
From nobody Sun Mar  1 17:41:16 2015
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From: "John G. Scudder" <jgs@juniper.net>
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Cc: "<bruno.decraene@orange.com>" <bruno.decraene@orange.com>
Subject: [spring] IETF-92 agenda topics
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Folks,

SPRING will meet at IETF-92 on Thursday, March 26, from 5:40 to 6:40.  =
Please forward any SPRING agenda items you might have to Bruno and me.  =
The deadline is March 9 (a week from Monday) by 10:00 U.S. Eastern Time. =
 Priority will be given to those who get their requests in by the =
deadline, though if agenda space permits it we will consider requests =
gotten in before March 16 at 10:00 U.S. Eastern Time.

We have a short meeting slot this time, so it is quite possible we may =
not be able to accommodate all requests. I apologize in advance if your =
request has to be declined. We'll give preference to work that directly =
advances the WG charter, especially charter items at risk of slipping, =
and to work that requires interactive discussion rather than status =
reports or presentations of results. Please keep in mind that the =
mailing list is always available for such reports and we encourage you =
to use it.

If you have previously presented on your topic at a SPRING meeting, =
please explain in your request what you hope to achieve with your =
presentation this time. If you have requested to present the same work =
at multiple WGs, please note this so that we can coordinate as needed.

You should plan to send your slides to Bruno and me no later than 24 =
hours prior to the meeting, though again, earlier is better. If we don't =
have your slides by the deadline, you may lose your slot. Please number =
your slides for the benefit of remote attendees, and if you plan to use =
any fancy builds or transitions you must arrange this with us in advance =
-- otherwise you should assume your slides may be converted to PDF and =
presented from the PDF.

Finally, if you request an agenda slot, please do so by replying to this =
message, making sure to include both Bruno and me in the To: or Cc: and =
don't change the subject line. Please include the name of the person who =
will be presenting and give an estimate for how much time you think =
you'll need (including Q/A).

Thanks,

--John & Bruno=


From nobody Mon Mar  2 18:25:56 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
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Thread-Topic: New Version Notification for draft-xu-spring-islands-connection-over-ip-04.txt
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From nobody Tue Mar  3 19:30:54 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
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To: Xuxiaohu <xuxiaohu@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>, "<spring@ietf.org>" <spring@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
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From nobody Wed Mar  4 08:41:01 2015
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>, "<spring@ietf.org>" <spring@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
Thread-Index: AQHQViqf+3y6NXpdeEGpQGeCsEhFG50LqPsAgAAGTiCAAMftMA==
Date: Wed, 4 Mar 2015 16:40:55 +0000
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Subject: Re: [spring] [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Xiaohu,

I read your latest draft and I do see the elegance of describing a sequence=
 of must-visit nodes as a stack of MPLS labels.   And I see that you've add=
ressed the transport-independence requirement by stating that the MPLS fram=
es could be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I =
have a couple of issues that I suggest be addressed.

First, the text is written as if the NSH header is optional and present onl=
y if metadata is required.    The SFC architecture is such that the NSH is =
mandatory.   I think this issue can be combined with the second issue that =
I'll raise below.

Second, the notion is that the SFF's strip the label stack and then restore=
 the label stack.    And since the text states that even when NSH is presen=
t, the SFP ID is not used, the only remaining basis to do this is flow lear=
ning in the SFF.    While I think there are many reasons that may cause SFF=
's to utilize flow learning advantageously, it should not be a fundamental =
necessity to realize an SFF, IMO.   But even if the SFF is a flow learner, =
this is still inadequate since the SF may change the 5-tuple (e.g., NAT) or=
 may launch internally generated flows (e.g., HTTP proxy).   Both cases cou=
ld not be satisfied by flow learning.

What I suggest, instead, is a tighter coupling between the NSH header and t=
he MPLS label stack.   That there be a 1:1 equivalency between {SFP ID, SFP=
 hop index} and the label stack.   Thus, when the SFC-aware SF returns a pa=
cket to the SFF, the {SFP ID, SFP hop index} contained in the NSH be used t=
o push the appropriate label stack onto the packet.    I believe this would=
 bring the approach into conformance with the SFC architectural requirement=
s (mandatory NSH, transport independence) and would solve the problems with=
 flow learning identified above.

   Ron



-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Tuesday, March 3, 2015 11:10 PM
To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
Subject: Re: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spr=
ing-02.txt

The rationales for leveraging the MPLS-SPRING mechanism to realize the serv=
ice path layer functionality of the service function chaining are as follow=
s:

1) eliminate the SFC/SFP states on SFFs. This follows the same logic as MPL=
S-SPRING and BIER.
2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a maximum =
extent. This follows the Transport Derived SFF concept as described in Sect=
ion 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned with t=
he current SFC charter, e.g., "...The working group will consider using an =
existing encapsulation (with extensions as appropriate) if a suitable candi=
date is found..."
3) seamlessly support the SFC in a multi-tenant environment (e.g., MPLS VPN=
). For example, the MPLS VPN packet (containing metadata) could be further =
imposed with a label stack which indicates an SFC or SFP associated with th=
at packet. SFFs receiving the above packet would strip the whole label stac=
k and then send the payload of the MPLS packet (with metadata) to the corre=
sponding SFs which are tenant-aware and therefore easily could determine th=
e tenant profile according to the tenant info contained in the metadata (a.=
k.a., the NSH).=20

Best regards,
Xiaohu
=20

> -----Original Message-----
> From: Xuxiaohu
> Sent: Wednesday, March 04, 2015 11:31 AM
> To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
> Subject: FW: New Version Notification for=20
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Hi all,
>=20
> This document describes how to leverage the MPLS-based source routing=20
> (i.e.,
> MPLS-SPRING) mechanism as developed by the SPRING WG to realize the=20
> service path layer functionality of the service function chaining. In=20
> addition, this document also describes how to carry metadata in an=20
> MPLS packet by using the NSH as a metadata container.
>=20
> Any comments are suggestions are welcome.
>=20
> Best regards,
> Xiaohu
>=20
> > -----Original Message-----
> > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > Sent: Wednesday, March 04, 2015 11:24 AM
> > To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;=20
> > Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
> > Subject: New Version Notification for=20
> > draft-xu-sfc-using-mpls-spring-02.txt
> >
> >
> > A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
> > has been successfully submitted by Xiaohu Xu and posted to the IETF
> repository.
> >
> > Name:		draft-xu-sfc-using-mpls-spring
> > Revision:	02
> > Title:		Service Function Chaining Using MPLS-SPRING
> > Document date:	2015-03-03
> > Group:		Individual Submission
> > Pages:		8
> > URL:
> > http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring-02.
> > txt
> > Status:
> > https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
> > Htmlized:       http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spri=
ng-02
> > Diff:
> > http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring-02
> >
> > Abstract:
> >    Source Packet Routing in Networking (SPRING) WG specifies a special
> >    source routing mechanism.  Such source routing mechanism can be
> >    leveraged to realize the service path layer functionality of the
> >    service function chaining (i.e, steering traffic through a particula=
r
> >    service function path) by encoding the service function path or the
> >    service function chain information as the explicit path information.
> >    This document describes how to leverage the MPLS-based source routin=
g
> >    mechanism as developed by the SPRING WG to realize the service path
> >    layer functionality of the service function chaining.
> >
> >
> >
> >
> > Please note that it may take a couple of minutes from the time of=20
> > submission until the htmlized version and diff are available at tools.i=
etf.org.
> >
> > The IETF Secretariat

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


From nobody Wed Mar  4 17:58:54 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>, "<spring@ietf.org>" <spring@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Date: Thu, 5 Mar 2015 01:58:39 +0000
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References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0830F7C0@NKGEML512-MBS.china.huawei.com> <CDF2F015F4429F458815ED2A6C2B6B0B2E855978@MBX021-W3-CA-2.exch021.domain.local>
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Subject: Re: [spring] [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Hi Ron,

Thanks a lot for your insightful comments and suggestions. By the way, in t=
he case where there is no need to deliver metadata, does it mean the NSH ju=
st only needs to be contained the packets exchanged between SFFs and SFs? I=
n other words, the NSH is used as a way for the SFF to retrieve the label s=
tack which has been stripped by that SFF before.

Best regards,
Xiaohu=20

> -----Original Message-----
> From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
> Sent: Thursday, March 05, 2015 12:41 AM
> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> Subject: RE: [sfc] New Version Notification for
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Xiaohu,
>=20
> I read your latest draft and I do see the elegance of describing a sequen=
ce of
> must-visit nodes as a stack of MPLS labels.   And I see that you've addre=
ssed
> the transport-independence requirement by stating that the MPLS frames co=
uld
> be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I have a =
couple of
> issues that I suggest be addressed.
>=20
> First, the text is written as if the NSH header is optional and present o=
nly if
> metadata is required.    The SFC architecture is such that the NSH is
> mandatory.   I think this issue can be combined with the second issue tha=
t I'll
> raise below.
>=20
> Second, the notion is that the SFF's strip the label stack and then resto=
re the
> label stack.    And since the text states that even when NSH is present, =
the SFP
> ID is not used, the only remaining basis to do this is flow learning in t=
he SFF.
> While I think there are many reasons that may cause SFF's to utilize flow
> learning advantageously, it should not be a fundamental necessity to real=
ize an
> SFF, IMO.   But even if the SFF is a flow learner, this is still inadequa=
te since the
> SF may change the 5-tuple (e.g., NAT) or may launch internally generated =
flows
> (e.g., HTTP proxy).   Both cases could not be satisfied by flow learning.
>=20
> What I suggest, instead, is a tighter coupling between the NSH header and=
 the
> MPLS label stack.   That there be a 1:1 equivalency between {SFP ID, SFP =
hop
> index} and the label stack.   Thus, when the SFC-aware SF returns a packe=
t to
> the SFF, the {SFP ID, SFP hop index} contained in the NSH be used to push=
 the
> appropriate label stack onto the packet.    I believe this would bring th=
e
> approach into conformance with the SFC architectural requirements
> (mandatory NSH, transport independence) and would solve the problems with
> flow learning identified above.
>=20
>    Ron
>=20
>=20
>=20
> -----Original Message-----
> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
> Sent: Tuesday, March 3, 2015 11:10 PM
> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> Subject: Re: [sfc] New Version Notification for
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> The rationales for leveraging the MPLS-SPRING mechanism to realize the se=
rvice
> path layer functionality of the service function chaining are as follows:
>=20
> 1) eliminate the SFC/SFP states on SFFs. This follows the same logic as
> MPLS-SPRING and BIER.
> 2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a maximu=
m
> extent. This follows the Transport Derived SFF concept as described in Se=
ction
> 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned with the=
 current
> SFC charter, e.g., "...The working group will consider using an existing
> encapsulation (with extensions as appropriate) if a suitable candidate is=
 found..."
> 3) seamlessly support the SFC in a multi-tenant environment (e.g., MPLS V=
PN).
> For example, the MPLS VPN packet (containing metadata) could be further
> imposed with a label stack which indicates an SFC or SFP associated with =
that
> packet. SFFs receiving the above packet would strip the whole label stack=
 and
> then send the payload of the MPLS packet (with metadata) to the correspon=
ding
> SFs which are tenant-aware and therefore easily could determine the tenan=
t
> profile according to the tenant info contained in the metadata (a.k.a., t=
he NSH).
>=20
> Best regards,
> Xiaohu
>=20
>=20
> > -----Original Message-----
> > From: Xuxiaohu
> > Sent: Wednesday, March 04, 2015 11:31 AM
> > To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
> > Subject: FW: New Version Notification for
> > draft-xu-sfc-using-mpls-spring-02.txt
> >
> > Hi all,
> >
> > This document describes how to leverage the MPLS-based source routing
> > (i.e.,
> > MPLS-SPRING) mechanism as developed by the SPRING WG to realize the
> > service path layer functionality of the service function chaining. In
> > addition, this document also describes how to carry metadata in an
> > MPLS packet by using the NSH as a metadata container.
> >
> > Any comments are suggestions are welcome.
> >
> > Best regards,
> > Xiaohu
> >
> > > -----Original Message-----
> > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > Sent: Wednesday, March 04, 2015 11:24 AM
> > > To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;
> > > Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
> > > Subject: New Version Notification for
> > > draft-xu-sfc-using-mpls-spring-02.txt
> > >
> > >
> > > A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
> > > has been successfully submitted by Xiaohu Xu and posted to the IETF
> > repository.
> > >
> > > Name:		draft-xu-sfc-using-mpls-spring
> > > Revision:	02
> > > Title:		Service Function Chaining Using MPLS-SPRING
> > > Document date:	2015-03-03
> > > Group:		Individual Submission
> > > Pages:		8
> > > URL:
> > > http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring-02=
.
> > > txt
> > > Status:
> > > https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
> > > Htmlized:
> http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-02
> > > Diff:
> > > http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring-02
> > >
> > > Abstract:
> > >    Source Packet Routing in Networking (SPRING) WG specifies a specia=
l
> > >    source routing mechanism.  Such source routing mechanism can be
> > >    leveraged to realize the service path layer functionality of the
> > >    service function chaining (i.e, steering traffic through a particu=
lar
> > >    service function path) by encoding the service function path or th=
e
> > >    service function chain information as the explicit path informatio=
n.
> > >    This document describes how to leverage the MPLS-based source
> routing
> > >    mechanism as developed by the SPRING WG to realize the service pat=
h
> > >    layer functionality of the service function chaining.
> > >
> > >
> > >
> > >
> > > 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.
> > >
> > > The IETF Secretariat
>=20
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


From nobody Wed Mar  4 18:20:17 2015
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
Thread-Index: AQHQViqf+3y6NXpdeEGpQGeCsEhFG50LqPsAgAAGTiCAAMftMIABMl2A//9/6A8=
Date: Thu, 5 Mar 2015 02:20:11 +0000
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References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0830F7C0@NKGEML512-MBS.china.huawei.com> <CDF2F015F4429F458815ED2A6C2B6B0B2E855978@MBX021-W3-CA-2.exch021.domain.local>, <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE0830FC8E@NKGEML512-MBS.china.huawei.com>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "<spring@ietf.org>" <spring@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [spring] [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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I think it needs to be there between SFF's, too.  In the case where there i=
s no metadata, you could argue that the data in NSH and the label stack are=
 redundantly saying the same thing, but an optimization along these lines w=
ould not be justified, IMO.

   Ron


> On Mar 4, 2015, at 8:58 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
>=20
> Hi Ron,
>=20
> Thanks a lot for your insightful comments and suggestions. By the way, in=
 the case where there is no need to deliver metadata, does it mean the NSH =
just only needs to be contained the packets exchanged between SFFs and SFs?=
 In other words, the NSH is used as a way for the SFF to retrieve the label=
 stack which has been stripped by that SFF before.
>=20
> Best regards,
> Xiaohu=20
>=20
>> -----Original Message-----
>> From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
>> Sent: Thursday, March 05, 2015 12:41 AM
>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
>> Subject: RE: [sfc] New Version Notification for
>> draft-xu-sfc-using-mpls-spring-02.txt
>>=20
>> Xiaohu,
>>=20
>> I read your latest draft and I do see the elegance of describing a seque=
nce of
>> must-visit nodes as a stack of MPLS labels.   And I see that you've addr=
essed
>> the transport-independence requirement by stating that the MPLS frames c=
ould
>> be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I have a=
 couple of
>> issues that I suggest be addressed.
>>=20
>> First, the text is written as if the NSH header is optional and present =
only if
>> metadata is required.    The SFC architecture is such that the NSH is
>> mandatory.   I think this issue can be combined with the second issue th=
at I'll
>> raise below.
>>=20
>> Second, the notion is that the SFF's strip the label stack and then rest=
ore the
>> label stack.    And since the text states that even when NSH is present,=
 the SFP
>> ID is not used, the only remaining basis to do this is flow learning in =
the SFF.
>> While I think there are many reasons that may cause SFF's to utilize flo=
w
>> learning advantageously, it should not be a fundamental necessity to rea=
lize an
>> SFF, IMO.   But even if the SFF is a flow learner, this is still inadequ=
ate since the
>> SF may change the 5-tuple (e.g., NAT) or may launch internally generated=
 flows
>> (e.g., HTTP proxy).   Both cases could not be satisfied by flow learning=
.
>>=20
>> What I suggest, instead, is a tighter coupling between the NSH header an=
d the
>> MPLS label stack.   That there be a 1:1 equivalency between {SFP ID, SFP=
 hop
>> index} and the label stack.   Thus, when the SFC-aware SF returns a pack=
et to
>> the SFF, the {SFP ID, SFP hop index} contained in the NSH be used to pus=
h the
>> appropriate label stack onto the packet.    I believe this would bring t=
he
>> approach into conformance with the SFC architectural requirements
>> (mandatory NSH, transport independence) and would solve the problems wit=
h
>> flow learning identified above.
>>=20
>>   Ron
>>=20
>>=20
>>=20
>> -----Original Message-----
>> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
>> Sent: Tuesday, March 3, 2015 11:10 PM
>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
>> Subject: Re: [sfc] New Version Notification for
>> draft-xu-sfc-using-mpls-spring-02.txt
>>=20
>> The rationales for leveraging the MPLS-SPRING mechanism to realize the s=
ervice
>> path layer functionality of the service function chaining are as follows=
:
>>=20
>> 1) eliminate the SFC/SFP states on SFFs. This follows the same logic as
>> MPLS-SPRING and BIER.
>> 2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a maxim=
um
>> extent. This follows the Transport Derived SFF concept as described in S=
ection
>> 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned with th=
e current
>> SFC charter, e.g., "...The working group will consider using an existing
>> encapsulation (with extensions as appropriate) if a suitable candidate i=
s found..."
>> 3) seamlessly support the SFC in a multi-tenant environment (e.g., MPLS =
VPN).
>> For example, the MPLS VPN packet (containing metadata) could be further
>> imposed with a label stack which indicates an SFC or SFP associated with=
 that
>> packet. SFFs receiving the above packet would strip the whole label stac=
k and
>> then send the payload of the MPLS packet (with metadata) to the correspo=
nding
>> SFs which are tenant-aware and therefore easily could determine the tena=
nt
>> profile according to the tenant info contained in the metadata (a.k.a., =
the NSH).
>>=20
>> Best regards,
>> Xiaohu
>>=20
>>=20
>>> -----Original Message-----
>>> From: Xuxiaohu
>>> Sent: Wednesday, March 04, 2015 11:31 AM
>>> To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
>>> Subject: FW: New Version Notification for
>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>=20
>>> Hi all,
>>>=20
>>> This document describes how to leverage the MPLS-based source routing
>>> (i.e.,
>>> MPLS-SPRING) mechanism as developed by the SPRING WG to realize the
>>> service path layer functionality of the service function chaining. In
>>> addition, this document also describes how to carry metadata in an
>>> MPLS packet by using the NSH as a metadata container.
>>>=20
>>> Any comments are suggestions are welcome.
>>>=20
>>> Best regards,
>>> Xiaohu
>>>=20
>>>> -----Original Message-----
>>>> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>>>> Sent: Wednesday, March 04, 2015 11:24 AM
>>>> To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;
>>>> Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
>>>> Subject: New Version Notification for
>>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>>=20
>>>>=20
>>>> A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
>>>> has been successfully submitted by Xiaohu Xu and posted to the IETF
>>> repository.
>>>>=20
>>>> Name:        draft-xu-sfc-using-mpls-spring
>>>> Revision:    02
>>>> Title:        Service Function Chaining Using MPLS-SPRING
>>>> Document date:    2015-03-03
>>>> Group:        Individual Submission
>>>> Pages:        8
>>>> URL:
>>>> http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring-02.
>>>> txt
>>>> Status:
>>>> https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
>>>> Htmlized:
>> http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-02
>>>> Diff:
>>>> http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring-02
>>>>=20
>>>> Abstract:
>>>>   Source Packet Routing in Networking (SPRING) WG specifies a special
>>>>   source routing mechanism.  Such source routing mechanism can be
>>>>   leveraged to realize the service path layer functionality of the
>>>>   service function chaining (i.e, steering traffic through a particula=
r
>>>>   service function path) by encoding the service function path or the
>>>>   service function chain information as the explicit path information.
>>>>   This document describes how to leverage the MPLS-based source
>> routing
>>>>   mechanism as developed by the SPRING WG to realize the service path
>>>>   layer functionality of the service function chaining.
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>> 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.
>>>>=20
>>>> The IETF Secretariat
>>=20
>> _______________________________________________
>> sfc mailing list
>> sfc@ietf.org
>> https://www.ietf.org/mailman/listinfo/sfc


From nobody Thu Mar  5 07:11:02 2015
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>, Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Subject: Re: [spring] [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Hi Xiaohu,

Thomas and I read your latest draft and believe that you will need to take
it to the MPLS WG as a first step. There are a number of things within the
document that may require changes to the base MPLS architecture and the
SFC WG is not the right community to address those. Given this we will not
be able to consider this document in the SFC WG without agreement from the
broader MPLS community.

Regards,

Jim & Thomas


On 3/4/15, 9:20 PM, "Ron Parker" <Ron_Parker@affirmednetworks.com> wrote:

>I think it needs to be there between SFF's, too.  In the case where there
>is no metadata, you could argue that the data in NSH and the label stack
>are redundantly saying the same thing, but an optimization along these
>lines would not be justified, IMO.
>
>   Ron
>
>
>> On Mar 4, 2015, at 8:58 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
>>=20
>> Hi Ron,
>>=20
>> Thanks a lot for your insightful comments and suggestions. By the way,
>>in the case where there is no need to deliver metadata, does it mean the
>>NSH just only needs to be contained the packets exchanged between SFFs
>>and SFs? In other words, the NSH is used as a way for the SFF to
>>retrieve the label stack which has been stripped by that SFF before.
>>=20
>> Best regards,
>> Xiaohu=20
>>=20
>>> -----Original Message-----
>>> From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
>>> Sent: Thursday, March 05, 2015 12:41 AM
>>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
>>> Subject: RE: [sfc] New Version Notification for
>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>=20
>>> Xiaohu,
>>>=20
>>> I read your latest draft and I do see the elegance of describing a
>>>sequence of
>>> must-visit nodes as a stack of MPLS labels.   And I see that you've
>>>addressed
>>> the transport-independence requirement by stating that the MPLS frames
>>>could
>>> be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I have
>>>a couple of
>>> issues that I suggest be addressed.
>>>=20
>>> First, the text is written as if the NSH header is optional and
>>>present only if
>>> metadata is required.    The SFC architecture is such that the NSH is
>>> mandatory.   I think this issue can be combined with the second issue
>>>that I'll
>>> raise below.
>>>=20
>>> Second, the notion is that the SFF's strip the label stack and then
>>>restore the
>>> label stack.    And since the text states that even when NSH is
>>>present, the SFP
>>> ID is not used, the only remaining basis to do this is flow learning
>>>in the SFF.
>>> While I think there are many reasons that may cause SFF's to utilize
>>>flow
>>> learning advantageously, it should not be a fundamental necessity to
>>>realize an
>>> SFF, IMO.   But even if the SFF is a flow learner, this is still
>>>inadequate since the
>>> SF may change the 5-tuple (e.g., NAT) or may launch internally
>>>generated flows
>>> (e.g., HTTP proxy).   Both cases could not be satisfied by flow
>>>learning.
>>>=20
>>> What I suggest, instead, is a tighter coupling between the NSH header
>>>and the
>>> MPLS label stack.   That there be a 1:1 equivalency between {SFP ID,
>>>SFP hop
>>> index} and the label stack.   Thus, when the SFC-aware SF returns a
>>>packet to
>>> the SFF, the {SFP ID, SFP hop index} contained in the NSH be used to
>>>push the
>>> appropriate label stack onto the packet.    I believe this would bring
>>>the
>>> approach into conformance with the SFC architectural requirements
>>> (mandatory NSH, transport independence) and would solve the problems
>>>with
>>> flow learning identified above.
>>>=20
>>>   Ron
>>>=20
>>>=20
>>>=20
>>> -----Original Message-----
>>> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
>>> Sent: Tuesday, March 3, 2015 11:10 PM
>>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
>>> Subject: Re: [sfc] New Version Notification for
>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>=20
>>> The rationales for leveraging the MPLS-SPRING mechanism to realize the
>>>service
>>> path layer functionality of the service function chaining are as
>>>follows:
>>>=20
>>> 1) eliminate the SFC/SFP states on SFFs. This follows the same logic as
>>> MPLS-SPRING and BIER.
>>> 2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a
>>>maximum
>>> extent. This follows the Transport Derived SFF concept as described in
>>>Section
>>> 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned with
>>>the current
>>> SFC charter, e.g., "...The working group will consider using an
>>>existing
>>> encapsulation (with extensions as appropriate) if a suitable candidate
>>>is found..."
>>> 3) seamlessly support the SFC in a multi-tenant environment (e.g.,
>>>MPLS VPN).
>>> For example, the MPLS VPN packet (containing metadata) could be further
>>> imposed with a label stack which indicates an SFC or SFP associated
>>>with that
>>> packet. SFFs receiving the above packet would strip the whole label
>>>stack and
>>> then send the payload of the MPLS packet (with metadata) to the
>>>corresponding
>>> SFs which are tenant-aware and therefore easily could determine the
>>>tenant
>>> profile according to the tenant info contained in the metadata
>>>(a.k.a., the NSH).
>>>=20
>>> Best regards,
>>> Xiaohu
>>>=20
>>>=20
>>>> -----Original Message-----
>>>> From: Xuxiaohu
>>>> Sent: Wednesday, March 04, 2015 11:31 AM
>>>> To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
>>>> Subject: FW: New Version Notification for
>>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>>=20
>>>> Hi all,
>>>>=20
>>>> This document describes how to leverage the MPLS-based source routing
>>>> (i.e.,
>>>> MPLS-SPRING) mechanism as developed by the SPRING WG to realize the
>>>> service path layer functionality of the service function chaining. In
>>>> addition, this document also describes how to carry metadata in an
>>>> MPLS packet by using the NSH as a metadata container.
>>>>=20
>>>> Any comments are suggestions are welcome.
>>>>=20
>>>> Best regards,
>>>> Xiaohu
>>>>=20
>>>>> -----Original Message-----
>>>>> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
>>>>> Sent: Wednesday, March 04, 2015 11:24 AM
>>>>> To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;
>>>>> Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
>>>>> Subject: New Version Notification for
>>>>> draft-xu-sfc-using-mpls-spring-02.txt
>>>>>=20
>>>>>=20
>>>>> A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
>>>>> has been successfully submitted by Xiaohu Xu and posted to the IETF
>>>> repository.
>>>>>=20
>>>>> Name:        draft-xu-sfc-using-mpls-spring
>>>>> Revision:    02
>>>>> Title:        Service Function Chaining Using MPLS-SPRING
>>>>> Document date:    2015-03-03
>>>>> Group:        Individual Submission
>>>>> Pages:        8
>>>>> URL:
>>>>>=20
>>>>>http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring-02.
>>>>> txt
>>>>> Status:
>>>>> https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
>>>>> Htmlized:
>>> http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-02
>>>>> Diff:
>>>>> http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring-02
>>>>>=20
>>>>> Abstract:
>>>>>   Source Packet Routing in Networking (SPRING) WG specifies a special
>>>>>   source routing mechanism.  Such source routing mechanism can be
>>>>>   leveraged to realize the service path layer functionality of the
>>>>>   service function chaining (i.e, steering traffic through a
>>>>>particular
>>>>>   service function path) by encoding the service function path or the
>>>>>   service function chain information as the explicit path
>>>>>information.
>>>>>   This document describes how to leverage the MPLS-based source
>>> routing
>>>>>   mechanism as developed by the SPRING WG to realize the service path
>>>>>   layer functionality of the service function chaining.
>>>>>=20
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> 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.
>>>>>=20
>>>>> The IETF Secretariat
>>>=20
>>> _______________________________________________
>>> sfc mailing list
>>> sfc@ietf.org
>>> https://www.ietf.org/mailman/listinfo/sfc
>
>_______________________________________________
>sfc mailing list
>sfc@ietf.org
>https://www.ietf.org/mailman/listinfo/sfc


From nobody Thu Mar  5 07:50:55 2015
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To: "spring@ietf.org" <spring@ietf.org>
Thread-Topic: New Version Notification for draft-litkowski-spring-sr-yang-00.txt
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Subject: [spring] FW: New Version Notification for draft-litkowski-spring-sr-yang-00.txt
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From nobody Thu Mar  5 10:30:10 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
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From nobody Thu Mar  5 16:49:05 2015
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Hi Jim,

Understood.

Best regards,
Xiaohu

> -----Original Message-----
> From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
> Sent: Thursday, March 05, 2015 11:11 PM
> To: Ron Parker; Xuxiaohu
> Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
> Subject: Re: [sfc] New Version Notification for
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Hi Xiaohu,
>=20
> Thomas and I read your latest draft and believe that you will need to tak=
e it to
> the MPLS WG as a first step. There are a number of things within the docu=
ment
> that may require changes to the base MPLS architecture and the SFC WG is =
not
> the right community to address those. Given this we will not be able to c=
onsider
> this document in the SFC WG without agreement from the broader MPLS
> community.
>=20
> Regards,
>=20
> Jim & Thomas
>=20
>=20
> On 3/4/15, 9:20 PM, "Ron Parker" <Ron_Parker@affirmednetworks.com>
> wrote:
>=20
> >I think it needs to be there between SFF's, too.  In the case where
> >there is no metadata, you could argue that the data in NSH and the
> >label stack are redundantly saying the same thing, but an optimization
> >along these lines would not be justified, IMO.
> >
> >   Ron
> >
> >
> >> On Mar 4, 2015, at 8:58 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
> >>
> >> Hi Ron,
> >>
> >> Thanks a lot for your insightful comments and suggestions. By the
> >>way, in the case where there is no need to deliver metadata, does it
> >>mean the NSH just only needs to be contained the packets exchanged
> >>between SFFs and SFs? In other words, the NSH is used as a way for the
> >>SFF to retrieve the label stack which has been stripped by that SFF bef=
ore.
> >>
> >> Best regards,
> >> Xiaohu
> >>
> >>> -----Original Message-----
> >>> From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
> >>> Sent: Thursday, March 05, 2015 12:41 AM
> >>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> >>> Subject: RE: [sfc] New Version Notification for
> >>> draft-xu-sfc-using-mpls-spring-02.txt
> >>>
> >>> Xiaohu,
> >>>
> >>> I read your latest draft and I do see the elegance of describing a
> >>>sequence of
> >>> must-visit nodes as a stack of MPLS labels.   And I see that you've
> >>>addressed
> >>> the transport-independence requirement by stating that the MPLS
> >>>frames could
> >>> be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I hav=
e
> >>>a couple of
> >>> issues that I suggest be addressed.
> >>>
> >>> First, the text is written as if the NSH header is optional and
> >>>present only if
> >>> metadata is required.    The SFC architecture is such that the NSH is
> >>> mandatory.   I think this issue can be combined with the second issue
> >>>that I'll
> >>> raise below.
> >>>
> >>> Second, the notion is that the SFF's strip the label stack and then
> >>>restore the
> >>> label stack.    And since the text states that even when NSH is
> >>>present, the SFP
> >>> ID is not used, the only remaining basis to do this is flow learning
> >>>in the SFF.
> >>> While I think there are many reasons that may cause SFF's to utilize
> >>>flow  learning advantageously, it should not be a fundamental
> >>>necessity to realize an
> >>> SFF, IMO.   But even if the SFF is a flow learner, this is still
> >>>inadequate since the
> >>> SF may change the 5-tuple (e.g., NAT) or may launch internally
> >>>generated flows
> >>> (e.g., HTTP proxy).   Both cases could not be satisfied by flow
> >>>learning.
> >>>
> >>> What I suggest, instead, is a tighter coupling between the NSH
> >>>header and the
> >>> MPLS label stack.   That there be a 1:1 equivalency between {SFP ID,
> >>>SFP hop
> >>> index} and the label stack.   Thus, when the SFC-aware SF returns a
> >>>packet to
> >>> the SFF, the {SFP ID, SFP hop index} contained in the NSH be used to
> >>>push the
> >>> appropriate label stack onto the packet.    I believe this would brin=
g
> >>>the
> >>> approach into conformance with the SFC architectural requirements
> >>>(mandatory NSH, transport independence) and would solve the problems
> >>>with  flow learning identified above.
> >>>
> >>>   Ron
> >>>
> >>>
> >>>
> >>> -----Original Message-----
> >>> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
> >>> Sent: Tuesday, March 3, 2015 11:10 PM
> >>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> >>> Subject: Re: [sfc] New Version Notification for
> >>> draft-xu-sfc-using-mpls-spring-02.txt
> >>>
> >>> The rationales for leveraging the MPLS-SPRING mechanism to realize
> >>>the service  path layer functionality of the service function
> >>>chaining are as
> >>>follows:
> >>>
> >>> 1) eliminate the SFC/SFP states on SFFs. This follows the same logic
> >>>as  MPLS-SPRING and BIER.
> >>> 2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a
> >>>maximum  extent. This follows the Transport Derived SFF concept as
> >>>described in Section
> >>> 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned
> >>>with the current  SFC charter, e.g., "...The working group will
> >>>consider using an existing  encapsulation (with extensions as
> >>>appropriate) if a suitable candidate is found..."
> >>> 3) seamlessly support the SFC in a multi-tenant environment (e.g.,
> >>>MPLS VPN).
> >>> For example, the MPLS VPN packet (containing metadata) could be
> >>>further  imposed with a label stack which indicates an SFC or SFP
> >>>associated with that  packet. SFFs receiving the above packet would
> >>>strip the whole label stack and  then send the payload of the MPLS
> >>>packet (with metadata) to the corresponding  SFs which are
> >>>tenant-aware and therefore easily could determine the tenant  profile
> >>>according to the tenant info contained in the metadata (a.k.a., the
> >>>NSH).
> >>>
> >>> Best regards,
> >>> Xiaohu
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Xuxiaohu
> >>>> Sent: Wednesday, March 04, 2015 11:31 AM
> >>>> To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
> >>>> Subject: FW: New Version Notification for
> >>>> draft-xu-sfc-using-mpls-spring-02.txt
> >>>>
> >>>> Hi all,
> >>>>
> >>>> This document describes how to leverage the MPLS-based source
> >>>> routing (i.e.,
> >>>> MPLS-SPRING) mechanism as developed by the SPRING WG to realize the
> >>>> service path layer functionality of the service function chaining.
> >>>> In addition, this document also describes how to carry metadata in
> >>>> an MPLS packet by using the NSH as a metadata container.
> >>>>
> >>>> Any comments are suggestions are welcome.
> >>>>
> >>>> Best regards,
> >>>> Xiaohu
> >>>>
> >>>>> -----Original Message-----
> >>>>> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> >>>>> Sent: Wednesday, March 04, 2015 11:24 AM
> >>>>> To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;
> >>>>> Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
> >>>>> Subject: New Version Notification for
> >>>>> draft-xu-sfc-using-mpls-spring-02.txt
> >>>>>
> >>>>>
> >>>>> A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
> >>>>> has been successfully submitted by Xiaohu Xu and posted to the
> >>>>> IETF
> >>>> repository.
> >>>>>
> >>>>> Name:        draft-xu-sfc-using-mpls-spring
> >>>>> Revision:    02
> >>>>> Title:        Service Function Chaining Using MPLS-SPRING
> >>>>> Document date:    2015-03-03
> >>>>> Group:        Individual Submission
> >>>>> Pages:        8
> >>>>> URL:
> >>>>>
> >>>>>http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring-0=
2.
> >>>>> txt
> >>>>> Status:
> >>>>> https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
> >>>>> Htmlized:
> >>> http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-02
> >>>>> Diff:
> >>>>> http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring-0=
2
> >>>>>
> >>>>> Abstract:
> >>>>>   Source Packet Routing in Networking (SPRING) WG specifies a speci=
al
> >>>>>   source routing mechanism.  Such source routing mechanism can be
> >>>>>   leveraged to realize the service path layer functionality of the
> >>>>>   service function chaining (i.e, steering traffic through a
> >>>>>particular
> >>>>>   service function path) by encoding the service function path or t=
he
> >>>>>   service function chain information as the explicit path
> >>>>>information.
> >>>>>   This document describes how to leverage the MPLS-based source
> >>> routing
> >>>>>   mechanism as developed by the SPRING WG to realize the service
> path
> >>>>>   layer functionality of the service function chaining.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> 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.
> >>>>>
> >>>>> The IETF Secretariat
> >>>
> >>> _______________________________________________
> >>> sfc mailing list
> >>> sfc@ietf.org
> >>> https://www.ietf.org/mailman/listinfo/sfc
> >
> >_______________________________________________
> >sfc mailing list
> >sfc@ietf.org
> >https://www.ietf.org/mailman/listinfo/sfc


From nobody Fri Mar  6 01:26:50 2015
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Subject: [spring] I-D Action: draft-ietf-spring-ipv6-use-cases-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Source Packet Routing in Networking Working Group of the IETF.

        Title           : IPv6 SPRING Use Cases
        Authors         : John Brzozowski
                          John Leddy
                          Ida Leung
                          Stefano Previdi
                          Mark Townsley
                          Christian Martin
                          Clarence Filsfils
                          Roberta Maglione
	Filename        : draft-ietf-spring-ipv6-use-cases-04.txt
	Pages           : 13
	Date            : 2015-03-06

Abstract:
   Source Packet Routing in Networking (SPRING) architecture leverages
   the source routing paradigm.  A node steers a packet through a
   controlled set of instructions, called segments, by prepending the
   packet with SPRING header.  A segment can represent any instruction,
   topological or service-based.  A segment can have a local semantic to
   the SPRING node or global within the SPRING domain.  SPRING allows to
   enforce a flow through any topological path and service chain while
   maintaining per-flow state only at the ingress node to the SPRING
   domain.

   The objective of this document is to illustrate some use cases that
   need to be taken into account by the Source Packet Routing in
   Networking (SPRING) architecture.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-ipv6-use-cases/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-spring-ipv6-use-cases-04

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-spring-ipv6-use-cases-04


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

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


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From: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
To: "Heatley, Nick" <nick.heatley@ee.co.uk>
Thread-Topic: [sfc] [spring] I-D Action: draft-ietf-spring-ipv6-use-cases-04.txt - path-cache-reflector?
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Subject: Re: [spring] [sfc] I-D Action: draft-ietf-spring-ipv6-use-cases-04.txt - path-cache-reflector?
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On Mar 6, 2015, at 11:44 AM, "Heatley, Nick" <nick.heatley@ee.co.uk> wrote:
> Hi authors, this draft is very interesting, thank you.
>=20
> Consider a mobile operator perspective, I was interested in the comment w=
ithin the draft regarding making a source path decision without requiring f=
ull DPI.
> Could there be such a thing as a border "path-cache-reflector" function?
> The egress node, in addition to cleaning up the header, could perform add=
itional functions: The path is dynamically cached for a short while (potent=
ially also NSH), and using a more simple SPI, the return traffic could be r=
eflected down a symmetric path, by reversing the segments?


well, for sure there's nothing that prevents an implementation from doing s=
o. This specific point (reversing the segment list) has ben mentioned alrea=
dy a couple of times.=20

segment routing for v6 dataplane has the nice property of preserving the se=
gment list so it makes you scenario doable.


> For me, the goal would be to use SPI for ingress of return traffic and si=
mpler processes at the border node, rather than resorting to DPI and "full =
service awareness" to classify incoming traffic, when creating a symmetric =
return path. Could this be achieved? This would be an interesting scenario =
or use case; as far as I can tell it is not strictly available in an MPLS e=
nvironment.


it is possible but it would require some state to be kept if the node rever=
sing the segment list is not the destination of the packet. IOW if the reve=
rsing has to happen outside the service/application context.=20


> Perhaps this has already been discussed in say SFC, I don't know. Perhaps=
 there are issues here?
> I am only just discovering these drafts, so please be gentle.


too late... you're in the dark side now... ;-)

s.


> Regards,
> Nick=20
>=20
>=20
> -----Original Message-----
> From: spring [mailto:spring-bounces@ietf.org] On Behalf Of internet-draft=
s@ietf.org
> Sent: 06 March 2015 09:27
> To: i-d-announce@ietf.org
> Cc: spring@ietf.org
> Subject: [spring] I-D Action: draft-ietf-spring-ipv6-use-cases-04.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Source Packet Routing in Networking Work=
ing Group of the IETF.
>=20
>        Title           : IPv6 SPRING Use Cases
>        Authors         : John Brzozowski
>                          John Leddy
>                          Ida Leung
>                          Stefano Previdi
>                          Mark Townsley
>                          Christian Martin
>                          Clarence Filsfils
>                          Roberta Maglione
> 	Filename        : draft-ietf-spring-ipv6-use-cases-04.txt
> 	Pages           : 13
> 	Date            : 2015-03-06
>=20
> Abstract:
>   Source Packet Routing in Networking (SPRING) architecture leverages
>   the source routing paradigm.  A node steers a packet through a
>   controlled set of instructions, called segments, by prepending the
>   packet with SPRING header.  A segment can represent any instruction,
>   topological or service-based.  A segment can have a local semantic to
>   the SPRING node or global within the SPRING domain.  SPRING allows to
>   enforce a flow through any topological path and service chain while
>   maintaining per-flow state only at the ingress node to the SPRING
>   domain.
>=20
>   The objective of this document is to illustrate some use cases that
>   need to be taken into account by the Source Packet Routing in
>   Networking (SPRING) architecture.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-spring-ipv6-use-cases/
>=20
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-ietf-spring-ipv6-use-cases-04
>=20
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-spring-ipv6-use-cases-04
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
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From nobody Sun Mar  8 20:03:25 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>, Ron Parker <Ron_Parker@affirmednetworks.com>
Thread-Topic: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Subject: Re: [spring] [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Hi Jim,

I have remove those options which may cause changes to the MPLS architectur=
e in the latest version (http://tools.ietf.org/html/draft-xu-sfc-using-mpls=
-spring-03).=20

Best regards,
Xiaohu

> -----Original Message-----
> From: Xuxiaohu
> Sent: Friday, March 06, 2015 8:49 AM
> To: 'Jim Guichard (jguichar)'; Ron Parker
> Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
> Subject: RE: [sfc] New Version Notification for
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Hi Jim,
>=20
> Understood.
>=20
> Best regards,
> Xiaohu
>=20
> > -----Original Message-----
> > From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
> > Sent: Thursday, March 05, 2015 11:11 PM
> > To: Ron Parker; Xuxiaohu
> > Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
> > Subject: Re: [sfc] New Version Notification for
> > draft-xu-sfc-using-mpls-spring-02.txt
> >
> > Hi Xiaohu,
> >
> > Thomas and I read your latest draft and believe that you will need to
> > take it to the MPLS WG as a first step. There are a number of things
> > within the document that may require changes to the base MPLS
> > architecture and the SFC WG is not the right community to address
> > those. Given this we will not be able to consider this document in the
> > SFC WG without agreement from the broader MPLS community.
> >
> > Regards,
> >
> > Jim & Thomas
> >
> >
> > On 3/4/15, 9:20 PM, "Ron Parker" <Ron_Parker@affirmednetworks.com>
> > wrote:
> >
> > >I think it needs to be there between SFF's, too.  In the case where
> > >there is no metadata, you could argue that the data in NSH and the
> > >label stack are redundantly saying the same thing, but an
> > >optimization along these lines would not be justified, IMO.
> > >
> > >   Ron
> > >
> > >
> > >> On Mar 4, 2015, at 8:58 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
> > >>
> > >> Hi Ron,
> > >>
> > >> Thanks a lot for your insightful comments and suggestions. By the
> > >>way, in the case where there is no need to deliver metadata, does it
> > >>mean the NSH just only needs to be contained the packets exchanged
> > >>between SFFs and SFs? In other words, the NSH is used as a way for
> > >>the SFF to retrieve the label stack which has been stripped by that S=
FF
> before.
> > >>
> > >> Best regards,
> > >> Xiaohu
> > >>
> > >>> -----Original Message-----
> > >>> From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
> > >>> Sent: Thursday, March 05, 2015 12:41 AM
> > >>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> > >>> Subject: RE: [sfc] New Version Notification for
> > >>> draft-xu-sfc-using-mpls-spring-02.txt
> > >>>
> > >>> Xiaohu,
> > >>>
> > >>> I read your latest draft and I do see the elegance of describing a
> > >>>sequence of
> > >>> must-visit nodes as a stack of MPLS labels.   And I see that you've
> > >>>addressed
> > >>> the transport-independence requirement by stating that the MPLS
> > >>>frames could
> > >>> be carried within IP tunnels (i.e., MPLS in UDP, etc.).    But, I h=
ave
> > >>>a couple of
> > >>> issues that I suggest be addressed.
> > >>>
> > >>> First, the text is written as if the NSH header is optional and
> > >>>present only if
> > >>> metadata is required.    The SFC architecture is such that the NSH =
is
> > >>> mandatory.   I think this issue can be combined with the second iss=
ue
> > >>>that I'll
> > >>> raise below.
> > >>>
> > >>> Second, the notion is that the SFF's strip the label stack and
> > >>>then restore the
> > >>> label stack.    And since the text states that even when NSH is
> > >>>present, the SFP
> > >>> ID is not used, the only remaining basis to do this is flow
> > >>>learning in the SFF.
> > >>> While I think there are many reasons that may cause SFF's to
> > >>>utilize flow  learning advantageously, it should not be a
> > >>>fundamental necessity to realize an
> > >>> SFF, IMO.   But even if the SFF is a flow learner, this is still
> > >>>inadequate since the
> > >>> SF may change the 5-tuple (e.g., NAT) or may launch internally
> > >>>generated flows
> > >>> (e.g., HTTP proxy).   Both cases could not be satisfied by flow
> > >>>learning.
> > >>>
> > >>> What I suggest, instead, is a tighter coupling between the NSH
> > >>>header and the
> > >>> MPLS label stack.   That there be a 1:1 equivalency between {SFP ID=
,
> > >>>SFP hop
> > >>> index} and the label stack.   Thus, when the SFC-aware SF returns a
> > >>>packet to
> > >>> the SFF, the {SFP ID, SFP hop index} contained in the NSH be used
> > >>>to push the
> > >>> appropriate label stack onto the packet.    I believe this would br=
ing
> > >>>the
> > >>> approach into conformance with the SFC architectural requirements
> > >>>(mandatory NSH, transport independence) and would solve the
> > >>>problems with  flow learning identified above.
> > >>>
> > >>>   Ron
> > >>>
> > >>>
> > >>>
> > >>> -----Original Message-----
> > >>> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
> > >>> Sent: Tuesday, March 3, 2015 11:10 PM
> > >>> To: Xuxiaohu; sfc@ietf.org; <spring@ietf.org>; mpls@ietf.org
> > >>> Subject: Re: [sfc] New Version Notification for
> > >>> draft-xu-sfc-using-mpls-spring-02.txt
> > >>>
> > >>> The rationales for leveraging the MPLS-SPRING mechanism to realize
> > >>>the service  path layer functionality of the service function
> > >>>chaining are as
> > >>>follows:
> > >>>
> > >>> 1) eliminate the SFC/SFP states on SFFs. This follows the same
> > >>>logic as  MPLS-SPRING and BIER.
> > >>> 2) utilize the existing encapsulation (e.g., the MPLS-SPRING) to a
> > >>>maximum  extent. This follows the Transport Derived SFF concept as
> > >>>described in Section
> > >>> 4.3.1 of draft-ietf-sfc-architecture. Meanwhile, this is aligned
> > >>>with the current  SFC charter, e.g., "...The working group will
> > >>>consider using an existing  encapsulation (with extensions as
> > >>>appropriate) if a suitable candidate is found..."
> > >>> 3) seamlessly support the SFC in a multi-tenant environment (e.g.,
> > >>>MPLS VPN).
> > >>> For example, the MPLS VPN packet (containing metadata) could be
> > >>>further  imposed with a label stack which indicates an SFC or SFP
> > >>>associated with that  packet. SFFs receiving the above packet would
> > >>>strip the whole label stack and  then send the payload of the MPLS
> > >>>packet (with metadata) to the corresponding  SFs which are
> > >>>tenant-aware and therefore easily could determine the tenant
> > >>>profile according to the tenant info contained in the metadata
> > >>>(a.k.a., the NSH).
> > >>>
> > >>> Best regards,
> > >>> Xiaohu
> > >>>
> > >>>
> > >>>> -----Original Message-----
> > >>>> From: Xuxiaohu
> > >>>> Sent: Wednesday, March 04, 2015 11:31 AM
> > >>>> To: sfc@ietf.org; '<spring@ietf.org>'; mpls@ietf.org
> > >>>> Subject: FW: New Version Notification for
> > >>>> draft-xu-sfc-using-mpls-spring-02.txt
> > >>>>
> > >>>> Hi all,
> > >>>>
> > >>>> This document describes how to leverage the MPLS-based source
> > >>>> routing (i.e.,
> > >>>> MPLS-SPRING) mechanism as developed by the SPRING WG to realize
> > >>>> the service path layer functionality of the service function chain=
ing.
> > >>>> In addition, this document also describes how to carry metadata
> > >>>> in an MPLS packet by using the NSH as a metadata container.
> > >>>>
> > >>>> Any comments are suggestions are welcome.
> > >>>>
> > >>>> Best regards,
> > >>>> Xiaohu
> > >>>>
> > >>>>> -----Original Message-----
> > >>>>> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > >>>>> Sent: Wednesday, March 04, 2015 11:24 AM
> > >>>>> To: Lizhenbin; Luis M. Contreras; Xuxiaohu; Himanshu C. Shah;
> > >>>>> Xuxiaohu; Himanshu Shah; Luis M. Contreras; Lizhenbin
> > >>>>> Subject: New Version Notification for
> > >>>>> draft-xu-sfc-using-mpls-spring-02.txt
> > >>>>>
> > >>>>>
> > >>>>> A new version of I-D, draft-xu-sfc-using-mpls-spring-02.txt
> > >>>>> has been successfully submitted by Xiaohu Xu and posted to the
> > >>>>> IETF
> > >>>> repository.
> > >>>>>
> > >>>>> Name:        draft-xu-sfc-using-mpls-spring
> > >>>>> Revision:    02
> > >>>>> Title:        Service Function Chaining Using MPLS-SPRING
> > >>>>> Document date:    2015-03-03
> > >>>>> Group:        Individual Submission
> > >>>>> Pages:        8
> > >>>>> URL:
> > >>>>>
> > >>>>>http://www.ietf.org/internet-drafts/draft-xu-sfc-using-mpls-spring=
-02.
> > >>>>> txt
> > >>>>> Status:
> > >>>>> https://datatracker.ietf.org/doc/draft-xu-sfc-using-mpls-spring/
> > >>>>> Htmlized:
> > >>> http://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-02
> > >>>>> Diff:
> > >>>>> http://www.ietf.org/rfcdiff?url2=3Ddraft-xu-sfc-using-mpls-spring=
-
> > >>>>> 02
> > >>>>>
> > >>>>> Abstract:
> > >>>>>   Source Packet Routing in Networking (SPRING) WG specifies a
> special
> > >>>>>   source routing mechanism.  Such source routing mechanism can be
> > >>>>>   leveraged to realize the service path layer functionality of th=
e
> > >>>>>   service function chaining (i.e, steering traffic through a
> > >>>>>particular
> > >>>>>   service function path) by encoding the service function path or=
 the
> > >>>>>   service function chain information as the explicit path
> > >>>>>information.
> > >>>>>   This document describes how to leverage the MPLS-based source
> > >>> routing
> > >>>>>   mechanism as developed by the SPRING WG to realize the service
> > path
> > >>>>>   layer functionality of the service function chaining.
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> 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.
> > >>>>>
> > >>>>> The IETF Secretariat
> > >>>
> > >>> _______________________________________________
> > >>> sfc mailing list
> > >>> sfc@ietf.org
> > >>> https://www.ietf.org/mailman/listinfo/sfc
> > >
> > >_______________________________________________
> > >sfc mailing list
> > >sfc@ietf.org
> > >https://www.ietf.org/mailman/listinfo/sfc


From nobody Mon Mar  9 16:33:43 2015
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From: "Cankaya, Hakki" <Hakki.Cankaya@us.fujitsu.com>
To: "'John G. Scudder'" <jgs@juniper.net>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] IETF-92 agenda topics
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Subject: Re: [spring] IETF-92 agenda topics
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Hi John and Bruno;

Thanks for arranging the SPRING session for Dallas IETF-92 meeting.
We would like to share the updates and progress on our "SPRING OpenFlow Int=
erworking Requirements" draft during the SPRING session on 3/26.
For this, we would like to have a 5 to 10 min slot in the agenda, if possib=
le.
I will be doing the presentation and will send you the slides.

Pls advise.

Hakki Cankaya



-----Original Message-----
From: John G. Scudder [mailto:jgs@juniper.net]=20
Sent: Sunday, March 01, 2015 7:41 PM
To: spring@ietf.org
Cc: <bruno.decraene@orange.com>
Subject: [spring] IETF-92 agenda topics

Folks,

SPRING will meet at IETF-92 on Thursday, March 26, from 5:40 to 6:40.  Plea=
se forward any SPRING agenda items you might have to Bruno and me.  The dea=
dline is March 9 (a week from Monday) by 10:00 U.S. Eastern Time.  Priority=
 will be given to those who get their requests in by the deadline, though i=
f agenda space permits it we will consider requests gotten in before March =
16 at 10:00 U.S. Eastern Time.

We have a short meeting slot this time, so it is quite possible we may not =
be able to accommodate all requests. I apologize in advance if your request=
 has to be declined. We'll give preference to work that directly advances t=
he WG charter, especially charter items at risk of slipping, and to work th=
at requires interactive discussion rather than status reports or presentati=
ons of results. Please keep in mind that the mailing list is always availab=
le for such reports and we encourage you to use it.

If you have previously presented on your topic at a SPRING meeting, please =
explain in your request what you hope to achieve with your presentation thi=
s time. If you have requested to present the same work at multiple WGs, ple=
ase note this so that we can coordinate as needed.

You should plan to send your slides to Bruno and me no later than 24 hours =
prior to the meeting, though again, earlier is better. If we don't have you=
r slides by the deadline, you may lose your slot. Please number your slides=
 for the benefit of remote attendees, and if you plan to use any fancy buil=
ds or transitions you must arrange this with us in advance -- otherwise you=
 should assume your slides may be converted to PDF and presented from the P=
DF.

Finally, if you request an agenda slot, please do so by replying to this me=
ssage, making sure to include both Bruno and me in the To: or Cc: and don't=
 change the subject line. Please include the name of the person who will be=
 presenting and give an estimate for how much time you think you'll need (i=
ncluding Q/A).

Thanks,

--John & Bruno


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From nobody Tue Mar 10 04:46:52 2015
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Date: Tue, 10 Mar 2015 12:46:32 +0100
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [spring] Fwd: New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Ting,

there is a concept of SR Mapping Server, which can be used to advertise 
SIDs for prefixes from the central place.

draft-ietf-ospf-segment-routing-extensions defines the OSPF Extended 
Prefix Range TLV in section 4 which is used to advertise the SID 
mappings by SRMS. Similarly ISIS SR drafts defines a similar mechanism 
in ISIS. There are already implementations that support SRMS.

What you defined in your draft looks very similar to SRMS and we 
definitely do not need two different ways to achieve the same goal.

regards,
Peter

On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>
> Hi all,
>
> New version of SID Allocation has been published and description has
> been revised according to comments from the mailing list.
> Comments are welcome and discussions in Dallas are expected.
>
> Best Regards.
> Ting
> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>
> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>
>  >
>  > A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>  > has been successfully submitted by Fangwei Hu and posted to the
>  > IETF repository.
>  >
>  > Name:      draft-lw-spring-sid-allocation
>  > Revision:   01
>  > Title:      SPRING SID Allocation
>  > Document date:   2015-03-08
>  > Group:      Individual Submission
>  > Pages:      12
>  > URL:            http://www.ietf.org/internet-drafts/draft-lw-spring-
>  > sid-allocation-01.txt
>  > Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>  > sid-allocation/
>  > Htmlized:
> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>  > Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>  > sid-allocation-01
>  >
>  > Abstract:
>  >    Segment Routing (SR) allows for a flexible definition of end-to-end
>  >    paths within IGP topologies by encoding paths as sequences of
>  >    topological sub-paths, called "segments".  These segments are
>  >    advertised by the link-state routing protocols (IS-IS and OSPF).  And
>  >    a segment is identified by a Segment Routing ID (SID).  This document
>  >    proposes a method to reduce the SID configuration in a SR domain.
>  >    Only the selected SR nodes which named Segment Routing Management
>  >    Nodes (SRMNs) are configured by NMS, while other SRs in the domain
>  >    need zero-SR-configuration.
>  >
>  >
>  >
>  >
>  > 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.
>  >
>  > The IETF Secretariat
>  >
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
> https://www.ietf.org/mailman/listinfo/spring
>


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From: <rabah.guedrez@orange.com>
To: "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
Thread-Topic: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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On 3/10/15 14:49 , rabah.guedrez@orange.com wrote:
> The mapping server is attended to bind prefixes and SID of  non SPRING nodes, not to configure a SPRING node see https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp-interop-02#section-4.2

SRMS can be used to advertise SIDs for SPRING nodes as well.

Peter


>
> Configuring SPRING nodes can be done manually or via a centralized entity,
> The centralized entity can be an SDN controller or an extended   mapping server, configs can be pushed using OpenFlow or NETCONFIG /YANG see https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>
> In my opinion we should work on the process of configuring SPRING nodes, the architecture(SR-client and SR-controller) and defining the minimum configs for a node to function properly.
>
> Nether the proposed draft nor the section on the mapping server addressed those requirements.
>
> There are two types of configurations that need to be pushed to SPRING nodes  : Required and Optional
> Required configs : are all the information that has global signification like node-SID, anycast-SID,++ ..., or when decided to use the same SRGB on all the SPRING nodes, those config must be done manually or pushed from centralized entity.
> Optional configs : all the decision that can be made locally by the "SR-client"  like assigning Adj-SIDs to the node interfaces.
>
>
> -----Message d'origine-----
> De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano Previdi (sprevidi)
> Envoyé : mardi 10 mars 2015 13:07
> À : Peter Psenak (ppsenak)
> Cc : spring@ietf.org; <liao.ting@zte.com.cn>
> Objet : Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
>
> I agree. We already have interop tests done on the SRMS so what is the real added value of another proposal ?
>
> s.
>
>
> On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com> wrote:
>
>> Ting,
>>
>> there is a concept of SR Mapping Server, which can be used to advertise SIDs for prefixes from the central place.
>>
>> draft-ietf-ospf-segment-routing-extensions defines the OSPF Extended Prefix Range TLV in section 4 which is used to advertise the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar mechanism in ISIS. There are already implementations that support SRMS.
>>
>> What you defined in your draft looks very similar to SRMS and we definitely do not need two different ways to achieve the same goal.
>>
>> regards,
>> Peter
>>
>> On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>>>
>>> Hi all,
>>>
>>> New version of SID Allocation has been published and description has
>>> been revised according to comments from the mailing list.
>>> Comments are welcome and discussions in Dallas are expected.
>>>
>>> Best Regards.
>>> Ting
>>> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>>>
>>> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>>>
>>>>
>>>> A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>>>> has been successfully submitted by Fangwei Hu and posted to the
>>>> IETF repository.
>>>>
>>>> Name:      draft-lw-spring-sid-allocation
>>>> Revision:   01
>>>> Title:      SPRING SID Allocation
>>>> Document date:   2015-03-08
>>>> Group:      Individual Submission
>>>> Pages:      12
>>>> URL:            http://www.ietf.org/internet-drafts/draft-lw-spring-
>>>> sid-allocation-01.txt
>>>> Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>>>> sid-allocation/
>>>> Htmlized:
>>> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>>>> Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>>>> sid-allocation-01
>>>>
>>>> Abstract:
>>>>     Segment Routing (SR) allows for a flexible definition of end-to-end
>>>>     paths within IGP topologies by encoding paths as sequences of
>>>>     topological sub-paths, called "segments".  These segments are
>>>>     advertised by the link-state routing protocols (IS-IS and OSPF).  And
>>>>     a segment is identified by a Segment Routing ID (SID).  This document
>>>>     proposes a method to reduce the SID configuration in a SR domain.
>>>>     Only the selected SR nodes which named Segment Routing Management
>>>>     Nodes (SRMNs) are configured by NMS, while other SRs in the domain
>>>>     need zero-SR-configuration.
>>>>
>>>>
>>>>
>>>>
>>>> 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.
>>>>
>>>> The IETF Secretariat
>>>>
>>>
>>>
>>> _______________________________________________
>>> spring mailing list
>>> spring@ietf.org
>>> https://www.ietf.org/mailman/listinfo/spring
>>>
>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org
>> https://www.ietf.org/mailman/listinfo/spring
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Thread-Topic: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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To: rabah.guedrez@orange.com, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
References: <201503101039.t2AAd84j059340@mse02.zte.com.cn> <54FED998.8080702@cisco.com> <F82E7318-3EC0-4F45-8CC0-8894EB7646CE@cisco.com> <4714_1425995391_54FEF67F_4714_602_1_27B26A2868951342946169C453A0DF4B220EA414@OPEXCLILM43.corporate.adroot.infra.ftgroup> <54FEF86E.1050301@cisco.com> <B594E902-9C4E-43EE-843F-0C33AA6F0E6C@cisco.com> <19380_1425997346_54FEFE22_19380_89_2_27B26A2868951342946169C453A0DF4B220EA43F@OPEXCLILM43.corporate.adroot.infra.ftgroup>
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Cc: "spring@ietf.org" <spring@ietf.org>, "liao.ting@zte.com.cn" <liao.ting@zte.com.cn>
Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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On 3/10/15 15:22 , rabah.guedrez@orange.com wrote:
>> SRMS can be used to advertise SIDs for SPRING nodes as well.
>
> Can you clarify some points for me, does your  mapping server push configuration to the SPRING node or Advertise the node-SID, ADj-SID, SID-RANGE and so on. using the IGP on the behalf of the SPRING node.

SRMS advertises mappings between prefixes and SIDs. Prefixes can be 
located in SPRING domain or outside.

Peter


> Rabah.
>
> -----Message d'origine-----
> De : Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com]
> Envoyé : mardi 10 mars 2015 15:15
> À : Peter Psenak (ppsenak)
> Cc : GUEDREZ Rabah IMT/OLN; spring@ietf.org; liao.ting@zte.com.cn
> Objet : Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
>
>
> On Mar 10, 2015, at 2:58 PM, Peter Psenak <ppsenak@cisco.com>
>   wrote:
>
>> On 3/10/15 14:49 , rabah.guedrez@orange.com wrote:
>>> The mapping server is attended to bind prefixes and SID of  non
>>> SPRING nodes, not to configure a SPRING node see
>>> https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ldp
>>> -interop-02#section-4.2
>>
>> SRMS can be used to advertise SIDs for SPRING nodes as well.
>
>
> correct.
> s.
>
>
>>
>> Peter
>>
>>
>>>
>>> Configuring SPRING nodes can be done manually or via a centralized entity,
>>> The centralized entity can be an SDN controller or an extended   mapping server, configs can be pushed using OpenFlow or NETCONFIG /YANG see https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>>>
>>> In my opinion we should work on the process of configuring SPRING nodes, the architecture(SR-client and SR-controller) and defining the minimum configs for a node to function properly.
>>>
>>> Nether the proposed draft nor the section on the mapping server addressed those requirements.
>>>
>>> There are two types of configurations that need to be pushed to
>>> SPRING nodes  : Required and Optional Required configs : are all the information that has global signification like node-SID, anycast-SID,++ ..., or when decided to use the same SRGB on all the SPRING nodes, those config must be done manually or pushed from centralized entity.
>>> Optional configs : all the decision that can be made locally by the "SR-client"  like assigning Adj-SIDs to the node interfaces.
>>>
>>>
>>> -----Message d'origine-----
>>> De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano
>>> Previdi (sprevidi) Envoyé : mardi 10 mars 2015 13:07 À : Peter Psenak
>>> (ppsenak) Cc : spring@ietf.org; <liao.ting@zte.com.cn> Objet : Re:
>>> [spring] New Version Notification for
>>> draft-lw-spring-sid-allocation-01.txt
>>>
>>> I agree. We already have interop tests done on the SRMS so what is the real added value of another proposal ?
>>>
>>> s.
>>>
>>>
>>> On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com> wrote:
>>>
>>>> Ting,
>>>>
>>>> there is a concept of SR Mapping Server, which can be used to advertise SIDs for prefixes from the central place.
>>>>
>>>> draft-ietf-ospf-segment-routing-extensions defines the OSPF Extended Prefix Range TLV in section 4 which is used to advertise the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar mechanism in ISIS. There are already implementations that support SRMS.
>>>>
>>>> What you defined in your draft looks very similar to SRMS and we definitely do not need two different ways to achieve the same goal.
>>>>
>>>> regards,
>>>> Peter
>>>>
>>>> On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>>>>>
>>>>> Hi all,
>>>>>
>>>>> New version of SID Allocation has been published and description
>>>>> has been revised according to comments from the mailing list.
>>>>> Comments are welcome and discussions in Dallas are expected.
>>>>>
>>>>> Best Regards.
>>>>> Ting
>>>>> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>>>>>
>>>>> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>>>>>
>>>>>>
>>>>>> A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>>>>>> has been successfully submitted by Fangwei Hu and posted to the
>>>>>> IETF repository.
>>>>>>
>>>>>> Name:      draft-lw-spring-sid-allocation
>>>>>> Revision:   01
>>>>>> Title:      SPRING SID Allocation
>>>>>> Document date:   2015-03-08
>>>>>> Group:      Individual Submission
>>>>>> Pages:      12
>>>>>> URL:            http://www.ietf.org/internet-drafts/draft-lw-spring-
>>>>>> sid-allocation-01.txt
>>>>>> Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>>>>>> sid-allocation/
>>>>>> Htmlized:
>>>>> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>>>>>> Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>>>>>> sid-allocation-01
>>>>>>
>>>>>> Abstract:
>>>>>>     Segment Routing (SR) allows for a flexible definition of end-to-end
>>>>>>     paths within IGP topologies by encoding paths as sequences of
>>>>>>     topological sub-paths, called "segments".  These segments are
>>>>>>     advertised by the link-state routing protocols (IS-IS and OSPF).  And
>>>>>>     a segment is identified by a Segment Routing ID (SID).  This document
>>>>>>     proposes a method to reduce the SID configuration in a SR domain.
>>>>>>     Only the selected SR nodes which named Segment Routing Management
>>>>>>     Nodes (SRMNs) are configured by NMS, while other SRs in the domain
>>>>>>     need zero-SR-configuration.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 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.
>>>>>>
>>>>>> The IETF Secretariat
>>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> spring mailing list
>>>>> spring@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/spring
>>>>>
>>>>
>>>> _______________________________________________
>>>> spring mailing list
>>>> spring@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/spring
>>>
>>> _______________________________________________
>>> spring mailing list
>>> spring@ietf.org
>>> https://www.ietf.org/mailman/listinfo/spring
>>>
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From: <rabah.guedrez@orange.com>
To: Peter Psenak <ppsenak@cisco.com>, "Stefano Previdi (sprevidi)" <sprevidi@cisco.com>
Thread-Topic: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Date: Tue, 10 Mar 2015 15:07:32 +0000
Message-ID: <16391_1426000053_54FF08B5_16391_3452_1_27B26A2868951342946169C453A0DF4B220EA463@OPEXCLILM43.corporate.adroot.infra.ftgroup>
References: <201503101039.t2AAd84j059340@mse02.zte.com.cn> <54FED998.8080702@cisco.com> <F82E7318-3EC0-4F45-8CC0-8894EB7646CE@cisco.com> <4714_1425995391_54FEF67F_4714_602_1_27B26A2868951342946169C453A0DF4B220EA414@OPEXCLILM43.corporate.adroot.infra.ftgroup> <54FEF86E.1050301@cisco.com> <B594E902-9C4E-43EE-843F-0C33AA6F0E6C@cisco.com> <19380_1425997346_54FEFE22_19380_89_2_27B26A2868951342946169C453A0DF4B220EA43F@OPEXCLILM43.corporate.adroot.infra.ftgroup> <54FF016C.7080002@cisco.com>
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Cc: "spring@ietf.org" <spring@ietf.org>, "liao.ting@zte.com.cn" <liao.ting@zte.com.cn>
Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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On 3/10/15 16:07 , rabah.guedrez@orange.com wrote:
>> SRMS advertises mappings between prefixes and SIDs. Prefixes can be located in SPRING domain or outside.
> If did understand ^-^ then the SRMS implement an instance of IGP (OSPF or ISIS) for every SPRING node it advertise all the SR information, is that correct ?

SRMS uses IGP to advertise mappings between prefixes and SIDs - that's 
all it does.

Peter

>
> -----Message d'origine-----
> De : Peter Psenak [mailto:ppsenak@cisco.com]
> Envoyé : mardi 10 mars 2015 15:36
> À : GUEDREZ Rabah IMT/OLN; Stefano Previdi (sprevidi)
> Cc : spring@ietf.org; liao.ting@zte.com.cn
> Objet : Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
>
> On 3/10/15 15:22 , rabah.guedrez@orange.com wrote:
>>> SRMS can be used to advertise SIDs for SPRING nodes as well.
>>
>> Can you clarify some points for me, does your  mapping server push configuration to the SPRING node or Advertise the node-SID, ADj-SID, SID-RANGE and so on. using the IGP on the behalf of the SPRING node.
>
> SRMS advertises mappings between prefixes and SIDs. Prefixes can be located in SPRING domain or outside.
>
> Peter
>
>
>> Rabah.
>>
>> -----Message d'origine-----
>> De : Stefano Previdi (sprevidi) [mailto:sprevidi@cisco.com] Envoyé :
>> mardi 10 mars 2015 15:15 À : Peter Psenak (ppsenak) Cc : GUEDREZ Rabah
>> IMT/OLN; spring@ietf.org; liao.ting@zte.com.cn Objet : Re: [spring]
>> New Version Notification for draft-lw-spring-sid-allocation-01.txt
>>
>>
>> On Mar 10, 2015, at 2:58 PM, Peter Psenak <ppsenak@cisco.com>
>>    wrote:
>>
>>> On 3/10/15 14:49 , rabah.guedrez@orange.com wrote:
>>>> The mapping server is attended to bind prefixes and SID of  non
>>>> SPRING nodes, not to configure a SPRING node see
>>>> https://tools.ietf.org/html/draft-filsfils-spring-segment-routing-ld
>>>> p
>>>> -interop-02#section-4.2
>>>
>>> SRMS can be used to advertise SIDs for SPRING nodes as well.
>>
>>
>> correct.
>> s.
>>
>>
>>>
>>> Peter
>>>
>>>
>>>>
>>>> Configuring SPRING nodes can be done manually or via a centralized entity,
>>>> The centralized entity can be an SDN controller or an extended   mapping server, configs can be pushed using OpenFlow or NETCONFIG /YANG see https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>>>>
>>>> In my opinion we should work on the process of configuring SPRING nodes, the architecture(SR-client and SR-controller) and defining the minimum configs for a node to function properly.
>>>>
>>>> Nether the proposed draft nor the section on the mapping server addressed those requirements.
>>>>
>>>> There are two types of configurations that need to be pushed to
>>>> SPRING nodes  : Required and Optional Required configs : are all the information that has global signification like node-SID, anycast-SID,++ ..., or when decided to use the same SRGB on all the SPRING nodes, those config must be done manually or pushed from centralized entity.
>>>> Optional configs : all the decision that can be made locally by the "SR-client"  like assigning Adj-SIDs to the node interfaces.
>>>>
>>>>
>>>> -----Message d'origine-----
>>>> De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano
>>>> Previdi (sprevidi) Envoyé : mardi 10 mars 2015 13:07 À : Peter
>>>> Psenak
>>>> (ppsenak) Cc : spring@ietf.org; <liao.ting@zte.com.cn> Objet : Re:
>>>> [spring] New Version Notification for
>>>> draft-lw-spring-sid-allocation-01.txt
>>>>
>>>> I agree. We already have interop tests done on the SRMS so what is the real added value of another proposal ?
>>>>
>>>> s.
>>>>
>>>>
>>>> On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com> wrote:
>>>>
>>>>> Ting,
>>>>>
>>>>> there is a concept of SR Mapping Server, which can be used to advertise SIDs for prefixes from the central place.
>>>>>
>>>>> draft-ietf-ospf-segment-routing-extensions defines the OSPF Extended Prefix Range TLV in section 4 which is used to advertise the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar mechanism in ISIS. There are already implementations that support SRMS.
>>>>>
>>>>> What you defined in your draft looks very similar to SRMS and we definitely do not need two different ways to achieve the same goal.
>>>>>
>>>>> regards,
>>>>> Peter
>>>>>
>>>>> On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> New version of SID Allocation has been published and description
>>>>>> has been revised according to comments from the mailing list.
>>>>>> Comments are welcome and discussions in Dallas are expected.
>>>>>>
>>>>>> Best Regards.
>>>>>> Ting
>>>>>> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>>>>>>
>>>>>> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>>>>>>
>>>>>>>
>>>>>>> A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>>>>>>> has been successfully submitted by Fangwei Hu and posted to the
>>>>>>> IETF repository.
>>>>>>>
>>>>>>> Name:      draft-lw-spring-sid-allocation
>>>>>>> Revision:   01
>>>>>>> Title:      SPRING SID Allocation
>>>>>>> Document date:   2015-03-08
>>>>>>> Group:      Individual Submission
>>>>>>> Pages:      12
>>>>>>> URL:            http://www.ietf.org/internet-drafts/draft-lw-spring-
>>>>>>> sid-allocation-01.txt
>>>>>>> Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>>>>>>> sid-allocation/
>>>>>>> Htmlized:
>>>>>> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>>>>>>> Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>>>>>>> sid-allocation-01
>>>>>>>
>>>>>>> Abstract:
>>>>>>>      Segment Routing (SR) allows for a flexible definition of end-to-end
>>>>>>>      paths within IGP topologies by encoding paths as sequences of
>>>>>>>      topological sub-paths, called "segments".  These segments are
>>>>>>>      advertised by the link-state routing protocols (IS-IS and OSPF).  And
>>>>>>>      a segment is identified by a Segment Routing ID (SID).  This document
>>>>>>>      proposes a method to reduce the SID configuration in a SR domain.
>>>>>>>      Only the selected SR nodes which named Segment Routing Management
>>>>>>>      Nodes (SRMNs) are configured by NMS, while other SRs in the domain
>>>>>>>      need zero-SR-configuration.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 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.
>>>>>>>
>>>>>>> The IETF Secretariat
>>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> spring mailing list
>>>>>> spring@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/spring
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> spring mailing list
>>>>> spring@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/spring
>>>>
>>>> _______________________________________________
>>>> spring mailing list
>>>> spring@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/spring
>>>>
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> _________________________________________________________________________________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and delete this message and its attachments.
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Ting,

On 3/11/15 10:33 , liao.ting@zte.com.cn wrote:
>
> Hi rabah，peter，stefano,
>
> Thanks for your reviews and comments. The SID allocation proposal is
> used to
> solve the automatic SID configuration based on the operator's requirment
> of zero configuration for the nodes.
> It includes the following differences with SRMS：
>
> 1.  It has a mechanism to ensure the uniqueness of SID allocation.
> When two or more SRMNs(SR management nodes described in this draft)
> allocate different SIDs to the same prefix,
> we provide a method for the SR nodes to choose one of the SID in the
> proposal.

above has nothing to do with SRMS or SRMN as such, conflict resolution 
is handled at the receiving routers and is completely orthogonal to the 
way you distribute it.

>
> 2.  The SRMN only allocates SID to SR node in this draft.
> I wonder there may be some problem if SRMS can allocates SID to non-SR
> node and SR node.

there is no problem in allocating SID for non-SR node. There are 
multiple implementations of SRMS that do that and it proved to work fine.

>
> For example, the SRMS is in charge of mapping a SID( SID A) to a non SR
> node（node A）originally,
> and then SRMS floods the mapping message to SR domain, when a SR
> node(node B) receives  the message,
> node B learns an entry of SID A with a nexthop, where  the nexthop is
> the shortest path to SRMS but not to node A.

what is the problem? In SR domain no matter what is the next hop, SID is 
a global index and the value of index is bound to a prefix on all nodes. 
In a non-SR domain, SID is not used at all.

> Of course the SRMS can be used to allocate a SID（SID C）to a SR
> node(node C),
> when SR node B learns  this message , it still learns the nexthop is the
> shortest path to SRMS，
> and in this case，the nexthop should be to node C.
>
> In this proposal, the nexthop is to SR node C.
>
> 3.  In the allocation TLV described in this draft, it can carry other SR
> related configuration such as algorithm, MT number,
> and in a TLV, it can carry one or more ip addresses, no matter the
> addresses are consecutive or inconsecutive.

advertising a capability of a remote node from the SRMN can become 
dangerous, especially if the node is not configured consistently with 
what is advertised from the SRMN.

regards,
Peter

>
> Best Regards.
> Ting
>
> "spring" <spring-bounces@ietf.org> 写于 2015-03-10 21:49:49:
>
>  > The mapping server is attended to bind prefixes and SID of  non
>  > SPRING nodes, not to configure a SPRING node see https://tools.ietf.
>  > org/html/draft-filsfils-spring-segment-routing-ldp-interop-02#section-4.2
>  >
>  > Configuring SPRING nodes can be done manually or via a centralized
> entity,
>  > The centralized entity can be an SDN controller or an extended
>  > mapping server, configs can be pushed using OpenFlow or NETCONFIG
> /YANG see
>  > https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>  >
>  > In my opinion we should work on the process of configuring SPRING
>  > nodes, the architecture(SR-client and SR-controller) and defining
>  > the minimum configs for a node to function properly.
>  >
>  > Nether the proposed draft nor the section on the mapping server
>  > addressed those requirements.
>  >
>  > There are two types of configurations that need to be pushed to
>  > SPRING nodes  : Required and Optional
>  > Required configs : are all the information that has global
>  > signification like node-SID, anycast-SID,++ ..., or when decided to
>  > use the same SRGB on all the SPRING nodes, those config must be done
>  > manually or pushed from centralized entity.
>  > Optional configs : all the decision that can be made locally by the
>  > "SR-client"  like assigning Adj-SIDs to the node interfaces.
>  >
>  >
>  > -----Message d'origine-----
>  > De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano
>  > Previdi (sprevidi)
>  > Envoyé : mardi 10 mars 2015 13:07
>  > À : Peter Psenak (ppsenak)
>  > Cc : spring@ietf.org; <liao.ting@zte.com.cn>
>  > Objet : Re: [spring] New Version Notification for draft-lw-spring-
>  > sid-allocation-01.txt
>  >
>  > I agree. We already have interop tests done on the SRMS so what is
>  > the real added value of another proposal ?
>  >
>  > s.
>  >
>  >
>  > On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com> wrote:
>  >
>  > > Ting,
>  > >
>  > > there is a concept of SR Mapping Server, which can be used to
>  > advertise SIDs for prefixes from the central place.
>  > >
>  > > draft-ietf-ospf-segment-routing-extensions defines the OSPF
>  > Extended Prefix Range TLV in section 4 which is used to advertise
>  > the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar
>  > mechanism in ISIS. There are already implementations that support SRMS.
>  > >
>  > > What you defined in your draft looks very similar to SRMS and we
>  > definitely do not need two different ways to achieve the same goal.
>  > >
>  > > regards,
>  > > Peter
>  > >
>  > > On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>  > >>
>  > >> Hi all,
>  > >>
>  > >> New version of SID Allocation has been published and description has
>  > >> been revised according to comments from the mailing list.
>  > >> Comments are welcome and discussions in Dallas are expected.
>  > >>
>  > >> Best Regards.
>  > >> Ting
>  > >> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>  > >>
>  > >> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>  > >>
>  > >> >
>  > >> > A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>  > >> > has been successfully submitted by Fangwei Hu and posted to the
>  > >> > IETF repository.
>  > >> >
>  > >> > Name:      draft-lw-spring-sid-allocation
>  > >> > Revision:   01
>  > >> > Title:      SPRING SID Allocation
>  > >> > Document date:   2015-03-08
>  > >> > Group:      Individual Submission
>  > >> > Pages:      12
>  > >> > URL:            http://www.ietf.org/internet-drafts/draft-lw-spring-
>  > >> > sid-allocation-01.txt
>  > >> > Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>  > >> > sid-allocation/
>  > >> > Htmlized:
>  > >> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>  > >> > Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>  > >> > sid-allocation-01
>  > >> >
>  > >> > Abstract:
>  > >> >    Segment Routing (SR) allows for a flexible definition of
> end-to-end
>  > >> >    paths within IGP topologies by encoding paths as sequences of
>  > >> >    topological sub-paths, called "segments".  These segments are
>  > >> >    advertised by the link-state routing protocols (IS-IS and
> OSPF).  And
>  > >> >    a segment is identified by a Segment Routing ID (SID).  This
> document
>  > >> >    proposes a method to reduce the SID configuration in a SR domain.
>  > >> >    Only the selected SR nodes which named Segment Routing Management
>  > >> >    Nodes (SRMNs) are configured by NMS, while other SRs in the
> domain
>  > >> >    need zero-SR-configuration.
>  > >> >
>  > >> >
>  > >> >
>  > >> >
>  > >> > 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.
>  > >> >
>  > >> > The IETF Secretariat
>  > >> >
>  > >>
>  > >>
>  > >> _______________________________________________
>  > >> spring mailing list
>  > >> spring@ietf.org
>  > >> https://www.ietf.org/mailman/listinfo/spring
>  > >>
>  > >
>  > > _______________________________________________
>  > > spring mailing list
>  > > spring@ietf.org
>  > > https://www.ietf.org/mailman/listinfo/spring
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X-Mailer: Lotus Notes Release 6.5.6 March 06, 2007
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Date: Thu, 12 Mar 2015 15:02:45 +0800
X-MIMETrack: Serialize by Router on notes_smtp/zte_ltd(Release 8.5.3FP6|November 21, 2013) at 2015-03-12 15:02:52, Serialize complete at 2015-03-12 15:02:52
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Date: Thu, 12 Mar 2015 09:07:22 +0100
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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Ting,

please see inline:

On 3/12/15 08:10 , liao.ting@zte.com.cn wrote:
>
> Hi Peter,
>
> Please see inline [Ting].
>
> Best Regards.
> Ting
>
> "spring" <spring-bounces@ietf.org> 写于 2015-03-11 18:06:31:
>
>  > Ting,
>  >
>  > On 3/11/15 10:33 , liao.ting@zte.com.cn wrote:
>  > >
>  > > Hi rabah，peter，stefano,
>  > >
>  > > Thanks for your reviews and comments. The SID allocation proposal is
>  > > used to
>  > > solve the automatic SID configuration based on the operator's
> requirment
>  > > of zero configuration for the nodes.
>  > > It includes the following differences with SRMS：
>  > >
>  > > 1.  It has a mechanism to ensure the uniqueness of SID allocation.
>  > > When two or more SRMNs(SR management nodes described in this draft)
>  > > allocate different SIDs to the same prefix,
>  > > we provide a method for the SR nodes to choose one of the SID in the
>  > > proposal.
>  >
>  > above has nothing to do with SRMS or SRMN as such, conflict resolution
>  > is handled at the receiving routers and is completely orthogonal to the
>  > way you distribute it.
>
> [Ting] Yes, the receiving router handles the conflict, and the conflict
> resolution
> is based on the extension as described in the SID allocation.
>  > >
>  > > 2.  The SRMN only allocates SID to SR node in this draft.
>  > > I wonder there may be some problem if SRMS can allocates SID to non-SR
>  > > node and SR node.
>  >
>  > there is no problem in allocating SID for non-SR node. There are
>  > multiple implementations of SRMS that do that and it proved to work
> fine.
>
> [Ting] Yes, the SRMS is in charge of allocating sid for non-sr node
> originally.

no, that is not correct. It can allocate SIDs for SR and non-SR nodes.

>  > >
>  > > For example, the SRMS is in charge of mapping a SID( SID A) to a non SR
>  > > node（node A）originally,
>  > > and then SRMS floods the mapping message to SR domain, when a SR
>  > > node(node B) receives  the message,
>  > > node B learns an entry of SID A with a nexthop, where  the nexthop is
>  > > the shortest path to SRMS but not to node A.
>  >
>  > what is the problem? In SR domain no matter what is the next hop, SID is
>  > a global index and the value of index is bound to a prefix on all nodes.
>  > In a non-SR domain, SID is not used at all.
>
> [Ting] When a SID is allocated to a non SR node, it is used to indicate
> the packet
> sending from SR domain to non SR domain, it must be sent to SRMS,
> otherwise how the SID convert to LDP label.

above statement is incorrect. SRMS does not require traffic flowing from 
SR domain to non-SR domain to transit via SRMS.

If the router(s) in the border of the SR and non-SR domain are smart 
enough, they can stich the LSP based on info from SRMS and LDP.



> The detail has been described in the mailing list replied to Rabah.
>
>  > > Of course the SRMS can be used to allocate a SID（SID C）to a SR
>  > > node(node C),
>  > > when SR node B learns  this message , it still learns the nexthop
> is the
>  > > shortest path to SRMS，
>  > > and in this case，the nexthop should be to node C.
>  > >
>  > > In this proposal, the nexthop is to SR node C.
>  > >
>  > > 3.  In the allocation TLV described in this draft, it can carry
> other SR
>  > > related configuration such as algorithm, MT number,
>  > > and in a TLV, it can carry one or more ip addresses, no matter the
>  > > addresses are consecutive or inconsecutive.
>  >
>  > advertising a capability of a remote node from the SRMN can become
>  > dangerous, especially if the node is not configured consistently with
>  > what is advertised from the SRMN.
>
> [Ting] Do you mean that it is dangerous for the SRMN to allocate the SID?

no, it's dangerous for SRMN to advertise the capabilities of the remote 
nodes.

regards,
Peter
> The SRMN allocates SR related configuration includes SID etc.
>
>  > regards,
>  > Peter
>  >
>  > >
>  > > Best Regards.
>  > > Ting
>  > >
>  > > "spring" <spring-bounces@ietf.org> 写于 2015-03-10 21:49:49:
>  > >
>  > >  > The mapping server is attended to bind prefixes and SID of  non
>  > >  > SPRING nodes, not to configure a SPRING node see https://tools.ietf.
>  > >  >
> org/html/draft-filsfils-spring-segment-routing-ldp-interop-02#section-4.2
>  > >  >
>  > >  > Configuring SPRING nodes can be done manually or via a centralized
>  > > entity,
>  > >  > The centralized entity can be an SDN controller or an extended
>  > >  > mapping server, configs can be pushed using OpenFlow or NETCONFIG
>  > > /YANG see
>  > >  > https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>  > >  >
>  > >  > In my opinion we should work on the process of configuring SPRING
>  > >  > nodes, the architecture(SR-client and SR-controller) and defining
>  > >  > the minimum configs for a node to function properly.
>  > >  >
>  > >  > Nether the proposed draft nor the section on the mapping server
>  > >  > addressed those requirements.
>  > >  >
>  > >  > There are two types of configurations that need to be pushed to
>  > >  > SPRING nodes  : Required and Optional
>  > >  > Required configs : are all the information that has global
>  > >  > signification like node-SID, anycast-SID,++ ..., or when decided to
>  > >  > use the same SRGB on all the SPRING nodes, those config must be done
>  > >  > manually or pushed from centralized entity.
>  > >  > Optional configs : all the decision that can be made locally by the
>  > >  > "SR-client"  like assigning Adj-SIDs to the node interfaces.
>  > >  >
>  > >  >
>  > >  > -----Message d'origine-----
>  > >  > De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano
>  > >  > Previdi (sprevidi)
>  > >  > Envoyé : mardi 10 mars 2015 13:07
>  > >  > À : Peter Psenak (ppsenak)
>  > >  > Cc : spring@ietf.org; <liao.ting@zte.com.cn>
>  > >  > Objet : Re: [spring] New Version Notification for draft-lw-spring-
>  > >  > sid-allocation-01.txt
>  > >  >
>  > >  > I agree. We already have interop tests done on the SRMS so what is
>  > >  > the real added value of another proposal ?
>  > >  >
>  > >  > s.
>  > >  >
>  > >  >
>  > >  > On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com>
> wrote:
>  > >  >
>  > >  > > Ting,
>  > >  > >
>  > >  > > there is a concept of SR Mapping Server, which can be used to
>  > >  > advertise SIDs for prefixes from the central place.
>  > >  > >
>  > >  > > draft-ietf-ospf-segment-routing-extensions defines the OSPF
>  > >  > Extended Prefix Range TLV in section 4 which is used to advertise
>  > >  > the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar
>  > >  > mechanism in ISIS. There are already implementations that
> support SRMS.
>  > >  > >
>  > >  > > What you defined in your draft looks very similar to SRMS and we
>  > >  > definitely do not need two different ways to achieve the same goal.
>  > >  > >
>  > >  > > regards,
>  > >  > > Peter
>  > >  > >
>  > >  > > On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>  > >  > >>
>  > >  > >> Hi all,
>  > >  > >>
>  > >  > >> New version of SID Allocation has been published and
> description has
>  > >  > >> been revised according to comments from the mailing list.
>  > >  > >> Comments are welcome and discussions in Dallas are expected.
>  > >  > >>
>  > >  > >> Best Regards.
>  > >  > >> Ting
>  > >  > >> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>  > >  > >>
>  > >  > >> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>  > >  > >>
>  > >  > >> >
>  > >  > >> > A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>  > >  > >> > has been successfully submitted by Fangwei Hu and posted to the
>  > >  > >> > IETF repository.
>  > >  > >> >
>  > >  > >> > Name:      draft-lw-spring-sid-allocation
>  > >  > >> > Revision:   01
>  > >  > >> > Title:      SPRING SID Allocation
>  > >  > >> > Document date:   2015-03-08
>  > >  > >> > Group:      Individual Submission
>  > >  > >> > Pages:      12
>  > >  > >> > URL:  http://www.ietf.org/internet-drafts/draft-lw-spring-
>  > >  > >> > sid-allocation-01.txt
>  > >  > >> > Status: https://datatracker.ietf.org/doc/draft-lw-spring-
>  > >  > >> > sid-allocation/
>  > >  > >> > Htmlized:
>  > >  > >> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>  > >  > >> > Diff: http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>  > >  > >> > sid-allocation-01
>  > >  > >> >
>  > >  > >> > Abstract:
>  > >  > >> >    Segment Routing (SR) allows for a flexible definition of
>  > > end-to-end
>  > >  > >> >    paths within IGP topologies by encoding paths as
> sequences of
>  > >  > >> >    topological sub-paths, called "segments".  These
> segments are
>  > >  > >> >    advertised by the link-state routing protocols (IS-IS and
>  > > OSPF).  And
>  > >  > >> >    a segment is identified by a Segment Routing ID (SID).  This
>  > > document
>  > >  > >> >    proposes a method to reduce the SID configuration in a
> SR domain.
>  > >  > >> >    Only the selected SR nodes which named Segment Routing
> Management
>  > >  > >> >    Nodes (SRMNs) are configured by NMS, while other SRs in the
>  > > domain
>  > >  > >> >    need zero-SR-configuration.
>  > >  > >> >
>  > >  > >> >
>  > >  > >> >
>  > >  > >> >
>  > >  > >> > 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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On 3/12/15 08:02 , liao.ting@zte.com.cn wrote:
>
> Hi Rabah,
>
> If the nexthop learnt from the mapping message is the nexthop to the
> prefix of non SR node,
> as shown in the figure:
>
> The SRMS allocates a SID label 105 to a non SR node LR5,
> SR1 learns the message, and the nexthop of SR1 to LR5 is to R4,
> SR4 and LR5 is a normal IGP adjancency without label.
> When SR1 sending out a packet with a top label 105, the nexthop is to R4,

given that SR is not running on a link between SR1 and SR4, SR1 would 
send packet as unlabeled to R4.

Peter

> R4 receives the mpls packet, but it doesn’t have a label forwarding
> entry, it will drop the packet.
>
> Best Regards.
> Ting
>
> "spring" <spring-bounces@ietf.org> 写于 2015-03-11 18:08:02:
>
>  > >Hi, Please see inline[Rabah]
>  >
>  > De : liao.ting@zte.com.cn [mailto:liao.ting@zte.com.cn]
>  > Envoyé : mercredi 11 mars 2015 10:33
>  > À : GUEDREZ Rabah IMT/OLN; Peter Psenak (ppsenak); Stefano Previdi
> (sprevidi)
>  > Cc : spring@ietf.org; spring
>  > Objet : Re: [spring] New Version Notification for draft-lw-spring-
>  > sid-allocation-01.txt
>  >
>  >
>  > Hi rabah，peter，stefano,
>  >
>  > Thanks for your reviews and comments. The SID allocation proposal is
> used to
>  > solve the automatic SID configuration based on the operator's
>  > requirment of zero configuration for the nodes.
>  > It includes the following differences with SRMS：
>  >
>  > 1.  It has a mechanism to ensure the uniqueness of SID allocation.
>  > When two or more SRMNs(SR management nodes described in this draft)
>  > allocate different SIDs to the same prefix,
>  > we provide a method for the SR nodes to choose one of the SID in
> theproposal.
>  >
>  > 2.  The SRMN only allocates SID to SR node in this draft.
>  > I wonder there may be some problem if SRMS can allocates SID to non-
>  > SR node and SR node.
>  >
>  > For example, the SRMS is in charge of mapping a SID( SID A) to a non
> SR node（
>  > node A）originally,
>  > and then SRMS floods the mapping message to SR domain, when a SR
>  > node(node B) receives  the message,
>  > node B learns an entry of SID A with a nexthop, where  the nexthop
>  > is the shortest path to SRMS but not to node A.
>  > Of course the SRMS can be used to allocate a SID（SID C）to a SR
>  > node(node C),
>  > when SR node B learns  this message , it still learns the nexthop is
>  > the shortest path to SRMS，
>  > and in this case，the nexthop should be to node C.
>  > >[Rabah]  No this not true upon the reception of  the mapping SID-A
>  > prefix Z by any SR-Node , the node IGP-SPF will match the SID A
>  > prefix with its routing table and calculate
>  >   the shortest path(exit interface) to that prefix and install an
>  > entry in the NHFE( Next Hop Label   Forwarding Entry).
>  >
>  >
>  > In this proposal, the nexthop is to SR node C.
>  >
>  > 3.  In the allocation TLV described in this draft, it can carry
>  > other SR related configuration such as algorithm, MT number,
>  > and in a TLV, it can carry one or more ip addresses, no matter the
>  > addresses are consecutive or inconsecutive.
>  >
>  > Best Regards.
>  > Ting
>  >
>  > "spring" <spring-bounces@ietf.org> 写于 2015-03-10 21:49:49:
>  >
>  > > The mapping server is attended to bind prefixes and SID of  non
>  > > SPRING nodes, not to configure a SPRING node see https://tools.ietf.
>  > >
> org/html/draft-filsfils-spring-segment-routing-ldp-interop-02#section-4.2
>  > >
>  > > Configuring SPRING nodes can be done manually or via a centralized
> entity,
>  > > The centralized entity can be an SDN controller or an extended
>  > > mapping server, configs can be pushed using OpenFlow or NETCONFIG
> /YANG see
>  > > https://tools.ietf.org/id/draft-litkowski-spring-sr-yang-00.txt
>  > >
>  > > In my opinion we should work on the process of configuring SPRING
>  > > nodes, the architecture(SR-client and SR-controller) and defining
>  > > the minimum configs for a node to function properly.
>  > >
>  > > Nether the proposed draft nor the section on the mapping server
>  > > addressed those requirements.
>  > >
>  > > There are two types of configurations that need to be pushed to
>  > > SPRING nodes  : Required and Optional
>  > > Required configs : are all the information that has global
>  > > signification like node-SID, anycast-SID,++ ..., or when decided to
>  > > use the same SRGB on all the SPRING nodes, those config must be done
>  > > manually or pushed from centralized entity.
>  > > Optional configs : all the decision that can be made locally by the
>  > > "SR-client"  like assigning Adj-SIDs to the node interfaces.
>  > >
>  > >
>  > > -----Message d'origine-----
>  > > De : spring [mailto:spring-bounces@ietf.org] De la part de Stefano
>  > > Previdi (sprevidi)
>  > > Envoyé : mardi 10 mars 2015 13:07
>  > > À : Peter Psenak (ppsenak)
>  > > Cc : spring@ietf.org; <liao.ting@zte.com.cn>
>  > > Objet : Re: [spring] New Version Notification for draft-lw-spring-
>  > > sid-allocation-01.txt
>  > >
>  > > I agree. We already have interop tests done on the SRMS so what is
>  > > the real added value of another proposal ?
>  > >
>  > > s.
>  > >
>  > >
>  > > On Mar 10, 2015, at 12:46 PM, Peter Psenak <ppsenak@cisco.com> wrote:
>  > >
>  > > > Ting,
>  > > >
>  > > > there is a concept of SR Mapping Server, which can be used to
>  > > advertise SIDs for prefixes from the central place.
>  > > >
>  > > > draft-ietf-ospf-segment-routing-extensions defines the OSPF
>  > > Extended Prefix Range TLV in section 4 which is used to advertise
>  > > the SID mappings by SRMS. Similarly ISIS SR drafts defines a similar
>  > > mechanism in ISIS. There are already implementations that support SRMS.
>  > > >
>  > > > What you defined in your draft looks very similar to SRMS and we
>  > > definitely do not need two different ways to achieve the same goal.
>  > > >
>  > > > regards,
>  > > > Peter
>  > > >
>  > > > On 3/10/15 07:02 , liao.ting@zte.com.cn wrote:
>  > > >>
>  > > >> Hi all,
>  > > >>
>  > > >> New version of SID Allocation has been published and description
> has
>  > > >> been revised according to comments from the mailing list.
>  > > >> Comments are welcome and discussions in Dallas are expected.
>  > > >>
>  > > >> Best Regards.
>  > > >> Ting
>  > > >> ----- 转发人 廖婷038768/user/zte_ltd 时间 2015-03-10 08:48 -----
>  > > >>
>  > > >> internet-drafts@ietf.org 写于 2015-03-09 14:39:17:
>  > > >>
>  > > >> >
>  > > >> > A new version of I-D, draft-lw-spring-sid-allocation-01.txt
>  > > >> > has been successfully submitted by Fangwei Hu and posted to the
>  > > >> > IETF repository.
>  > > >> >
>  > > >> > Name:      draft-lw-spring-sid-allocation
>  > > >> > Revision:   01
>  > > >> > Title:      SPRING SID Allocation
>  > > >> > Document date:   2015-03-08
>  > > >> > Group:      Individual Submission
>  > > >> > Pages:      12
>  > > >> > URL:
>   http://www.ietf.org/internet-drafts/draft-lw-spring-
>  > > >> > sid-allocation-01.txt
>  > > >> > Status:         https://datatracker.ietf.org/doc/draft-lw-spring-
>  > > >> > sid-allocation/
>  > > >> > Htmlized:
>  > > >> http://tools.ietf.org/html/draft-lw-spring-sid-allocation-01
>  > > >> > Diff:           http://www.ietf.org/rfcdiff?url2=draft-lw-spring-
>  > > >> > sid-allocation-01
>  > > >> >
>  > > >> > Abstract:
>  > > >> >    Segment Routing (SR) allows for a flexible definition of
> end-to-end
>  > > >> >    paths within IGP topologies by encoding paths as sequences of
>  > > >> >    topological sub-paths, called "segments".  These segments are
>  > > >> >    advertised by the link-state routing protocols (IS-IS and
>  > OSPF).  And
>  > > >> >    a segment is identified by a Segment Routing ID (SID).
>  > This document
>  > > >> >    proposes a method to reduce the SID configuration in a SR
> domain.
>  > > >> >    Only the selected SR nodes which named Segment Routing
> Management
>  > > >> >    Nodes (SRMNs) are configured by NMS, while other SRs in the
> domain
>  > > >> >    need zero-SR-configuration.
>  > > >> >
>  > > >> >
>  > > >> >
>  > > >> >
>  > > >> > 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.
>  > > >> >
>  > > >> > The IETF Secretariat
>  > > >> >
>  > > >>
>  > > >>
>  > > >> _______________________________________________
>  > > >> spring mailing list
>  > > >> spring@ietf.org
>  > > >> https://www.ietf.org/mailman/listinfo/spring
>  > > >>
>  > > >
>  > > > _______________________________________________
>  > > > spring mailing list
>  > > > spring@ietf.org
>  > > > https://www.ietf.org/mailman/listinfo/spring
>  > >
>  > > _______________________________________________
>  > > spring mailing list
>  > > spring@ietf.org
>  > > https://www.ietf.org/mailman/listinfo/spring
>  > >
>  > >
>  >
> _________________________________________________________________________________________________________________________
>  > >
>  > > Ce message et ses pieces jointes peuvent contenir des informations
>  > > confidentielles ou privilegiees et ne doivent donc
>  > > pas etre diffuses, exploites ou copies sans autorisation. Si vous
>  > > avez recu ce message par erreur, veuillez le signaler
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>  > > messages electroniques etant susceptibles d'alteration,
>  > > Orange decline toute responsabilite si ce message a ete altere,
>  > > deforme ou falsifie. Merci.
>  > >
>  > > This message and its attachments may contain confidential or
>  > > privileged information that may be protected by law;
>  > > they should not be distributed, used or copied without authorisation.
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>  > > As emails may be altered, Orange is not liable for messages that
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>  > > https://www.ietf.org/mailman/listinfo/spring
>  >
> _________________________________________________________________________________________________________________________
>  >
>  > Ce message et ses pieces jointes peuvent contenir des informations
>  > confidentielles ou privilegiees et ne doivent donc
>  > pas etre diffuses, exploites ou copies sans autorisation. Si vous
>  > avez recu ce message par erreur, veuillez le signaler
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>  > Orange decline toute responsabilite si ce message a ete altere,
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>  >
>  > This message and its attachments may contain confidential or
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Subject: Re: [spring] New Version Notification for draft-lw-spring-sid-allocation-01.txt
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On 3/12/15 09:33 , liao.ting@zte.com.cn wrote:
> [Ting] In the SID allocation solution, the SRMN is not in charge of
> allocate the capabilities.


"In the allocation TLV described in this draft, it can carry
other SR related configuration such as algorithm, MT number, ..."


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Subject: [spring] SPRING agenda posted
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Folks,

The agenda has been posted, you can find it at =
http://www.ietf.org/proceedings/92/agenda/agenda-92-spring

We had many more requests and suggestions for presentations than we were =
able to accommodate. We prioritized in favor of items that are needed to =
advance the WG charter over others that while related or interesting =
don't directly advance the charter. As always, we encourage you to use =
the mailing list to discuss your drafts -- there is no need to wait for =
a meeting and presentation to start your discussion! Some of you have =
done this and gotten productive discussion from it, thank you.

Looking forward to seeing you in Dallas.=20

--John=


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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [spring] =?utf-8?b?562U5aSNOiBSZTogIE5ldyBWZXJzaW9uIE5vdGlmaWNh?= =?utf-8?q?tion_for_draft-lw-spring-sid-allocation-01=2Etxt?=
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On 3/12/15 10:54 , liao.ting@zte.com.cn wrote:
>
> "spring" <spring-bounces@ietf.org> 写于 2015-03-12 17:42:29:
>
>  > On 3/12/15 09:33 , liao.ting@zte.com.cn wrote:
>  > > [Ting] In the SID allocation solution, the SRMN is not in charge of
>  > > allocate the capabilities.
>  >
>  >
>  > "In the allocation TLV described in this draft, it can carry
>  > other SR related configuration such as algorithm, MT number, ..."
>  >
>  > _______________________________________________
>  > spring mailing list
>  > spring@ietf.org
>  > https://www.ietf.org/mailman/listinfo/spring
>
> Algorithm and MT(multi-topology) ID both are configuration values,
> advertising within the SID allocation TLV,
> and the new draft-ietf-isis-segment-routing-extensions-03 added the
> extension of the algorithm in the binding tlv:

right, but they are advertised by the router itself, not by some central 
entity.

Peter


>        0           1         2       3
>       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 6 7 8 9 0 1
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |      Type     | Length    |0|0|           | Weight    |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |            Range = 4        |       /32     |    192      |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |       .0      |    .2     |       .1      |Prefix-SID Type|
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      | sub-TLV Length|     Flags     | Algorithm |       |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |       1 |
>      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
>
>
> Best Regards.
> Ting
>
>
> _______________________________________________
> spring mailing list
> spring@ietf.org
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>


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

        Title           : Use-cases for Resiliency in SPRING
        Authors         : Pierre Francois
                          Clarence Filsfils
                          Bruno Decraene
                          Rob Shakir
	Filename        : draft-ietf-spring-resiliency-use-cases-01.txt
	Pages           : 8
	Date            : 2015-03-23

Abstract:
   This document describes the use cases for resiliency in SPRING
   networks.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-spring-resiliency-use-cases/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-spring-resiliency-use-cases-01

A diff from the previous version is available at:
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--047d7b343c9cdf82030511f73aa2
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Cross posting to SPRING WG

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Thu, Mar 5, 2015 at 9:10 PM
Subject: [mpls] I-D Action: draft-ietf-mpls-spring-entropy-label-00.txt
To: i-d-announce@ietf.org
Cc: mpls@ietf.org



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

        Title           : Entropy labels for source routed stacked tunnels
        Authors         : Sriganesh Kini
                          Kireeti Kompella
                          Siva Sivabalan
                          Stephane Litkowski
                          Rob Shakir
                          Xiaohu Xu
                          Wim Hendrickx
                          Jeff Tantsura
        Filename        : draft-ietf-mpls-spring-entropy-label-00.txt
        Pages           : 11
        Date            : 2015-03-05

Abstract:
   Source routed tunnel stacking is a technique that can be leveraged to
   provide a method to steer a packet through a controlled set of
   segments.  This can be applied to the Multi Protocol Label Switching
   (MPLS) data plane.  Entropy label (EL) is a technique used in MPLS to
   improve load balancing.  This document examines and describes how ELs
   are to be applied to source routed stacked tunnels.


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

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-00


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

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_______________________________________________
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<div dir=3D"ltr">Cross posting to SPRING WG<div><br><div class=3D"gmail_quo=
te">---------- Forwarded message ----------<br>From: <b class=3D"gmail_send=
ername"></b> <span dir=3D"ltr">&lt;<a href=3D"mailto:internet-drafts@ietf.o=
rg">internet-drafts@ietf.org</a>&gt;</span><br>Date: Thu, Mar 5, 2015 at 9:=
10 PM<br>Subject: [mpls] I-D Action: draft-ietf-mpls-spring-entropy-label-0=
0.txt<br>To: <a href=3D"mailto:i-d-announce@ietf.org">i-d-announce@ietf.org=
</a><br>Cc: <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br><br><br><=
br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
=C2=A0This draft is a work item of the Multiprotocol Label Switching Workin=
g Group of the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Entropy labels for source routed stacked tunnels<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Srig=
anesh Kini<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Kireeti Kompella<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Siva Sivabalan<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Stephane Litkowski<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Rob Shakir<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Xiaohu Xu<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Wim Hendrickx<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Jeff Tantsura<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-mpls-spring-entropy-label-00.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 11<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2015-03-05<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Source routed tunnel stacking is a technique that can be lever=
aged to<br>
=C2=A0 =C2=A0provide a method to steer a packet through a controlled set of=
<br>
=C2=A0 =C2=A0segments.=C2=A0 This can be applied to the Multi Protocol Labe=
l Switching<br>
=C2=A0 =C2=A0(MPLS) data plane.=C2=A0 Entropy label (EL) is a technique use=
d in MPLS to<br>
=C2=A0 =C2=A0improve load balancing.=C2=A0 This document examines and descr=
ibes how ELs<br>
=C2=A0 =C2=A0are to be applied to source routed stacked tunnels.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mpls-spring-entropy-=
label/" target=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-mpls-=
spring-entropy-label/</a><br>
<br>
There&#39;s also a htmlized version available at:<br>
<a href=3D"http://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-=
00" target=3D"_blank">http://tools.ietf.org/html/draft-ietf-mpls-spring-ent=
ropy-label-00</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" target=3D"_blank">ftp://ftp=
.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
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" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><br>
</div><br></div></div>

--047d7b343c9cdf82030511f73aa2--


From nobody Mon Mar 23 14:08:42 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: request to reconsider the new version of draft-xu-sfc-using-mpls-spring
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Date: Mon, 23 Mar 2015 21:08:26 +0000
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Subject: [spring] request to reconsider the new version of draft-xu-sfc-using-mpls-spring
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Hi SFC co-chairs,

I have remove those options (i.e., encoding SFC using a label stack consist=
 of global labels and inserting a protocol field after the label stack for =
MPLS payload indication) which would cause changes to the MPLS architecture=
 in the latest version (http://tools.ietf.org/html/draft-xu-sfc-using-mpls-=
spring-03).=20

Therefore, we co-authors think it's now becoming suitable for the SFC WG to=
 reconsider this simplified MPLS-SPRING-based SFC solution which doesn't re=
quire any change to the MPLS base architecture.

Best regards,
Xiaohu

> -----Original Message-----
> From: Xuxiaohu
> Sent: Friday, March 06, 2015 8:49 AM
> To: 'Jim Guichard (jguichar)'; Ron Parker
> Cc: mpls at ietf.org; <spring at ietf.org>; sfc at ietf.org
> Subject: RE: [sfc] New Version Notification for=20
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Hi Jim,
>=20
> Understood.
>=20
> Best regards,
> Xiaohu
>=20
> > -----Original Message-----
> > From: Jim Guichard (jguichar) [mailto:jguichar at cisco.com]
> > Sent: Thursday, March 05, 2015 11:11 PM
> > To: Ron Parker; Xuxiaohu
> > Cc: mpls at ietf.org; <spring at ietf.org>; sfc at ietf.org
> > Subject: Re: [sfc] New Version Notification for=20
> > draft-xu-sfc-using-mpls-spring-02.txt
> >
> > Hi Xiaohu,
> >
> > Thomas and I read your latest draft and believe that you will need=20
> > to take it to the MPLS WG as a first step. There are a number of=20
> > things within the document that may require changes to the base MPLS=20
> > architecture and the SFC WG is not the right community to address=20
> > those. Given this we will not be able to consider this document in=20
> > the SFC WG without agreement from the broader MPLS community.
> >
> > Regards,
> >
> > Jim & Thomas


From nobody Mon Mar 23 14:40:47 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: Re: [sfc] New Version Notification for draft-xu-sfc-using-mpls-spring-02.txt
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Hi SFC co-chairs,

I have remove those options (i.e., encoding SFC using a label stack consist=
 of global labels and inserting a protocol field after the label stack for =
MPLS payload indication) which would cause changes to the MPLS architecture=
 in the latest version (http://tools.ietf.org/html/draft-xu-sfc-using-mpls-=
spring-03).=20

Therefore, we co-authors think it's now becoming suitable for the SFC WG to=
 reconsider this simplified MPLS-SPRING-based SFC solution which doesn't re=
quire any change to the MPLS base architecture.

Best regards,
Xiaohu

> -----Original Message-----
> From: Xuxiaohu
> Sent: Friday, March 06, 2015 8:49 AM
> To: 'Jim Guichard (jguichar)'; Ron Parker
> Cc: mpls at ietf.org; <spring at ietf.org>; sfc at ietf.org
> Subject: RE: [sfc] New Version Notification for
> draft-xu-sfc-using-mpls-spring-02.txt
>=20
> Hi Jim,
>=20
> Understood.
>=20
> Best regards,
> Xiaohu
>=20
> > -----Original Message-----
> > From: Jim Guichard (jguichar) [mailto:jguichar at cisco.com]
> > Sent: Thursday, March 05, 2015 11:11 PM
> > To: Ron Parker; Xuxiaohu
> > Cc: mpls at ietf.org; <spring at ietf.org>; sfc at ietf.org
> > Subject: Re: [sfc] New Version Notification for
> > draft-xu-sfc-using-mpls-spring-02.txt
> >
> > Hi Xiaohu,
> >
> > Thomas and I read your latest draft and believe that you will need to
> > take it to the MPLS WG as a first step. There are a number of things
> > within the document that may require changes to the base MPLS
> > architecture and the SFC WG is not the right community to address
> > those. Given this we will not be able to consider this document in the
> > SFC WG without agreement from the broader MPLS community.
> >
> > Regards,
> >
> > Jim & Thomas


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From: Santanu Kar <santanu.kar2000@gmail.com>
To: spring@ietf.org, ppsenak@cisco.com, hannes@juniper.net, rob.shakir@bt.com,  wim.henderickx@alcatel-lucent.com, jeff.tantsura@ericsson.com
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Subject: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Hi Authors

The Section 2, doesn't provide any clarification on the 'Instance' part of
the Link ID of
OSPFv2 Extended Prefix Opaque LSA.

There can be two possible implementations

1) When a Segment routing enabled router is advertising multiple Ext Prefix
TLV, it can keep repacking it into a single Ext Prefix LSA, as has been
mentioned in end of section 2 and keep increasing the instance . The lowest
instance is taken. Higher instance from same router for same prefix is
ignored.

2) Another possible way is, not to go for this repacking. Instead it should
be possible to originate separate Ext Prefix LSAs for every Ext Prefix TLV,
and only one TLV per LSA. The instance number or Opaque id can be derived
from the prefix/interface so as to ensure its unique for every prefix
originating from the same advertising router.

The draft is not clear on whether (2) can be allowed. It hasn't mentioned
that the instance is topology independent and dependent on how we choose to
implement it. The TE RFC however has a section devoted to this
https://tools.ietf.org/html/rfc3630#section-2.2

Please give your thoughts on this.

Regards
Santanu

--001a113434727477c905121c972d
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<div dir=3D"ltr"><div><div><div><div><div><div><div>Hi Authors<br><br></div=
>The Section 2, doesn&#39;t provide any clarification on the &#39;Instance&=
#39; part of the Link ID of <br></div>OSPFv2 Extended Prefix Opaque LSA.<br=
><br></div>There can be two possible implementations<br><br></div>1) When a=
 Segment routing enabled router is advertising multiple Ext Prefix TLV, it =
can keep repacking it into a single Ext Prefix LSA, as has been mentioned i=
n end of section 2 and keep increasing the instance . The lowest instance i=
s taken. Higher instance from same router for same prefix is ignored.<br><b=
r></div>2) Another possible way is, not to go for this repacking. Instead i=
t should be possible to originate separate Ext Prefix LSAs for every Ext Pr=
efix TLV, and only one TLV per LSA. The instance number or Opaque id can be=
 derived from the prefix/interface so as to ensure its unique for every pre=
fix originating from the same advertising router.<br><br></div><div>The dra=
ft is not clear on whether (2) can be allowed. It hasn&#39;t mentioned that=
 the instance is topology independent and dependent on how we choose to imp=
lement it. The TE RFC however has a section devoted to this<br></div><a hre=
f=3D"https://tools.ietf.org/html/rfc3630#section-2.2">https://tools.ietf.or=
g/html/rfc3630#section-2.2</a><br><br></div><div>Please give your thoughts =
on this.<br></div><div><br></div><div>Regards<br></div><div>Santanu<br></di=
v><div><div><br><div><div><div><div><div><div><pre class=3D"" style=3D"font=
-size:1em;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:norm=
al;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height=
:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0=
px"><span class=3D"" style=3D"line-height:0pt;display:inline;white-space:pr=
e;font-family:monospace;font-size:1em;font-weight:bold"><p><br></p></span><=
/pre></div></div></div></div></div></div></div></div></div>

--001a113434727477c905121c972d--


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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Hi Santanu,

On 3/25/15 14:08 , Santanu Kar wrote:
> Hi Authors
>
> The Section 2, doesn't provide any clarification on the 'Instance' part
> of the Link ID of
> OSPFv2 Extended Prefix Opaque LSA.

Instance is an arbitrary number to make each OSPFv2 Extended Prefix 
Opaque LSA's LSID unique, please see RFC5250, section abut Opaque-ID.

>
> There can be two possible implementations
>
> 1) When a Segment routing enabled router is advertising multiple Ext
> Prefix TLV, it can keep repacking it into a single Ext Prefix LSA, as
> has been mentioned in end of section 2 and keep increasing the instance
> . The lowest instance is taken. Higher instance from same router for
> same prefix is ignored.

above only applies to the case where OSPFv2 Extended Prefix TLV is 
advertised for the _same_ prefix in multiple different OSPFv2 Extended 
Prefix Opaque LSAs, which is either an error or temporary condition.


>
> 2) Another possible way is, not to go for this repacking. Instead it
> should be possible to originate separate Ext Prefix LSAs for every Ext
> Prefix TLV, and only one TLV per LSA. The instance number or Opaque id
> can be derived from the prefix/interface so as to ensure its unique for
> every prefix originating from the same advertising router.

yes above is correct, but the draft allows to pack multiple Ext
Prefix TLVs in the single Extended Prefix Opaquer LSA if the 
implementation prefers to do so.

>
> The draft is not clear on whether (2) can be allowed. It hasn't

the draft says:

Multiple OSPF Extended Prefix TLVs MAY be advertised in each OSPFv2 
Extended Prefix Opaque LSA."

That means it can be one or more.


> mentioned that the instance is topology independent and dependent on how
> we choose to implement it. The TE RFC however has a section devoted to this
> https://tools.ietf.org/html/rfc3630#section-2.2

I can add a similar text to draft-ietf-ospf-prefix-link-attr.


thanks,
Peter

>
> Please give your thoughts on this.
>
> Regards
> Santanu
>
>


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From: <stephane.litkowski@orange.com>
To: "Alvaro Retana (aretana)" <aretana@cisco.com>, "draft-ietf-spring-problem-statement@tools.ietf.org" <draft-ietf-spring-problem-statement@tools.ietf.org>
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Date: Wed, 25 Mar 2015 21:08:56 +0000
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Hi Alvaro,

In case you did not receive my reply, I'm not not aware of any IPR regardin=
g this draft.

Best Regards,


From: Alvaro Retana (aretana) [mailto:aretana@cisco.com]
Sent: Tuesday, September 23, 2014 13:35
To: draft-ietf-spring-problem-statement@tools.ietf.org
Cc: spring@ietf.org
Subject: IPR Claims related to draft-ietf-spring-problem-statement

Hi!

In parallel to the WGLC for this draft, I want to formally ask the authors =
(no additional contributors are listed in the latest version of the draft) =
to please respond to this message indicating whether or not you are aware o=
f any relevant IPR.  So far there are no related disclosures.  The draft wi=
ll not progress (pending the results of the WGLC) until we have received a =
response from each author.

Thanks!

Alvaro.


___________________________________________________________________________=
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Alvaro,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">In case you did not recei=
ve my reply, I&#8217;m not not aware of any IPR regarding this draft.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best Regards,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Alvaro R=
etana (aretana) [mailto:aretana@cisco.com]
<br>
<b>Sent:</b> Tuesday, September 23, 2014 13:35<br>
<b>To:</b> draft-ietf-spring-problem-statement@tools.ietf.org<br>
<b>Cc:</b> spring@ietf.org<br>
<b>Subject:</b> IPR Claims related to draft-ietf-spring-problem-statement<o=
:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Hi!<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">In parallel to the WGLC for=
 this draft,&nbsp;I want to formally ask the authors (no additional contrib=
utors are listed in the latest version of the draft) to please
 respond to this message indicating whether or not you are aware of any rel=
evant IPR. &nbsp;So far there are no related disclosures.&nbsp; The draft w=
ill not progress (pending the results of the WGLC) until we have received a=
 response from each author.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Thanks!<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Alvaro.<o:p></o:p></span></=
p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
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Date: Thu, 26 Mar 2015 15:36:12 +0100
From: Clarence Filsfils <cfilsfil@cisco.com>
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Subject: Re: [spring] Fwd: IPR Claims related to draft-ietf-spring-problem-statement
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John,

I am not aware of any IPR on this draft.

Cheers,
Clarence


On 25-Mar-15 21:50, John G. Scudder wrote:
> Guys,
>
> I don't believe either of you ever replied regarding IPR on this draft?
> Can you please reply to Alvaro's original request, with cc to the list?
> I'm trying to clear obstacles to publishing the document.
>
> Please forgive me if I missed your reply.
>
> Thanks,
>
> --John
>
> Begin forwarded message:
>
>> *From: *"Alvaro Retana (aretana)" <aretana@cisco.com
>> <mailto:aretana@cisco.com>>
>> *Subject: **[spring] IPR Claims related to
>> draft-ietf-spring-problem-statement*
>> *Date: *September 23, 2014 at 1:34:59 PM CDT
>> *To: *"draft-ietf-spring-problem-statement@tools.ietf.org
>> <mailto:draft-ietf-spring-problem-statement@tools.ietf.org>"
>> <draft-ietf-spring-problem-statement@tools.ietf.org
>> <mailto:draft-ietf-spring-problem-statement@tools.ietf.org>>
>> *Cc: *"spring@ietf.org <mailto:spring@ietf.org>" <spring@ietf.org
>> <mailto:spring@ietf.org>>
>>
>> Hi!
>>
>> In parallel to the WGLC for this draft, I want to formally ask the
>> authors (no additional contributors are listed in the latest version
>> of the draft) to please respond to this message indicating whether or
>> not you are aware of any relevant IPR.  So far there are no related
>> disclosures.  The draft will not progress (pending the results of the
>> WGLC) until we have received a response from each author.
>>
>> Thanks!
>>
>> Alvaro.
>>
>> _______________________________________________
>> spring mailing list
>> spring@ietf.org <mailto:spring@ietf.org>
>> https://www.ietf.org/mailman/listinfo/spring
>


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From: Santanu Kar <santanu.kar2000@gmail.com>
To: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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--90e6ba3fcb8974f61405127c2366
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Hi Peter

Thanks for the clarification.

I still do not completely agree that scenario (1) is a 'error or temporary
condition'.

Scenario A: Lets consider we have a network of routers and each router has
48 ports and OSPF routing enabled on all. We want to replace LDP in the
network and have Prefix Segment based label  mappings for all prefixes in
the network. So while configuring for the first time, each prefix with a
prefix SID one by one, OSPF will send out 48 Ext Prefix LSAs. The first one
will have only one Prefix TLV, the next one two, and subsequent ones keep
adding the additional Prefix TLVs and repacking into the LSA. All the LSAs
will keep having incremental instance. So the first prefix is advertised 48
times by the same router in different Ext Prefix LSAs.

There are few more scenarios that needs to be considered for
Multiple-Prefix TLV .Consider the following.

Scenario B: Withdrawing of Prefix TLV. If on a particular router the prefix
SID configured for one of its prefixes is unconfigured, the router needs to
withdraw that specific Prefix TLV from the OSPF network. If this Prefix TLV
was part of one or more LSA as described in scenario A, then all such LSAs
needs to be withdrawn by issuing a LSA of MaxAge. Also since each LSA has
multiple Prefix TLVs , all other Prefix-TLVs in that LSA will also get
effected. This is undesirable. Even if there is no duplicate prefix TLVs
across LSAs, this problem is applicable for the LSA which is withdrawn.

I propose the following solutions for this problem.
i) The Ext Prefix LSA can have a fixed instance number associated with it.
Whenever a prefix-TLV is received, as part of any Ext Prefix LSA, it needs
to check for any modifications from the previous LSA. If none, it will
ignore that prefix-TLV. Else it will be updated. In this way, even if a
particular prefix-TLV is sent multiple times , and the latest one is
considered as per the age of LSA, it will have no impact internally on the
routes corresponding to that Prefix. Also it will significantly reduce the
Link State Database to be maintained, and it will always be one per router.
Any new prefix TLV in the new LSA will be added, and if any prefix TLV
previously advertised is missing, will be removed.

ii) The Ext Prefix LSA can allow only a single Top Level TLV per LSA. Here
announcing new Prefix and its withdraw can happen individually and will be
a much simpler approach. This is similar to approach followed in OSPF TE (
https://tools.ietf.org/html/rfc3630#section-2.4)

Regards
Santanu

On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <ppsenak@cisco.com> wrote:

> Hi Santanu,
>
> On 3/25/15 14:08 , Santanu Kar wrote:
>
>> Hi Authors
>>
>> The Section 2, doesn't provide any clarification on the 'Instance' part
>> of the Link ID of
>> OSPFv2 Extended Prefix Opaque LSA.
>>
>
> Instance is an arbitrary number to make each OSPFv2 Extended Prefix Opaque
> LSA's LSID unique, please see RFC5250, section abut Opaque-ID.
>
>
>> There can be two possible implementations
>>
>> 1) When a Segment routing enabled router is advertising multiple Ext
>> Prefix TLV, it can keep repacking it into a single Ext Prefix LSA, as
>> has been mentioned in end of section 2 and keep increasing the instance
>> . The lowest instance is taken. Higher instance from same router for
>> same prefix is ignored.
>>
>
> above only applies to the case where OSPFv2 Extended Prefix TLV is
> advertised for the _same_ prefix in multiple different OSPFv2 Extended
> Prefix Opaque LSAs, which is either an error or temporary condition.
>
>
>
>> 2) Another possible way is, not to go for this repacking. Instead it
>> should be possible to originate separate Ext Prefix LSAs for every Ext
>> Prefix TLV, and only one TLV per LSA. The instance number or Opaque id
>> can be derived from the prefix/interface so as to ensure its unique for
>> every prefix originating from the same advertising router.
>>
>
> yes above is correct, but the draft allows to pack multiple Ext
> Prefix TLVs in the single Extended Prefix Opaquer LSA if the
> implementation prefers to do so.
>
>
>> The draft is not clear on whether (2) can be allowed. It hasn't
>>
>
> the draft says:
>
> Multiple OSPF Extended Prefix TLVs MAY be advertised in each OSPFv2
> Extended Prefix Opaque LSA."
>
> That means it can be one or more.
>
>
>  mentioned that the instance is topology independent and dependent on how
>> we choose to implement it. The TE RFC however has a section devoted to
>> this
>> https://tools.ietf.org/html/rfc3630#section-2.2
>>
>
> I can add a similar text to draft-ietf-ospf-prefix-link-attr.
>
>
> thanks,
> Peter
>
>
>
>> Please give your thoughts on this.
>>
>> Regards
>> Santanu
>>
>>
>>
>


-- 
Best Regards
Santanu Kar
----------------------------------------------------------------------------------------------
When you really want something to happen, the whole universe
conspires so that your wish comes true
----------------------------------------------------------------------------------------------

--90e6ba3fcb8974f61405127c2366
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><br></div><div>Hi Peter</div><div><br></div><div>Than=
ks for the clarification.</div><div><br></div><div>I still do not completel=
y agree that scenario (1) is a &#39;error or temporary condition&#39;.</div=
><div><br></div><div>Scenario A: Lets consider we have a network of routers=
 and each router has 48 ports and OSPF routing enabled on all. We want to r=
eplace LDP in the network and have Prefix Segment based label =C2=A0mapping=
s for all prefixes in the network. So while configuring for the first time,=
 each prefix with a prefix SID one by one, OSPF will send out 48 Ext Prefix=
 LSAs. The first one will have only one Prefix TLV, the next one two, and s=
ubsequent ones keep adding the additional Prefix TLVs and repacking into th=
e LSA. All the LSAs will keep having incremental instance. So the first pre=
fix is advertised 48 times by the same router in different Ext Prefix LSAs.=
=C2=A0</div><div><br></div><div>There are few more scenarios that needs to =
be considered for Multiple-Prefix TLV .Consider the following.</div><div>=
=C2=A0=C2=A0</div><div>Scenario B: Withdrawing of Prefix TLV. If on a parti=
cular router the prefix SID configured for one of its prefixes is unconfigu=
red, the router needs to withdraw that specific Prefix TLV from the OSPF ne=
twork. If this Prefix TLV was part of one or more LSA as described in scena=
rio A, then all such LSAs needs to be withdrawn by issuing a LSA of MaxAge.=
 Also since each LSA has multiple Prefix TLVs , all other Prefix-TLVs in th=
at LSA will also get effected. This is undesirable. Even if there is no dup=
licate prefix TLVs across LSAs, this problem is applicable for the LSA whic=
h is withdrawn.</div><div><br></div><div>I propose the following solutions =
for this problem.</div><div>i) The Ext Prefix LSA can have a fixed instance=
 number associated with it. Whenever a prefix-TLV is received, as part of a=
ny Ext Prefix LSA, it needs to check for any modifications from the previou=
s LSA. If none, it will ignore that prefix-TLV. Else it will be updated. In=
 this way, even if a particular prefix-TLV is sent multiple times , and the=
 latest one is considered as per the age of LSA, it will have no impact int=
ernally on the routes corresponding to that Prefix. Also it will significan=
tly reduce the Link State Database to be maintained, and it will always be =
one per router. Any new prefix TLV in the new LSA will be added, and if any=
 prefix TLV previously advertised is missing, will be removed.=C2=A0</div><=
div><br></div><div>ii) The Ext Prefix LSA can allow only a single Top Level=
 TLV per LSA. Here announcing new Prefix and its withdraw can happen indivi=
dually and will be a much simpler approach. This is similar to approach fol=
lowed in OSPF TE (<a href=3D"https://tools.ietf.org/html/rfc3630#section-2.=
4">https://tools.ietf.org/html/rfc3630#section-2.4</a>)</div><div><br></div=
><div>Regards</div><div>Santanu</div></div><div class=3D"gmail_extra"><br><=
div class=3D"gmail_quote">On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">p=
psenak@cisco.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">Hi=
 Santanu,<span class=3D""><br>
<br>
On 3/25/15 14:08 , Santanu Kar wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Hi Authors<br>
<br>
The Section 2, doesn&#39;t provide any clarification on the &#39;Instance&#=
39; part<br>
of the Link ID of<br>
OSPFv2 Extended Prefix Opaque LSA.<br>
</blockquote>
<br></span>
Instance is an arbitrary number to make each OSPFv2 Extended Prefix Opaque =
LSA&#39;s LSID unique, please see RFC5250, section abut Opaque-ID.<span cla=
ss=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
There can be two possible implementations<br>
<br>
1) When a Segment routing enabled router is advertising multiple Ext<br>
Prefix TLV, it can keep repacking it into a single Ext Prefix LSA, as<br>
has been mentioned in end of section 2 and keep increasing the instance<br>
. The lowest instance is taken. Higher instance from same router for<br>
same prefix is ignored.<br>
</blockquote>
<br></span>
above only applies to the case where OSPFv2 Extended Prefix TLV is advertis=
ed for the _same_ prefix in multiple different OSPFv2 Extended Prefix Opaqu=
e LSAs, which is either an error or temporary condition.<span class=3D""><b=
r>
<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
2) Another possible way is, not to go for this repacking. Instead it<br>
should be possible to originate separate Ext Prefix LSAs for every Ext<br>
Prefix TLV, and only one TLV per LSA. The instance number or Opaque id<br>
can be derived from the prefix/interface so as to ensure its unique for<br>
every prefix originating from the same advertising router.<br>
</blockquote>
<br></span>
yes above is correct, but the draft allows to pack multiple Ext<br>
Prefix TLVs in the single Extended Prefix Opaquer LSA if the implementation=
 prefers to do so.<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
The draft is not clear on whether (2) can be allowed. It hasn&#39;t<br>
</blockquote>
<br></span>
the draft says:<br>
<br>
Multiple OSPF Extended Prefix TLVs MAY be advertised in each OSPFv2 Extende=
d Prefix Opaque LSA.&quot;<br>
<br>
That means it can be one or more.<span class=3D""><br>
<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
mentioned that the instance is topology independent and dependent on how<br=
>
we choose to implement it. The TE RFC however has a section devoted to this=
<br>
<a href=3D"https://tools.ietf.org/html/rfc3630#section-2.2" target=3D"_blan=
k">https://tools.ietf.org/html/<u></u>rfc3630#section-2.2</a><br>
</blockquote>
<br></span>
I can add a similar text to draft-ietf-ospf-prefix-link-<u></u>attr.<br>
<br>
<br>
thanks,<br>
Peter<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
Please give your thoughts on this.<br>
<br>
Regards<br>
Santanu<br>
<br>
<br>
</blockquote>
<br>
</div></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>=
<div class=3D"gmail_signature">Best Regards<br>Santanu Kar<br>-------------=
---------------------------------------------------------------------------=
------<br>When you really want something to happen, the whole universe <br>=
conspires so that your wish comes true<br>---------------------------------=
-------------------------------------------------------------</div>
</div>

--90e6ba3fcb8974f61405127c2366--


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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Santanu,

On 3/30/15 09:07 , Santanu Kar wrote:
>
> Hi Peter
>
> Thanks for the clarification.
>
> I still do not completely agree that scenario (1) is a 'error or
> temporary condition'.
>
> Scenario A: Lets consider we have a network of routers and each router
> has 48 ports and OSPF routing enabled on all. We want to replace LDP in
> the network and have Prefix Segment based label  mappings for all
> prefixes in the network. So while configuring for the first time, each
> prefix with a prefix SID one by one, OSPF will send out 48 Ext Prefix
> LSAs. The first one will have only one Prefix TLV, the next one two, and

more specifically, it will send 48 instances if the same LSA.

> subsequent ones keep adding the additional Prefix TLVs and repacking
> into the LSA. All the LSAs will keep having incremental instance. So the
> first prefix is advertised 48 times by the same router in different Ext
> Prefix LSAs.


yes, what is wrong with the above? The exact same thing happens with 
Router LSA today. If you do not like it, your implementation can 
generate a dedicated Ext. Prefix LSA for each prefix. Both ways are 
allowed. But your implementation MUST be able to deal with the received 
Ext. Prefix LSAs that have multiple Ext Prefix TLVs.

>
> There are few more scenarios that needs to be considered for
> Multiple-Prefix TLV .Consider the following.
> Scenario B: Withdrawing of Prefix TLV. If on a particular router the
> prefix SID configured for one of its prefixes is unconfigured, the
> router needs to withdraw that specific Prefix TLV from the OSPF network.
> If this Prefix TLV was part of one or more LSA as described in scenario

each prefix should be only advertised in a single Ext Prefix LSA...


> A, then all such LSAs needs to be withdrawn by issuing a LSA of MaxAge.
> Also since each LSA has multiple Prefix TLVs , all other Prefix-TLVs in
> that LSA will also get effected. This is undesirable. Even if there is
> no duplicate prefix TLVs across LSAs, this problem is applicable for the
> LSA which is withdrawn.

what you described above is incorrect. When Ext Prefix LSA has multiple 
Ext Prefix TLVs and you want to remove one of them, you simply 
regenerate the Ext Prefix LSA without the Ext Prefix TLV that 
corresponds to that prefix and keep the rest of the Ext Prefix TLVs in 
the LSA - these prefixes are NOT affected.

>
> I propose the following solutions for this problem.
> i) The Ext Prefix LSA can have a fixed instance number associated with

above is by definition - Instance (or Opaque-ID), is part of the LSID, 
which together with the Adv-Rtr-ID uniquely identifies the LSA itself.

> it. Whenever a prefix-TLV is received, as part of any Ext Prefix LSA, it
> needs to check for any modifications from the previous LSA. If none, it
> will ignore that prefix-TLV. Else it will be updated. In this way, even
> if a particular prefix-TLV is sent multiple times , and the latest one
> is considered as per the age of LSA, it will have no impact internally
> on the routes corresponding to that Prefix. Also it will significantly
> reduce the Link State Database to be maintained, and it will always be
> one per router. Any new prefix TLV in the new LSA will be added, and if
> any prefix TLV previously advertised is missing, will be removed.
>

none of the above needs to be standardized. Base OSPF spec specifies 
that newer version of LSA replaces the old one. The way you deal with it 
is up to you. The only requirement is that you only use info that is in 
the latest version of the LSA.

> ii) The Ext Prefix LSA can allow only a single Top Level TLV per LSA.

no, we want to have the flexibility in packing the single or multiple 
TLVs in the Ext Prefix LSA.

regards,
Peter



> Here announcing new Prefix and its withdraw can happen individually and
> will be a much simpler approach. This is similar to approach followed in
> OSPF TE (https://tools.ietf.org/html/rfc3630#section-2.4)
>
> Regards
> Santanu
>
> On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <ppsenak@cisco.com
> <mailto:ppsenak@cisco.com>> wrote:
>
>     Hi Santanu,
>
>     On 3/25/15 14:08 , Santanu Kar wrote:
>
>         Hi Authors
>
>         The Section 2, doesn't provide any clarification on the
>         'Instance' part
>         of the Link ID of
>         OSPFv2 Extended Prefix Opaque LSA.
>
>
>     Instance is an arbitrary number to make each OSPFv2 Extended Prefix
>     Opaque LSA's LSID unique, please see RFC5250, section abut Opaque-ID.
>
>
>         There can be two possible implementations
>
>         1) When a Segment routing enabled router is advertising multiple Ext
>         Prefix TLV, it can keep repacking it into a single Ext Prefix
>         LSA, as
>         has been mentioned in end of section 2 and keep increasing the
>         instance
>         . The lowest instance is taken. Higher instance from same router for
>         same prefix is ignored.
>
>
>     above only applies to the case where OSPFv2 Extended Prefix TLV is
>     advertised for the _same_ prefix in multiple different OSPFv2
>     Extended Prefix Opaque LSAs, which is either an error or temporary
>     condition.
>
>
>
>         2) Another possible way is, not to go for this repacking. Instead it
>         should be possible to originate separate Ext Prefix LSAs for
>         every Ext
>         Prefix TLV, and only one TLV per LSA. The instance number or
>         Opaque id
>         can be derived from the prefix/interface so as to ensure its
>         unique for
>         every prefix originating from the same advertising router.
>
>
>     yes above is correct, but the draft allows to pack multiple Ext
>     Prefix TLVs in the single Extended Prefix Opaquer LSA if the
>     implementation prefers to do so.
>
>
>         The draft is not clear on whether (2) can be allowed. It hasn't
>
>
>     the draft says:
>
>     Multiple OSPF Extended Prefix TLVs MAY be advertised in each OSPFv2
>     Extended Prefix Opaque LSA."
>
>     That means it can be one or more.
>
>
>         mentioned that the instance is topology independent and
>         dependent on how
>         we choose to implement it. The TE RFC however has a section
>         devoted to this
>         https://tools.ietf.org/html/__rfc3630#section-2.2
>         <https://tools.ietf.org/html/rfc3630#section-2.2>
>
>
>     I can add a similar text to draft-ietf-ospf-prefix-link-__attr.
>
>
>     thanks,
>     Peter
>
>
>
>         Please give your thoughts on this.
>
>         Regards
>         Santanu
>
>
>
>
>
>
> --
> Best Regards
> Santanu Kar
> ----------------------------------------------------------------------------------------------
> When you really want something to happen, the whole universe
> conspires so that your wish comes true
> ----------------------------------------------------------------------------------------------


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From: Santanu Kar <santanu.kar2000@gmail.com>
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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Hi Peter

Yeah, I understand that for updates of Ext Prefix LSA (when we are
adding/modifying/deleting Prefix TLVs) if we keep the Link ID (Type number,
Opaque ID/Instance) same, then by general OSPF rules we will take only the
latest LSA , and scenarios mentioned above will work perfectly. When the
link ID remains same, the working is very similar to the router LSA.

My only concern is on the text which talks about different instances of Ext
Prefix LSA from same router.


If this TLV is advertised multiple times for the same prefix in
   different OSPFv2 Extended Prefix Opaque LSAs originated by the same
   OSPF router, the OSPF advertising router is re-originating Extended
   Prefix Opaque LSAs for multiple prefixes and is most likely repacking
   Extended-Prefix-TLVs in Extended Prefix Opaque LSAs.  In this case,
   the Extended-Prefix-TLV in the Extended Prefix Opaque LSA with the
   smallest Instance is used by receiving OSPFv2 Routers.  This
   situation MAY be logged as a warning.

What are the conditions on which a router will generate different
instances (in effect different link IDs) of Ext Prefix LSA?

So if there are say 5 prefix TLVs to send, the router can choose to send
i) All in one LSA, or
ii)Send 2 TLVs in one instance and 3 in other, or may be even

iii) 5 LSAs each having one TLV  ?


Regards

Santanu



On Mon, Mar 30, 2015 at 1:33 PM, Peter Psenak <ppsenak@cisco.com> wrote:

> Santanu,
>
> On 3/30/15 09:07 , Santanu Kar wrote:
>
>>
>> Hi Peter
>>
>> Thanks for the clarification.
>>
>> I still do not completely agree that scenario (1) is a 'error or
>> temporary condition'.
>>
>> Scenario A: Lets consider we have a network of routers and each router
>> has 48 ports and OSPF routing enabled on all. We want to replace LDP in
>> the network and have Prefix Segment based label  mappings for all
>> prefixes in the network. So while configuring for the first time, each
>> prefix with a prefix SID one by one, OSPF will send out 48 Ext Prefix
>> LSAs. The first one will have only one Prefix TLV, the next one two, and
>>
>
> more specifically, it will send 48 instances if the same LSA.
>
>  subsequent ones keep adding the additional Prefix TLVs and repacking
>> into the LSA. All the LSAs will keep having incremental instance. So the
>> first prefix is advertised 48 times by the same router in different Ext
>> Prefix LSAs.
>>
>
>
> yes, what is wrong with the above? The exact same thing happens with
> Router LSA today. If you do not like it, your implementation can generate a
> dedicated Ext. Prefix LSA for each prefix. Both ways are allowed. But your
> implementation MUST be able to deal with the received Ext. Prefix LSAs that
> have multiple Ext Prefix TLVs.
>
>
>> There are few more scenarios that needs to be considered for
>> Multiple-Prefix TLV .Consider the following.
>> Scenario B: Withdrawing of Prefix TLV. If on a particular router the
>> prefix SID configured for one of its prefixes is unconfigured, the
>> router needs to withdraw that specific Prefix TLV from the OSPF network.
>> If this Prefix TLV was part of one or more LSA as described in scenario
>>
>
> each prefix should be only advertised in a single Ext Prefix LSA...
>
>
>  A, then all such LSAs needs to be withdrawn by issuing a LSA of MaxAge.
>> Also since each LSA has multiple Prefix TLVs , all other Prefix-TLVs in
>> that LSA will also get effected. This is undesirable. Even if there is
>> no duplicate prefix TLVs across LSAs, this problem is applicable for the
>> LSA which is withdrawn.
>>
>
> what you described above is incorrect. When Ext Prefix LSA has multiple
> Ext Prefix TLVs and you want to remove one of them, you simply regenerate
> the Ext Prefix LSA without the Ext Prefix TLV that corresponds to that
> prefix and keep the rest of the Ext Prefix TLVs in the LSA - these prefixes
> are NOT affected.
>
>
>> I propose the following solutions for this problem.
>> i) The Ext Prefix LSA can have a fixed instance number associated with
>>
>
> above is by definition - Instance (or Opaque-ID), is part of the LSID,
> which together with the Adv-Rtr-ID uniquely identifies the LSA itself.
>
>  it. Whenever a prefix-TLV is received, as part of any Ext Prefix LSA, it
>> needs to check for any modifications from the previous LSA. If none, it
>> will ignore that prefix-TLV. Else it will be updated. In this way, even
>> if a particular prefix-TLV is sent multiple times , and the latest one
>> is considered as per the age of LSA, it will have no impact internally
>> on the routes corresponding to that Prefix. Also it will significantly
>> reduce the Link State Database to be maintained, and it will always be
>> one per router. Any new prefix TLV in the new LSA will be added, and if
>> any prefix TLV previously advertised is missing, will be removed.
>>
>>
> none of the above needs to be standardized. Base OSPF spec specifies that
> newer version of LSA replaces the old one. The way you deal with it is up
> to you. The only requirement is that you only use info that is in the
> latest version of the LSA.
>
>  ii) The Ext Prefix LSA can allow only a single Top Level TLV per LSA.
>>
>
> no, we want to have the flexibility in packing the single or multiple TLVs
> in the Ext Prefix LSA.
>
> regards,
> Peter
>
>
>
>  Here announcing new Prefix and its withdraw can happen individually and
>> will be a much simpler approach. This is similar to approach followed in
>> OSPF TE (https://tools.ietf.org/html/rfc3630#section-2.4)
>>
>> Regards
>> Santanu
>>
>> On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <ppsenak@cisco.com
>> <mailto:ppsenak@cisco.com>> wrote:
>>
>>     Hi Santanu,
>>
>>     On 3/25/15 14:08 , Santanu Kar wrote:
>>
>>         Hi Authors
>>
>>         The Section 2, doesn't provide any clarification on the
>>         'Instance' part
>>         of the Link ID of
>>         OSPFv2 Extended Prefix Opaque LSA.
>>
>>
>>     Instance is an arbitrary number to make each OSPFv2 Extended Prefix
>>     Opaque LSA's LSID unique, please see RFC5250, section abut Opaque-ID.
>>
>>
>>         There can be two possible implementations
>>
>>         1) When a Segment routing enabled router is advertising multiple
>> Ext
>>         Prefix TLV, it can keep repacking it into a single Ext Prefix
>>         LSA, as
>>         has been mentioned in end of section 2 and keep increasing the
>>         instance
>>         . The lowest instance is taken. Higher instance from same router
>> for
>>         same prefix is ignored.
>>
>>
>>     above only applies to the case where OSPFv2 Extended Prefix TLV is
>>     advertised for the _same_ prefix in multiple different OSPFv2
>>     Extended Prefix Opaque LSAs, which is either an error or temporary
>>     condition.
>>
>>
>>
>>         2) Another possible way is, not to go for this repacking. Instead
>> it
>>         should be possible to originate separate Ext Prefix LSAs for
>>         every Ext
>>         Prefix TLV, and only one TLV per LSA. The instance number or
>>         Opaque id
>>         can be derived from the prefix/interface so as to ensure its
>>         unique for
>>         every prefix originating from the same advertising router.
>>
>>
>>     yes above is correct, but the draft allows to pack multiple Ext
>>     Prefix TLVs in the single Extended Prefix Opaquer LSA if the
>>     implementation prefers to do so.
>>
>>
>>         The draft is not clear on whether (2) can be allowed. It hasn't
>>
>>
>>     the draft says:
>>
>>     Multiple OSPF Extended Prefix TLVs MAY be advertised in each OSPFv2
>>     Extended Prefix Opaque LSA."
>>
>>     That means it can be one or more.
>>
>>
>>         mentioned that the instance is topology independent and
>>         dependent on how
>>         we choose to implement it. The TE RFC however has a section
>>         devoted to this
>>         https://tools.ietf.org/html/__rfc3630#section-2.2
>>         <https://tools.ietf.org/html/rfc3630#section-2.2>
>>
>>
>>     I can add a similar text to draft-ietf-ospf-prefix-link-__attr.
>>
>>
>>     thanks,
>>     Peter
>>
>>
>>
>>         Please give your thoughts on this.
>>
>>         Regards
>>         Santanu
>>
>>
>>
>>
>>
>>
>> --
>> Best Regards
>> Santanu Kar
>> ------------------------------------------------------------
>> ----------------------------------
>> When you really want something to happen, the whole universe
>> conspires so that your wish comes true
>> ------------------------------------------------------------
>> ----------------------------------
>>
>
>


-- 
Best Regards
Santanu Kar
----------------------------------------------------------------------------------------------
When you really want something to happen, the whole universe
conspires so that your wish comes true
----------------------------------------------------------------------------------------------

--90e6ba6e83c4cee7db051281cff1
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div>Hi Peter<br><br></div>Yeah, I understand that fo=
r updates of Ext Prefix LSA (when we are adding/modifying/deleting Prefix T=
LVs) if we keep the Link ID (Type number, Opaque ID/Instance) same, then by=
 general OSPF rules we will take only the latest LSA , and scenarios mentio=
ned above will work perfectly. When the link ID remains same, the working i=
s very similar to the router LSA. <br><br></div>My only concern is on the t=
ext which talks about different instances of Ext Prefix LSA from same route=
r.<br><pre class=3D"" style=3D"font-size:1em;margin-top:0px;margin-bottom:0=
px;color:rgb(0,0,0);font-style:normal;font-variant:normal;font-weight:norma=
l;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px=
;text-transform:none;word-spacing:0px"><br>If this TLV is advertised multip=
le times for the same prefix in
   different OSPFv2 Extended Prefix Opaque LSAs originated by the same
   OSPF router, the OSPF advertising router is re-originating Extended
   Prefix Opaque LSAs for multiple prefixes and is most likely repacking
   Extended-Prefix-TLVs in Extended Prefix Opaque LSAs.  In this case,
   the Extended-Prefix-TLV in the Extended Prefix Opaque LSA with the
   smallest Instance is used by receiving OSPFv2 Routers.  This
   situation MAY be logged as a warning.<br><br></pre><pre class=3D"" style=
=3D"font-size:1em;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-st=
yle:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;lin=
e-height:normal;text-align:start;text-indent:0px;text-transform:none;word-s=
pacing:0px">What are the conditions on which a router will generate differe=
nt instances (in effect different link IDs) of Ext Prefix LSA?<br></pre><pr=
e class=3D"" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;color:=
rgb(0,0,0);font-style:normal;font-variant:normal;font-weight:normal;letter-=
spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-tra=
nsform:none;word-spacing:0px">So if there are say 5 prefix TLVs to send, th=
e router can choose to send<br>i) All in one LSA, or <br>ii)Send 2 TLVs in =
one instance and 3 in other, or may be even<br></pre><pre class=3D"" style=
=3D"font-size:1em;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-st=
yle:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;lin=
e-height:normal;text-align:start;text-indent:0px;text-transform:none;word-s=
pacing:0px">iii) 5 LSAs each having one TLV  ?<br><br></pre><pre class=3D""=
 style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);f=
ont-style:normal;font-variant:normal;font-weight:normal;letter-spacing:norm=
al;line-height:normal;text-align:start;text-indent:0px;text-transform:none;=
word-spacing:0px"><br></pre><pre class=3D"" style=3D"font-size:1em;margin-t=
op:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-variant:no=
rmal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align=
:start;text-indent:0px;text-transform:none;word-spacing:0px">Regards<br></p=
re><pre class=3D"" style=3D"font-size:1em;margin-top:0px;margin-bottom:0px;=
color:rgb(0,0,0);font-style:normal;font-variant:normal;font-weight:normal;l=
etter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;te=
xt-transform:none;word-spacing:0px">Santanu<br></pre><br></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Mar 30, 2015 at 1:3=
3 PM, Peter Psenak <span dir=3D"ltr">&lt;<a href=3D"mailto:ppsenak@cisco.co=
m" target=3D"_blank">ppsenak@cisco.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">Santanu,<span class=3D""><br>
<br>
On 3/30/15 09:07 , Santanu Kar wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
Hi Peter<br>
<br>
Thanks for the clarification.<br>
<br>
I still do not completely agree that scenario (1) is a &#39;error or<br>
temporary condition&#39;.<br>
<br>
Scenario A: Lets consider we have a network of routers and each router<br>
has 48 ports and OSPF routing enabled on all. We want to replace LDP in<br>
the network and have Prefix Segment based label=C2=A0 mappings for all<br>
prefixes in the network. So while configuring for the first time, each<br>
prefix with a prefix SID one by one, OSPF will send out 48 Ext Prefix<br>
LSAs. The first one will have only one Prefix TLV, the next one two, and<br=
>
</blockquote>
<br></span>
more specifically, it will send 48 instances if the same LSA.<span class=3D=
""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
subsequent ones keep adding the additional Prefix TLVs and repacking<br>
into the LSA. All the LSAs will keep having incremental instance. So the<br=
>
first prefix is advertised 48 times by the same router in different Ext<br>
Prefix LSAs.<br>
</blockquote>
<br>
<br></span>
yes, what is wrong with the above? The exact same thing happens with Router=
 LSA today. If you do not like it, your implementation can generate a dedic=
ated Ext. Prefix LSA for each prefix. Both ways are allowed. But your imple=
mentation MUST be able to deal with the received Ext. Prefix LSAs that have=
 multiple Ext Prefix TLVs.<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
There are few more scenarios that needs to be considered for<br>
Multiple-Prefix TLV .Consider the following.<br>
Scenario B: Withdrawing of Prefix TLV. If on a particular router the<br>
prefix SID configured for one of its prefixes is unconfigured, the<br>
router needs to withdraw that specific Prefix TLV from the OSPF network.<br=
>
If this Prefix TLV was part of one or more LSA as described in scenario<br>
</blockquote>
<br></span>
each prefix should be only advertised in a single Ext Prefix LSA...<span cl=
ass=3D""><br>
<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
A, then all such LSAs needs to be withdrawn by issuing a LSA of MaxAge.<br>
Also since each LSA has multiple Prefix TLVs , all other Prefix-TLVs in<br>
that LSA will also get effected. This is undesirable. Even if there is<br>
no duplicate prefix TLVs across LSAs, this problem is applicable for the<br=
>
LSA which is withdrawn.<br>
</blockquote>
<br></span>
what you described above is incorrect. When Ext Prefix LSA has multiple Ext=
 Prefix TLVs and you want to remove one of them, you simply regenerate the =
Ext Prefix LSA without the Ext Prefix TLV that corresponds to that prefix a=
nd keep the rest of the Ext Prefix TLVs in the LSA - these prefixes are NOT=
 affected.<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<br>
I propose the following solutions for this problem.<br>
i) The Ext Prefix LSA can have a fixed instance number associated with<br>
</blockquote>
<br></span>
above is by definition - Instance (or Opaque-ID), is part of the LSID, whic=
h together with the Adv-Rtr-ID uniquely identifies the LSA itself.<span cla=
ss=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
it. Whenever a prefix-TLV is received, as part of any Ext Prefix LSA, it<br=
>
needs to check for any modifications from the previous LSA. If none, it<br>
will ignore that prefix-TLV. Else it will be updated. In this way, even<br>
if a particular prefix-TLV is sent multiple times , and the latest one<br>
is considered as per the age of LSA, it will have no impact internally<br>
on the routes corresponding to that Prefix. Also it will significantly<br>
reduce the Link State Database to be maintained, and it will always be<br>
one per router. Any new prefix TLV in the new LSA will be added, and if<br>
any prefix TLV previously advertised is missing, will be removed.<br>
<br>
</blockquote>
<br></span>
none of the above needs to be standardized. Base OSPF spec specifies that n=
ewer version of LSA replaces the old one. The way you deal with it is up to=
 you. The only requirement is that you only use info that is in the latest =
version of the LSA.<span class=3D""><br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
ii) The Ext Prefix LSA can allow only a single Top Level TLV per LSA.<br>
</blockquote>
<br></span>
no, we want to have the flexibility in packing the single or multiple TLVs =
in the Ext Prefix LSA.<br>
<br>
regards,<br>
Peter<br>
<br>
<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><span class=3D"">
Here announcing new Prefix and its withdraw can happen individually and<br>
will be a much simpler approach. This is similar to approach followed in<br=
>
OSPF TE (<a href=3D"https://tools.ietf.org/html/rfc3630#section-2.4" target=
=3D"_blank">https://tools.ietf.org/html/<u></u>rfc3630#section-2.4</a>)<br>
<br>
Regards<br>
Santanu<br>
<br>
On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak &lt;<a href=3D"mailto:ppsenak=
@cisco.com" target=3D"_blank">ppsenak@cisco.com</a><br></span><div><div cla=
ss=3D"h5">
&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@c=
isco.com</a>&gt;&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Hi Santanu,<br>
<br>
=C2=A0 =C2=A0 On 3/25/15 14:08 , Santanu Kar wrote:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Authors<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 The Section 2, doesn&#39;t provide any clarific=
ation on the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &#39;Instance&#39; part<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 of the Link ID of<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 OSPFv2 Extended Prefix Opaque LSA.<br>
<br>
<br>
=C2=A0 =C2=A0 Instance is an arbitrary number to make each OSPFv2 Extended =
Prefix<br>
=C2=A0 =C2=A0 Opaque LSA&#39;s LSID unique, please see RFC5250, section abu=
t Opaque-ID.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 There can be two possible implementations<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 1) When a Segment routing enabled router is adv=
ertising multiple Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix TLV, it can keep repacking it into a sin=
gle Ext Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA, as<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 has been mentioned in end of section 2 and keep=
 increasing the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 instance<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 . The lowest instance is taken. Higher instance=
 from same router for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 same prefix is ignored.<br>
<br>
<br>
=C2=A0 =C2=A0 above only applies to the case where OSPFv2 Extended Prefix T=
LV is<br>
=C2=A0 =C2=A0 advertised for the _same_ prefix in multiple different OSPFv2=
<br>
=C2=A0 =C2=A0 Extended Prefix Opaque LSAs, which is either an error or temp=
orary<br>
=C2=A0 =C2=A0 condition.<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 2) Another possible way is, not to go for this =
repacking. Instead it<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 should be possible to originate separate Ext Pr=
efix LSAs for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 every Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix TLV, and only one TLV per LSA. The insta=
nce number or<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Opaque id<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 can be derived from the prefix/interface so as =
to ensure its<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 unique for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 every prefix originating from the same advertis=
ing router.<br>
<br>
<br>
=C2=A0 =C2=A0 yes above is correct, but the draft allows to pack multiple E=
xt<br>
=C2=A0 =C2=A0 Prefix TLVs in the single Extended Prefix Opaquer LSA if the<=
br>
=C2=A0 =C2=A0 implementation prefers to do so.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 The draft is not clear on whether (2) can be al=
lowed. It hasn&#39;t<br>
<br>
<br>
=C2=A0 =C2=A0 the draft says:<br>
<br>
=C2=A0 =C2=A0 Multiple OSPF Extended Prefix TLVs MAY be advertised in each =
OSPFv2<br>
=C2=A0 =C2=A0 Extended Prefix Opaque LSA.&quot;<br>
<br>
=C2=A0 =C2=A0 That means it can be one or more.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 mentioned that the instance is topology indepen=
dent and<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 dependent on how<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 we choose to implement it. The TE RFC however h=
as a section<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 devoted to this<br></div></div>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://tools.ietf.org/html/__rfc363=
0#section-2.2" target=3D"_blank">https://tools.ietf.org/html/__<u></u>rfc36=
30#section-2.2</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;<a href=3D"https://tools.ietf.org/html/rfc3=
630#section-2.2" target=3D"_blank">https://tools.ietf.org/html/<u></u>rfc36=
30#section-2.2</a>&gt;<br>
<br>
<br>
=C2=A0 =C2=A0 I can add a similar text to draft-ietf-ospf-prefix-link-__<u>=
</u>attr.<span class=3D""><br>
<br>
<br>
=C2=A0 =C2=A0 thanks,<br>
=C2=A0 =C2=A0 Peter<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Please give your thoughts on this.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Santanu<br>
<br>
<br>
<br>
<br>
<br>
<br>
--<br>
Best Regards<br>
Santanu Kar<br>
------------------------------<u></u>------------------------------<u></u>-=
-----------------------------<u></u>----<br>
When you really want something to happen, the whole universe<br>
conspires so that your wish comes true<br>
------------------------------<u></u>------------------------------<u></u>-=
-----------------------------<u></u>----<br>
</span></blockquote>
<br>
</blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail_sig=
nature">Best Regards<br>Santanu Kar<br>------------------------------------=
----------------------------------------------------------<br>When you real=
ly want something to happen, the whole universe <br>conspires so that your =
wish comes true<br>--------------------------------------------------------=
--------------------------------------</div>
</div>

--90e6ba6e83c4cee7db051281cff1--


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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Santanu,

On 3/30/15 15:53 , Santanu Kar wrote:
> Hi Peter
>
> Yeah, I understand that for updates of Ext Prefix LSA (when we are
> adding/modifying/deleting Prefix TLVs) if we keep the Link ID (Type
> number, Opaque ID/Instance) same, then by general OSPF rules we will
> take only the latest LSA , and scenarios mentioned above will work
> perfectly. When the link ID remains same, the working is very similar to
> the router LSA.
>
> My only concern is on the text which talks about different instances of
> Ext Prefix LSA from same router.
>
>
> If this TLV is advertised multiple times for the same prefix in
>     different OSPFv2 Extended Prefix Opaque LSAs originated by the same
>     OSPF router, the OSPF advertising router is re-originating Extended
>     Prefix Opaque LSAs for multiple prefixes and is most likely repacking
>     Extended-Prefix-TLVs in Extended Prefix Opaque LSAs.  In this case,
>     the Extended-Prefix-TLV in the Extended Prefix Opaque LSA with the
>     smallest Instance is used by receiving OSPFv2 Routers.  This
>     situation MAY be logged as a warning.
>
> What are the conditions on which a router will generate different instances (in effect different link IDs) of Ext Prefix LSA?
>
> So if there are say 5 prefix TLVs to send, the router can choose to send
> i) All in one LSA, or
> ii)Send 2 TLVs in one instance and 3 in other, or may be even
>
> iii) 5 LSAs each having one TLV  ?

any combination is allowed. Each prefix should only be present in a 
single LSA.

Temporarily, during repacking, same prefix may be present in multiple 
LSA, in which case the above paragraph applies.

thanks,
Peter
>
>
> Regards
>
> Santanu
>
>
>
> On Mon, Mar 30, 2015 at 1:33 PM, Peter Psenak <ppsenak@cisco.com
> <mailto:ppsenak@cisco.com>> wrote:
>
>     Santanu,
>
>     On 3/30/15 09:07 , Santanu Kar wrote:
>
>
>         Hi Peter
>
>         Thanks for the clarification.
>
>         I still do not completely agree that scenario (1) is a 'error or
>         temporary condition'.
>
>         Scenario A: Lets consider we have a network of routers and each
>         router
>         has 48 ports and OSPF routing enabled on all. We want to replace
>         LDP in
>         the network and have Prefix Segment based label  mappings for all
>         prefixes in the network. So while configuring for the first
>         time, each
>         prefix with a prefix SID one by one, OSPF will send out 48 Ext
>         Prefix
>         LSAs. The first one will have only one Prefix TLV, the next one
>         two, and
>
>
>     more specifically, it will send 48 instances if the same LSA.
>
>         subsequent ones keep adding the additional Prefix TLVs and repacking
>         into the LSA. All the LSAs will keep having incremental
>         instance. So the
>         first prefix is advertised 48 times by the same router in
>         different Ext
>         Prefix LSAs.
>
>
>
>     yes, what is wrong with the above? The exact same thing happens with
>     Router LSA today. If you do not like it, your implementation can
>     generate a dedicated Ext. Prefix LSA for each prefix. Both ways are
>     allowed. But your implementation MUST be able to deal with the
>     received Ext. Prefix LSAs that have multiple Ext Prefix TLVs.
>
>
>         There are few more scenarios that needs to be considered for
>         Multiple-Prefix TLV .Consider the following.
>         Scenario B: Withdrawing of Prefix TLV. If on a particular router the
>         prefix SID configured for one of its prefixes is unconfigured, the
>         router needs to withdraw that specific Prefix TLV from the OSPF
>         network.
>         If this Prefix TLV was part of one or more LSA as described in
>         scenario
>
>
>     each prefix should be only advertised in a single Ext Prefix LSA...
>
>
>         A, then all such LSAs needs to be withdrawn by issuing a LSA of
>         MaxAge.
>         Also since each LSA has multiple Prefix TLVs , all other
>         Prefix-TLVs in
>         that LSA will also get effected. This is undesirable. Even if
>         there is
>         no duplicate prefix TLVs across LSAs, this problem is applicable
>         for the
>         LSA which is withdrawn.
>
>
>     what you described above is incorrect. When Ext Prefix LSA has
>     multiple Ext Prefix TLVs and you want to remove one of them, you
>     simply regenerate the Ext Prefix LSA without the Ext Prefix TLV that
>     corresponds to that prefix and keep the rest of the Ext Prefix TLVs
>     in the LSA - these prefixes are NOT affected.
>
>
>         I propose the following solutions for this problem.
>         i) The Ext Prefix LSA can have a fixed instance number
>         associated with
>
>
>     above is by definition - Instance (or Opaque-ID), is part of the
>     LSID, which together with the Adv-Rtr-ID uniquely identifies the LSA
>     itself.
>
>         it. Whenever a prefix-TLV is received, as part of any Ext Prefix
>         LSA, it
>         needs to check for any modifications from the previous LSA. If
>         none, it
>         will ignore that prefix-TLV. Else it will be updated. In this
>         way, even
>         if a particular prefix-TLV is sent multiple times , and the
>         latest one
>         is considered as per the age of LSA, it will have no impact
>         internally
>         on the routes corresponding to that Prefix. Also it will
>         significantly
>         reduce the Link State Database to be maintained, and it will
>         always be
>         one per router. Any new prefix TLV in the new LSA will be added,
>         and if
>         any prefix TLV previously advertised is missing, will be removed.
>
>
>     none of the above needs to be standardized. Base OSPF spec specifies
>     that newer version of LSA replaces the old one. The way you deal
>     with it is up to you. The only requirement is that you only use info
>     that is in the latest version of the LSA.
>
>         ii) The Ext Prefix LSA can allow only a single Top Level TLV per
>         LSA.
>
>
>     no, we want to have the flexibility in packing the single or
>     multiple TLVs in the Ext Prefix LSA.
>
>     regards,
>     Peter
>
>
>
>         Here announcing new Prefix and its withdraw can happen
>         individually and
>         will be a much simpler approach. This is similar to approach
>         followed in
>         OSPF TE (https://tools.ietf.org/html/__rfc3630#section-2.4
>         <https://tools.ietf.org/html/rfc3630#section-2.4>)
>
>         Regards
>         Santanu
>
>         On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <ppsenak@cisco.com
>         <mailto:ppsenak@cisco.com>
>         <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:
>
>              Hi Santanu,
>
>              On 3/25/15 14:08 , Santanu Kar wrote:
>
>                  Hi Authors
>
>                  The Section 2, doesn't provide any clarification on the
>                  'Instance' part
>                  of the Link ID of
>                  OSPFv2 Extended Prefix Opaque LSA.
>
>
>              Instance is an arbitrary number to make each OSPFv2
>         Extended Prefix
>              Opaque LSA's LSID unique, please see RFC5250, section abut
>         Opaque-ID.
>
>
>                  There can be two possible implementations
>
>                  1) When a Segment routing enabled router is advertising
>         multiple Ext
>                  Prefix TLV, it can keep repacking it into a single Ext
>         Prefix
>                  LSA, as
>                  has been mentioned in end of section 2 and keep
>         increasing the
>                  instance
>                  . The lowest instance is taken. Higher instance from
>         same router for
>                  same prefix is ignored.
>
>
>              above only applies to the case where OSPFv2 Extended Prefix
>         TLV is
>              advertised for the _same_ prefix in multiple different OSPFv2
>              Extended Prefix Opaque LSAs, which is either an error or
>         temporary
>              condition.
>
>
>
>                  2) Another possible way is, not to go for this
>         repacking. Instead it
>                  should be possible to originate separate Ext Prefix
>         LSAs for
>                  every Ext
>                  Prefix TLV, and only one TLV per LSA. The instance
>         number or
>                  Opaque id
>                  can be derived from the prefix/interface so as to
>         ensure its
>                  unique for
>                  every prefix originating from the same advertising router.
>
>
>              yes above is correct, but the draft allows to pack multiple Ext
>              Prefix TLVs in the single Extended Prefix Opaquer LSA if the
>              implementation prefers to do so.
>
>
>                  The draft is not clear on whether (2) can be allowed.
>         It hasn't
>
>
>              the draft says:
>
>              Multiple OSPF Extended Prefix TLVs MAY be advertised in
>         each OSPFv2
>              Extended Prefix Opaque LSA."
>
>              That means it can be one or more.
>
>
>                  mentioned that the instance is topology independent and
>                  dependent on how
>                  we choose to implement it. The TE RFC however has a section
>                  devoted to this
>         https://tools.ietf.org/html/____rfc3630#section-2.2
>         <https://tools.ietf.org/html/__rfc3630#section-2.2>
>                  <https://tools.ietf.org/html/__rfc3630#section-2.2
>         <https://tools.ietf.org/html/rfc3630#section-2.2>>
>
>
>              I can add a similar text to
>         draft-ietf-ospf-prefix-link-____attr.
>
>
>              thanks,
>              Peter
>
>
>
>                  Please give your thoughts on this.
>
>                  Regards
>                  Santanu
>
>
>
>
>
>
>         --
>         Best Regards
>         Santanu Kar
>         ------------------------------__------------------------------__------------------------------__----
>         When you really want something to happen, the whole universe
>         conspires so that your wish comes true
>         ------------------------------__------------------------------__------------------------------__----
>
>
>
>
>
> --
> Best Regards
> Santanu Kar
> ----------------------------------------------------------------------------------------------
> When you really want something to happen, the whole universe
> conspires so that your wish comes true
> ----------------------------------------------------------------------------------------------


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Please see the URL for the SPRING WG minutes. Thanks to Rob Shakir for taki=
ng them.



http://www.ietf.org/proceedings/92/minutes/minutes-92-spring



Thanks,

Bruno


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<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Bruno<o:p></o:p></span></p>
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Thanks for getting out your minutes quickly.

Alia

On Mon, Mar 30, 2015 at 10:39 AM, <bruno.decraene@orange.com> wrote:

>  Please see the URL for the SPRING WG minutes. Thanks to Rob Shakir for
> taking them.
>
>
>
> http://www.ietf.org/proceedings/92/minutes/minutes-92-spring
>
>
>
> Thanks,
>
> Bruno
>
>
>
> _________________________________________________________________________________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
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<div dir=3D"ltr">Thanks for getting out your minutes quickly.<div><br></div=
><div>Alia</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_qu=
ote">On Mon, Mar 30, 2015 at 10:39 AM,  <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.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"FR" link=3D"blue" vlink=3D"purple">
<div>
<p><span lang=3D"EN-US">Please see the URL for the SPRING WG minutes. Thank=
s to Rob Shakir for taking them.<u></u><u></u></span></p>
<p><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p><span lang=3D"EN-US"><a href=3D"http://www.ietf.org/proceedings/92/minut=
es/minutes-92-spring" target=3D"_blank">http://www.ietf.org/proceedings/92/=
minutes/minutes-92-spring</a><u></u><u></u></span></p>
<p><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p><span lang=3D"EN-US">Thanks,<u></u><u></u></span></p>
<p><span lang=3D"EN-US">Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
</div>
<pre>______________________________________________________________________=
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</pre></div>

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Date: Tue, 31 Mar 2015 08:41:59 +0530
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Subject: Re: [spring] Clarification on Instance in draft-ietf-ospf-prefix-link-attr-03.txt
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Hi Peter

Yeah, its quite clear now.
The Link ID is very essential to the Link State DB design. So I would
request you to add more clarifications on the text, and possibly have one
section on the Link ID , and highlight the various possible ways it can be
used. Currently the only text appearing on the link id is the different
instances scenario of repacking, which is somewhat misleading, regarding
the other ways which are also allowed .
As an implementation can choose to have a i)single link id or instance and
pack all TLVs within it or ii) optionally have different link ids and
distribute the TLVs among the instances, or iii) may even have one instance
for every TLV. The receiver should be able to handle all modes.

Regards
Santanu



On Mon, Mar 30, 2015 at 7:38 PM, Peter Psenak <ppsenak@cisco.com> wrote:

> Santanu,
>
> On 3/30/15 15:53 , Santanu Kar wrote:
>
>> Hi Peter
>>
>> Yeah, I understand that for updates of Ext Prefix LSA (when we are
>> adding/modifying/deleting Prefix TLVs) if we keep the Link ID (Type
>> number, Opaque ID/Instance) same, then by general OSPF rules we will
>> take only the latest LSA , and scenarios mentioned above will work
>> perfectly. When the link ID remains same, the working is very similar to
>> the router LSA.
>>
>> My only concern is on the text which talks about different instances of
>> Ext Prefix LSA from same router.
>>
>>
>> If this TLV is advertised multiple times for the same prefix in
>>     different OSPFv2 Extended Prefix Opaque LSAs originated by the same
>>     OSPF router, the OSPF advertising router is re-originating Extended
>>     Prefix Opaque LSAs for multiple prefixes and is most likely repacking
>>     Extended-Prefix-TLVs in Extended Prefix Opaque LSAs.  In this case,
>>     the Extended-Prefix-TLV in the Extended Prefix Opaque LSA with the
>>     smallest Instance is used by receiving OSPFv2 Routers.  This
>>     situation MAY be logged as a warning.
>>
>> What are the conditions on which a router will generate different
>> instances (in effect different link IDs) of Ext Prefix LSA?
>>
>> So if there are say 5 prefix TLVs to send, the router can choose to send
>> i) All in one LSA, or
>> ii)Send 2 TLVs in one instance and 3 in other, or may be even
>>
>> iii) 5 LSAs each having one TLV  ?
>>
>
> any combination is allowed. Each prefix should only be present in a single
> LSA.
>
> Temporarily, during repacking, same prefix may be present in multiple LSA,
> in which case the above paragraph applies.
>
> thanks,
> Peter
>
>>
>>
>> Regards
>>
>> Santanu
>>
>>
>>
>> On Mon, Mar 30, 2015 at 1:33 PM, Peter Psenak <ppsenak@cisco.com
>> <mailto:ppsenak@cisco.com>> wrote:
>>
>>     Santanu,
>>
>>     On 3/30/15 09:07 , Santanu Kar wrote:
>>
>>
>>         Hi Peter
>>
>>         Thanks for the clarification.
>>
>>         I still do not completely agree that scenario (1) is a 'error or
>>         temporary condition'.
>>
>>         Scenario A: Lets consider we have a network of routers and each
>>         router
>>         has 48 ports and OSPF routing enabled on all. We want to replace
>>         LDP in
>>         the network and have Prefix Segment based label  mappings for all
>>         prefixes in the network. So while configuring for the first
>>         time, each
>>         prefix with a prefix SID one by one, OSPF will send out 48 Ext
>>         Prefix
>>         LSAs. The first one will have only one Prefix TLV, the next one
>>         two, and
>>
>>
>>     more specifically, it will send 48 instances if the same LSA.
>>
>>         subsequent ones keep adding the additional Prefix TLVs and
>> repacking
>>         into the LSA. All the LSAs will keep having incremental
>>         instance. So the
>>         first prefix is advertised 48 times by the same router in
>>         different Ext
>>         Prefix LSAs.
>>
>>
>>
>>     yes, what is wrong with the above? The exact same thing happens with
>>     Router LSA today. If you do not like it, your implementation can
>>     generate a dedicated Ext. Prefix LSA for each prefix. Both ways are
>>     allowed. But your implementation MUST be able to deal with the
>>     received Ext. Prefix LSAs that have multiple Ext Prefix TLVs.
>>
>>
>>         There are few more scenarios that needs to be considered for
>>         Multiple-Prefix TLV .Consider the following.
>>         Scenario B: Withdrawing of Prefix TLV. If on a particular router
>> the
>>         prefix SID configured for one of its prefixes is unconfigured, the
>>         router needs to withdraw that specific Prefix TLV from the OSPF
>>         network.
>>         If this Prefix TLV was part of one or more LSA as described in
>>         scenario
>>
>>
>>     each prefix should be only advertised in a single Ext Prefix LSA...
>>
>>
>>         A, then all such LSAs needs to be withdrawn by issuing a LSA of
>>         MaxAge.
>>         Also since each LSA has multiple Prefix TLVs , all other
>>         Prefix-TLVs in
>>         that LSA will also get effected. This is undesirable. Even if
>>         there is
>>         no duplicate prefix TLVs across LSAs, this problem is applicable
>>         for the
>>         LSA which is withdrawn.
>>
>>
>>     what you described above is incorrect. When Ext Prefix LSA has
>>     multiple Ext Prefix TLVs and you want to remove one of them, you
>>     simply regenerate the Ext Prefix LSA without the Ext Prefix TLV that
>>     corresponds to that prefix and keep the rest of the Ext Prefix TLVs
>>     in the LSA - these prefixes are NOT affected.
>>
>>
>>         I propose the following solutions for this problem.
>>         i) The Ext Prefix LSA can have a fixed instance number
>>         associated with
>>
>>
>>     above is by definition - Instance (or Opaque-ID), is part of the
>>     LSID, which together with the Adv-Rtr-ID uniquely identifies the LSA
>>     itself.
>>
>>         it. Whenever a prefix-TLV is received, as part of any Ext Prefix
>>         LSA, it
>>         needs to check for any modifications from the previous LSA. If
>>         none, it
>>         will ignore that prefix-TLV. Else it will be updated. In this
>>         way, even
>>         if a particular prefix-TLV is sent multiple times , and the
>>         latest one
>>         is considered as per the age of LSA, it will have no impact
>>         internally
>>         on the routes corresponding to that Prefix. Also it will
>>         significantly
>>         reduce the Link State Database to be maintained, and it will
>>         always be
>>         one per router. Any new prefix TLV in the new LSA will be added,
>>         and if
>>         any prefix TLV previously advertised is missing, will be removed.
>>
>>
>>     none of the above needs to be standardized. Base OSPF spec specifies
>>     that newer version of LSA replaces the old one. The way you deal
>>     with it is up to you. The only requirement is that you only use info
>>     that is in the latest version of the LSA.
>>
>>         ii) The Ext Prefix LSA can allow only a single Top Level TLV per
>>         LSA.
>>
>>
>>     no, we want to have the flexibility in packing the single or
>>     multiple TLVs in the Ext Prefix LSA.
>>
>>     regards,
>>     Peter
>>
>>
>>
>>         Here announcing new Prefix and its withdraw can happen
>>         individually and
>>         will be a much simpler approach. This is similar to approach
>>         followed in
>>         OSPF TE (https://tools.ietf.org/html/__rfc3630#section-2.4
>>         <https://tools.ietf.org/html/rfc3630#section-2.4>)
>>
>>         Regards
>>         Santanu
>>
>>         On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak <ppsenak@cisco.com
>>         <mailto:ppsenak@cisco.com>
>>         <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:
>>
>>              Hi Santanu,
>>
>>              On 3/25/15 14:08 , Santanu Kar wrote:
>>
>>                  Hi Authors
>>
>>                  The Section 2, doesn't provide any clarification on the
>>                  'Instance' part
>>                  of the Link ID of
>>                  OSPFv2 Extended Prefix Opaque LSA.
>>
>>
>>              Instance is an arbitrary number to make each OSPFv2
>>         Extended Prefix
>>              Opaque LSA's LSID unique, please see RFC5250, section abut
>>         Opaque-ID.
>>
>>
>>                  There can be two possible implementations
>>
>>                  1) When a Segment routing enabled router is advertising
>>         multiple Ext
>>                  Prefix TLV, it can keep repacking it into a single Ext
>>         Prefix
>>                  LSA, as
>>                  has been mentioned in end of section 2 and keep
>>         increasing the
>>                  instance
>>                  . The lowest instance is taken. Higher instance from
>>         same router for
>>                  same prefix is ignored.
>>
>>
>>              above only applies to the case where OSPFv2 Extended Prefix
>>         TLV is
>>              advertised for the _same_ prefix in multiple different OSPFv2
>>              Extended Prefix Opaque LSAs, which is either an error or
>>         temporary
>>              condition.
>>
>>
>>
>>                  2) Another possible way is, not to go for this
>>         repacking. Instead it
>>                  should be possible to originate separate Ext Prefix
>>         LSAs for
>>                  every Ext
>>                  Prefix TLV, and only one TLV per LSA. The instance
>>         number or
>>                  Opaque id
>>                  can be derived from the prefix/interface so as to
>>         ensure its
>>                  unique for
>>                  every prefix originating from the same advertising
>> router.
>>
>>
>>              yes above is correct, but the draft allows to pack multiple
>> Ext
>>              Prefix TLVs in the single Extended Prefix Opaquer LSA if the
>>              implementation prefers to do so.
>>
>>
>>                  The draft is not clear on whether (2) can be allowed.
>>         It hasn't
>>
>>
>>              the draft says:
>>
>>              Multiple OSPF Extended Prefix TLVs MAY be advertised in
>>         each OSPFv2
>>              Extended Prefix Opaque LSA."
>>
>>              That means it can be one or more.
>>
>>
>>                  mentioned that the instance is topology independent and
>>                  dependent on how
>>                  we choose to implement it. The TE RFC however has a
>> section
>>                  devoted to this
>>         https://tools.ietf.org/html/____rfc3630#section-2.2
>>         <https://tools.ietf.org/html/__rfc3630#section-2.2>
>>                  <https://tools.ietf.org/html/__rfc3630#section-2.2
>>         <https://tools.ietf.org/html/rfc3630#section-2.2>>
>>
>>
>>              I can add a similar text to
>>         draft-ietf-ospf-prefix-link-____attr.
>>
>>
>>              thanks,
>>              Peter
>>
>>
>>
>>                  Please give your thoughts on this.
>>
>>                  Regards
>>                  Santanu
>>
>>
>>
>>
>>
>>
>>         --
>>         Best Regards
>>         Santanu Kar
>>         ------------------------------__----------------------------
>> --__------------------------------__----
>>         When you really want something to happen, the whole universe
>>         conspires so that your wish comes true
>>         ------------------------------__----------------------------
>> --__------------------------------__----
>>
>>
>>
>>
>>
>> --
>> Best Regards
>> Santanu Kar
>> ------------------------------------------------------------
>> ----------------------------------
>> When you really want something to happen, the whole universe
>> conspires so that your wish comes true
>> ------------------------------------------------------------
>> ----------------------------------
>>
>
>


-- 
Best Regards
Santanu Kar
----------------------------------------------------------------------------------------------
When you really want something to happen, the whole universe
conspires so that your wish comes true
----------------------------------------------------------------------------------------------

--001a1134056e45e6a505128cf600
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Peter<div><br></div><div>Yeah, its quite clear now.</di=
v><div>The Link ID is very essential to the Link State DB design. So I woul=
d request you to add more clarifications on the text, and possibly have one=
 section on the Link ID , and highlight the various possible ways it can be=
 used. Currently the only text appearing on the link id is the different in=
stances scenario of repacking, which is somewhat misleading, regarding the =
other ways which are also allowed .=C2=A0</div><div>As an implementation ca=
n choose to have a i)single link id or instance and pack all TLVs within it=
 or ii) optionally have different link ids and distribute the TLVs among th=
e instances, or iii) may even have one instance for every TLV. The receiver=
 should be able to handle all modes.</div><div><br></div><div>Regards</div>=
<div>Santanu</div><div><br></div><div><br></div></div><div class=3D"gmail_e=
xtra"><br><div class=3D"gmail_quote">On Mon, Mar 30, 2015 at 7:38 PM, Peter=
 Psenak <span dir=3D"ltr">&lt;<a href=3D"mailto:ppsenak@cisco.com" target=
=3D"_blank">ppsenak@cisco.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">Santanu,<span class=3D""><br>
<br>
On 3/30/15 15:53 , Santanu Kar wrote:<br>
</span><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex">
Hi Peter<br>
<br><span class=3D"">
Yeah, I understand that for updates of Ext Prefix LSA (when we are<br>
adding/modifying/deleting Prefix TLVs) if we keep the Link ID (Type<br>
number, Opaque ID/Instance) same, then by general OSPF rules we will<br>
take only the latest LSA , and scenarios mentioned above will work<br>
perfectly. When the link ID remains same, the working is very similar to<br=
>
the router LSA.<br>
<br>
My only concern is on the text which talks about different instances of<br>
Ext Prefix LSA from same router.<br>
<br>
<br>
If this TLV is advertised multiple times for the same prefix in<br>
=C2=A0 =C2=A0 different OSPFv2 Extended Prefix Opaque LSAs originated by th=
e same<br>
=C2=A0 =C2=A0 OSPF router, the OSPF advertising router is re-originating Ex=
tended<br>
=C2=A0 =C2=A0 Prefix Opaque LSAs for multiple prefixes and is most likely r=
epacking<br>
=C2=A0 =C2=A0 Extended-Prefix-TLVs in Extended Prefix Opaque LSAs.=C2=A0 In=
 this case,<br>
=C2=A0 =C2=A0 the Extended-Prefix-TLV in the Extended Prefix Opaque LSA wit=
h the<br>
=C2=A0 =C2=A0 smallest Instance is used by receiving OSPFv2 Routers.=C2=A0 =
This<br>
=C2=A0 =C2=A0 situation MAY be logged as a warning.<br>
<br>
What are the conditions on which a router will generate different instances=
 (in effect different link IDs) of Ext Prefix LSA?<br>
<br>
So if there are say 5 prefix TLVs to send, the router can choose to send<br=
>
i) All in one LSA, or<br>
ii)Send 2 TLVs in one instance and 3 in other, or may be even<br>
<br>
iii) 5 LSAs each having one TLV=C2=A0 ?<br>
</span></blockquote>
<br>
any combination is allowed. Each prefix should only be present in a single =
LSA.<br>
<br>
Temporarily, during repacking, same prefix may be present in multiple LSA, =
in which case the above paragraph applies.<br>
<br>
thanks,<br>
Peter<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><span class=3D"">
<br>
<br>
Regards<br>
<br>
Santanu<br>
<br>
<br>
<br>
On Mon, Mar 30, 2015 at 1:33 PM, Peter Psenak &lt;<a href=3D"mailto:ppsenak=
@cisco.com" target=3D"_blank">ppsenak@cisco.com</a><br></span><div><div cla=
ss=3D"h5">
&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@c=
isco.com</a>&gt;&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Santanu,<br>
<br>
=C2=A0 =C2=A0 On 3/30/15 09:07 , Santanu Kar wrote:<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Peter<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks for the clarification.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I still do not completely agree that scenario (=
1) is a &#39;error or<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 temporary condition&#39;.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Scenario A: Lets consider we have a network of =
routers and each<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 router<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 has 48 ports and OSPF routing enabled on all. W=
e want to replace<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LDP in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 the network and have Prefix Segment based label=
=C2=A0 mappings for all<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 prefixes in the network. So while configuring f=
or the first<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 time, each<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 prefix with a prefix SID one by one, OSPF will =
send out 48 Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSAs. The first one will have only one Prefix T=
LV, the next one<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 two, and<br>
<br>
<br>
=C2=A0 =C2=A0 more specifically, it will send 48 instances if the same LSA.=
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 subsequent ones keep adding the additional Pref=
ix TLVs and repacking<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 into the LSA. All the LSAs will keep having inc=
remental<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 instance. So the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 first prefix is advertised 48 times by the same=
 router in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 different Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix LSAs.<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 yes, what is wrong with the above? The exact same thing happe=
ns with<br>
=C2=A0 =C2=A0 Router LSA today. If you do not like it, your implementation =
can<br>
=C2=A0 =C2=A0 generate a dedicated Ext. Prefix LSA for each prefix. Both wa=
ys are<br>
=C2=A0 =C2=A0 allowed. But your implementation MUST be able to deal with th=
e<br>
=C2=A0 =C2=A0 received Ext. Prefix LSAs that have multiple Ext Prefix TLVs.=
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 There are few more scenarios that needs to be c=
onsidered for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Multiple-Prefix TLV .Consider the following.<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Scenario B: Withdrawing of Prefix TLV. If on a =
particular router the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 prefix SID configured for one of its prefixes i=
s unconfigured, the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 router needs to withdraw that specific Prefix T=
LV from the OSPF<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 network.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 If this Prefix TLV was part of one or more LSA =
as described in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 scenario<br>
<br>
<br>
=C2=A0 =C2=A0 each prefix should be only advertised in a single Ext Prefix =
LSA...<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 A, then all such LSAs needs to be withdrawn by =
issuing a LSA of<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 MaxAge.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Also since each LSA has multiple Prefix TLVs , =
all other<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix-TLVs in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 that LSA will also get effected. This is undesi=
rable. Even if<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 there is<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 no duplicate prefix TLVs across LSAs, this prob=
lem is applicable<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 for the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA which is withdrawn.<br>
<br>
<br>
=C2=A0 =C2=A0 what you described above is incorrect. When Ext Prefix LSA ha=
s<br>
=C2=A0 =C2=A0 multiple Ext Prefix TLVs and you want to remove one of them, =
you<br>
=C2=A0 =C2=A0 simply regenerate the Ext Prefix LSA without the Ext Prefix T=
LV that<br>
=C2=A0 =C2=A0 corresponds to that prefix and keep the rest of the Ext Prefi=
x TLVs<br>
=C2=A0 =C2=A0 in the LSA - these prefixes are NOT affected.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I propose the following solutions for this prob=
lem.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 i) The Ext Prefix LSA can have a fixed instance=
 number<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 associated with<br>
<br>
<br>
=C2=A0 =C2=A0 above is by definition - Instance (or Opaque-ID), is part of =
the<br>
=C2=A0 =C2=A0 LSID, which together with the Adv-Rtr-ID uniquely identifies =
the LSA<br>
=C2=A0 =C2=A0 itself.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 it. Whenever a prefix-TLV is received, as part =
of any Ext Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA, it<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 needs to check for any modifications from the p=
revious LSA. If<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 none, it<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 will ignore that prefix-TLV. Else it will be up=
dated. In this<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 way, even<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 if a particular prefix-TLV is sent multiple tim=
es , and the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 latest one<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 is considered as per the age of LSA, it will ha=
ve no impact<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 internally<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 on the routes corresponding to that Prefix. Als=
o it will<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 significantly<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 reduce the Link State Database to be maintained=
, and it will<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 always be<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 one per router. Any new prefix TLV in the new L=
SA will be added,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 and if<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 any prefix TLV previously advertised is missing=
, will be removed.<br>
<br>
<br>
=C2=A0 =C2=A0 none of the above needs to be standardized. Base OSPF spec sp=
ecifies<br>
=C2=A0 =C2=A0 that newer version of LSA replaces the old one. The way you d=
eal<br>
=C2=A0 =C2=A0 with it is up to you. The only requirement is that you only u=
se info<br>
=C2=A0 =C2=A0 that is in the latest version of the LSA.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 ii) The Ext Prefix LSA can allow only a single =
Top Level TLV per<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA.<br>
<br>
<br>
=C2=A0 =C2=A0 no, we want to have the flexibility in packing the single or<=
br>
=C2=A0 =C2=A0 multiple TLVs in the Ext Prefix LSA.<br>
<br>
=C2=A0 =C2=A0 regards,<br>
=C2=A0 =C2=A0 Peter<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Here announcing new Prefix and its withdraw can=
 happen<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 individually and<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 will be a much simpler approach. This is simila=
r to approach<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 followed in<br></div></div>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 OSPF TE (<a href=3D"https://tools.ietf.org/html=
/__rfc3630#section-2.4" target=3D"_blank">https://tools.ietf.org/html/_<u><=
/u>_rfc3630#section-2.4</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;<a href=3D"https://tools.ietf.org/html/rfc3=
630#section-2.4" target=3D"_blank">https://tools.ietf.org/html/<u></u>rfc36=
30#section-2.4</a>&gt;)<span class=3D""><br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Regards<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Santanu<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 On Wed, Mar 25, 2015 at 7:03 PM, Peter Psenak &=
lt;<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@cisco.com=
</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com"=
 target=3D"_blank">ppsenak@cisco.com</a>&gt;<br></span><div><div class=3D"h=
5">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com"=
 target=3D"_blank">ppsenak@cisco.com</a> &lt;mailto:<a href=3D"mailto:ppsen=
ak@cisco.com" target=3D"_blank">ppsenak@cisco.com</a>&gt;&gt;&gt; wrote:<br=
>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Santanu,<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On 3/25/15 14:08 , Santanu =
Kar wrote:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Authors<br=
>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The Section 2=
, doesn&#39;t provide any clarification on the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&#39;Instance=
&#39; part<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of the Link I=
D of<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0OSPFv2 Extend=
ed Prefix Opaque LSA.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Instance is an arbitrary nu=
mber to make each OSPFv2<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Extended Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Opaque LSA&#39;s LSID uniqu=
e, please see RFC5250, section abut<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Opaque-ID.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0There can be =
two possible implementations<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A01) When a Seg=
ment routing enabled router is advertising<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 multiple Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Prefix TLV, i=
t can keep repacking it into a single Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0LSA, as<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0has been ment=
ioned in end of section 2 and keep<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 increasing the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0instance<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0. The lowest =
instance is taken. Higher instance from<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 same router for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0same prefix i=
s ignored.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0above only applies to the c=
ase where OSPFv2 Extended Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 TLV is<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0advertised for the _same_ p=
refix in multiple different OSPFv2<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Extended Prefix Opaque LSAs=
, which is either an error or<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 temporary<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0condition.<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02) Another po=
ssible way is, not to go for this<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 repacking. Instead it<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0should be pos=
sible to originate separate Ext Prefix<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 LSAs for<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0every Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Prefix TLV, a=
nd only one TLV per LSA. The instance<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 number or<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Opaque id<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0can be derive=
d from the prefix/interface so as to<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 ensure its<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0unique for<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0every prefix =
originating from the same advertising router.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0yes above is correct, but t=
he draft allows to pack multiple Ext<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Prefix TLVs in the single E=
xtended Prefix Opaquer LSA if the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0implementation prefers to d=
o so.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The draft is =
not clear on whether (2) can be allowed.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 It hasn&#39;t<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the draft says:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Multiple OSPF Extended Pref=
ix TLVs MAY be advertised in<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 each OSPFv2<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Extended Prefix Opaque LSA.=
&quot;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0That means it can be one or=
 more.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0mentioned tha=
t the instance is topology independent and<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0dependent on =
how<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0we choose to =
implement it. The TE RFC however has a section<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0devoted to th=
is<br></div></div>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://tools.ietf.org/html/____rfc3=
630#section-2.2" target=3D"_blank">https://tools.ietf.org/html/__<u></u>__r=
fc3630#section-2.2</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;<a href=3D"https://tools.ietf.org/html/__rf=
c3630#section-2.2" target=3D"_blank">https://tools.ietf.org/html/_<u></u>_r=
fc3630#section-2.2</a>&gt;<span class=3D""><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a href=
=3D"https://tools.ietf.org/html/__rfc3630#section-2.2" target=3D"_blank">ht=
tps://tools.ietf.org/html/_<u></u>_rfc3630#section-2.2</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;<a href=3D"https://tools.ietf.org/html/rfc3=
630#section-2.2" target=3D"_blank">https://tools.ietf.org/html/<u></u>rfc36=
30#section-2.2</a>&gt;&gt;<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I can add a similar text to=
<br></span>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft-ietf-ospf-prefix-link-__<u></u>__attr.<sp=
an class=3D""><br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0thanks,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Peter<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Please give y=
our thoughts on this.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Santanu<br>
<br>
<br>
<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 --<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Best Regards<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Santanu Kar<br></span>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------------------------<u></u>__--------=
--------------------<u></u>--__--------------------------<u></u>----__----<=
span class=3D""><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 When you really want something to happen, the w=
hole universe<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 conspires so that your wish comes true<br></spa=
n>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 ------------------------------<u></u>__--------=
--------------------<u></u>--__--------------------------<u></u>----__----<=
span class=3D""><br>
<br>
<br>
<br>
<br>
<br>
--<br>
Best Regards<br>
Santanu Kar<br>
------------------------------<u></u>------------------------------<u></u>-=
-----------------------------<u></u>----<br>
When you really want something to happen, the whole universe<br>
conspires so that your wish comes true<br>
------------------------------<u></u>------------------------------<u></u>-=
-----------------------------<u></u>----<br>
</span></blockquote>
<br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature">Best Regards<br>Santanu Kar<br>-----------------------=
-----------------------------------------------------------------------<br>=
When you really want something to happen, the whole universe <br>conspires =
so that your wish comes true<br>-------------------------------------------=
---------------------------------------------------</div>
</div>

--001a1134056e45e6a505128cf600--

