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Re: [spring] Suggest some text //RE: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming

Robert Raszuk <robert@raszuk.net> Sun, 01 March 2020 13:07 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Sun, 01 Mar 2020 14:07:31 +0100
Message-ID: <CAOj+MMHZ7sVE+pHOEhDPZvP0u-01cD0oTHEo5x=J=PEVj0iTYA@mail.gmail.com>
Subject: Re: [spring] Suggest some text //RE: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming
To: "Joel M. Halpern" <jmh@joelhalpern.com>
Cc: "spring@ietf.org" <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, 神明達哉 <jinmei@wide.ad.jp>
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Nope.

Node can advertise two SIDs or PSP in a given network may be a well know
function (to limit IGP burden) Example: odd SID includes PSP and even SID
does not.

O*A*M  packets can use on the exact same path but the penultimate hop
traversal is directed by even SID and is not subject to PSP.

Done.

Thx,
R.

On Sun, Mar 1, 2020 at 5:50 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:

> Presuming that by "OEM" you mean "OAM", then no, this does not work.
> If the OAM is intended to monitor a path that has a last SID whose
> flavor is PSP, then something will break.  The monitoring will monitor
> something else, or it won't monitor the last hop, or...
>
> Given the point that was made that ignoring a source route (SRH or
> otherwise) with segments-left = 0 is a mandatory behavior of 8200, I am
> really left puzzled as to what use case justifies the contortion of PSP.
>
> Yours,
> Joel
>
>

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