Configuring Timers; Configuring Fast Leave Processing - H3C S5100-SI Operation Manual

Before configuring related IGMP Snooping functions, you must enable IGMP Snooping in the
specified 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 section describes how to configure the aging timer of the router port, the aging timer of the
multicast member ports, and the query response timer.
Table 2-5 Configure timers
Operation
Enter system view
Configure the aging timer of the
router port
Configure the query response
timer
Configure the aging timer of the
multicast member port

Configuring Fast Leave Processing

With fast leave processing enabled, when the switch receives an IGMP leave message on a port, the
switch directly removes that port from the forwarding table entry for the specific group.
If only one host is attached to the port, enable fast leave processing helps improve bandwidth and
resource usage. If fast leave processing and unknown multicast packet dropping or non-flooding are
enabled on a port to which more than one host is connected, when one host leaves a multicast group,
the other hosts connected to port and interested in the same multicast group will fail to receive multicast
data for that group.
Enabling fast leave processing in system view
Table 2-6 Enable fast leave processing in system view
Operation
Enter system view
Enable fast leave processing
Command
system-view
igmp-snooping
router-aging-time seconds
igmp-snooping
max-response-time seconds
igmp-snooping
host-aging-time seconds
Command
system-view
igmp-snooping fast-leave
[ vlan vlan-list ]
2-6
Remarks
—
Optional
By default, the aging time of the
router port is 105 seconds.
Optional
By default, the query response
timeout time is 10 seconds.
Optional
By default, the aging time of
multicast member ports is 260
seconds
Remarks
—
Required
By default, the fast leave
processing feature is disabled.