Configuring Igmp; Igmp Configuration Task List; Enabling Igmp - 3Com 5500-EI PWR Install Manual

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Enable multicast routing, and then enable PIM and IGMP on VLAN-interface 1 and VLAN-interface 2.

Run the igmp proxy command on VLAN-interface 1 to configure it as the proxy interface for

VLAN-interface 2.

Configure Switch A as follows:

Enable multicast routing, enable IGMP and PIM on VLAN-interface 1.

Configure the pim neighbor-policy command to filter PIM neighbors in the network segment

33.33.33.0/24. That is, Switch A does not consider Switch B as its PIM neighbor.

In this case, when Switch B of the stub network receives from VLAN-interface 2 an IGMP join or IGMP

leave message sent by the host, it changes the source address of the IGMP information to the address

of VLAN-interface 1, 33.33.33.2, and sends the information to VLAN-interface 1 of Switch A. For Switch

A, this works as if there is a host directly connected to VLAN-interface 1.

Similarly, when Switch B receives the IGMP general or group-specific query message from the Layer 3

Switch A, Switch B also changes the source address of the query message to the IP address of

VLAN-interface 2, 22.22.22.1, and send the message from VLAN-interface 2.