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IGMP snooping support is not yet included in bridge-utils or iproute2, but it can be easily controlled through sysfs interface. For brN, the settings can be found under /sys/devices/virtual/net/brN/bridge.
multicast_snoopingThis option allows the user to disable IGMP snooping completely. It also allows the user to reenable snooping when it has been automatically disabled due to hash collisions. If the collisions have not been resolved however the system will refuse to reenable snooping.
multicast_routerThis allows the user to forcibly enable/disable ports as having multicast routers attached. A port with a multicast router will receive all multicast traffic.
The value 0 disables it completely. The default is 1 which lets the system automatically detect the presence of routers (currently this is limited to picking up queries), and 2 means that the ports will always receive all multicast traffic.
Note: this setting can be enabled/disable on a per-port basis, also through sysfs interface (e.g. if eth0 is some bridge's active port, then you can adjust /sys/...../eth0/brport/multicast_router)
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