Check if BGP peer is up:
show ip bgp vpnv4 vrf [vrf name] summary | i Neighbor|[neighbor IP]
Check if PIM neighborship is up:
show ip pim vrf [vrf name] neighbor [interface]
Check if they are joining anything:
show ip mroute vrf [vrf name] | i [interface]
show ip mroute vrf [vrf name] | i [interface] | i [multicast group IP]
show ip mroute [muticast group IP] »> to check for joins
*look for interface in Outgoing Interface List (aka OIL)
*check uptime
Check ACL and make sure they're permitted to join multicast group
show ip access-list [ACL name] | i [multicast group IP]
IOS XR
Check if BGP peer is up:
show bgp vrf [vrf name] summary | i [neighbor IP]
Check if PIM neighborship is up:
show pim vrf [vrf name] neighbor [interface]
Check if they are joining anything:
show mrib vrf [vrf name] ipv4 route
Check ACL and make sure they're permitted to join multicast group
show access-lists [ACL name]
Additional commands:
show mfib vrf [vrf name] interface [interface name] route | i Flags: $
show mfib vrf [vrf name] interface [interface name] route | i Flags: C