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[Idr] Re: AD evaluation review of draft-ietf-idr-link-bandwidth-15

Robert Raszuk <robert@raszuk.net> Thu, 04 September 2025 18:39 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 04 Sep 2025 20:39:36 +0200
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Subject: [Idr] Re: AD evaluation review of draft-ietf-idr-link-bandwidth-15
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Hi,


> 19 Abstract
>
> 21   This document describes an application of BGP extended communities
> 22   that allows a router to perform WECMP (Weighted Equal-Cost
> 23   Multipath).
>
> <major> The document is actually specifying a new BGP extended community.
>
> SUGGEST:
> This document specifies a BGP Extended Community that enables routers to
> perform
> weighted equal-cost multipath (WECMP).
>

This document defines a new type not BGP Extended Community as an
attribute. I actually find the original text more correct.

Actually while we are at this sentence I would like to point out that it
can be also useful to perform unequal-cost multipath.

Especially with encapsulation and EPE the cost to more then one egress does
not need to be equal for multipath. That's legacy for hop by hop IP lookup
networks which is rather gone these days.

Thx,
Robert

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