Layer 3 IGMP

IP networks use IGMP to manage multicast traffic across Layer 3 boundaries. When IGMP is enabled on your network, routers and other network devices use it to determine the hosts in the domain that are interested to receive multicast traffic.

The multicast group is assigned a multicast address. The device registers to receive the stream and joins the group by sending an IGMP Report to the upstream router. The router then adds that group to the list of multicast groups that should be forwarded onto the local subnet. IGMP allows the device to inform the router that it is interested in receiving a particular multicast stream. When a host no longer wants to receive multicast traffic, it sends the router an IGMP Leave message.

If IGMP is enabled on your network and you want to broadcast across subnets, you must also set the Broadcast Uses IGMP property to TRUE on the badge. Enabling this property allows a badge to register its membership in the appropriate multicast group to receive multicast traffic from other badges, also from another subnet.

For more information, refer to Vocera Badge Configuration Guide.