All things related to multicast

[David Farmer <>]

I'd like to suggest we create an NTAC work item on multicast, that being what is our current community recommendations for interdomain multicast.

I see 4 possibilities;

1. Native SSM, with support on the Internet2 backbone as well.

2. AMT SSM, with no support for native SSM multicast on the Internet2 backbone, but coordination of the effort.

3. Some Combination of 1 & 2, we will need to define what this means for the Internet2 backbone.

4. Completely Deprecate Interdomain Multicast Coordination within our community

Note #4 still allows individual entities to do AMT if they wish, there is just no community coordination of the effort or explicit support by the Interent2 or the backbone.

Honestly, I see us heading toward #4, and if that is where we want to go as a community, I'm ok with that. However, I would rather we decide that intentionally, than get there by attrition and apathy.

What do others think?

Thanks

 

On Fri, Aug 28, 2020 at 8:44 AM Michael H Lambert <> wrote:

A point which has never been completely clear to me (since I admit to
having thought about multicast as little as possible the past decade) is
whether the multicast SAFI is still needed when doing SSM.  RFC 8815
doesn't mention this, but RFC 8313 (BCP for SSM) suggests it may still
be needed.  I had thought it was just used for ASM RPF checking, but I
could be mistaken.

Michael

Bill Owens wrote on 2020-08-28 06:15:
> That's because you're doing a (*,G) join to the dirges stream.
>
> (In another age I would have set up a loop of dirges on a utility machine somewhere, but I've already ripped most of the multicast config out of our network. All inter-domain multicast is deprecated.)
>
> Bill.

--

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