[Detnet] SR and DetNet, draft on sr-redundancy-protection

Balázs Varga A <balazs.a.varga@ericsson.com> Fri, 11 June 2021 13:12 UTC

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To: "draft-geng-spring-sr-redundancy-protection@ietf.org" <draft-geng-spring-sr-redundancy-protection@ietf.org>
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Thread-Topic: SR and DetNet, draft on sr-redundancy-protection
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Date: Fri, 11 Jun 2021 13:11:47 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/FAAaeuNrfichKDqL6R1NSppUFtw>
Subject: [Detnet] SR and DetNet, draft on sr-redundancy-protection
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Hi Authors,

thanks for the update of your draft, to clarify the proposed mechanism of
redundancy protection.

I have concerns regarding this draft as (1) the SRv6 approach does not follow the
DetNet architecture, and (2) repeats functionalities that are provided by the DetNet
service sub-layer but with serious limitations.

(1) DetNet has defined two sub-layers: the service sub-layer and the forwarding
sub-layer. The service sub-layer is responsible for service protection and the
forwarding sub-layer provides forwarding paths and resource allocation on top of
them for the DetNet flows. DetNet specifications allow to use any technology in
the forwarding sub-layer, including Segment Routing.

The SRv6 approach described in "draft-geng-spring-sr-redundancy-protection" breaks
the clear concept of the sub-layers by mixing them up. It contradicts to several
points at least to RFC8655 (DetNet Architecture), RFC8938 (Data Plane Framework)
and RFC8964 (DetNet MPLS Data Plane).

(2) The motivation for "draft-geng-spring-sr-redundancy-protection" is not clear especially
as the SRv6 approach seems to be repeating DetNet service sub-layer functionalities; however,
with a limited set of functionalities without any clear benefits.

Cheers
Bala'zs