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

[Anoop Ghanwani <[e-mail]>]

Is there an RFC that defines what weighted ECMP and/or UCMP are?

Searching around on the net it looks like there are at least some vendor
docs that use the term interchangeably (and explicitly state so).

If there is a difference between the two and we want this draft to be used
for both, then perhaps all instances of WECMP in the draft would need to be
revisited for consistency.

Thanks,
Anoop

On Fri, Sep 5, 2025 at 1:06 AM Robert Raszuk <[e-mail]> wrote:

> Perfect on both points raised.
>
> On Fri, Sep 5, 2025 at 6:16 AM Ketan Talaulikar <[e-mail]>
> 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 <[e-mail]> 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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