From: John Conzone (jkconzone@xxxxxxxx)
Date: Sat May 13 2000 - 14:50:09 GMT-3
Thanks, Kevin. This is a greatboard to find out EXACTLY how stuff works!
Well, I'm on CCIEBootcamp rack 1 doing LANE now. Never did LANE before.
Should have picked the basic ATM lab before jumping into 11, but what the
heck. Its taken me 4 hours to do the 2 hour part! I have learned a lot
about LANE.
Back at it, and thanks!
----- Original Message -----
From: "Kevin M. Woods" <kev@nil.org>
To: "John Conzone" <jkconzone@home.com>
Cc: "ccielab" <ccielab@groupstudy.com>
Sent: Saturday, May 13, 2000 1:28 AM
Subject: Re: mulicast question again
> If a router receives a multicast frame and it's not running any multicast
> routing protocol then the frame is dropped if the receiving interface is
> not a member of the group. If it is a member of the group, it will allow
> the frame for itself but not forward it.
>
> A switch will flood the frame just as it will a broadcast, so switched or
> not a LAN can successfully use multicast applications.
>
> Kevin
>
> // 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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