multicast TTL settings

[Robert Olson]

>Based on what I've seen from the setups here, Argonne uses the TTL 32
>threshold to get offsite to agency networks like vBNS and NREN, and I think
>TTL 64 to get to commercial networks that do multicast peering with us.
>
>It may be that each site will have their own policy for what the TTL needs
>to be in order to participate, so this is one of the pieces of information
>each site will need to provide.

I think a better solution would be to set up an administrative scope for
the AG stuff, so we don't have to worry about high-bw multicast leaking out
from where we want it. Does that make sense?

--bob