Configuring Timers; Configuring Fast Leave Processing - 3Com 4500 Configuration Manual

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.
Follow these steps to configure timers:
To do...
Enter system view
Configure the aging timer of the
router port
Configure the general 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 to improve bandwidth management.
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
Follow these steps to enable fast leave processing in system view:
To do...
Enter system view
Enable fast leave processing
Enabling fast leave processing in Ethernet port view
Follow these steps to enable fast leave processing in Ethernet view:
To do...
Enter system view
Use the command...
system-view
igmp-snooping
router-aging-time seconds
igmp-snooping
max-response-time seconds
igmp-snooping
host-aging-time seconds
Use the command...
system-view
igmp-snooping fast-leave
[ vlan vlan-list ]
Use the command...
system-view
1-7
Remarks
—
Optional
By default, the aging time of the
router port is 105 seconds.
Optional
By default, the general 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.
Remarks
—