controlling multicasts in a switched environment

From: John Conzone (jkconzone@xxxxxxxx)
Date: Mon May 01 2000 - 20:44:40 GMT-3


   
       I've been exploring multicast control using CGMP on Catalyst
   switches. I see that CGMP is on by default, and creates lists of hosts
   who have joined multicast groups and forwards multicast packets only
   out ports to those hosts. The fast leave feature decreases the time it
   akes for a host top be deleted from a group, or is it the time it akes
   to delet a group.
       Anyway, my real question is that all the documentation states that
   this must work in conjunction with a router enabled with CGMP. Does
   this mean a router with PIM enabled on its interfaces? I'm a little
   confused. I thought PIM used IGMP.
   Or can you enable CGMP on routers without PIM. OR does PIM invoke
   both?
       AHHHHHHHHHHHHH!!!!! Cisco brain freeze!



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