multicast confusion

From: John Conzone (jkconzone@xxxxxxxx)
Date: Sat Sep 09 2000 - 17:30:19 GMT-3


   
       I've been going over some multicast configurations and need some
   clarification.
       I've been configuring PIM both dense and sparse, and have used the
   IP IGMP JOIN X.X.X.X command to check multicast routing, buit I didn't
   think it was required to route mulitcasts to hosts off of router
   interfaces.
       In Caslow's book it says that IGMP JOIN must be enabled on an
   interface for it to route multicast packets to hosts on that interface
   who want to join a (that?) group, or that is my interpretation. The
   Cisco CD examples don't show this. They have the global IP MULTICAST,
   the interface PIM commands, and RP commands if neccessary.
       Is the join command required to route muticasts to host off of
   interfaces? Can anyone clear up my confusion, as I have not done
   multicast routing out of the lab.
       Thanks!



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