Configuring The Igmp Leave Timer; Configuring Tcn-Related Commands - Cisco 3020 - Catalyst Blade Switch Configuration Manual

Chapter 18 Configuring IGMP Snooping and MVR
To disable IGMP Immediate Leave on a VLAN, use the no ip igmp snooping vlan vlan-id
immediate-leave global configuration command.
This example shows how to enable IGMP Immediate Leave on VLAN 130:
Switch# configure terminal
Switch(config)# ip igmp snooping vlan 130 immediate-leave
Switch(config)# end

Configuring the IGMP Leave Timer

Follows these guidelines when configuring the IGMP leave timer:
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Beginning in privileged EXEC mode, follow these steps to enable the IGMP configurable-leave timer:
Command
Step 1 configure terminal
Step 2
ip igmp snooping
last-member-query-interval time
Step 3
ip igmp snooping vlan vlan-id
last-member-query-interval time
Step 4
end
Step 5 show ip igmp snooping
Step 6 copy running-config startup-config
To globally reset the IGMP leave timer to the default setting, use the no ip igmp snooping
last-member-query-interval global configuration command.
To remove the configured IGMP leave-time setting from the specified VLAN, use the no ip igmp
snooping vlan vlan-id last-member-query-interval global configuration command.

Configuring TCN-Related Commands

These sections describe how to control flooded multicast traffic during a TCN event:
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OL-8915-01
You can configure the leave time globally or on a per-VLAN basis.
Configuring the leave time on a VLAN overrides the global setting.
The default leave time is 1000 milliseconds.
The IGMP configurable leave time is only supported on hosts running IGMP Version 2.
The actual leave latency in the network is usually the configured leave time. However, the leave time
might vary around the configured time, depending on real-time CPU load conditions, network delays
and the amount of traffic sent through the interface.
Controlling the Multicast Flooding Time After a TCN Event, page 18-12
Recovering from Flood Mode, page 18-12
Disabling Multicast Flooding During a TCN Event, page 18-13
Purpose
Enter global configuration mode.
Configure the IGMP leave timer globally. The range is 100 to 5000
milliseconds. The default is 1000 seconds.
(Optional) Configure the IGMP leave time on the VLAN interface. The
range is 100 to 5000 milliseconds.
Note Configuring the leave time on a VLAN overrides the globally
configured timer.
Return to privileged EXEC mode.
(Optional) Display the configured IGMP leave time.
(Optional) Save your entries in the configuration file.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring IGMP Snooping
18-11