From: Prashant Shukla (shukla_cisco@yahoo.co.in)
Date: Tue Aug 21 2007 - 15:32:43 ART
Gurus,
Simple scenario:
R4------------R3-------------R6.
R4 is the RP/MA with the "ip igmp join-group for 224.9.9.9" , am using only sparse mode.
Now, R3 can ping the multicast address .
As "autorp listener" cmd is not configured on R4 and R3 , R3 still gets the RP mappings bcos R4 sends all its RP/MA traffic out its interfaces and even though the interface is not dense enabled, R3 will process the multicast traffic for RP/MA and use it.
Technically R3 should not send the same MA traffic to R6 . but it is.
AFAIK, R3 does not have the "listener" command enabled thus should only process the packet for itself and should not send it to other interfaces for R6.
Is my understanding correct ?
pls share your views.
Shukla.
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