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Re: [spring] PSP and USP uN Flavors

"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com> Wed, 09 September 2020 08:13 UTC

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "G. Sri Karthik Goud" <gkarthik=40juniper.net@dmarc.ietf.org>, "spring@ietf.org" <spring@ietf.org>
CC: Swamy SRK <swamys@juniper.net>
Thread-Topic: PSP and USP uN Flavors
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Date: Wed, 09 Sep 2020 08:13:22 +0000
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Subject: Re: [spring] PSP and USP uN Flavors
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Hi Karthik,

Please see inline.

Cheers,
Pablo.

From: spring <spring-bounces@ietf.org> On Behalf Of G. Sri Karthik Goud
Sent: miércoles, 26 de agosto de 2020 0:30
To: spring@ietf.org
Cc: Swamy SRK <swamys@juniper.net>
Subject: [spring] PSP and USP uN Flavors

Folks,

In draft-filsfils-spring-net-pgm-extension-srv6-usid, a uN represents an instruction (END, END.T) instantiated on a node. Can that instruction have a PSP or USP flavor?
[PC] The uN behavior is a new behavior. This behavior is defined in https://tools.ietf.org/html/draft-filsfils-spring-net-pgm-extension-srv6-usid-07#section-4.1.1
The uN behavior may be combined with the PSP, USP or USD flavors. Same applies to the uA behavior.
You have the full list of behaviors in Section 9 of the draft.

If so, wouldn't the PSP/USP cause an SRH that has not yet been processed to be deleted?
[PC] No. Leveraging the terminology defined in Section 2 of the draft: the PSP/USP/USD is only executed when you get to the Last uSID of the uSID Container.
Please have a look at the uN pseudocode in the latest revision of the draft (rev 7). I believe the pseudocode is clearer than in previous revisions.
Thanks, and let me know if unclear.

- Karthik



Non-Juniper

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