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PIM neighbor:

<#root> ip22-72a# show ip pim neighbor PIM Neighbor Table Neighbor Address Interface Uptime Expires Ver Mode 10.2.1.1 Ethernet3/1 2d00h 00:01:15 v2

From the show ip pim neighbor command output, the PIM neighborship looks good. Enter the show ip mroute command in order to see whether Router 72a has good mroute:

<#root> ip22-72a# show ip mroute 224.1.1.1 IP Multicast Routing Table Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected, L - Local, P - Pruned, R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT, M - MSDP created entry, X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel Y - Joined MDT-data group, y - Sending to MDT-data group Outgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.1.1.1), 00:10:42/stopped, RP 0.0.0.0, flags: DC Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet3/1, Forward/Dense, 00:10:42/00:00:00 Ethernet3/2, Forward/Dense, 00:10:42/00:00:00

(10.1.1.1, 224.1.1.1), 00:01:10/00:02:48, flags: Incoming interface: Ethernet2/0, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet3/1, Forward/Dense, 00:01:10/00:00:00 Ethernet3/2, Forward/Dense, 00:00:16/00:00:00

ip22-72a#

You can see from the show ip mroute 224.1.1.1 command that the incoming interface is Ethernet2/0, while Etheret3/1 is expected. Enter the show ip mroute 224.1.1.1 count command in order to see if any multicast traffic for this group arrives to the Router 72a and what happens next:

<#root>