24-12
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 24 Configuring IGMP Snooping and MVR
Configuring IGMP Snooping
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:
•
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.
Beginning in privileged EXEC mode, follow these steps to enable the IGMP configurable-leave timer:
To globally reset the IGMP leave timer to the default setting, use the
no ip igmp snooping
last-member-query-interva
l 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:
•
Controlling the Multicast Flooding Time After a TCN Event, page 24-13
•
Recovering from Flood Mode, page 24-13
•
Disabling Multicast Flooding During a TCN Event, page 24-14
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
ip igmp snooping
last-member-query-interval
time
Configure the IGMP leave timer globally. The range is 100 to
32768 milliseconds. The default is 1000 seconds.
Step 3
ip igmp snooping vlan
vlan-id
last-member-query-interval
time
(Optional) Configure the IGMP leave time on the VLAN interface. The
range is 100 to 32768 milliseconds.
Note
Configuring the leave time on a VLAN overrides the globally
configured timer.
Step 4
end
Return to privileged EXEC mode.
Step 5
show ip igmp snooping
(Optional) Display the configured IGMP leave time.
Step 6
copy running-config startup-config
(Optional) Save your entries in the configuration file.