[pim] Re: I-D Action: draft-ietf-pim-multicast-lessons-lea rned-06.txt

Thanks - this is a really nice contribution - represents a lot of work and perspective.

There’s one factor for the multi-domain adoption of multicast that I think was pretty important but wasn’t mentioned:

Aside from traffic engineering optimizations, ISPs as much as possible do “hot-potato” routing which tries to get the packet off their network as soon as possible. In contrast, multicast turns that on its head and causes “cold-potato” routing where the packet stays on the ISPs network as far as possible before exiting, thus sucking resources.

DaveO.

On 17 Oct 2025, at 21:08, [email protected] wrote:

> Internet-Draft draft-ietf-pim-multicast-lessons-learned-06.txt is now
> available. It is a work item of the Protocols for IP Multicast (PIM) WG of the
> IETF.
>
>    Title:   Multicast Lessons Learned from Decades of Deployment Experience
>    Authors: Dino Farinacci
>             Lenny Giuliano
>             Mike McBride
>             Nils Warnke
>    Name:    draft-ietf-pim-multicast-lessons-learned-06.txt
>    Pages:   23
>    Dates:   2025-10-17
>
> Abstract:
>
>    This document gives a historical perspective about the design and
>    deployment of multicast routing protocols.  The document describes
>    the technical challenges discovered from building these protocols.
>    Even though multicast has enjoyed success of deployment in special
>    use-cases, this draft discusses what were, and are, the obstacles for
>    mass deployment across the Internet.  Individuals who are working on
>    new multicast related protocols will benefit by knowing why certain
>    older protocols are no longer in use today.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-pim-multicast-lessons-learned/
>
> There is also an HTMLized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-pim-multicast-lessons-learned-06
>
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-pim-multicast-lessons-learned-06
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>
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DaveO

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