
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To: Robert Sparks <rjsparks@nostrum.com>
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Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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Hi Robert,
agreed. Thank you for your thorough review and the most helpful comments.
I'll upload the update shortly.

Regards,
Greg

On Wed, Feb 22, 2017 at 1:09 AM, Robert Sparks <rjsparks@nostrum.com> wrote:

> I would simply delete "To ensure precise accuracy in time determination"
> and start the sentence at "These actions"
>
> RjS
>
> On 2/15/17 9:40 PM, Greg Mirsky wrote:
>
> Hi Robert,
> safe travel and here's another version for your consideration. The point
> I'm trying to convey is that the jitter is real but must be accounted not
> as part of propagation delay but as residence time. Hope I'm getting close.
>
>    Each RTM-capable
>    node on the explicit path receives an RTM packet and records the time
>    at which it receives that packet at its ingress interface as well as
>    the time at which it transmits that packet from its egress interface.
>    To ensure precise accuracy in time determination these actions should
>    be done as close to the physical layer as possible at the same point
>    of packet processing striving to avoid introducing the appearance of
>    jitter in propogation delay whereas it should be accounted as
>    residence time.
>
> Regards,
>
> Greg
>
>
> On Wed, Feb 15, 2017 at 11:15 AM, Robert Sparks <rjsparks@nostrum.com>
> wrote:
>
>>
>>
>> On 2/15/17 11:20 AM, Greg Mirsky wrote:
>>
>> Hi Robert,
>> yes, you've absolutely correct in your example. The importance of RTM is
>> to exclude and quantify, as much as possible, jitter from propagation
>> delay. I've updated the wording to reflect that. Below is new text I
>> propose, please let me know if it makes it clearer.
>>
>>    Each RTM-capable
>>    node on the explicit path receives an RTM packet and records the time
>>    at which it receives that packet at its ingress interface as well as
>>    the time at which it transmits that packet from its egress interface.
>>    These actions should be done as close to the physical layer as
>>    possible at the same point of packet processing striving to avoid
>>    introduction of jitter in propogation delay to ensure precise
>>    accuracy in time determination.
>>
>> perhaps change "avoid introduction of jitter" to "avoid introducing the
>> appearance of jitter that's not really there"?
>>
>> (I'm about to board a plane, so further responses will be very delayed).
>>
>> Regards,
>>
>> Greg
>>
>>
>> On Wed, Feb 15, 2017 at 7:43 AM, Robert Sparks <rjsparks@nostrum.com>
>> wrote:
>>
>>>
>>>
>>> On 2/14/17 10:06 PM, Greg Mirsky wrote:
>>>
>>> Hi Robert,
>>> Section 5 Data Plane Theory of Operation has the following
>>> recommendation on reading time value at ingress and egress:
>>>
>>>    Each RTM-capable
>>>    node on the explicit path receives an RTM packet and records the time
>>>    at which it receives that packet at its ingress interface as well as
>>>    the time at which it transmits that packet from its egress interface;
>>>    this should be done as close to the physical layer as possible to
>>>    ensure precise accuracy in time determination.
>>>
>>> Do you find the text sufficient in providing guidance to an implementer of RTM?
>>>
>>> Well, no - that was point in the text from my review of -12 that caused
>>> me to make comment in the first place.
>>>
>>> What does "precise accuracy" even _MEAN_? You're waving your hands with
>>> words that don't help the reader guess what you mean at the moment. The
>>> subsequent email exchange said the important part was that you measure
>>> _precisely_ (in that the measurements are always taken the same way), but
>>> accuracy isn't that important (you've (and here by "you" I mean the set of
>>> people that have responded to the review") told me it's not important
>>> whether the reading is taken at the beginning of the bit-stream, the end,
>>> or several 1000 nanoseconds after the last bit came off the physical media
>>> as long as it's done the same way for each packet). The fact that you're
>>> carrying a measurement that can talk about times smaller than the
>>> interarrival time for individual bits for some real world line speeds says
>>> that different implementations taking the measurement different ways is
>>> going to result in different residence time measurements, even if the
>>> residence time was really identical. You've told me that's not important to
>>> the protocol using the measurement as long as the an individual
>>> implementation doesn't introduce something that will look to the using
>>> protocol like jitter that's not really there.
>>>
>>> The text does not say that to an implementer right now.
>>>
>>> To restate that long paragraph with maybe a longer one,  assume a
>>> simplified world where everything is perfectly constant. Packets are all
>>> flowing at the same size and same rate. For reference, I assert that the
>>> time between the first bit of a packet entering the system taking the
>>> measurement and the first bit of that packet leaving the system is exactly
>>> T (every time). You are telling me that if the system returns cT for some
>>> constant T other than 1 (and not necessarily  close to 1), everything is
>>> fine. You're also telling me that if you replace the system with another
>>> that preserves T, but measures differently so that it returns c'T where c'
>>> != c, everything is fine. The important part to you is that c and c' don't
>>> change for their respective systems. (That surprises me, I can see how the
>>> way the clocks are going to use this will do the right thing, but I can't
>>> help but think someone later will look at the difference between the two
>>> systems and say something is wrong with one of them). What you've told me
>>> is not fine is that if you drop i a third system that also preserves T but
>>> reports aT where a _varies_ over some range.
>>>
>>> Have I heard you correctly?
>>>
>>> Regards,
>>>
>>> Greg
>>>
>>>
>>> On Mon, Feb 13, 2017 at 1:51 PM, Robert Sparks <rjsparks@nostrum.com>
>>> wrote:
>>>
>>>> Reviewer: Robert Sparks
>>>> 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-mpls-residence-time-13
>>>> Reviewer: Robert Sparks
>>>> Review Date: 2017-02-13
>>>> IETF LC End Date: 2017-01-17
>>>> IESG Telechat date: 2017-03-02
>>>>
>>>> Summary: Ready for publication as PS
>>>>
>>>> Thanks for addressing my comments.
>>>> (I still think some discussion about taking arrival and departure time
>>>> measurements would be helpful, even if it only said "do it
>>>> consistently so you don't indicate jitter that's not really there".)
>>>>
>>>>
>>>
>>>
>>
>>
>
>

--94eb2c0931da251a7b05491f3b6d
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Robert,<div>agreed. Thank you for your thorough review =
and the most helpful comments. I&#39;ll upload the update shortly.</div><di=
v><br></div><div>Regards,</div><div>Greg</div></div><div class=3D"gmail_ext=
ra"><br><div class=3D"gmail_quote">On Wed, Feb 22, 2017 at 1:09 AM, Robert =
Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.com" target=
=3D"_blank">rjsparks@nostrum.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    <p>I would simply delete &quot;To ensure precise accuracy in time
      determination&quot; and start the sentence at &quot;These actions&quo=
t;</p>
    <p>RjS<br>
    </p><div><div class=3D"h5">
    <br>
    <div class=3D"m_-8072473529522433651moz-cite-prefix">On 2/15/17 9:40 PM=
, Greg Mirsky wrote:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Robert,
        <div>safe travel and here&#39;s another version for your
          consideration. The point I&#39;m trying to convey is that the
          jitter is real but must be accounted not as part of
          propagation delay but as residence time. Hope I&#39;m getting
          close.</div>
        <div>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   To ensure precise accuracy in time determination these actions should
   be done as close to the physical layer as possible at the same point
   of packet processing striving to avoid introducing the appearance of
   jitter in propogation delay whereas it should be accounted as
   residence time. </pre>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Regards,</pre>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Greg</pre>
        </div>
      </div>
      <div class=3D"gmail_extra"><br>
        <div class=3D"gmail_quote">On Wed, Feb 15, 2017 at 11:15 AM,
          Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@no=
strum.com" target=3D"_blank">rjsparks@nostrum.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">
            <div bgcolor=3D"#FFFFFF" text=3D"#000000"><span>
                <p><br>
                </p>
                <br>
                <div class=3D"m_-8072473529522433651m_2800513769154960288mo=
z-cite-prefix">On
                  2/15/17 11:20 AM, Greg Mirsky wrote:<br>
                </div>
              </span>
              <blockquote type=3D"cite">
                <div dir=3D"ltr">Hi Robert, <span>
                    <div>yes, you&#39;ve absolutely correct in your example=
.
                      The importance of RTM is to exclude and quantify,
                      as much as possible, jitter from propagation
                      delay. I&#39;ve updated the wording to reflect that.
                      Below is new text I propose, please let me know if
                      it makes it clearer.</div>
                    <div>
                      <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;w=
hite-space:pre-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   These actions should be done as close to the physical layer as
   possible at the same point of packet processing striving to avoid
   introduction of jitter in propogation delay to ensure precise
   accuracy in time determination.</pre>
                    </div>
                  </span></div>
              </blockquote>
              perhaps change &quot;avoid introduction of jitter&quot; to &q=
uot;avoid
              introducing the appearance of jitter that&#39;s not really
              there&quot;?<br>
              <br>
              (I&#39;m about to board a plane, so further responses will be
              very delayed). <br>
              <div>
                <div class=3D"m_-8072473529522433651h5">
                  <blockquote type=3D"cite">
                    <div dir=3D"ltr">
                      <div>
                        <pre style=3D"color:rgb(0,0,0);word-wrap:break-word=
;white-space:pre-wrap">Regards,</pre>
                        <pre style=3D"color:rgb(0,0,0);word-wrap:break-word=
;white-space:pre-wrap">Greg</pre>
                      </div>
                    </div>
                    <div class=3D"gmail_extra"><br>
                      <div class=3D"gmail_quote">On Wed, Feb 15, 2017 at
                        7:43 AM, Robert Sparks <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:rjsparks@nostrum.com" target=3D"_blank">rjsparks@nostrum.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 bgcolor=3D"#FFFFFF" text=3D"#000000"><span>
                              <p><br>
                              </p>
                              <br>
                              <div class=3D"m_-8072473529522433651m_2800513=
769154960288m_3072934530585377958moz-cite-prefix">On
                                2/14/17 10:06 PM, Greg Mirsky wrote:<br>
                              </div>
                              <blockquote type=3D"cite">
                                <div dir=3D"ltr">Hi Robert,
                                  <div>Section 5 Data Plane Theory of
                                    Operation has the following
                                    recommendation on reading time value
                                    at ingress and egress:</div>
                                  <div>
                                    <pre class=3D"m_-8072473529522433651m_2=
800513769154960288m_3072934530585377958gmail-newpage" style=3D"font-size:13=
.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">   Each RTM-capa=
ble
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface;
   this should be done as close to the physical layer as possible to
   ensure precise accuracy in time determination.  </pre>
                                    <pre class=3D"m_-8072473529522433651m_2=
800513769154960288m_3072934530585377958gmail-newpage" style=3D"font-size:13=
.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Do you find the =
text sufficient in providing guidance to an implementer of RTM?</pre>
                                  </div>
                                </div>
                              </blockquote>
                            </span> Well, no - that was point in the
                            text from my review of -12 that caused me to
                            make comment in the first place.<br>
                            <br>
                            What does &quot;precise accuracy&quot; even _ME=
AN_?
                            You&#39;re waving your hands with words that
                            don&#39;t help the reader guess what you mean a=
t
                            the moment. The subsequent email exchange
                            said the important part was that you measure
                            _precisely_ (in that the measurements are
                            always taken the same way), but accuracy
                            isn&#39;t that important (you&#39;ve (and here =
by
                            &quot;you&quot; I mean the set of people that h=
ave
                            responded to the review&quot;) told me it&#39;s=
 not
                            important whether the reading is taken at
                            the beginning of the bit-stream, the end, or
                            several 1000 nanoseconds after the last bit
                            came off the physical media as long as it&#39;s
                            done the same way for each packet). The fact
                            that you&#39;re carrying a measurement that can
                            talk about times smaller than the
                            interarrival time for individual bits for
                            some real world line speeds says that
                            different implementations taking the
                            measurement different ways is going to
                            result in different residence time
                            measurements, even if the residence time was
                            really identical. You&#39;ve told me that&#39;s=
 not
                            important to the protocol using the
                            measurement as long as the an individual
                            implementation doesn&#39;t introduce something
                            that will look to the using protocol like
                            jitter that&#39;s not really there.<br>
                            <br>
                            The text does not say that to an implementer
                            right now.<br>
                            <br>
                            To restate that long paragraph with maybe a
                            longer one,=C2=A0 assume a simplified world whe=
re
                            everything is perfectly constant. Packets
                            are all flowing at the same size and same
                            rate. For reference, I assert that the time
                            between the first bit of a packet entering
                            the system taking the measurement and the
                            first bit of that packet leaving the system
                            is exactly T (every time). You are telling
                            me that if the system returns cT for some
                            constant T other than 1 (and not
                            necessarily=C2=A0 close to 1), everything is
                            fine. You&#39;re also telling me that if you
                            replace the system with another that
                            preserves T, but measures differently so
                            that it returns c&#39;T where c&#39; !=3D c,
                            everything is fine. The important part to
                            you is that c and c&#39; don&#39;t change for t=
heir
                            respective systems. (That surprises me, I
                            can see how the way the clocks are going to
                            use this will do the right thing, but I
                            can&#39;t help but think someone later will loo=
k
                            at the difference between the two systems
                            and say something is wrong with one of
                            them). What you&#39;ve told me is not fine is
                            that if you drop i a third system that also
                            preserves T but reports aT where a _varies_
                            over some range.<br>
                            <br>
                            Have I heard you correctly?<span><br>
                              <blockquote type=3D"cite">
                                <div dir=3D"ltr">
                                  <div>
                                    <pre class=3D"m_-8072473529522433651m_2=
800513769154960288m_3072934530585377958gmail-newpage" style=3D"font-size:13=
.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Regards,</pre>
                                    <pre class=3D"m_-8072473529522433651m_2=
800513769154960288m_3072934530585377958gmail-newpage" style=3D"font-size:13=
.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0)">Greg</pre>
                                  </div>
                                </div>
                                <div class=3D"gmail_extra"><br>
                                  <div class=3D"gmail_quote">On Mon, Feb
                                    13, 2017 at 1:51 PM, Robert Sparks <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nostrum.com" target=3D"_blank"=
>rjsparks@nostrum.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">Reviewer=
:
                                      Robert Sparks<br>
                                      Review result: Ready<br>
                                      <br>
                                      I am the assigned Gen-ART reviewer
                                      for this draft. The General Area<br>
                                      Review Team (Gen-ART) reviews all
                                      IETF documents being processed<br>
                                      by the IESG for the IETF Chair.
                                      Please wait for direction from
                                      your<br>
                                      document shepherd or AD before
                                      posting a new version of the
                                      draft.<br>
                                      <br>
                                      For more information, please see
                                      the FAQ at<br>
                                      <br>
                                      &lt;<a href=3D"https://trac.ietf.org/=
trac/gen/wiki/GenArtfaq" rel=3D"noreferrer" target=3D"_blank">https://trac.=
ietf.org/trac/ge<wbr>n/wiki/GenArtfaq</a>&gt;.<br>
                                      <br>
                                      Document:
                                      draft-ietf-mpls-residence-time<wbr>-1=
3<br>
                                      Reviewer: Robert Sparks<br>
                                      Review Date: 2017-02-13<br>
                                      IETF LC End Date: 2017-01-17<br>
                                      IESG Telechat date: 2017-03-02<br>
                                      <br>
                                      Summary: Ready for publication as
                                      PS<br>
                                      <br>
                                      Thanks for addressing my comments.<br=
>
                                      (I still think some discussion
                                      about taking arrival and departure
                                      time<br>
                                      measurements would be helpful,
                                      even if it only said &quot;do it<br>
                                      consistently so you don&#39;t indicat=
e
                                      jitter that&#39;s not really there&qu=
ot;.)<br>
                                      <br>
                                    </blockquote>
                                  </div>
                                  <br>
                                </div>
                              </blockquote>
                              <br>
                            </span></div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </blockquote>
                  <br>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
  </div></div></div>

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

--94eb2c0931da251a7b05491f3b6d--


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Subject: [mpls] I-D Action: draft-ietf-mpls-residence-time-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 Multiprotocol Label Switching of the IETF.

        Title           : Residence Time Measurement in MPLS network
        Authors         : Greg Mirsky
                          Stefano Ruffini
                          Eric Gray
                          John Drake
                          Stewart Bryant
                          Alexander Vainshtein
	Filename        : draft-ietf-mpls-residence-time-14.txt
	Pages           : 28
	Date            : 2017-02-22

Abstract:
   This document specifies a new Generic Associated Channel for
   Residence Time Measurement and describes how it can be used by time
   synchronization protocols within a MPLS domain.

   Residence time is the variable part of propagation delay of timing
   and synchronization messages and knowing what this delay is for each
   message allows for a more accurate determination of the delay to be
   taken into account in applying the value included in a Precision Time
   Protocol event message.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-residence-time/

There's also a htmlized version available at:
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--_000_F82A4B6D50F9464B8EBA55651F541CF8AAB3C378SZXEMA504MBSchi_--


From nobody Wed Feb 22 20:29:14 2017
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To: "mpls@ietf.org" <mpls@ietf.org>
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] Implementation poll on draft-ietf-mpls-ldp-mrt
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Working Group,

We are preparing the publication request for draft-ietf-mpls-ldp-mrt,
part of the preparation is the Shepherd Write-Up. One question for the
Shepherd Write-Up is for existing and planned implementations.

This mail starts an Implementation Poll for draft-ietf-mpls-ldp-mrt.

If you are aware of existing implementations of draft-ietf-mpls-ldp-mrt,
please disclose this on the mpls wg mailing list or directly to the
wg chairs.

/Loa
mpls wg co-chair
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Thu Feb 23 02:40:02 2017
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Fatai Zhang'" <zhangfatai@huawei.com>, "'Naveen T'" <naveen.thanikachalam@yahoo.in>, <ccamp@ietf.org>, "'Mpls'" <mpls@ietf.org>
References: <1379399279.2996090.1487771407858.ref@mail.yahoo.com> <1379399279.2996090.1487771407858@mail.yahoo.com> <F82A4B6D50F9464B8EBA55651F541CF8AAB3C378@SZXEMA504-MBS.china.huawei.com>
In-Reply-To: <F82A4B6D50F9464B8EBA55651F541CF8AAB3C378@SZXEMA504-MBS.china.huawei.com>
Date: Thu, 23 Feb 2017 10:39:39 -0000
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Subject: Re: [mpls] =?utf-8?b?562U5aSNOiBbQ0NBTVBdIFF1ZXN0aW9uIHJlZ2FyZGluZyBS?= =?utf-8?q?FC_7260?=
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Fatai is right, I think.
=20
If you want to operate "static" MPLS LSPs without using a control plane, =
then it would (IMO) be peculiar to suddenly want to use a control plane =
to configure and manage OAM on that LSP.
=20
Why would you not use the same static provisioning tools?
=20
Of course, there is also RFC 7212 available to you.
=20
Adrian
=20
=20
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Fatai Zhang
Sent: 23 February 2017 03:30
To: Naveen T; ccamp@ietf.org; Mpls
Subject: [mpls] =E7=AD=94=E5=A4=8D: [CCAMP] Question regarding RFC 7260
=20
Hi Naveen,
=20
Per RFC 7487,  I think there should be GMPLS control plane for OAM =
configuration purpose.=20
=20
=20
=20
=20
=20
Thanks
=20
Fatai
=20
=E5=8F=91=E4=BB=B6=E4=BA=BA: CCAMP [mailto:ccamp-bounces@ietf.org] =
=E4=BB=A3=E8=A1=A8 Naveen T
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2017=E5=B9=B42=E6=9C=8822=E6=97=A5 =
21:50
=E6=94=B6=E4=BB=B6=E4=BA=BA: ccamp@ietf.org; Mpls
=E4=B8=BB=E9=A2=98: [CCAMP] Question regarding RFC 7260
=20
Dear Authors, et al.,
=20
RFC 7260 <https://tools.ietf.org/html/rfc7260>  describes the procedures =
for OAM configuration and control via RSVP-TE. RFC 7467 =
<https://tools.ietf.org/html/rfc7487>  further extends this to provide =
procedures to configure pro-active OAMs like BFD, FMS etc.=20
=20
I have a query regarding the usage of RSVP-TE to carry the OAM =
configurations from the MPLS-TP tunnel ingress to the tunnel egress.
Considering that the MPLS-TP bi-directional LSP has been established =
statically and the requirement is to only signal the OAM entities, I =
have the following assumptions:
1.  An IGP path must be established between the MPLS-TP tunnel's ingress =
and egress LERs.
2.  The MPLS-TP node_id of and LER/LSR, defined here =
<https://tools.ietf.org/html/rfc6370#section-4> , will also be =
configured as that LER's/LSR's loopback interface's address.
3.  The IGP will ensure that each LER/LSR learns about all the LSRs/LERs =
along the MPLS-TP transport path.
4.  RSVP-TE will use this IGP path to send/receive the PATH/RESV =
messages.
=20
Are these assumptions correct?
Or, should there be a GMPLS control-plane adjacency between LERs/LSRs =
along the MPLS-TP path with the TE links on these nodes acting as the =
MPLS-TP NNI interfaces?
=20
Thanks and Regards,
Naveen T
=20
=20
=20

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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue =
vlink=3Dpurple style=3D'tab-interval:36.0pt'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Fatai is right, I think.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>If you want to operate &quot;static&quot; MPLS =
LSPs without using a control plane, then it would (IMO) be peculiar to =
suddenly want to use a control plane to configure and manage OAM on that =
LSP.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Why would you not use the same static provisioning =
tools?<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:Calibri;mso-bidi-font-family:"Times New =
Roman";color:#1F497D'>Of course, there is also RFC 7212 available to =
you.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
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";mso-ansi-language:EN-US'>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";mso-ansi-language:EN-US'> mpls =
[mailto:mpls-bounces@ietf.org] <b>On Behalf Of </b>Fatai =
Zhang<br><b>Sent:</b> 23 February 2017 03:30<br><b>To:</b> Naveen T; =
ccamp@ietf.org; Mpls<br><b>Subject:</b> [mpls] </span><span =
style=3D'font-size:10.0pt;font-family:"MS UI =
Gothic","sans-serif";mso-bidi-font-family:"MS UI =
Gothic";mso-ansi-language:EN-US'>=E7=AD=94=E5=A4=8D</span><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman";mso-ansi-language:EN-US'>: [CCAMP] Question =
regarding RFC 7260<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Hi =
Naveen,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Per RFC 7487, =
&nbsp;I think there should be GMPLS control plane for OAM configuration =
purpose. <o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><div><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Thanks<o:p></o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><p class=3DMsoNormal style=3D'text-align:justify'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Fatai<o:p></o:p></s=
pan></p></div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497=
D;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></=
span></p><div><div style=3D'border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E5=8F=91=E4=BB=B6=E4=
=BA=BA</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'> CCAMP [mailto:ccamp-bounces@ietf.org] </span><b><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E4=BB=A3=E8=A1=A8 =
</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>Naveen T<br></span><b><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E5=8F=91=E9=80=81=E6=
=97=B6=E9=97=B4</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'> 2017</span><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E5=B9=B4</span><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>2</span><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E6=9C=88</span><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>22</span><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E6=97=A5</span><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'> 21:50<br></span><b><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E6=94=B6=E4=BB=B6=E4=
=BA=BA</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'> ccamp@ietf.org; Mpls<br></span><b><span lang=3DZH-CN =
style=3D'font-size:10.0pt;mso-fareast-language:ZH-CN'>=E4=B8=BB=E9=A2=98<=
/span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'>:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH=
-CN'> [CCAMP] Question regarding RFC =
7260<o:p></o:p></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;<=
/o:p></span></p><div><div id=3Dyiv3190523110><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_27819"><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_27818"><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23159"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Dear Authors, et =
al.,<o:p></o:p></span></p></div><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23159"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23159"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><a =
href=3D"https://tools.ietf.org/html/rfc7260">RFC 7260</a>&nbsp;describes =
the procedures for OAM configuration and control via RSVP-TE.&nbsp;<a =
href=3D"https://tools.ietf.org/html/rfc7487" =
id=3D"yui_3_16_0_ym19_1_1487767882136_28448">RFC 7467</a>&nbsp;further =
extends this to provide procedures to configure pro-active OAMs like =
BFD, FMS etc.&nbsp;<o:p></o:p></span></p></div><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_28460"><p class=3DMsoNormal =
style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div><div id=3D"yui_3_16_0_ym19_1_1487767882136_28460"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>I have a query =
regarding the usage of RSVP-TE to carry the OAM configurations from the =
MPLS-TP tunnel ingress to the tunnel =
egress.<o:p></o:p></span></p></div><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_28460"><p class=3DMsoNormal =
style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Considering that =
the MPLS-TP bi-directional LSP has been established statically and the =
requirement is to only signal the OAM entities, I have the following =
assumptions:<o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;tab-stops:list =
36.0pt;background:white'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";mso-fareast=
-font-family:Helvetica;color:black;mso-ansi-language:EN-US;mso-fareast-la=
nguage:ZH-CN'><span style=3D'mso-list:Ignore'>1.<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>An IGP path must be =
established between the MPLS-TP tunnel's ingress and egress =
LERs.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;tab-stops:list =
36.0pt;background:white'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";mso-fareast=
-font-family:Helvetica;color:black;mso-ansi-language:EN-US;mso-fareast-la=
nguage:ZH-CN'><span style=3D'mso-list:Ignore'>2.<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>The MPLS-TP node_id =
of and LER/LSR, defined&nbsp;<a =
href=3D"https://tools.ietf.org/html/rfc6370#section-4" =
id=3D"yui_3_16_0_ym19_1_1487767882136_29525">here</a>, will also be =
configured as that LER's/LSR's loopback interface's =
address.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;tab-stops:list =
36.0pt;background:white'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";mso-fareast=
-font-family:Helvetica;color:black;mso-ansi-language:EN-US;mso-fareast-la=
nguage:ZH-CN'><span style=3D'mso-list:Ignore'>3.<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>The IGP will ensure =
that each LER/LSR learns about all the LSRs/LERs along the MPLS-TP =
transport path.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2;tab-stops:list =
36.0pt;background:white'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";mso-fareast=
-font-family:Helvetica;color:black;mso-ansi-language:EN-US;mso-fareast-la=
nguage:ZH-CN'><span style=3D'mso-list:Ignore'>4.<span =
style=3D'font:7.0pt "Times New Roman"'>&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>RSVP-TE will use =
this IGP path to send/receive the PATH/RESV =
messages.<o:p></o:p></span></p><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_28491"><p class=3DMsoNormal =
style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div><div id=3D"yui_3_16_0_ym19_1_1487767882136_28491"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Are these =
assumptions correct?<o:p></o:p></span></p></div><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_28491"><p class=3DMsoNormal =
style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Or, should there be =
a GMPLS control-plane adjacency between LERs/LSRs along the MPLS-TP path =
with the TE links on these nodes acting as the MPLS-TP NNI =
interfaces?<o:p></o:p></span></p></div><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23159"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23162"><p =
class=3DMsoNormal style=3D'background:white'><b><i><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Thanks and =
Regards,</span></i></b><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p></o:p></span></=
p><div id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23165"><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt;background:white'><span =
lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'>Naveen =
T<o:p></o:p></span></p><div =
id=3D"yiv3190523110yui_3_16_0_ym19_1_1487767882136_23207"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div></div></div></div><div =
id=3D"yui_3_16_0_ym19_1_1487767882136_29211"><p class=3DMsoNormal =
style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div><div id=3D"yui_3_16_0_ym19_1_1487767882136_29065"><p =
class=3DMsoNormal style=3D'background:white'><span lang=3DEN-US =
style=3D'font-size:9.5pt;font-family:"Helvetica","sans-serif";color:black=
;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN'><o:p>&nbsp;</o:p></s=
pan></p></div></div></div></div></div></div></body></html>
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From: Alexander Vainshtein <vainshtein.alex@gmail.com>
Date: Wed, 22 Feb 2017 16:29:02 +0200
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To: Greg Mirsky <gregimirsky@gmail.com>
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Cc: mpls@ietf.org, gen-art@ietf.org, draft-ietf-mpls-residence-time.all@ietf.org, ietf@ietf.org, Robert Sparks <rjsparks@nostrum.com>
Subject: Re: [mpls] Review of draft-ietf-mpls-residence-time-13
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My thanks as well - to Robert for a most careful review and to Greg for
handling the draft for all these years.

Regards,
Sasha

On Feb 22, 2017 16:22, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

> Hi Robert,
> agreed. Thank you for your thorough review and the most helpful comments.
> I'll upload the update shortly.
>
> Regards,
> Greg
>
> On Wed, Feb 22, 2017 at 1:09 AM, Robert Sparks <rjsparks@nostrum.com>
> wrote:
>
>> I would simply delete "To ensure precise accuracy in time determination"
>> and start the sentence at "These actions"
>>
>> RjS
>>
>> On 2/15/17 9:40 PM, Greg Mirsky wrote:
>>
>> Hi Robert,
>> safe travel and here's another version for your consideration. The point
>> I'm trying to convey is that the jitter is real but must be accounted not
>> as part of propagation delay but as residence time. Hope I'm getting close.
>>
>>    Each RTM-capable
>>    node on the explicit path receives an RTM packet and records the time
>>    at which it receives that packet at its ingress interface as well as
>>    the time at which it transmits that packet from its egress interface.
>>    To ensure precise accuracy in time determination these actions should
>>    be done as close to the physical layer as possible at the same point
>>    of packet processing striving to avoid introducing the appearance of
>>    jitter in propogation delay whereas it should be accounted as
>>    residence time.
>>
>> Regards,
>>
>> Greg
>>
>>
>> On Wed, Feb 15, 2017 at 11:15 AM, Robert Sparks <rjsparks@nostrum.com>
>> wrote:
>>
>>>
>>>
>>> On 2/15/17 11:20 AM, Greg Mirsky wrote:
>>>
>>> Hi Robert,
>>> yes, you've absolutely correct in your example
>>>
>>>

--001a11444e527d8c2505491f5107
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<div dir=3D"auto">My thanks as well - to Robert for a most careful review a=
nd to Greg for handling the draft for all these years.<div dir=3D"auto"><br=
></div><div dir=3D"auto">Regards,</div><div dir=3D"auto">Sasha</div></div><=
div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Feb 22, 2017 16=
:22, &quot;Greg Mirsky&quot; &lt;<a href=3D"mailto:gregimirsky@gmail.com">g=
regimirsky@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex"><div dir=3D"ltr">Hi Robert,<div>agreed. Thank you for your =
thorough review and the most helpful comments. I&#39;ll upload the update s=
hortly.</div><div><br></div><div>Regards,</div><div>Greg</div></div><div cl=
ass=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Feb 22, 2017 at =
1:09 AM, Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@nos=
trum.com" target=3D"_blank">rjsparks@nostrum.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">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" text=3D"#000000">
    <p>I would simply delete &quot;To ensure precise accuracy in time
      determination&quot; and start the sentence at &quot;These actions&quo=
t;</p>
    <p>RjS<br>
    </p><div><div class=3D"m_557604467699402152h5">
    <br>
    <div class=3D"m_557604467699402152m_-8072473529522433651moz-cite-prefix=
">On 2/15/17 9:40 PM, Greg Mirsky wrote:<br>
    </div>
    <blockquote type=3D"cite">
      <div dir=3D"ltr">Hi Robert,
        <div>safe travel and here&#39;s another version for your
          consideration. The point I&#39;m trying to convey is that the
          jitter is real but must be accounted not as part of
          propagation delay but as residence time. Hope I&#39;m getting
          close.</div>
        <div>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">   Each RTM-capable
   node on the explicit path receives an RTM packet and records the time
   at which it receives that packet at its ingress interface as well as
   the time at which it transmits that packet from its egress interface.
   To ensure precise accuracy in time determination these actions should
   be done as close to the physical layer as possible at the same point
   of packet processing striving to avoid introducing the appearance of
   jitter in propogation delay whereas it should be accounted as
   residence time. </pre>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Regards,</pre>
          <pre style=3D"color:rgb(0,0,0);word-wrap:break-word;white-space:p=
re-wrap">Greg</pre>
        </div>
      </div>
      <div class=3D"gmail_extra"><br>
        <div class=3D"gmail_quote">On Wed, Feb 15, 2017 at 11:15 AM,
          Robert Sparks <span dir=3D"ltr">&lt;<a href=3D"mailto:rjsparks@no=
strum.com" target=3D"_blank">rjsparks@nostrum.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">
            <div bgcolor=3D"#FFFFFF" text=3D"#000000"><span>
                <p><br>
                </p>
                <br>
                <div class=3D"m_557604467699402152m_-8072473529522433651m_2=
800513769154960288moz-cite-prefix">On
                  2/15/17 11:20 AM, Greg Mirsky wrote:<br>
                </div>
              </span>
              <blockquote type=3D"cite">
                <div dir=3D"ltr">Hi Robert, <span>
                    <div>yes, you&#39;ve absolutely correct in your example=
</div></span></div></blockquote></div></blockquote></div></div></blockquote=
></div></div></div></blockquote></div></div></blockquote></div></div>

--001a11444e527d8c2505491f5107--


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From nobody Fri Feb 24 12:11:47 2017
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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 Multiprotocol Label Switching of the IETF.

        Title           : MPLS Flow Identification Considerations
        Authors         : Stewart Bryant
                          Carlos Pignataro
                          Mach Chen
                          Zhenbin Li
                          Gregory Mirsky
	Filename        : draft-ietf-mpls-flow-ident-04.txt
	Pages           : 11
	Date            : 2017-02-24

Abstract:
   This memo discusses the aspects that must be considered when
   developing a solution for MPLS flow identification.  The key
   application that needs this is in-band performance monitoring of user
   data packets.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-flow-ident/

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From nobody Sun Feb 26 13:54:24 2017
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Subject: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm a bit confused on one point. There's one reference to NTP in the
Introduction, everything else is about PTP, but the specification never
actually says if this mechanism is intended to be usable for NTP as well.
Could that be clearer?



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From: Mach Chen <mach.chen@huawei.com>
To: "'rtg-ads@ietf.org'" <rtg-ads@ietf.org>
Thread-Topic: RtgDir review: draft-ietf-mpls-tp-shared-ring-protection-04.txt
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Date: Mon, 27 Feb 2017 10:05:16 +0000
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Subject: [mpls] RtgDir review: draft-ietf-mpls-tp-shared-ring-protection-04.txt
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 27 Feb 2017 07:55:47 -0800
Message-ID: <CA+RyBmXFjsYEmhEPbcWr143GtM0DDDaAoaGrfCL8BNE+F7qTwg@mail.gmail.com>
To: Spencer Dawkins <spencerdawkins.ietf@gmail.com>
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Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--94eb2c03c39ae902cf0549851c15
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Hi Spencer,
thank you for your thorough review and the question.
NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
Residence Time Measurement we've noted that NTP may be one type of TLV and
have requested appropriate allocation by IANA in the new sub-registry MPLS
RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
transparent clock, the RTM over MPLS will be capable to support it.
We're open to your suggestions to make it clearer.

Kind regards,
Greg

On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
spencerdawkins.ietf@gmail.com> wrote:

> Spencer Dawkins has entered the following ballot position for
> draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> I'm a bit confused on one point. There's one reference to NTP in the
> Introduction, everything else is about PTP, but the specification never
> actually says if this mechanism is intended to be usable for NTP as well.
> Could that be clearer?
>
>
>

--94eb2c03c39ae902cf0549851c15
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Spencer,<div>thank you for your thorough review and the=
 question.</div><div>NTP yet doesn&#39;t use transparent clock paradigm but=
 in section 3=C2=A0<span style=3D"background-color:rgb(255,253,245);color:r=
gb(0,0,0)"><font face=3D"arial, helvetica, sans-serif">G-ACh for Residence =
Time Measurement we&#39;ve noted that NTP may be one type of TLV and have r=
equested appropriate allocation by IANA in the new sub-registry=C2=A0</font=
></span><span style=3D"background-color:rgb(255,253,245);color:rgb(0,0,0)">=
<font face=3D"arial, helvetica, sans-serif">MPLS RTM TLV Registry (section =
7.2). Thus, if NTP will be enhanced to use transparent clock, the RTM over =
MPLS will be capable to support it.</font></span></div><div><font color=3D"=
#000000" face=3D"arial, helvetica, sans-serif"><span style=3D"background-co=
lor:rgb(255,253,245)">We&#39;re open to your suggestions to make it clearer=
.</span></font></div><div><font color=3D"#000000" face=3D"arial, helvetica,=
 sans-serif"><span style=3D"background-color:rgb(255,253,245)"><br></span><=
/font></div><div><font color=3D"#000000" face=3D"arial, helvetica, sans-ser=
if"><span style=3D"background-color:rgb(255,253,245)">Kind regards,</span><=
/font></div><div><font color=3D"#000000" face=3D"arial, helvetica, sans-ser=
if"><span style=3D"background-color:rgb(255,253,245)">Greg</span></font></d=
iv></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, =
Feb 26, 2017 at 1:54 PM, Spencer Dawkins <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencerdawkins.ietf@=
gmail.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">Spencer =
Dawkins has entered the following ballot position for<br>
draft-ietf-mpls-residence-<wbr>time-14: 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/<=
wbr>statement/discuss-criteria.<wbr>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-mpls-residence-time/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/<wbr>do=
c/draft-ietf-mpls-residence-<wbr>time/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<br>
</blockquote></div><br></div>

--94eb2c03c39ae902cf0549851c15--


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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
Date: Mon, 27 Feb 2017 11:06:18 -0600
Message-ID: <CAKKJt-c4c8CM77AF1Z61pH6-c4RpsW=YjoiauWNSsCG7o592uA@mail.gmail.com>
To: Greg Mirsky <gregimirsky@gmail.com>
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Cc: mpls-chairs@ietf.org, draft-ietf-mpls-residence-time@ietf.org, iesg@ietf.org, "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--001a11482484146ae9054986193b
Content-Type: text/plain; charset=UTF-8

Hi, Greg,

On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,
thank you for your thorough review and the question.
NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
Residence Time Measurement we've noted that NTP may be one type of TLV and
have requested appropriate allocation by IANA in the new sub-registry MPLS
RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
transparent clock, the RTM over MPLS will be capable to support it.
We're open to your suggestions to make it clearer.


So, is it correct to say that PTP is the only time protocol that uses the
transparent clock paradigm today?

Spencer

Kind regards,
Greg

On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
spencerdawkins.ietf@gmail.com> wrote:

> Spencer Dawkins has entered the following ballot position for
> draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> I'm a bit confused on one point. There's one reference to NTP in the
> Introduction, everything else is about PTP, but the specification never
> actually says if this mechanism is intended to be usable for NTP as well.
> Could that be clearer?
>
>
>

--001a11482484146ae9054986193b
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Hi, Greg,<br><div class=3D"gmail_extra" dir=3D"auto"><br>=
<div class=3D"gmail_quote">On Feb 27, 2017 09:55, &quot;Greg Mirsky&quot; &=
lt;<a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmail.com</a>&gt; w=
rote:<br type=3D"attribution"><blockquote class=3D"quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi =
Spencer,<div>thank you for your thorough review and the question.</div><div=
>NTP yet doesn&#39;t use transparent clock paradigm but in section 3=C2=A0<=
span style=3D"background-color:rgb(255,253,245);color:rgb(0,0,0)"><font fac=
e=3D"arial, helvetica, sans-serif">G-ACh for Residence Time Measurement we&=
#39;ve noted that NTP may be one type of TLV and have requested appropriate=
 allocation by IANA in the new sub-registry=C2=A0</font></span><span style=
=3D"background-color:rgb(255,253,245);color:rgb(0,0,0)"><font face=3D"arial=
, helvetica, sans-serif">MPLS RTM TLV Registry (section 7.2). Thus, if NTP =
will be enhanced to use transparent clock, the RTM over MPLS will be capabl=
e to support it.</font></span></div><div><font color=3D"#000000" face=3D"ar=
ial, helvetica, sans-serif"><span style=3D"background-color:rgb(255,253,245=
)">We&#39;re open to your suggestions to make it clearer.</span></font></di=
v></div></blockquote></div></div><div dir=3D"auto"><br></div><div dir=3D"au=
to">So, is it correct to say that PTP is the only time protocol that uses t=
he transparent clock paradigm today?</div><div dir=3D"auto"><br></div><div =
dir=3D"auto">Spencer</div><div dir=3D"auto"><br></div><div class=3D"gmail_e=
xtra" dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 dir=3D"ltr"><div><span style=3D"background-color:rgb(255,253,245);font-fam=
ily:arial,helvetica,sans-serif">Kind regards,</span></div><div><font color=
=3D"#000000" face=3D"arial, helvetica, sans-serif"><span style=3D"backgroun=
d-color:rgb(255,253,245)">Greg</span></font></div></div><div class=3D"elide=
d-text"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, F=
eb 26, 2017 at 1:54 PM, Spencer Dawkins <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencerdawkins.ietf@g=
mail.com</a><wbr>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Spenc=
er Dawkins has entered the following ballot position for<br>
draft-ietf-mpls-residence-time<wbr>-14: 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=
tat<wbr>ement/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-mpls-residence-time/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d<wbr>o=
c/draft-ietf-mpls-residence-t<wbr>ime/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<br>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></div>

--001a11482484146ae9054986193b--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 27 Feb 2017 09:13:23 -0800
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To: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
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Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--f4030435a8046c01e40549863218
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Hi Spencer,
yes, only PTP has defined operation of the transparent clock and how to use
the residence time to improve accuracy of distributed time.

Regards,
Greg

On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <
spencerdawkins.ietf@gmail.com> wrote:

> Hi, Greg,
>
> On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:
>
> Hi Spencer,
> thank you for your thorough review and the question.
> NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
> Residence Time Measurement we've noted that NTP may be one type of TLV and
> have requested appropriate allocation by IANA in the new sub-registry MPLS
> RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
> transparent clock, the RTM over MPLS will be capable to support it.
> We're open to your suggestions to make it clearer.
>
>
> So, is it correct to say that PTP is the only time protocol that uses the
> transparent clock paradigm today?
>
> Spencer
>
> Kind regards,
> Greg
>
> On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
> spencerdawkins.ietf@gmail.com> wrote:
>
>> Spencer Dawkins has entered the following ballot position for
>> draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/
>>
>>
>>
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>
>> I'm a bit confused on one point. There's one reference to NTP in the
>> Introduction, everything else is about PTP, but the specification never
>> actually says if this mechanism is intended to be usable for NTP as well.
>> Could that be clearer?
>>
>>
>>
>
>
>

--f4030435a8046c01e40549863218
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Hi Spencer,<div>yes, only PTP has defined operation of the=
 transparent clock and how to use the residence time to improve accuracy of=
 distributed time.</div><div><br></div><div>Regards,</div><div>Greg</div></=
div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Feb 2=
7, 2017 at 9:06 AM, Spencer Dawkins at IETF <span dir=3D"ltr">&lt;<a href=
=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencerdawkins.=
ietf@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 dir=3D"auto">Hi, Greg,<span class=3D""><br><div class=3D"gmail_extra" dir=
=3D"auto"><br><div class=3D"gmail_quote">On Feb 27, 2017 09:55, &quot;Greg =
Mirsky&quot; &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank"=
>gregimirsky@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote c=
lass=3D"m_-5708317968737614450quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi Spencer,<div>thank yo=
u for your thorough review and the question.</div><div>NTP yet doesn&#39;t =
use transparent clock paradigm but in section 3=C2=A0<span style=3D"backgro=
und-color:rgb(255,253,245);color:rgb(0,0,0)"><font face=3D"arial, helvetica=
, sans-serif">G-ACh for Residence Time Measurement we&#39;ve noted that NTP=
 may be one type of TLV and have requested appropriate allocation by IANA i=
n the new sub-registry=C2=A0</font></span><span style=3D"background-color:r=
gb(255,253,245);color:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-seri=
f">MPLS RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to us=
e transparent clock, the RTM over MPLS will be capable to support it.</font=
></span></div><div><font color=3D"#000000" face=3D"arial, helvetica, sans-s=
erif"><span style=3D"background-color:rgb(255,253,245)">We&#39;re open to y=
our suggestions to make it clearer.</span></font></div></div></blockquote><=
/div></div><div dir=3D"auto"><br></div></span><div dir=3D"auto">So, is it c=
orrect to say that PTP is the only time protocol that uses the transparent =
clock paradigm today?</div><span class=3D"HOEnZb"><font color=3D"#888888"><=
div dir=3D"auto"><br></div><div dir=3D"auto">Spencer</div></font></span><sp=
an class=3D""><div dir=3D"auto"><br></div><div class=3D"gmail_extra" dir=3D=
"auto"><div class=3D"gmail_quote"><blockquote class=3D"m_-57083179687376144=
50quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><div dir=3D"ltr"><div><span style=3D"background-color:rgb(255,253,245=
);font-family:arial,helvetica,sans-serif">Kind regards,</span></div><div><f=
ont color=3D"#000000" face=3D"arial, helvetica, sans-serif"><span style=3D"=
background-color:rgb(255,253,245)">Greg</span></font></div></div><div class=
=3D"m_-5708317968737614450elided-text"><div class=3D"gmail_extra"><br><div =
class=3D"gmail_quote">On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=
=3D"_blank">spencerdawkins.ietf@gmail.com</a><wbr>&gt;</span> wrote:<br><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #=
ccc solid;padding-left:1ex">Spencer Dawkins has entered the following ballo=
t position for<br>
draft-ietf-mpls-residence-time<wbr>-14: 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=
tat<wbr>ement/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-mpls-residence-time/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d<wbr>o=
c/draft-ietf-mpls-residence-t<wbr>ime/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<br>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></span></div>
</blockquote></div><br></div>

--f4030435a8046c01e40549863218--


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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
Date: Mon, 27 Feb 2017 11:46:32 -0600
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To: Greg Mirsky <gregimirsky@gmail.com>
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Cc: mpls-chairs@ietf.org, draft-ietf-mpls-residence-time@ietf.org, "mpls@ietf.org" <mpls@ietf.org>, iesg@ietf.org
Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--001a114dbe76f528b7054986a835
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Hi, Greg,

On Feb 27, 2017 11:13, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,
yes, only PTP has defined operation of the transparent clock and how to use
the residence time to improve accuracy of distributed time.


(Remembering that this is a no-blocking comment)

I'd suggest removing the text reference to NTP in the Introduction, and
mentioning that you're allocating the value for NTP in Section 7.2, but
that NTP can't make use of this mechanism unless it adds support for
transparent clock.

Does that make sense?

Spencer

Regards,
Greg

On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <
spencerdawkins.ietf@gmail.com> wrote:

> Hi, Greg,
>
> On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:
>
> Hi Spencer,
> thank you for your thorough review and the question.
> NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
> Residence Time Measurement we've noted that NTP may be one type of TLV and
> have requested appropriate allocation by IANA in the new sub-registry MPLS
> RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
> transparent clock, the RTM over MPLS will be capable to support it.
> We're open to your suggestions to make it clearer.
>
>
> So, is it correct to say that PTP is the only time protocol that uses the
> transparent clock paradigm today?
>
> Spencer
>
> Kind regards,
> Greg
>
> On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
> spencerdawkins.ietf@gmail.com> wrote:
>
>> Spencer Dawkins has entered the following ballot position for
>> draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/
>>
>>
>>
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>
>> I'm a bit confused on one point. There's one reference to NTP in the
>> Introduction, everything else is about PTP, but the specification never
>> actually says if this mechanism is intended to be usable for NTP as well.
>> Could that be clearer?
>>
>>
>>
>
>
>

--001a114dbe76f528b7054986a835
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<div dir=3D"auto">Hi, Greg,<br><div class=3D"gmail_extra" dir=3D"auto"><br>=
<div class=3D"gmail_quote">On Feb 27, 2017 11:13, &quot;Greg Mirsky&quot; &=
lt;<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@g=
mail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"m_-392=
5222169232903857quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex"><div dir=3D"ltr">Hi Spencer,<div>yes, only PTP has defi=
ned operation of the transparent clock and how to use the residence time to=
 improve accuracy of distributed time.</div></div></blockquote></div></div>=
<div dir=3D"auto"><br></div><div dir=3D"auto">(Remembering that this is a n=
o-blocking comment)</div><div dir=3D"auto"><br></div><div dir=3D"auto">I&#3=
9;d suggest removing the text reference to NTP in the Introduction, and men=
tioning that you&#39;re allocating the value for NTP in Section 7.2, but th=
at NTP can&#39;t make use of this mechanism unless it adds support for tran=
sparent clock.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Does that=
 make sense?</div><div dir=3D"auto"><br></div><div dir=3D"auto">Spencer</di=
v><div dir=3D"auto"><br></div><div class=3D"gmail_extra" dir=3D"auto"><div =
class=3D"gmail_quote"><blockquote class=3D"m_-3925222169232903857quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div d=
ir=3D"ltr"><div>Regards,</div><div>Greg</div></div><div class=3D"m_-3925222=
169232903857elided-text"><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <span dir=
=3D"ltr">&lt;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_bl=
ank">spencerdawkins.ietf@gmail.com</a><wbr>&gt;</span> wrote:<br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><div dir=3D"auto">Hi, Greg,<span><br><div class=3D"gma=
il_extra" dir=3D"auto"><br><div class=3D"gmail_quote">On Feb 27, 2017 09:55=
, &quot;Greg Mirsky&quot; &lt;<a href=3D"mailto:gregimirsky@gmail.com" targ=
et=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:<br type=3D"attribution">=
<blockquote class=3D"m_-3925222169232903857m_-1519418986500970406m_-5708317=
968737614450quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex"><div dir=3D"ltr">Hi Spencer,<div>thank you for your thoroug=
h review and the question.</div><div>NTP yet doesn&#39;t use transparent cl=
ock paradigm but in section 3=C2=A0<span style=3D"background-color:rgb(255,=
253,245);color:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-serif">G-AC=
h for Residence Time Measurement we&#39;ve noted that NTP may be one type o=
f TLV and have requested appropriate allocation by IANA in the new sub-regi=
stry=C2=A0</font></span><span style=3D"background-color:rgb(255,253,245);co=
lor:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-serif">MPLS RTM TLV Re=
gistry (section 7.2). Thus, if NTP will be enhanced to use transparent cloc=
k, the RTM over MPLS will be capable to support it.</font></span></div><div=
><font color=3D"#000000" face=3D"arial, helvetica, sans-serif"><span style=
=3D"background-color:rgb(255,253,245)">We&#39;re open to your suggestions t=
o make it clearer.</span></font></div></div></blockquote></div></div><div d=
ir=3D"auto"><br></div></span><div dir=3D"auto">So, is it correct to say tha=
t PTP is the only time protocol that uses the transparent clock paradigm to=
day?</div><span class=3D"m_-3925222169232903857m_-1519418986500970406HOEnZb=
"><font color=3D"#888888"><div dir=3D"auto"><br></div><div dir=3D"auto">Spe=
ncer</div></font></span><span><div dir=3D"auto"><br></div><div class=3D"gma=
il_extra" dir=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"m_-3=
925222169232903857m_-1519418986500970406m_-5708317968737614450quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr"><div><span style=3D"background-color:rgb(255,253,245);font-family:=
arial,helvetica,sans-serif">Kind regards,</span></div><div><font color=3D"#=
000000" face=3D"arial, helvetica, sans-serif"><span style=3D"background-col=
or:rgb(255,253,245)">Greg</span></font></div></div><div class=3D"m_-3925222=
169232903857m_-1519418986500970406m_-5708317968737614450elided-text"><div c=
lass=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Feb 26, 2017 at=
 1:54 PM, Spencer Dawkins <span dir=3D"ltr">&lt;<a href=3D"mailto:spencerda=
wkins.ietf@gmail.com" target=3D"_blank">spencerdawkins.ietf@gmail.com</a><w=
br>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Spencer Dawkins has=
 entered the following ballot position for<br>
draft-ietf-mpls-residence-time<wbr>-14: 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=
tat<wbr>ement/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-mpls-residence-time/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d<wbr>o=
c/draft-ietf-mpls-residence-t<wbr>ime/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<br>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></span></div>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></div>

--001a114dbe76f528b7054986a835--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 27 Feb 2017 09:58:27 -0800
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Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--94eb2c114f2699a9a8054986d3ba
Content-Type: text/plain; charset=UTF-8

Hi Spencer,
thank you for your consideration.
I think that reference to NTP as one of protocols, and it is broadly used
protocol, to synchronize clocks in the Introduction may be justified. I
propose to add a note, as you've suggested, in section 3 that allocation of
the value for NTP payload is forward looking as use of the transparent
clock not yet been defined for NTP.

Regards,
Greg

On Mon, Feb 27, 2017 at 9:46 AM, Spencer Dawkins at IETF <
spencerdawkins.ietf@gmail.com> wrote:

> Hi, Greg,
>
> On Feb 27, 2017 11:13, "Greg Mirsky" <gregimirsky@gmail.com> wrote:
>
> Hi Spencer,
> yes, only PTP has defined operation of the transparent clock and how to
> use the residence time to improve accuracy of distributed time.
>
>
> (Remembering that this is a no-blocking comment)
>
> I'd suggest removing the text reference to NTP in the Introduction, and
> mentioning that you're allocating the value for NTP in Section 7.2, but
> that NTP can't make use of this mechanism unless it adds support for
> transparent clock.
>
> Does that make sense?
>
> Spencer
>
> Regards,
> Greg
>
> On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <
> spencerdawkins.ietf@gmail.com> wrote:
>
>> Hi, Greg,
>>
>> On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:
>>
>> Hi Spencer,
>> thank you for your thorough review and the question.
>> NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh
>> for Residence Time Measurement we've noted that NTP may be one type of TLV
>> and have requested appropriate allocation by IANA in the new sub-registry MPLS
>> RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
>> transparent clock, the RTM over MPLS will be capable to support it.
>> We're open to your suggestions to make it clearer.
>>
>>
>> So, is it correct to say that PTP is the only time protocol that uses the
>> transparent clock paradigm today?
>>
>> Spencer
>>
>> Kind regards,
>> Greg
>>
>> On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
>> spencerdawkins.ietf@gmail.com> wrote:
>>
>>> Spencer Dawkins has entered the following ballot position for
>>> draft-ietf-mpls-residence-time-14: 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/stat
>>> ement/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-mpls-residence-time/
>>>
>>>
>>>
>>> ----------------------------------------------------------------------
>>> COMMENT:
>>> ----------------------------------------------------------------------
>>>
>>> I'm a bit confused on one point. There's one reference to NTP in the
>>> Introduction, everything else is about PTP, but the specification never
>>> actually says if this mechanism is intended to be usable for NTP as well.
>>> Could that be clearer?
>>>
>>>
>>>
>>
>>
>>
>
>
>

--94eb2c114f2699a9a8054986d3ba
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Spencer,<div>thank you for your consideration.</div><di=
v>I think that reference to NTP as one of protocols, and it is broadly used=
 protocol, to synchronize clocks in the Introduction may be justified. I pr=
opose to add a note, as you&#39;ve suggested, in section 3 that allocation =
of the value for NTP payload is forward looking as use of the transparent c=
lock not yet been defined for NTP.</div><div><br></div><div>Regards,</div><=
div>Greg</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quot=
e">On Mon, Feb 27, 2017 at 9:46 AM, Spencer Dawkins at IETF <span dir=3D"lt=
r">&lt;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">s=
pencerdawkins.ietf@gmail.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 dir=3D"auto">Hi, Greg,<br><div class=3D"gmail_extra" dir=3D"=
auto"><br><div class=3D"gmail_quote"><span class=3D"">On Feb 27, 2017 11:13=
, &quot;Greg Mirsky&quot; &lt;<a href=3D"mailto:gregimirsky@gmail.com" targ=
et=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:<br type=3D"attribution">=
</span><blockquote class=3D"m_-6442723684353744890m_-3925222169232903857quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><div dir=3D"ltr">Hi Spencer,<span class=3D""><div>yes, only PTP has define=
d operation of the transparent clock and how to use the residence time to i=
mprove accuracy of distributed time.</div></span></div></blockquote></div><=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">(Remembering that this i=
s a no-blocking comment)</div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>I&#39;d suggest removing the text reference to NTP in the Introduction, an=
d mentioning that you&#39;re allocating the value for NTP in Section 7.2, b=
ut that NTP can&#39;t make use of this mechanism unless it adds support for=
 transparent clock.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Does=
 that make sense?</div><span class=3D"HOEnZb"><font color=3D"#888888"><div =
dir=3D"auto"><br></div><div dir=3D"auto">Spencer</div></font></span><div><d=
iv class=3D"h5"><div dir=3D"auto"><br></div><div class=3D"gmail_extra" dir=
=3D"auto"><div class=3D"gmail_quote"><blockquote class=3D"m_-64427236843537=
44890m_-3925222169232903857quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div>Regards,</div><div>Gre=
g</div></div><div class=3D"m_-6442723684353744890m_-3925222169232903857elid=
ed-text"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, =
Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencerdawki=
ns.ietf@gmail.com</a><wbr>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div dir=3D"auto">Hi, Greg,<span><br><div class=3D"gmail_extra" dir=3D"=
auto"><br><div class=3D"gmail_quote">On Feb 27, 2017 09:55, &quot;Greg Mirs=
ky&quot; &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gre=
gimirsky@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=
=3D"m_-6442723684353744890m_-3925222169232903857m_-1519418986500970406m_-57=
08317968737614450quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex"><div dir=3D"ltr">Hi Spencer,<div>thank you for your th=
orough review and the question.</div><div>NTP yet doesn&#39;t use transpare=
nt clock paradigm but in section 3=C2=A0<span style=3D"background-color:rgb=
(255,253,245);color:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-serif"=
>G-ACh for Residence Time Measurement we&#39;ve noted that NTP may be one t=
ype of TLV and have requested appropriate allocation by IANA in the new sub=
-registry=C2=A0</font></span><span style=3D"background-color:rgb(255,253,24=
5);color:rgb(0,0,0)"><font face=3D"arial, helvetica, sans-serif">MPLS RTM T=
LV Registry (section 7.2). Thus, if NTP will be enhanced to use transparent=
 clock, the RTM over MPLS will be capable to support it.</font></span></div=
><div><font color=3D"#000000" face=3D"arial, helvetica, sans-serif"><span s=
tyle=3D"background-color:rgb(255,253,245)">We&#39;re open to your suggestio=
ns to make it clearer.</span></font></div></div></blockquote></div></div><d=
iv dir=3D"auto"><br></div></span><div dir=3D"auto">So, is it correct to say=
 that PTP is the only time protocol that uses the transparent clock paradig=
m today?</div><span class=3D"m_-6442723684353744890m_-3925222169232903857m_=
-1519418986500970406HOEnZb"><font color=3D"#888888"><div dir=3D"auto"><br><=
/div><div dir=3D"auto">Spencer</div></font></span><span><div dir=3D"auto"><=
br></div><div class=3D"gmail_extra" dir=3D"auto"><div class=3D"gmail_quote"=
><blockquote class=3D"m_-6442723684353744890m_-3925222169232903857m_-151941=
8986500970406m_-5708317968737614450quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><span style=3D=
"background-color:rgb(255,253,245);font-family:arial,helvetica,sans-serif">=
Kind regards,</span></div><div><font color=3D"#000000" face=3D"arial, helve=
tica, sans-serif"><span style=3D"background-color:rgb(255,253,245)">Greg</s=
pan></font></div></div><div class=3D"m_-6442723684353744890m_-3925222169232=
903857m_-1519418986500970406m_-5708317968737614450elided-text"><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Feb 26, 2017 at 1:5=
4 PM, Spencer Dawkins <span dir=3D"ltr">&lt;<a href=3D"mailto:spencerdawkin=
s.ietf@gmail.com" target=3D"_blank">spencerdawkins.ietf@gmail.com</a><wbr>&=
gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Spencer Dawkins has ent=
ered the following ballot position for<br>
draft-ietf-mpls-residence-time<wbr>-14: 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=
tat<wbr>ement/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-mpls-residence-time/=
" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d<wbr>o=
c/draft-ietf-mpls-residence-t<wbr>ime/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<br>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></span></div>
</blockquote></div><br></div>
</div></blockquote></div><br><br></div></div></div></div>
</blockquote></div><br></div>

--94eb2c114f2699a9a8054986d3ba--


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From: Eric Gray <eric.gray@ericsson.com>
To: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, Greg Mirsky <gregimirsky@gmail.com>
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From nobody Mon Feb 27 12:21:36 2017
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Subject: [mpls] Review of draft-ietf-mpls-residence-time-14
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Reviewer: Robert Sparks
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-mpls-residence-time-14
Reviewer: Robert Sparks
Review Date: 2017-02-27
IETF LC End Date: 2017-01-17
IESG Telechat date: 2017-03-02

Summary: (Still) Ready.

My comments have been addressed.

There were some fairly big changes for a document in IETF LC that came
in with this version
based on feedback from the call for review from several other working
groups.  The new text
looks ok to me.



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Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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Spencer and all,
I concur with Eric.

The RTM mechanism defined in this spec does not depend on the protocol -
NPT, PTP or something else - that is carried over an LSP.

However, PTP by design can use the information about accummulated on-path
delay (the Correction field in its PDUs has been defined for just this
purpose), while NTP, in its present form, cannot do that.

If/when the NTP spec is updated so that it can use measured on-path delay,
it would be able to benefit from RTM as well - as I see it, without any
substantial changes to this spec.

Hopefully this helps.

My 2c,
Sasha

On Feb 27, 2017 21:41, "Eric Gray" <eric.gray@ericsson.com> wrote:

Spencer,



                While the reference to NTP is forward looking (as Greg
suggested) =E2=80=93 there is no strong reason to suspect that additional w=
ork
relative to this specification will _*necessarily*_ be required.



Transparent Clock (again as Greg mentioned) has not yet been defined for
NTP.



                The essential element of transparent clock is that there
needs to be a way to determine the amount of time a message spends at each
hop (this is the variable component of delay for any given path) so that
this delay can be corrected for.  The more hops for which you have this
information, the more accurate the corrected time values will be.



                If you can determine the variable delay experienced by a
time message, you can combine this information with the measurable fixed
delay (associated mostly with light-speed delays) to provide a very precise
corrected time value.



                Transparent Clock is quite elegant in that sense, as long
as it can be done without layer-violations.  J



--

Eric



*From:* Spencer Dawkins at IETF [mailto:spencerdawkins.ietf@gmail.com]
*Sent:* Monday, February 27, 2017 12:47 PM
*To:* Greg Mirsky <gregimirsky@gmail.com>
*Cc:* iesg@ietf.org; draft-ietf-mpls-residence-time@ietf.org; Loa Andersson
<loa@pi.nu>; mpls-chairs@ietf.org; mpls@ietf.org
*Subject:* Re: Spencer Dawkins' No Objection on
draft-ietf-mpls-residence-time-14:
(with COMMENT)



Hi, Greg,



On Feb 27, 2017 11:13, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,

yes, only PTP has defined operation of the transparent clock and how to use
the residence time to improve accuracy of distributed time.



(Remembering that this is a no-blocking comment)



I'd suggest removing the text reference to NTP in the Introduction, and
mentioning that you're allocating the value for NTP in Section 7.2, but
that NTP can't make use of this mechanism unless it adds support for
transparent clock.



Does that make sense?



Spencer



Regards,

Greg



On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <
spencerdawkins.ietf@gmail.com> wrote:

Hi, Greg,



On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,

thank you for your thorough review and the question.

NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
Residence Time Measurement we've noted that NTP may be one type of TLV and
have requested appropriate allocation by IANA in the new sub-registry MPLS
RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
transparent clock, the RTM over MPLS will be capable to support it.

We're open to your suggestions to make it clearer.



So, is it correct to say that PTP is the only time protocol that uses the
transparent clock paradigm today?



Spencer



Kind regards,

Greg



On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
spencerdawkins.ietf@gmail.com> wrote:

Spencer Dawkins has entered the following ballot position for
draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm a bit confused on one point. There's one reference to NTP in the
Introduction, everything else is about PTP, but the specification never
actually says if this mechanism is intended to be usable for NTP as well.
Could that be clearer?

--94eb2c055d18208d0505498945f2
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Spencer and all,<div dir=3D"auto">I concur with Eric.</di=
v><div dir=3D"auto"><br></div><div dir=3D"auto">The RTM mechanism defined i=
n this spec does not depend on the protocol - NPT, PTP or something else - =
that is carried over an LSP.=C2=A0</div><div dir=3D"auto"><br></div><div di=
r=3D"auto">However, PTP by design can use the information about accummulate=
d on-path delay (the Correction field in its PDUs has been defined for just=
 this purpose), while NTP, in its present form, cannot do that.</div><div d=
ir=3D"auto"><br></div><div dir=3D"auto">If/when the NTP spec is updated so =
that it can use measured on-path delay, it would be able to benefit from RT=
M as well - as I see it, without any substantial changes to this spec.</div=
><div dir=3D"auto"><br></div><div dir=3D"auto">Hopefully this helps.=C2=A0<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">My 2c,</div><div dir=3D"=
auto">Sasha</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Feb 27, 2017 21:41, &quot;Eric Gray&quot; &lt;<a href=3D"mailto:er=
ic.gray@ericsson.com">eric.gray@ericsson.com</a>&gt; wrote:<br type=3D"attr=
ibution"><blockquote class=3D"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_4064014040395874452WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Spencer,<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"><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">=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 While the reference to NTP is forwa=
rd looking (as Greg suggested) =E2=80=93 there is no strong reason to suspe=
ct that additional work relative to this specification
 will _<i>necessarily</i>_ be required.=C2=A0 <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"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:.5in"><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Transparent Clock (again=
 as Greg mentioned) has not yet been defined for NTP.<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"><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">=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 The essential element of transparen=
t clock is that there needs to be a way to determine the amount of time a m=
essage spends at each hop (this is the variable
 component of delay for any given path) so that this delay can be corrected=
 for.=C2=A0 The more hops for which you have this information, the more acc=
urate the corrected time values will be.<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"><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">=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 If you can determine the variable d=
elay experienced by a time message, you can combine this information with t=
he measurable fixed delay (associated mostly with
 light-speed delays) to provide a very precise corrected time value.<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"><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">=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 Transparent Clock is quite elegant =
in that sense, as long as it can be done without layer-violations.=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:Wingdings">J</span><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><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"><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">--<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">Eric<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"><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"> Spencer Dawkins at IETF [mailt=
o:<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spence=
rdawkins.ietf@<wbr>gmail.com</a>]
<br>
<b>Sent:</b> Monday, February 27, 2017 12:47 PM<br>
<b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:iesg@ietf.org" target=3D"_blank">iesg@ietf.org=
</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-<wbr>time@ietf.org</a>; Loa Andersson &lt=
;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;; <a href=
=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.org</a>=
; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<b>Subject:</b> Re: Spencer Dawkins&#39; No Objection on draft-ietf-mpls-re=
sidence-<wbr>time-14: (with COMMENT)<u></u><u></u></span></p><div class=3D"=
elided-text">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi, Greg,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Feb 27, 2017 11:13, &quot;Greg Mirsky&quot; &lt;<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi Spencer,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">yes, only PTP has defined operation of the transpare=
nt clock and how to use the residence time to improve accuracy of distribut=
ed time.<u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">(Remembering that this is a no-blocking comment)<u><=
/u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I&#39;d suggest removing the text reference to NTP i=
n the Introduction, and mentioning that you&#39;re allocating the value for=
 NTP in Section 7.2, but that NTP can&#39;t make use of this mechanism unle=
ss it adds support for transparent clock.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Does that make sense?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Spencer<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at =
IETF &lt;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank"=
>spencerdawkins.ietf@gmail.com</a><wbr>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi, Greg,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Feb 27, 2017 09:55, &quot;Greg Mirsky&quot; &lt;<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi Spencer,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for your thorough review and the question.=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NTP yet doesn&#39;t use transparent clock paradigm b=
ut in section 3=C2=A0<span style=3D"font-family:&quot;Arial&quot;,sans-seri=
f;color:black;background:#fffdf5">G-ACh for Residence Time Measurement we&#=
39;ve noted that NTP may be one type of TLV and have requested
 appropriate allocation by IANA in the new sub-registry=C2=A0MPLS RTM TLV R=
egistry (section 7.2). Thus, if NTP will be enhanced to use transparent clo=
ck, the RTM over MPLS will be capable to support it.</span><u></u><u></u></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:black;background:#fffdf5">We&#39;re open to your suggestions to m=
ake it clearer.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">So, is it correct to say that PTP is the only time p=
rotocol that uses the transparent clock paradigm today?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#888888"><u></u>=C2=A0<u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#888888">Spencer<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;background:#fffdf5">Kind regards,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:black;background:#fffdf5">Greg</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins &lt=
;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencer=
dawkins.ietf@gmail.com</a><wbr>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Spencer Dawkins has e=
ntered the following ballot position for<br>
draft-ietf-mpls-residence-<wbr>time-14: 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" target=3D"_blank">
https://www.ietf.org/iesg/<wbr>statement/discuss-criteria.<wbr>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-mpls-residence-time/=
" target=3D"_blank">https://datatracker.ietf.org/<wbr>doc/draft-ietf-mpls-r=
esidence-<wbr>time/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
</div>
</div>
</div></div>
</div>

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

--94eb2c055d18208d0505498945f2--


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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
Date: Mon, 27 Feb 2017 15:36:12 -0600
Message-ID: <CAKKJt-cPaS3wr=7NfJHMrFaPVKkdeD70w7+4Sb80ZiUJZV5w5g@mail.gmail.com>
To: Alexander Vainshtein <vainshtein.alex@gmail.com>
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Cc: draft-ietf-mpls-residence-time@ietf.org, mpls-chairs@ietf.org, iesg@ietf.org, mpls@ietf.org
Subject: Re: [mpls] Spencer Dawkins' No Objection on draft-ietf-mpls-residence-time-14: (with COMMENT)
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--001a11491fca5274c0054989deac
Content-Type: text/plain; charset=UTF-8
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Keeping in mind that these are non-blocking comments (so, do the right
thing) ...


On Feb 27, 2017 14:53, "Alexander Vainshtein" <vainshtein.alex@gmail.com>
wrote:

Spencer and all,
I concur with Eric.

The RTM mechanism defined in this spec does not depend on the protocol -
NPT, PTP or something else - that is carried over an LSP.


Right, and the Introduction starts out that way, but the Abstract calls out
PTP specifically, and a quick string search turns up 4 "NTP" strings and 70
"PTP" strings in the document (counting the table of contents but you get
the idea). That's probably what misled me.

But the good news is that I'm not likely to be your typical reader ;-)

Thanks,

Spencer

However, PTP by design can use the information about accummulated on-path
delay (the Correction field in its PDUs has been defined for just this
purpose), while NTP, in its present form, cannot do that.

If/when the NTP spec is updated so that it can use measured on-path delay,
it would be able to benefit from RTM as well - as I see it, without any
substantial changes to this spec.

Hopefully this helps.

My 2c,
Sasha

On Feb 27, 2017 21:41, "Eric Gray" <eric.gray@ericsson.com> wrote:

Spencer,



                While the reference to NTP is forward looking (as Greg
suggested) =E2=80=93 there is no strong reason to suspect that additional w=
ork
relative to this specification will _*necessarily*_ be required.



Transparent Clock (again as Greg mentioned) has not yet been defined for
NTP.



                The essential element of transparent clock is that there
needs to be a way to determine the amount of time a message spends at each
hop (this is the variable component of delay for any given path) so that
this delay can be corrected for.  The more hops for which you have this
information, the more accurate the corrected time values will be.



                If you can determine the variable delay experienced by a
time message, you can combine this information with the measurable fixed
delay (associated mostly with light-speed delays) to provide a very precise
corrected time value.



                Transparent Clock is quite elegant in that sense, as long
as it can be done without layer-violations.  J



--

Eric



*From:* Spencer Dawkins at IETF [mailto:spencerdawkins.ietf@gmail.com]
*Sent:* Monday, February 27, 2017 12:47 PM
*To:* Greg Mirsky <gregimirsky@gmail.com>
*Cc:* iesg@ietf.org; draft-ietf-mpls-residence-time@ietf.org; Loa Andersson
<loa@pi.nu>; mpls-chairs@ietf.org; mpls@ietf.org
*Subject:* Re: Spencer Dawkins' No Objection on
draft-ietf-mpls-residence-time-14: (with COMMENT)



Hi, Greg,



On Feb 27, 2017 11:13, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,

yes, only PTP has defined operation of the transparent clock and how to use
the residence time to improve accuracy of distributed time.



(Remembering that this is a no-blocking comment)



I'd suggest removing the text reference to NTP in the Introduction, and
mentioning that you're allocating the value for NTP in Section 7.2, but
that NTP can't make use of this mechanism unless it adds support for
transparent clock.



Does that make sense?



Spencer



Regards,

Greg



On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at IETF <
spencerdawkins.ietf@gmail.com> wrote:

Hi, Greg,



On Feb 27, 2017 09:55, "Greg Mirsky" <gregimirsky@gmail.com> wrote:

Hi Spencer,

thank you for your thorough review and the question.

NTP yet doesn't use transparent clock paradigm but in section 3 G-ACh for
Residence Time Measurement we've noted that NTP may be one type of TLV and
have requested appropriate allocation by IANA in the new sub-registry MPLS
RTM TLV Registry (section 7.2). Thus, if NTP will be enhanced to use
transparent clock, the RTM over MPLS will be capable to support it.

We're open to your suggestions to make it clearer.



So, is it correct to say that PTP is the only time protocol that uses the
transparent clock paradigm today?



Spencer



Kind regards,

Greg



On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins <
spencerdawkins.ietf@gmail.com> wrote:

Spencer Dawkins has entered the following ballot position for
draft-ietf-mpls-residence-time-14: 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-mpls-residence-time/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm a bit confused on one point. There's one reference to NTP in the
Introduction, everything else is about PTP, but the specification never
actually says if this mechanism is intended to be usable for NTP as well.
Could that be clearer?

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

<div dir=3D"auto">Keeping in mind that these are non-blocking comments (so,=
 do the right thing) ...<div><br><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Feb 27, 2017 14:53, &quot;Alexander Vainshtein&quot; &l=
t;<a href=3D"mailto:vainshtein.alex@gmail.com" target=3D"_blank">vainshtein=
.alex@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D=
"m_-271263781613700625quote" style=3D"margin:0 0 0 .8ex;border-left:1px #cc=
c solid;padding-left:1ex"><div dir=3D"auto">Spencer and all,<div dir=3D"aut=
o">I concur with Eric.</div><div dir=3D"auto"><br></div><div dir=3D"auto">T=
he RTM mechanism defined in this spec does not depend on the protocol - NPT=
, PTP or something else - that is carried over an LSP. </div></div></blockq=
uote></div></div></div><div dir=3D"auto"><br></div><div dir=3D"auto">Right,=
 and the Introduction starts out that way, but the Abstract calls out PTP s=
pecifically, and a quick string search turns up 4 &quot;NTP&quot; strings a=
nd 70 &quot;PTP&quot; strings in the document (counting the table of conten=
ts but you get the idea). That&#39;s probably what misled me.</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">But the good news is that I&#39;m not=
 likely to be your typical reader ;-)</div><div dir=3D"auto"><br></div><div=
 dir=3D"auto">Thanks,</div><div dir=3D"auto"><br></div><div dir=3D"auto">Sp=
encer</div><div dir=3D"auto"><br></div><div dir=3D"auto"><div class=3D"gmai=
l_extra"><div class=3D"gmail_quote"><blockquote class=3D"m_-271263781613700=
625quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><div dir=3D"auto"><div dir=3D"auto">However, PTP by design can use t=
he information about accummulated on-path delay (the Correction field in it=
s PDUs has been defined for just this purpose), while NTP, in its present f=
orm, cannot do that.</div><div dir=3D"auto"><br></div><div dir=3D"auto">If/=
when the NTP spec is updated so that it can use measured on-path delay, it =
would be able to benefit from RTM as well - as I see it, without any substa=
ntial changes to this spec.</div><div dir=3D"auto"><br></div><div dir=3D"au=
to">Hopefully this helps.=C2=A0</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">My 2c,</div><div dir=3D"auto">Sasha</div></div><div class=3D"m_-2=
71263781613700625elided-text"><div class=3D"gmail_extra"><br><div class=3D"=
gmail_quote">On Feb 27, 2017 21:41, &quot;Eric Gray&quot; &lt;<a href=3D"ma=
ilto:eric.gray@ericsson.com" target=3D"_blank">eric.gray@ericsson.com</a>&g=
t; wrote:<br type=3D"attribution"><blockquote class=3D"m_-27126378161370062=
5m_-7887972054912397428quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-271263781613700625m_-7887972054912397428m_4064014040395874=
452WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Spencer,<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"><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">=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 While the reference to NTP is forwa=
rd looking (as Greg suggested) =E2=80=93 there is no strong reason to suspe=
ct that additional work relative to this specification
 will _<i>necessarily</i>_ be required.=C2=A0 <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"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:.5in"><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Transparent Clock (again=
 as Greg mentioned) has not yet been defined for NTP.<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"><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">=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 The essential element of transparen=
t clock is that there needs to be a way to determine the amount of time a m=
essage spends at each hop (this is the variable
 component of delay for any given path) so that this delay can be corrected=
 for.=C2=A0 The more hops for which you have this information, the more acc=
urate the corrected time values will be.<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"><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">=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 If you can determine the variable d=
elay experienced by a time message, you can combine this information with t=
he measurable fixed delay (associated mostly with
 light-speed delays) to provide a very precise corrected time value.<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"><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">=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 Transparent Clock is quite elegant =
in that sense, as long as it can be done without layer-violations.=C2=A0
</span><span style=3D"font-size:11.0pt;font-family:Wingdings">J</span><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"><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"><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">--<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">Eric<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"><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"> Spencer Dawkins at IETF [mailt=
o:<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spence=
rdawkins.ietf@gm<wbr>ail.com</a>]
<br>
<b>Sent:</b> Monday, February 27, 2017 12:47 PM<br>
<b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:iesg@ietf.org" target=3D"_blank">iesg@ietf.org=
</a>; <a href=3D"mailto:draft-ietf-mpls-residence-time@ietf.org" target=3D"=
_blank">draft-ietf-mpls-residence-time<wbr>@ietf.org</a>; Loa Andersson &lt=
;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;; <a href=
=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chairs@ietf.org</a>=
; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<b>Subject:</b> Re: Spencer Dawkins&#39; No Objection on draft-ietf-mpls-re=
sidence-time<wbr>-14: (with COMMENT)<u></u><u></u></span></p><div class=3D"=
m_-271263781613700625m_-7887972054912397428elided-text">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi, Greg,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Feb 27, 2017 11:13, &quot;Greg Mirsky&quot; &lt;<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi Spencer,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">yes, only PTP has defined operation of the transpare=
nt clock and how to use the residence time to improve accuracy of distribut=
ed time.<u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">(Remembering that this is a no-blocking comment)<u><=
/u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I&#39;d suggest removing the text reference to NTP i=
n the Introduction, and mentioning that you&#39;re allocating the value for=
 NTP in Section 7.2, but that NTP can&#39;t make use of this mechanism unle=
ss it adds support for transparent clock.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Does that make sense?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Spencer<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Mon, Feb 27, 2017 at 9:06 AM, Spencer Dawkins at =
IETF &lt;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank"=
>spencerdawkins.ietf@gmail.com</a><wbr>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi, Greg,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Feb 27, 2017 09:55, &quot;Greg Mirsky&quot; &lt;<=
a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail=
.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal">Hi Spencer,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for your thorough review and the question.=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NTP yet doesn&#39;t use transparent clock paradigm b=
ut in section 3=C2=A0<span style=3D"font-family:&quot;Arial&quot;,sans-seri=
f;color:black;background:#fffdf5">G-ACh for Residence Time Measurement we&#=
39;ve noted that NTP may be one type of TLV and have requested
 appropriate allocation by IANA in the new sub-registry=C2=A0MPLS RTM TLV R=
egistry (section 7.2). Thus, if NTP will be enhanced to use transparent clo=
ck, the RTM over MPLS will be capable to support it.</span><u></u><u></u></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:black;background:#fffdf5">We&#39;re open to your suggestions to m=
ake it clearer.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">So, is it correct to say that PTP is the only time p=
rotocol that uses the transparent clock paradigm today?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#888888"><u></u>=C2=A0<u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#888888">Spencer<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;background:#fffdf5">Kind regards,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif;color:black;background:#fffdf5">Greg</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Sun, Feb 26, 2017 at 1:54 PM, Spencer Dawkins &lt=
;<a href=3D"mailto:spencerdawkins.ietf@gmail.com" target=3D"_blank">spencer=
dawkins.ietf@gmail.com</a><wbr>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Spencer Dawkins has e=
ntered the following ballot position for<br>
draft-ietf-mpls-residence-time<wbr>-14: 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" target=3D"_blank">
https://www.ietf.org/iesg/stat<wbr>ement/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-mpls-residence-time/=
" target=3D"_blank">https://datatracker.ietf.org/d<wbr>oc/draft-ietf-mpls-r=
esidence-t<wbr>ime/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
I&#39;m a bit confused on one point. There&#39;s one reference to NTP in th=
e<br>
Introduction, everything else is about PTP, but the specification never<br>
actually says if this mechanism is intended to be usable for NTP as well.<b=
r>
Could that be clearer?<br>
<br>
<u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
</div>
</div>
</div></div>
</div>

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

--001a11491fca5274c0054989deac--


From nobody Mon Feb 27 17:47:57 2017
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Subject: [mpls] =?utf-8?b?562U5aSNOiBSdGdEaXIgcmV2aWV3OiBkcmFmdC1pZXRmLW1w?= =?utf-8?q?ls-tp-shared-ring-protection-04=2Etxt?=
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Hi Mach,
Thank you very much for your valuable comments.
We authors will update the draft accordingly soon.

B.R.
Weiqiang Cheng

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Mach Chen [mailto:mach.chen@huawei.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2017=E5=B9=B42=E6=9C=8827=E6=97=A5 =
18:05
=E6=94=B6=E4=BB=B6=E4=BA=BA: 'rtg-ads@ietf.org'
=E6=8A=84=E9=80=81: 'rtg-dir@ietf.org'; =
'draft-ietf-mpls-tp-shared-ring-protection@ietf.org'; mpls@ietf.org
=E4=B8=BB=E9=A2=98: RtgDir review: =
draft-ietf-mpls-tp-shared-ring-protection-04.txt

Hello,=20

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 =
=E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir=20

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.=20

Document: draft-ietf-mpls-tp-shared-ring-protection-04.txt
 Reviewer: Mach Chen
 Review Date: 2017/2/23
 IETF LC End Date:=20
 Intended Status: Standards Track

Summary:=20
I have some minor concerns about this document that I think should be =
resolved before publication.=20

Comments:=20
This document may need some paragraph restructuration or adjustment to =
make it more readable, for example , before jumping into the detail of =
some processes, it's better to give some introduction to the scenarios =
and relevant conditions, and the used terms need to be defined before =
being used.=20

Major Issues:=20
No major issues found.

Minor Issues:=20

1.
The implicit fundamental pre-condition of the proposed MSRP is that, for =
each protected LSP, the egress and the  ingress LSR have to negotiate =
(or through NMS, or static configurations) the LSP label that will be =
pushed by the ingress. The label has to be a label that the egress must =
know how to handle it, otherwise, when the packet exits the ring tunnel, =
the packet will be mis-forwarded to non-intended node or dropped. This =
condition and probably the relevant mechanisms  should be explicitly =
pointed out and described in the document.=20

2.=20
Section 4.1
The Figure of "the logical layers of the ring" shows the innermost =
service is PW, is this document only applies to PW or other applications =
will be included. If it's later, some modifications are needed, and you =
need to check the whole document to make the relevant descriptions and =
usages consistent.=20
Figure 2 has the same problem.=20

3.
Section 4.1.3
s/The clockwise working ring tunnel label RcW_D/ The clockwise working =
ring tunnel label of RcW_D And since RcW_D identifies a ring tunnel, not =
a label, and the author seems intend to use RcW_D(X) to identify a ring =
tunnel label, I'd suggest to add some clarification text to this =
notation.

4.=20
Section 4.4.1
Suggest to move Figure 11 to under "Bullet  1.  Single-node =
interconnected rings."

5.=20
Section 4.4.4, the penultimate paragraph =
"...LSP1->R1cW_F&A(D)->R1aP_F&A(D->C->B->A)->R2cW_I(A->F->G->H->I)->LSP1.=
", what's reason to add "R1cW_F&A(D)" into the switching path? Seems =
it's redundant.

6.
Section 4.4.3,
In my understanding, the ring tunnels to virtual interconnected group =
are shared by all LSPs that needed to be forwarded to other rings, =
right? If so, it's better to add some text to explicitly state this.


7.=20
Section 5.1
"   When the failure has cleared and the Wait-to-Restore (WTR) timer has
   expired, the nodes sourcing RPS requests MUST drop their respective
   switches (tail end) and MUST source an RPS request carrying the NR
   code.  The node receiving from both directions such an RPS request
   (head end) MUST drop its protection switches."

Above text introduces the "tail end" and "Head end" tems, but the =
document does not have detail definition and introduction to these =
terms. Suggest to give the definition of these term in the terminology =
and notation section.

8.=20
Section 5.1
"A destination node is a node that is adjacent to a node that
   identified a failed link."

Based on the above text, the "destination node" cannot be uniquely =
determined, since a node in a ring has two adjacent nodes. Some =
clarification or more accurate description is needed.

9.=20
Section 5.1.2
s/sane ring/same ring

10.
Section 5.1.3.  Ring Node RPS States

Are those RPS states per node or per ring tunnel or per egress?  =
Whatever for either case, the document should state it explicitly.

And according to the explanation of each state, seems that the states =
are mutex each other. Considering the steering mode, seems that a node =
may be at both switching and pass-through state, right?

BTW, for those RPS codes, it's better to add a reference to the section =
(Section 5.2.1.1) to give a hint to the reader that there will be =
detailed explanation in the following sections.

11.=20
Section 5.1.3.2

"A node in the switching state MUST terminate RPS requests flow in
   both directions."

If a node in the switching state terminates RPS requests, how does the =
steering switching mode work?

12.=20
Section 5.1.  RPS Protocol
"The described RPS protocol uses the short-
   wrapping mechanism described in section 4.3.2 as an example."
Are there any differences when the RPS protocol used for wrapping and =
steering, if no, it should be stated clearly. Otherwise, it needs to =
specify the differences, or for each switching mode, define its =
procedures and state machine.

13.
Section 5.1.3.2.  Switching State,

The third paragraph describes the rules in case of unidirectional =
failure, but reader can not recognized this only when read the next =
paragraph. This section needs some restructure to make it more readable. =
BTW, since there are differences between unidirectional failure and =
bidirectional failure, there need some text to describe the rules and =
procedures for the bidirectional case IMHO

14.
Section 5.2.2.  Initial States
a)
It just lists a table and let the reader to guess the meaning, it's =
better to add some clarification text to help the reader understand the =
meaning and intention.

b)
In addition:

           |  B  |  Pass-through               |  N/A           |
            |     |   Working: no switch        |                |
            |     |   Protection: pass through  |                |
For pass-through state, why the working and protection tunnel states are =
different?

c)
|  D  |  Idle - LW                  |  NR            |=20

What is the LW?  I guess it means "Lock of Working", but it needs to be =
expanded it when first use.=20

Best regards,
Mach




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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/h5-UegAILM12wxSKkz02DAzY1C0>
Subject: [mpls] MPLS + SDN + NFV World :  Interop showcase details
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As each year the EANTC and Upperside Conferences invite interested vendors
to a public multi-vendor interoperability test and showcase.
Core topics for the upcoming edition include: SR, EVPNs, VxLAN, NETCONF,
Optical Ethernet, LTE and 5G backhaul.
Interop to be showcased next 21/24 March in Paris.
More info.:   <http://www.uppersideconferences.com/mpls-sdn-nfv/>
http://www.uppersideconferences.com/mpls-sdn-nfv/
 
 

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UnhideWhenUsed=3D"true" Name=3D"Table List 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 4"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 5"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 6"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 7"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table List 8"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table 3D effects 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Contemporary"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Elegant"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Professional"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Subtle 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 2"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Web 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Balloon Text"/>
<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Table Theme"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder =
Text"/>
<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" =
Name=3D"No Spacing"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful =
List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful =
Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" =
Name=3D"List Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" =
Name=3D"Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" =
Name=3D"Intense Quote"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading =
1 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading =
2 Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful =
Shading Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"19" QFormat=3D"true" =
Name=3D"Subtle Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"21" QFormat=3D"true" =
Name=3D"Intense Emphasis"/>
<w:LsdException Locked=3D"false" Priority=3D"31" QFormat=3D"true" =
Name=3D"Subtle Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"32" QFormat=3D"true" =
Name=3D"Intense Reference"/>
<w:LsdException Locked=3D"false" Priority=3D"33" QFormat=3D"true" =
Name=3D"Book Title"/>
<w:LsdException Locked=3D"false" Priority=3D"37" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" Name=3D"Bibliography"/>
<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" =
UnhideWhenUsed=3D"true" QFormat=3D"true" Name=3D"TOC Heading"/>
<w:LsdException Locked=3D"false" Priority=3D"41" Name=3D"Plain Table =
1"/>
<w:LsdException Locked=3D"false" Priority=3D"42" Name=3D"Plain Table =
2"/>
<w:LsdException Locked=3D"false" Priority=3D"43" Name=3D"Plain Table =
3"/>
<w:LsdException Locked=3D"false" Priority=3D"44" Name=3D"Plain Table =
4"/>
<w:LsdException Locked=3D"false" Priority=3D"45" Name=3D"Plain Table =
5"/>
<w:LsdException Locked=3D"false" Priority=3D"40" Name=3D"Grid Table =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 4"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 5"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"Grid Table 1 =
Light Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"Grid Table 2 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"Grid Table 3 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"Grid Table 4 =
Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"Grid Table 5 =
Dark Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"Grid Table 6 =
Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"Grid Table 7 =
Colorful Accent 6"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 =
Light"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 =
Dark"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 =
Colorful"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 =
Light Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4 =
Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 =
Dark Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 =
Colorful Accent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 =
Light Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"48" Name=3D"List Table 3 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"49" Name=3D"List Table 4 =
Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"50" Name=3D"List Table 5 =
Dark Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"51" Name=3D"List Table 6 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"52" Name=3D"List Table 7 =
Colorful Accent 2"/>
<w:LsdException Locked=3D"false" Priority=3D"46" Name=3D"List Table 1 =
Light Accent 3"/>
<w:LsdException Locked=3D"false" Priority=3D"47" Name=3D"List Table 2 =
Accent 3"/>
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------=_NextPart_000_0017_01D291DC.C5833A30--



From nobody Tue Feb 28 10:13:45 2017
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From: Stewart Bryant <stewart@g3ysx.org.uk>
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Cc: mpls@ietf.org, draft-ietf-mpls-tp-temporal-hitless-psm.all@ietf.org, ietf@ietf.org
Subject: [mpls] Review of draft-ietf-mpls-tp-temporal-hitless-psm-12
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Reviewer: Stewart Bryant
Review result: Almost 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 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-mpls-tp-temporal-hitless-psm-??
Reviewer: Stewart Bryant
Review Date: 2017-02-28
IETF LC End Date: 2017-03-03
IESG Telechat date: 2017-03-16

Summary:

This document is a valid critique of the existing MPLS SPM design, and
sets out a list of requirements that were called up at the time of its
design but not met. As such this is a valid set of requirements. What
is unclear is whether it is feasible to meet the requirements set out
in this document, and if so whether or not this will require a change
to the MPLS architecture. It would be useful to the reader to clarify
the feasibility of a solution in order not to set false expectations.

Major issues:

The title is "Hitless path segment monitoring".  I read the document
hoping to find that this was a solution. It is not, it is a
requirements text and really ought to be titled as such.

Whilst this text describes a list of issues with the existing IETF
design, it should be remembered that the design was the best that
could be accomplished at the time within the constraints of the MPLS
architecture. So that leaves the reader with a question: do the
authors now have an insight into how a solution can now be designed to
meet the requirement,  or do the authors intend to propose a change to
the MPLS architecture, or is the intention to publish this to state
the requirements in the hope that someone will eventually propose a
solution?

The text  says:

"In particular, performance monitoring measurements (e.g.  Delay
Measurement and Packet Loss  Measurement) are sensitive to these
changes."

Whilst technically true, I am not sure the impact on delay is
significant in any engineering sense. We are talking four bytes per
packet over a service that is going at 1 to 400 Gb/s. Again it is hard
to imagine a significant impact on loss. If this is a key point it
need some justification from an engineering perspective.

In Figure 5 it is unclear what the difference between the first and
second on-demand point is. Is this a reference to input and output
interface monitoring. If  so I think that this should be made clear,
together with a note that a lot of MPLS forwarding designs find this
difficult to achieve. 

The text around Figure 8 explains the deficiency in TTL based section
of an OAM monitoring point in MPLS. However the authors give no
indication of a feasible alternative. Do they have one in mind?

Minor issues: None

Nits/editorial comments: 
     From ID-Nits: The abstract seems to contain references
([RFC6371]), which it
     shouldn't.  Please replace those with straight textual mentions
of the
     documents in question.

For exampla in OTN, TCM allows the insertion - Typo example


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To: David Sinicrope <david.sinicrope@ericsson.com>, "draft-ietf-mpls-tp-temporal-hitless-psm.all@ietf.org" <draft-ietf-mpls-tp-temporal-hitless-psm.all@ietf.org>
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From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] Shepherd Writeup update for draft-ietf-mpls-tp-temporal-hitless-psm-12
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David,

I'm mostly a OK with this update to the Shwphwrérs Write-Up. A few very
small nits inline.

On 2017-03-01 04:15, David Sinicrope wrote:
> The last Shepherd writeup of this draft was from Dec 2015 (v8 and v9 of
> the document).
>
> The text below is intended to update that writeup based on v12 of the
> document.
>
>
>
> Let me know if you have any questions.
>
> Thanks,
>
> Dave
>
>
>
> (1) What type of RFC is being requested (BCP, Proposed Standard,
>
> Internet Standard, Informational, Experimental, or Historic)?  Why
>
> is this the proper type of RFC?  Is this type of RFC indicated in the
>
> title page header?
>
>
>
>   Informational. This is indicated on the title page header, and is
>
>    appropriate since this document specifies requirements for future work.
>
>
>
> (2) The IESG approval announcement includes a Document Announcement
>
> Write-Up. Please provide such a Document Announcement Write-Up. Recent
>
> examples can be found in the "Action" announcements for approved
>
> documents. The approval announcement contains the following sections:
>
>
>
> Technical Summary
>
>
>
>    The MPLS transport profile (MPLS-TP) includes OAM functions which enable
>
>    maintenance tools that may be used by network operators and service
> providers
>
>    for fault location, survivability, performance monitoring, in-service
> and out-
>
>    of-service measurements.  Based on identified problems, this document
> provides
>
>    considerations for the specification of new requirements to consider
> a new
>
>    improved mechanism for hitless transport path segment monitoring to
> be named
>
>    Enhanced Path Segment Monitoring (EPSM).
>
>
>
> Working Group Summary
>
>
>
>    WG progress was relatively smooth with no controversy.
>
>
>
> Document Quality
>
>
>
>    The document has been well reviewed by the WG and also as mentioned
> below,
>
>    and updated accordingly.

This sentence does not read well. Did you intend to mention that it has
been reviewed by SG15?

As a requirements document it does not
> specify any
>
>    protocol to be implemented, but rather specifies requirements which
> will be used
>
>    to guide future work.
>
>
>
> Personnel
>
>
>
> David Sinicrope is the current Document Shepherd, taking over from Ross
> Callon. Deborah Brungard is the Responsible Area
>
>    Director.
>
>
I think there is a script extending Shepherd and AD (but I might be
wrong), but I use the format:

    David Sinicrope is the current Document Shepherd.
    Deborah Brungard is the Responsible Area Director.

You might add an extra sentence mentioning that you taken over from
Ross.

>
> (3) Briefly describe the review of this document that was performed by
>
> the Document Shepherd.  If this version of the document is not ready
>
> for publication, please explain why the document is being forwarded to
>
> the IESG.
>
>
>
>    The document shepherd has reviewed the document, and the document
>
>    has been updated in response to his comments.  At WG chair request Huub

hmmm - sent the request to Huub, but I think I did it as a co-author.
>
>    van Helvoort has also done a grammatical review of the document. In
> addition Rtg Dir Review was performed and liaisons to ITU-T SG15
> generated to inform them of the draft and its intent to describe
> different MPLS-TP OAM requirements those communicated from ITU-T previously.
>
>
>
> (4) Does the document Shepherd have any concerns about the depth or
>
> breadth of the reviews that have been performed?
>
>
>
>    no concerns.
>
>
>
> (5) Do portions of the document need review from a particular or from
>
> broader perspective, e.g., security, operational complexity, AAA, DNS,
>
> DHCP, XML, or internationalization? If so, describe the review that
>
> took place.
>
>
>
>    no additional review needed.
>
>
>
> (6) Describe any specific concerns or issues that the Document Shepherd
>
> has with this document that the Responsible Area Director and/or the
>
> IESG should be aware of? For example, perhaps he or she is uncomfortable
>
> with certain parts of the document, or has concerns whether there really
>
> is a need for it. In any event, if the WG has discussed those issues and
>
> has indicated that it still wishes to advance the document, detail those
>
> concerns here.
>
>
>
>    While no explicit concerns, it should be noted that the document
> entertains “analysis of existing MPLS-TP OAM mechanisms” and “provides
> requirements to guide development of new OAM tools” on a topic where
> requirements were established, led and communicated from ITU-T SG15.
>   There has been liaison activity related to this topic and I-D dating
> back to 2010 with https://datatracker.ietf.org/liaison/917/.   Continued
> open communication with ITU-T SG15 should be maintained to ensure
> continuity and migration from existing requirements and solutions.
>
>
>
> (7) Has each author confirmed that any and all appropriate IPR
>
> disclosures required for full conformance with the provisions of BCP 78
>
> and BCP 79 have already been filed. If not, explain why.
>
>
>
>    Yes. (this is being reconfirmed for the latest revision)
>
>
>
> (8) Has an IPR disclosure been filed that references this document?
>
> If so, summarize any WG discussion and conclusion regarding the IPR
>
> disclosures.
>
>
>
>    No IPR disclosures have been filed that reference this document.
>
>
>
> (9) How solid is the WG consensus behind this document? Does it
>
> represent the strong concurrence of a few individuals, with others
>
> being silent, or does the WG as a whole understand and agree with it?
>
>
>
> Rough consensus. The document has been progressing slowly for quite a
> while and there was positive response to the WGLC with no objections
> albeit from a small handful of people, mostly from the author’s
> affiliations.
>
>
>
> (10) Has anyone threatened an appeal or otherwise indicated extreme
>
> discontent? If so, please summarise the areas of conflict in separate
>
> email messages to the Responsible Area Director. (It should be in a
>
> separate email because this questionnaire is publicly available.)
>
>
>
>    No discontent or objection, just caution as noted by the comments
> regarding ITU-T above.
>
>
>
> (11) Identify any ID nits the Document Shepherd has found in this
>
> document. (See https://www.ietf.org/tools/idnits/ and the Internet-Drafts
>
> Checklist). Boilerplate checks are not enough; this check needs to be
>
> thorough.
>
>
>
>    IDnits pointed to a few minor issues which should be corrected in v12.

There is actually one error in version -12, there is a reference in the
abstract, [6371] should be removed, so that we mention RFC 6371 only. I
think it would be possible to do this at the next round of feedback.
>
>
>
> (12) Describe how the document meets any required formal review
>
> criteria, such as the MIB Doctor, media type, and URI type reviews.
>
>
>
>    Not applicable.
>
>
>
> (13) Have all references within this document been identified as
>
> either normative or informative?
>
>
>
>    Yes. It should be noted that there are M#/Mandatory requirements made
> to informative references.

I don't quite get this, did you intend to say that references to 
Informational RFCs in earlier versions has no been moved ti Informative?

/Loa
>
>
>
> (14) Are there normative references to documents that are not ready for
>
> advancement or are otherwise in an unclear state? If such normative
>
> references exist, what is the plan for their completion?
>
>
>
>    All references are to published RFCs.
>
>
>
> (15) Are there downward normative references references (see RFC 3967)?
>
> If so, list these downward references to support the Area Director in
>
> the Last Call procedure.
>
>
>
>    No downrefs. Earlier versions of the document did have downrefs but
> it was
>
>    clear that these should have been informative references, and the
> document
>
>    was updated accordingly.
>
>
>
> (16) Will publication of this document change the status of any
>
> existing RFCs? Are those RFCs listed on the title page header, listed
>
> in the abstract, and discussed in the introduction? If the RFCs are not
>
> listed in the Abstract and Introduction, explain why, and point to the
>
> part of the document where the relationship of this document to the
>
> other RFCs is discussed. If this information is not in the document,
>
> explain why the WG considers it unnecessary.
>
>
>
>    not applicable.
>
>
>
> (17) Describe the Document Shepherd's review of the IANA considerations
>
> section, especially with regard to its consistency with the body of the
>
> document. Confirm that all protocol extensions that the document makes
>
> are associated with the appropriate reservations in IANA registries.
>
> Confirm that any referenced IANA registries have been clearly
>
> identified. Confirm that newly created IANA registries include a
>
> detailed specification of the initial contents for the registry, that
>
> allocations procedures for future registrations are defined, and a
>
> reasonable name for the new registry has been suggested (see RFC 5226).
>
>
>
>    There are no requests for IANA actions in this document. This is
> appropriate.
>
>
>
> (18) List any new IANA registries that require Expert Review for future
>
> allocations. Provide any public guidance that the IESG would find
>
> useful in selecting the IANA Experts for these new registries.
>
>
>
>    There are no requests for IANA actions in this document.
>
>
>
> (19) Describe reviews and automated checks performed by the Document
>
> Shepherd to validate sections of the document written in a formal
>
> language, such as XML code, BNF rules, MIB definitions, etc.
>
>
>
>    not applicable.
>
>
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

