What version of UCS firmware are you using? Also, what adapters have you got installed on the blades hosting the multicast devices?
When it comes to Multicast on UCS, there are a couple of things to note:
Currently, the UCS Fabric Interconnects have IGMP snooping enabled by default, and this cannot be disabled (this will be fixed in the next major release via CSCte64886).
Therefore, you are required to have either of the following:
Multicast router in the VLAN; or
IGMP querier in the VLAN
NOTE: Currently, the UCS Fabric Interconnects have no IGMP querier functionality (this will be fixed in the major release via CSCtg82066) and as such, you are required to enable this querier functionality on a device in the upstream L2 network
Once you make the above changes, if you still have issues, please provide the following outputs:
show ip igmp snooping mrouter (if you have Multicast router)
show ip igmp snooping querier (if you have IGMP querier)
show ip igmp snooping groups
show ip igmp snooping vlan
show ip igmp snooping statistics vlan
Let me know how you go and if you have any further questions.
I've enabled multicast-routing on my 3750 switchs and now I can see all my multicast groups on both switchs and FI. The switch is sending IGMP query every 60 sec (default interval) witch trigger hosts to send IGMP reports. Therefore, my multicat groups are kept and cluster nodes can communicate :)
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