I have the following question, but I don't understand on the answer:

When is a dense mode PIM interface added to the mulitcast routing table
for a specific group?

A)    The interface connects a Catalyst switch.  Both the router
interface and the Catalyst are running CGMP
B)    The interface is added to the mroute table if DVMRP is heard
C)    A host has used ICMP to join the group and the router is a
designated router
D)    There are PIM neighbors but the group has been pruned.

The answer is B & C.  But I thought dense-mode PIM interface is always
added to the multicast routing table.

Please help.

Regards,
Hunt Lee
IP Solution Analyst
Cable and Wireless




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