3com 8807 User Guide

C

HAPTER

 42: IGMP C

ONFIGURATION

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Switch A processes the message after receiving the IGMP message sent by 
Switch B through the interface of VLAN 100, just as the message is sent by a 
host directly connected to the interface of VLAN 100.

The procedures to process IGMP normal group or specific group querying 
messages are as follows:

■

After receiving a normal group or a specific group querying message from 
Switch A, Switch B changes the source address of the querying message to the 
address of the outbound interface leading to hosts.

■

Switch B transmits the message through the interface of VLAN 200.

■

IP addresses, PIM, pim neighbor-policy have been configured in the 
corresponding interfaces of the devices in the exterior network.

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The switches in the leaf networks are multicast-enabled. The related ports are 
added to specific VLANs. IP addresses, PIM, and IGMP have been configured in 
the corresponding interfaces.

c 

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Enable PIM protocol on the interface first before configuring IGMP Proxy.

■

If you configure IGMP Proxy for an interface multiple times, the latest 
configuration is valid.

■

One interface cannot be the IGMP proxy interface of two or more other 
interfaces simultaneously.

After the multicast function is enabled, you must enable IGMP on the interface 
first and then perform other IGMP configurations.

IGMP basic configuration includes:

■

Enabling multicast

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Enabling IGMP on an interface

IGMP advanced configuration includes:

■

Enabling the compatibility control function of the switch

Table 432   Configure IGMP Proxy

Enter system view 

system-view 

- 

Enter interface view 

interface interface-type 
interface-number 

- 

Enable IGMP Proxy on the 
current interface and specify 
the proxy interface for the 
current interface 

igmp proxy interface-type 
interface-number 

Required

By default, IGNP Proxy is 
disabled on the interface