IGMP Support on Extreme Networks Devices

Extreme Networks devices implement IGMP version 2 (RFC 2236) and IGMP version 3 (RFC 3376), which includes interoperability with version 1 hosts. IGMP version 1 is defined in RFC 1112.

Depending on your Extreme Networks device, IGMP can be configured independently at the switch level (Layer 2) and at the router level (Layer 3).

Extreme Networks devices support IGMP as follows:

• Passively snooping on the IGMP query and IGMP report packets transferred between IP multicast switches and IP multicast host groups to learn IP multicast group members. Each Layer 2 device records which ports IGMP packets are received on, depending on the kind of IGMP message, so multicast data traffic is not flooded across every port on the VLAN when it is received by the switch.

  IGMP querying is disabled by default, use set igmp query-enable command to enable IGMP querying as described in .

• Actively sending IGMP query messages to learn locations of multicast switches and member hosts in multicast groups within each VLAN.
• Configuration of static IGMP groups which provides for specifying the IP address (group address) and VLAN of a non-IGMP capable device, forcing the sending of multicast traffic to the device. You can configure a static IGMP group using the set igmp static command as described in .