Re: Use of SAP in a PIM SSM Network

[Tom Pusateri <pusateri@juniper.net>]

In message <3A1FE188.7BB9B54D@21rst-century.com> you write:
>
>SSM in intended for (or, is at least, ideal for) BROADCASTING. 
>In the real world, broadcasters
>stay up for years at a time. They don't like down time, even for seconds.
>They will NEVER want to renumber their class D addresses - these will
>get embedded in too many places (including .pls type files at the receivers)
>to make any such transition smooth.
>If there is a MAC layer collision, for any reason, they will want a fast
>means of resolving it. Now, I am sorry,
>but this sounds awful much like a static address to me.

The whole point is this should be left up to the source
to determine how to allocate group addresses. If your SSM
source wants to assign static addresses, that is a local decision.
But I would make a few points known upfront to your clients:

1. Others SSM sources will likely use the same group addresses
   and they must be prepared to deal with this.

2. Unused group addresses will be reclaimed.

In fact, I would encourage a group address lease which they can
renew at regular intervals.

Thanks,
Tom