[c-nsp] Fw: Multicast boundaries

[christian.macnevin at uk.bnpparibas.com]

Scratch that, turns out we have some potential for sourcing traffic to the 
wrong groups, so the
boundary's still useful.

Cheers.
----- Forwarded by Christian MACNEVIN/UK/EUROPE/GROUP on 20/10/2006 12:13 
-----

Christian MACNEVIN

20/10/2006 10:43

To
cisco-nsp
cc

Subject
Multicast boundaries





Hello chaps,
I was previously under the impression that multicast boundaries would 
prevent devices joining multicast groups,
as well as binning the data. It would seem however that that's not true, 
and hosts still appear in the mroute table,
though they won't receive data.
Given this, we've implemented IGMP ACLs, as engineers troubleshooting are 
bound to get confused, and it seems
better just to prevent the join than be forced to drop every packet.
Is there any point implementing multicast boundaries at the access at all? 
It was the recommendation we were
given, but I can't currently see any point in it.
Cheers
Christian


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