Re: [Lsr] Alvaro Retana's Discuss on draft-ietf-lsr-flex-algo-24: (with DISCUSS)

[Alvaro Retana <[e-mail]>]

On October 6, 2022 at 6:58:18 AM, Peter Psenak wrote:


Peter:


...
> > (1) The text above instructs implementations of [RFC8667] and
> > [RFC8665] to stop advertising the specific Flex-Algorithm value, but
> > those RFCs (if I remember correctly) don't say anything about *not*
> > advertising the SR-Algorithm TLV/sub-TLV. This document should
> > formally Update those RFCs.
>
> ##PP2
> advertising the SR-Algorithm TLV is optional.
>
> https://datatracker.ietf.org/doc/html/rfc8665#section-3.1
>
> "The SR-Algorithm TLV is optional. It SHOULD only be advertised once
> in the Router Information Opaque LSA."
>
>
> Advertising any set of algorithms in this TLV is supported. A router is
> free to add or remove any algorithm value from the TLV. This is all well
> supported by both above mentioned RFCs. I don't see any need for update.

Even if optional, that concerns me is the contents of the TLV.
Looking at them, both RFCs say: "The SR-Algorithm TLV allows a router
to advertise the algorithms currently used by the router..."

Sure, there's a connection between "MUST NOT announce" (from 5.3) and
"currently used".   You're right, we don't need an update.



> > (2) The text related to the Update should be in §11, which is where
> > the participation advertisement is specified. Text should also be
> > added to §11.2 to indicate that other data-planes have to do the same
> > thing.
>
> ##PP2
> I have added following to the section 11:
>
> "Advertisement of the participation for any particular Flex-Algorithm
> in any data-plane is subject to the condition specified in
> Section 5.3."
>
> Would that be sufficient?

Yes, that's fine.


I'm ok with the other changes too.

I'll clear my DISCUSS.

Thanks!!

Alvaro.