From: John Conzone (jkconzone@xxxxxxxx)
Date: Fri May 12 2000 - 16:33:26 GMT-3
I have another question regarding multicast, and I can't seem to
find the answer. Here goes.
A standard cisco router with no multicast routing enabled. He gets
a packet destined for a mulitcast group.
What does he do with it. Does he drop it? Does he send it to his
default gateway since he has no path to that address? I know what he
does with a unicast, and I know what he does with a broadcast, both
with a helper and without.
All the literature dicusses the various means of routing
multicasts, and using CGMP to control it at the switch layer, and I'm
okay with all of that. But as I have stated before, I have worked on
lots of lans that don't have IP multicast turned on, yet use multicast
applications. How does multicasting work in a routed/switched lan with
no bells and whistles (ie. no PIM or IGMP snooping or CGMP). I just
can't seem to find any documentation on that.
Specifically I think about "ghosting" pc's on a lan.
Thanks all!
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