If there are hosts that dont support IGMP on a LAN Segment.
The router connecting that LAN segment can join IGMP group statically on their behalf
int f0/0
ip igmp static-group 235.1.1.1
Here if we ran a ping 235.1.1.1 from the source, the Router will not respond only the receivers ( End Hosts) will respond.
Whereas in the igmp join-group, even the router's interface responds.
Also (*,G) entry for join-group will have flags C (Connected) & L(Local)
The static-group will have flags C (Connected) only..
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