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if the sites are layer 3 reachable, you can use the multisite feature. you will need to configure border gateways in a multisite deployment;note the licensing requirements detailed here-> https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexu...
did you enable mac move notification as said above? if so, are you seeing any logs in the switch?also, collect below outputs from both the swtiches please;show span vl 94show ip igmp snooping qu vl 94sh span det | in last|exec|from--> multiple timesa...
what is connected to Gi4/18?is there any MAC moves happening in the switches? you can enable "mac address-table notification mac-move". Also, which switch is supposed to be the IGMP querier for the vlan-94? can you check the show ip igmp snooping que...
