Stewart,
Lots of thanks for the clarification.
Coming back to the TI-LFA draft, I think that it should explicitly state that
in the case of Prefix-SIDs it is applicable to Prefix-SIDs associated with the
strict SPF algorithm but does not guarantee any results in the case of
Prefix-SIDs associated with the default algorithm.
Regards,
Sasha
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Email: alexander.vainsht...@ecitele.com
From: Stewart Bryant [mailto:stewart.bry...@gmail.com]
Sent: Thursday, June 14, 2018 3:59 PM
To: Alexander Vainshtein <alexander.vainsht...@ecitele.com>;
stephane.litkow...@orange.com
Cc: Michael Gorokhovsky <michael.gorokhov...@ecitele.com>;
draft-ietf-spring-segment-routing.auth...@ietf.org; spr...@ietf.org;
rtgwg@ietf.org; draft-bashandy-rtgwg-segment-routing-ti-lfa.auth...@ietf.org
Subject: Re: Is TI-LFA compatible with the default SR algorithm?
On 14/06/2018 13:45, Alexander Vainshtein wrote:
Please note that RFC 5286 explicitly states that it is only applicable to
intra-domain routing only with OSPF or IS-IS as IGP.
It does not mention the possibility of local policies overriding shortest path
routing provided by these protocols.
10 years ago when we were thinking about these early IPFRR schemes I don't
recall anyone considering anything
other that simple Dijkstra paths for IP. The exception perhaps was Not-Via, but
in that case base connectivity
and repair had orthogonal address spaces. I am not sure is that is the
direction with policy and flex, but
that may be a required direction for unconditional safety.
- Stewart
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