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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

Greg Mirsky <gregimirsky@gmail.com> Sun, 01 March 2020 13:32 UTC

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Sun, 01 Mar 2020 14:32:18 +0100
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To: Robert Raszuk <robert@raszuk.net>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, spring <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, 神明達哉 <jinmei@wide.ad.jp>
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Subject: Re: [spring] Suggest some text //RE: Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming
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Hi Robert,
yes, the path probably will be the same regardless whether PSP was
applied or not. But performance metrics, e.g. packet delay, may be
different for OAM and "regular" packets.

Regards,
Greg

On Sun, Mar 1, 2020, 14:08 Robert Raszuk <robert@raszuk.net> wrote:

> 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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