3Com Switch 7750 Configuration Guide Guide

IGMP Snooping Configuration 391
■ 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.
If the IGMP fast leave feature is enabled, when receiving an IGMP Leave message,
the switch immediately removes the port from the multicast group. When a port
has only one user, enabling the IGMP fast leave feature on the port can save
bandwidth.
Enable the IGMP fast leave feature for all ports globally
Enable the fast leave feature for a port
Table 308 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
Table 309 Enable the IGMP fast leave feature for all ports globally
Operation Command Description
Enter system view system-view -
Enable the fast leave feature
from the multicast group of
the specific VLAN for all port
igmp-snooping fast-leave [
vlan vlan-list ]
Optional
By default, the fast leave
feature from a multicast
group for all ports is disabled.
Table 310 Enable the fast leave feature for a port
Operation Command Description
Enter system view system-view -
Enter Ethernet port view
interface interface-type
interface-number
-
Enable the fast leave feature
from the multicast group of
the specific VLAN for a port
igmp-snooping fast-leave [
vlan vlan-list ]
Optional
By default, the fast leave
feature from a multicast
group for a port is disabled.