Re: [Isis-wg] draft-previdi-filsfils-isis-segment-routing

Patryk Konczyk <pkonczyk@gmail.com> Thu, 25 April 2013 15:31 UTC

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Date: Thu, 25 Apr 2013 16:31:22 +0100
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From: Patryk Konczyk <pkonczyk@gmail.com>
To: sprevidi@cisco.com
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Cc: isis-wg@ietf.org
Subject: Re: [Isis-wg] draft-previdi-filsfils-isis-segment-routing
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 Hello Stefano I've seen Clarence presentation about Segment Routing
at MWC in Paris. I like the concept of using IGP for signalling and to
simply use existing tools like remote LFA for traffic protection.
Traffic Engineering looks simple as well. My initial concern was
around large label stack  especially in cases where there is
significant amount of Traffic Engineering going on. Clarence pointed
out that this can be resolved with loose hops using just two labels in
majority of the cases.
 I was also chatting to Stewart Bryant and he suggested compressing
the label stack I belive you touched on that on page 6 in the ECMP
context. I was wondering if this could be extended for strict and
loose path signalled with single label only, so that we have the same
label stack as in LDP/RSVP based solution. This probably would require
additional signalling.
 IPv6 variant is looking interesting as well. I'm hoping that more
details will appear in the draft shortly and we will have more
discussion on the mailing list.

In Section 2.2 comparative study has been mentioned could your share
more details ?

 Also are there any plans to discuss segment routing in Berlin ?

Thanks Patryk Konczyk