Re: [Last-Call] Opsdir last call review of draft-ietf-lsr-flex-algo-23

[Peter Psenak <[e-mail]>]

Hi Linda,

On 22/09/2022 00:24, Linda Dunbar via Datatracker wrote:
> Reviewer: Linda Dunbar
> Review result: Has Nits
> 
> I have reviewed this document as part of the Ops area directorate's ongoing
> effort to review all IETF documents being processed by the IESG.  These
> comments were written primarily for the benefit of the Ops area directors.
> Document editors and WG chairs should treat these comments just like any other
> last call comments.
> 
> This document specifies a set of extensions to IGP to enable multiple
> topologies within one IGP domain, and each topology has its unique
> constraint-based path computation metric.
> 
> It would be very helpful if Section 15 (Operational Consideration) included
> some considerations on the number of topologies to be created for exemplary
> deployments. Even though theoretically, hundreds/thousands of topologies can be
> supported by the mechanisms described in the draft, in practice, probably only
> a handful of (or even fewer) Flex-Algorithms are needed per IGP domain. It
> would be so much easier to follow the document if knowing only two or three
> Flex-Algorithm are needed.

the maximum number of flex-algos is determined by the algorithm range 
that is (128-255), as specified in section 4 of the draft:

https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-23#section-4


I can add a sentence in the draft saying that the expected deployment is 
to use only a subset of those.

thanks,
Peter

> 
> Thank you
> Linda Dunbar
> 
> 
>