From: gladston@br.ibm.com
Date: Wed Feb 09 2005 - 01:50:53 GMT-3
Well, if you see results on show ip igmp group on the router attached to the receiver, it is time to investigate PIM.
After receiving a signal (igmp) that there is a receiver, the router should itself signal (through PIM) the router connected to the source that it wants to receive the multicast.
As you might known, PIM Dense Mode always try to send the multicast; remote routers must prune the tree so the link is not used by the undesirable multicast. When a timer expire, remote routers need to send prune messages again, otherwise the router connected to the source will forward the multicast.
So, the first question:
Are the PIM routers recognizing the neigbhor as PIM neighbor?
(show ip pim neighbor)
Considering the answer is yes, the second question:
Is the interface where multicast is arriving the interface used to reach the router connected to the source?
(show ip rpf x.x.x.x) where x.x.x.x is the source of multicast packets
Considering again an "yes" answer, the third question:
show ip mroute shows incoming and outgoing interfaces?
If the problem is there yet, could you send configs/result of commands?
Best Regards
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