I have 2 Sunray servers that need to use multicasting to communicate keep-alives. Between the 2 servers, there are 4 Layer3 6509 switches (distribution1-core1-core2-distribution2). All have multicating routing enabled and running PIM spare-mode on all Layer3 interfaces. The 2 core are configured as RP router and MSDP peering each other.
The servers use multicast address 184.108.40.206. I can see the address in "sh ip igmp group" on both sides, however on one distribution switch, I have the following:
distribution2#sh ip pim rp 220.127.116.11
18.104.22.168 is not a sparse-mode group
distribution2#sh ip pim autorp
AutoRP is enabled.
PIM AutoRP Statistics: Sent/Received
RP Announce: 0/0, RP Discovery: 0/0
Seems that distribution switch can't discovery its RP (supposed to be the core on that side). How to troubleshoot the issue?
Thanks a lot