3Com Switch 8800 Family Configuration Guide

444 CHAPTER 42: IGMP CONFIGURATION
■ 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.
IGMP Proxy
Configuration
Configuration prerequisites
■ IP addresses, PIM, pim neighbor-policy have been configured in the
corresponding interfaces of the devices in the exterior network.
■ 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.
Configuration procedure
c
CAUTION:
■ 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.
IGMP Configuration 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
■ Enabling IGMP on an interface
IGMP advanced configuration includes:
■ Enabling the compatibility control function of the switch
Tabl e 432 Configure IGMP Proxy
Operation Command Remarks
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