3Com Switch 7750 Configuration Guide

432 CHAPTER 43: IGMP SNOOPING CONFIGURATION
c
CAUTION:
■ Before configuring the IGMP Snooping version, you must enable IGMP
Snooping in the VLAN.
■ Different multicast group addresses should be configured for different
multicast sources because IGMPv3 Snooping cannot distinguish multicast data
from different sources to the same multicast group.
Configuring Timers This configuration task is to manually configure the aging timer of the router port,
the aging timer of the multicast member ports, and the query response timer.
■ If the switch receives no general IGMP query message from a router within the
aging time of the router port, the switch removes the router port from the port
member lists of all MAC multicast groups.
■ If the switch receives no IGMP host report message, it sends an IGMP
group-specific query message to the port and enable the query response timer
of the IP multicast group.
■ If the switch receives no IGMP host report message within the aging time of
the member port, it sends IGMP group-specific query to the port and enables
the query response timer of the IP multicast group.
Enabling IGMP Fast
Leave for a Port or All
Ports
Normally, when receiving an IGMP Leave message, the switch does not
immediately remove the port from the multicast group, but sends an IGMP
group-specific query message. If no response is received in a given period, it then
removes the port from the multicast group.
Table 338 Configure the version of IGMP Snooping
Operation Command Description
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure the version of IGMP
Snooping
igmp-snooping version
version-number
Optional
The default IGMP Snooping
version is version 2.
Table 339 Configure timers
Operation Command Description
Enter system view system-view -
Configure the aging timer of
the router port
igmp-snooping
router-aging-time seconds
Optional
By default, the aging time of
the router port is 105
seconds.
Configure the query response
timer
igmp-snooping
max-response-time seconds
Optional
By default, the query response
timeout time is 10 seconds.
Configure the aging timer of
the multicast member port
igmp-snooping
host-aging-time seconds
Optional
By default, the aging time of
multicast member ports is 260
seconds