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[Pce] PCE SID-algo draft extension

"Samuel Sidor (ssidor)" <ssidor@cisco.com> Tue, 10 January 2023 10:21 UTC

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From: "Samuel Sidor (ssidor)" <ssidor@cisco.com>
To: "pce@ietf.org" <pce@ietf.org>
CC: pce-chairs <pce-chairs@ietf.org>
Thread-Topic: PCE SID-algo draft extension
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Date: Tue, 10 Jan 2023 10:21:02 +0000
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Subject: [Pce] PCE SID-algo draft extension
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Hi all,

I would like to get feedback from PCE WG for one extension proposed for existing SID-algo draft<https://datatracker.ietf.org/doc/html/draft-tokar-pce-sid-algo-05#name-sid-algorithm-constraint-2> (currently expired), which is trying to cover all existing algorithm types as defined in IGP - that includes SPF (algo 0), Strict-SPF (algo 1) and Flex-algo (algo 128-255)
It introduced SID-algo constraint, which currently can be used for filtering SIDs used in path computed by PCE.
To be able to compute inter-domain Flex-algo path, PCE Flex-algo path-computation must be aligned with path-computation done by IGP (Use ASLA attributes, honor FAD lookup priorities,...). This use-case is different one from SID filtering we need to use constraints/metric-type from Flex-algo definition that is bound to SID algo number specified in constraint.

Before we modify the draft, we would like to know if WG has any objection.

Thanks,
Samuel

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