From: Brian Hescock (bhescock@xxxxxxxxx)
Date: Sat May 13 2000 - 11:23:00 GMT-3
John,
What specific application(s) are you referring to? Yes, multicast is
used on routers when you don't have muliticast routing enabled, such as
eigrp using 224.0.0.10, ospf using 224.0.0.5 and 224.0.0.6 etc. But to
the extent you seem to indicate, I believe the answer would is no. Perhaps
there's a redundant path where multicast routing is enabled or they're
using the "ip multicast help-map" command to convert a broadcast into
multicast at the far end. Let me know which application you're referring
to and the multicast group and I can check. Thanks,
Brian
On Fri, 12 May 2000, John Conzone wrote:
> 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 pack
et destined for a mulitcast group.
> What does he do with it. Does he drop it? Does he send it to his default gate
way since he has no path to that address? I know what he does with a unicast, a
nd 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. Bu
t as I have stated before, I have worked on lots of lans that don't have IP mul
ticast 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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