You should probably open a support ticket, and/or make a separate question in regards to an IGMP querier running inside a blade. Multicast works well on recent code when the IGMP querier on the upstream network, but your question is related to runnin...

You can use any IP address you like, even 1.2.3.4 The IP only matters when you are doing PIM, which sends its own queries and makes configuring a querier unnecessary on the switches.  

Keep in mind this line will cause you to stop flooding link-local multicast if anything on the VLAN joins the link-local multicast group. no ip igmp snooping link-local-groups-suppressionThis will essentially put you a single packet away from an outa...

By default most switches will supress link-local (224.0.0.0/24)  group joins and flood these groups like broadcasts, but this can be disabled with the following command: no ip igmp snooping link-local-groups-suppression  With this feature enabled, th...