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

Linda Dunbar <linda.dunbar@futurewei.com> Thu, 22 September 2022 14:53 UTC

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From: Linda Dunbar <linda.dunbar@futurewei.com>
To: Peter Psenak <ppsenak@cisco.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>
CC: "draft-ietf-lsr-flex-algo.all@ietf.org" <draft-ietf-lsr-flex-algo.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Opsdir last call review of draft-ietf-lsr-flex-algo-23
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Date: Thu, 22 Sep 2022 14:53:45 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/last-call/_IG-AyZLyl9_wIt1D_R8m3ie5PE>
Subject: Re: [Last-Call] Opsdir last call review of draft-ietf-lsr-flex-algo-23
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Peter, 

Thank you! I've studied this draft in LSR WG multiple times. I had a difficult time thinking how a router computing the paths when receiving 100+ topologies for one IGP domain, until being told most deployments only having handful of topologies. 

Linda


-----Original Message-----
From: Peter Psenak <ppsenak@cisco.com> 
Sent: Thursday, September 22, 2022 2:57 AM
To: Linda Dunbar <linda.dunbar@futurewei.com>; ops-dir@ietf.org
Cc: draft-ietf-lsr-flex-algo.all@ietf.org; last-call@ietf.org; lsr@ietf.org
Subject: Re: Opsdir last call review of draft-ietf-lsr-flex-algo-23

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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-lsr-flex-algo-23%23section-4&amp;data=05%7C01%7Clinda.dunbar%40futurewei.com%7C1f01cedc0b8b47ea277808da9c6fff8f%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637994302096955841%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=tZyj49cl6PorH91QIoebPQ8PcTTWKGNJwDaCIel2GEE%3D&amp;reserved=0


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
> 
> 
>

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