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 220.127.116.11. 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 18.104.22.168
22.214.171.124 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?
Re: How to troubleshoot this multicasting problem?
with the limited information i have form you, i think you have fallen for the classic auto rp catch22 situation viz. autorp is used to disperse RP information for PIM sparse mode but autorp itself uses dense mode multicasting for its protocol operation.
confirm that all L3 interfaces have one of the two options:
1) change PIM to pim sparse-dense mode instead os sparse-mode
2) the later IOS will let you use ip pim autorp listner command to enable the routers to run dense mode for autorp even if the interfaces are configured with only sparse-mode.
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