[Isis-wg] FW: A question regarding IS-IS Segment Routing Extensions

Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Thu, 23 February 2017 12:09 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "isis-wg@ietf.org" <isis-wg@ietf.org>
Thread-Topic: A question regarding IS-IS Segment Routing Extensions
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Subject: [Isis-wg] FW: A question regarding IS-IS Segment Routing Extensions
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Fixing an email address error:(...

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Alexander Vainshtein
Sent: Thursday, February 23, 2017 2:08 PM
To: 'draft-ietf-isis-segment-routing-extensions@ietf.org' <draft-ietf-isis-segment-routing-extensions@ietf.org>
Cc: 'isis@ietf.org' <isis@ietf.org>rg>; 'spring@ietf.org' <spring@ietf.org>rg>; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>om>; Ron Sdayoor (Ron.Sdayoor@ecitele.com) <Ron.Sdayoor@ecitele.com>om>; Rotem Cohen (Rotem.Cohen@ecitele.com) <Rotem.Cohen@ecitele.com>
Subject: A question regarding IS-IS Segment Routing Extensions

Hi all,
My colleagues and I have a couple of questions about some behavioral aspects of IS-IS Segment Routing (SR) extensions.

Suppose that we have an IS-IS domain where some routers run IS-IS with SR extensions, and some routers run "vanilla" IS-IS for IPv4.

1.       What is supposed to happen when router A that runs IS-ISD without SR extensions establishes an adjacency with router B that runs IS-IS with SR extensions. Our expectations are that:

a.       An adjacency between A and B would be allowed to progress to its FULL state. Is that correct?

b.      B will distribute all SR-related TLVs and sub-TLVs to A. Is that correct?

c.       A will silently discard all SR-related TLVs and sub-TLVs it has received from B. Is that correct?

2.       What is supposed to happen if IS-IS adjacency between A and B reaches its FULL state, and then SR extensions are enabled in A. We expect that:

a.       It is possible to enable SR extensions in A without resetting its adjacency with B (or any other adjacent router). Is that correct?

b.      Once B learns that SR capabilities of A have changed, it floods its LSP database with all SR-related TLVs and sub-TLVs to A. Is that correct?


A brief scan of the draft did not yield answers to any of the questions above. Timely feedback would be very highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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