3Com Switch 7750 Configuration Guide Guide

IGMP Configuration Tasks 411
Similarly, when Switch B receives the IGMP general group or group-specific query
message from the Layer 3 Switch A, it will also change 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.
In Figure 96, VLAN interface 2 of Switch B is called the client and VLAN interface 1
of Switch B is called the proxy.
IGMP Configuration
Tasks
Configuring IGMP
Version
c
CAUTION: Each IGMP version cannot be switched to each other automatically. So
all the Layer 3 switches on a subnet must be configured to use the same IGMP
version.
Configuring IGMP Query
Packets
IGMP general query packets
The Layer 3 switch sends IGMP general query packets to the connected network
segment periodically to get to know which multicast groups in the network
Table 328 Configuration task overview
Operation Description Related section
Configure IGMP version Optional “Configuring IGMP Version”
Configure IGMP query
messages
Optional
“Configuring IGMP Query
Packets”
Configure IGMP multicast
groups on the interface
Optional
“Configuring IGMP Multicast
Groups on the Interface”
Configure router ports to join
the specified multicast group
Optional
“Configuring Router Ports to
Join the Specified Multicast
Group”
Configure IGMP Proxy Optional “Configuring IGMP Proxy”
Configure suppression on
IGMP host report packets
Optional
“Configuring Suppression on
IGMP Host Report Packet”
Remove the joined IGMP
groups from the interface
Optional
“Removing the Joined IGMP
Groups from the Interface”
Table 329 Configure IGMP version
Operation Command Description
Enter system view system-view -
Enable the multicast routing
protocol
multicast routing-enable
Enable the multicast routing
protocol
Enter VLAN interface view
interface vlan-interface
interface-number
-
Enable IGMP on the current
interface
igmp enable
Required
By default, if IP multicast
routing is enabled globally,
IGMP is enabled on all the
layer-3 interfaces
automatically.
Configure the IGMP version of
the Layer 3 switch (router)
igmp version { 1 | 2 }
Optional
IGMP version 2 is used by
default.