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

Robert Raszuk <robert@raszuk.net> Fri, 05 September 2025 08:05 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 05 Sep 2025 10:05:41 +0200
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To: Ketan Talaulikar <ketant.ietf@gmail.com>
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Subject: [Idr] Re: AD evaluation review of draft-ietf-idr-link-bandwidth-15
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Perfect on both points raised.

On Fri, Sep 5, 2025 at 6:16 AM Ketan Talaulikar <ketant.ietf@gmail.com>
wrote:

> Hi Robert/Authors,
>
> Perhaps:
> This document specifies a type of BGP Extended Community that enables
> routers to perform
> weighted load-balancing in multipath scenarios.
>
> Thanks,
> Ketan
>
>
> On Fri, Sep 5, 2025 at 12:09 AM Robert Raszuk <robert@raszuk.net> wrote:
>
>> 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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