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[spring] A technical concern regarding draft-schmutzer-spring-cs-sr-policy-00

Alexander Vainshtein <Alexander.Vainshtein@rbbn.com> Sun, 24 July 2022 17:03 UTC

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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "draft-schmutzer-spring-cs-sr-policy.all@ietf.org" <draft-schmutzer-spring-cs-sr-policy.all@ietf.org>
CC: "spring@ietf.org" <spring@ietf.org>, Rotem Cohen <Rotem.Cohen@rbbn.com>, Nitsan Dolev <Nitsan.Dolev@rbbn.com>, "pce@ietf.org" <pce@ietf.org>, Michael Gorokhovsky <Michael.Gorokhovsky@rbbn.com>
Thread-Topic: A technical concern regarding draft-schmutzer-spring-cs-sr-policy-00
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Date: Sun, 24 Jul 2022 17:02:45 +0000
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Subject: [spring] A technical concern regarding draft-schmutzer-spring-cs-sr-policy-00
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Hi all,
I would like to clarify that, from my POV, my technical concerns about draft-schmutzer-pce-sr-cs-routing-policies<https://datatracker.ietf.org/doc/html/draft-schmutzer-pce-cs-sr-policy-02> presented in my email dated 11-Jul-22<https://mailarchive.ietf.org/arch/msg/spring/ctrAx6JFaNwLhMCQB5QUdBCR7B8/> fully apply to this draft.

Specifically, the authors do not define any mechanisms that would prevent possible usage of unprotected Adj-SIDs used in the configuration of the candidate paths of CR-CS policies from being also used by such well-known and widely deployed mechanisms as TI-LFA and Segment Routing Microloop Avoidance.  As a consequence, the "strict BW guarantees"  that are expected of SR-CS policies would be violated every time one of these mechanisms would result in some "regular" traffic being sent via the paths defined by such mechanisms.

Even if such mechanisms were defined in a future version of  draft-schmutzer-spring-cs-sr-policy, a retrofit of existing implementations of TI-LFA and/or SR Microloop Avoidance would be required.

I understand the motivation for CR-SC Policies, but I strongly suspect that SR cannot be used as a replacement for MPLS-TP when it comes to BW guarantees.

Regards,
Sasha

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