Re: [spring] FW: New Version Notification for draft-bonica-spring-srv6-end-dtm-01.txt

Gyan Mishra <hayabusagsm@gmail.com> Fri, 12 February 2021 08:55 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Fri, 12 Feb 2021 03:54:54 -0500
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To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Loa Andersson <loa@pi.nu>, Ron Bonica <rbonica@juniper.net>, "spring@ietf.org" <spring@ietf.org>
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Subject: Re: [spring] FW: New Version Notification for draft-bonica-spring-srv6-end-dtm-01.txt
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Hi Ron

This is an interesting  SR-MPLS to SRv6 interworking concept.

For an end to end LSP where you end up doing a translation on a border node
doing the interworking pop of MPLS label stack and impose of SRv6 IPv6
header in one direction and POP of SRv6 IPv6 header and impose of MPLS
label stack in the other direction, how does the LSP get stitched from
ingress PE to egress PE FEC destination if the intermediate node in the
path is a P node doing the translation interworking.  I think if the
translation interworking node was an egress PE that is doing the ASBR
function handoff seems plausible, but if it’s a P node as it appears in
your example how would the LSP get stitched end to end.

Could this same concept be used for MPLS LDP fo SRv6 interworking as well.

Kind Regards

Gyan

On Tue, Feb 9, 2021 at 8:00 PM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Thanks Ron, couldn’t have explained it better.
>
> Prefix SID (and the prefix associated with it) could be reachable over any
> interface participating in the topology,  depending on that topology
> structure, with topology changes, outgoing interface might change as well.
> Hence the outgoing interface is a runtime property of the top SID.
>
> Loa - does this clarify?
>
> Cheers,
> Jeff
> On Feb 9, 2021, 12:35 PM -0800, Ron Bonica <rbonica@juniper.net>et>, wrote:
>
> Loa,
>
> I think that Jeff means to say that " A SID instance is associated with
> SR-MPLS label stack. A label stack entry can be associated with a next hop.
> A recursive lookup may be required to derive the next hop from the topmost
> label stack entry."
>
> Ron
>
>
>
> Juniper Business Use Only
>
> -----Original Message-----
> From: Loa Andersson <loa@pi.nu>
> Sent: Monday, February 8, 2021 11:51 PM
> To: Jeff Tantsura <jefftant.ietf@gmail.com>om>; Ron Bonica <
> rbonica@juniper.net>
> Cc: spring@ietf.org
> Subject: Re: [spring] FW: New Version Notification for
> draft-bonica-spring-srv6-end-dtm-01.txt
>
> [External Email. Be cautious of content]
>
>
> Jeff,
>
>
> On 08/02/2021 14:51, Jeff Tantsura wrote:
>
> Hi Ron,
>
> Very useful document, thanks!
>
> Question wrt processing:
> As described in the draft:
> “A SID instance is associated with SR-MPLS label stack and outgoing
> interface.”
>
> I’d think that outgoing interface would be recursively resolved based on
> the top SID (and could change based on topological semantics).
> Could you please elaborate?
>
>
> What exactly do yo mean by "recursively"?
>
> /Loa
>
>
> Thanks!
>
>
> Cheers,
> Jeff
>
> On Feb 7, 2021, at 08:46, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>
> wrote:
>
> 
> Please review and comment
>
>
> Juniper Business Use Only
>
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: Sunday, February 7, 2021 11:41 AM
> To: Greg Mirsky <gregimirsky@gmail.com>om>; Peng Shaofu
> <peng.shaofu@zte.com.cn>cn>; Ron Bonica <rbonica@juniper.net>et>; Shaofu
> Peng <peng.shaofu@zte.com.cn>cn>; Shraddha Hegde
> <shraddha@juniper.net>et>; EXT- zhang.zheng@zte.com.cn
> <zhang.zheng@zte.com.cn>
> Subject: New Version Notification for
> draft-bonica-spring-srv6-end-dtm-01.txt
>
> [External Email. Be cautious of content]
>
>
> A new version of I-D, draft-bonica-spring-srv6-end-dtm-01.txt
> has been successfully submitted by Ron Bonica and posted to the IETF
> repository.
>
> Name: draft-bonica-spring-srv6-end-dtm
> Revision: 01
> Title: The SRv6 END.DTM Segment Type
> Document date: 2021-02-07
> Group: Individual Submission
> Pages: 7
> URL:
> https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-bonica-spring-srv6-end-dtm-01.txt__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8apyYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8F9ybUH5$
> Status:
> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-b
> onica-spring-srv6-end-dtm__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8ap
> yYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8Oytsvgj$
> Htmlized:
> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-bonica-spring-srv6-end-dtm__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8apyYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8F2zaLIO$
> Htmlized:
> https://urldefense.com/v3/__https://tools.ietf.org/html/draft-bonica-spring-srv6-end-dtm-01__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8apyYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8DZVjUN4$
> Diff:
> https://urldefense.com/v3/__https://www.ietf.org/rfcdiff?url2=draft-
> bonica-spring-srv6-end-dtm-01__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4t
> F8apyYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8CJWOgzv$
>
> Abstract:
> This document describes a new SRv6 segment type, called END.DTM. The
> END.DTM segment type supports inter-working between SRv6 and SR-MPLS.
> Like any segment type, END.DTM contains a function and arguments.
> The function causes the processing SRv6 node to remove an SRv6 header
> and impose an SR-MPLS label stack. The arguments determine MPLS-
> label stack contents.
>
>
>
>
> Please note that it may take a couple of minutes from the time of
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> The IETF Secretariat
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> --
>
> Loa Andersson email: loa@pi.nu
> Senior MPLS Expert loa.pi.nu@gmail.com
> Bronze Dragon Consulting phone: +46 739 81 21 64
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