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

Ron Bonica <rbonica@juniper.net> Fri, 12 February 2021 17:04 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Gyan Mishra <hayabusagsm@gmail.com>, Jeff Tantsura <jefftant.ietf@gmail.com>
CC: Loa Andersson <loa@pi.nu>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: [spring] FW: New Version Notification for draft-bonica-spring-srv6-end-dtm-01.txt
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Date: Fri, 12 Feb 2021 17:03:57 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/spring/tzVAoIEtzy5OQFDczM9UXJPutSE>
Subject: Re: [spring] FW: New Version Notification for draft-bonica-spring-srv6-end-dtm-01.txt
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Gyan,

Control plane considerations are beyond the scope of this draft. That said, when I wrote the draft, I was thinking that the border nodes were ASBRs.

                                                                                      Ron




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From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Friday, February 12, 2021 3:55 AM
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Loa Andersson <loa@pi.nu>nu>; Ron Bonica <rbonica@juniper.net>et>; 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]


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<mailto: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<mailto:rbonica@juniper.net>>, 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<mailto:loa@pi.nu>>
Sent: Monday, February 8, 2021 11:51 PM
To: Jeff Tantsura <jefftant.ietf@gmail.com<mailto:jefftant.ietf@gmail.com>>; Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: spring@ietf.org<mailto: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<mailto:40juniper.net@dmarc.ietf.org>> wrote:


Please review and comment


Juniper Business Use Only

-----Original Message-----
From: internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>>
Sent: Sunday, February 7, 2021 11:41 AM
To: Greg Mirsky <gregimirsky@gmail.com<mailto:gregimirsky@gmail.com>>; Peng Shaofu
<peng.shaofu@zte.com.cn<mailto:peng.shaofu@zte.com.cn>>; Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; Shaofu
Peng <peng.shaofu@zte.com.cn<mailto:peng.shaofu@zte.com.cn>>; Shraddha Hegde
<shraddha@juniper.net<mailto:shraddha@juniper.net>>; EXT- zhang.zheng@zte.com.cn<mailto:zhang.zheng@zte.com.cn>
<zhang.zheng@zte.com.cn<mailto: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$<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-bonica-spring-srv6-end-dtm-01.txt__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8apyYbe9Xg2bqsA3kb6qY2F-3qbYIFrhF8F9ybUH5$>
Status:
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onica-spring-srv6-end-dtm__;!!NEt6yMaO-gk!Xh8RUucGY-Dw_xFwM_vU4tF8ap
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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.




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