3Com Switch 7750 Configuration Guide

454 CHAPTER 46: IGMP CONFIGURATION
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 messages
The Layer 3 switch sends IGMP general query messages to the connected network
segment periodically to get to know which multicast groups in the network
segment have members according to the returned IGMP report messages. The
multicast router also sends query messages periodically. When it receives the IGMP
join messages of a group member, it will refresh the membership information of
the network segment.
Table 362 Configuration task overview
Operation Description Related section
Configure IGMP
version
Optional “Configuring IGMP Version” on page 454
Configure IGMP
query messages
Optional “Configuring IGMP Query Packets” on page 454
Configure IGMP
multicast groups on
the interface
Optional “Configuring IGMP Multicast Groups on the
Interface” on page 456
Configure IGMP
simulated joining
Optional “Configuring IGMP Simulated Joining” on page
458
Configure IGMP
Proxy
Optional “Configuring IGMP Proxy” on page 459
Configure
suppression on
IGMP host report
messages
Optional “Configuring Suppression on IGMP Host Report
Messages” on page 459
Remove the joined
IGMP groups from
the interface
Optional “Removing the Joined IGMP Groups from the
Interface” on page 460
Table 363 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.