CLI Reference Guide-R02

Chapter 23 | Multicast Filtering Commands
IGMP Snooping
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Example
Console(config)#ip igmp snooping router-alert-option-check
Console(config)#
ip igmp snooping
router-port-
expire-time
This command configures the querier timeout. Use the no form to restore the
default.
Syntax
ip igmp snooping router-port-expire-time seconds
no ip igmp snooping router-port-expire-time
seconds - The time the switch waits after the previous querier stops before
it considers it to have expired. (Range: 1-65535;
Recommended Range: 300-500)
Default Setting
300 seconds
Command Mode
Global Configuration
Example
The following shows how to configure the timeout to 400 seconds:
Console(config)#ip igmp snooping router-port-expire-time 400
Console(config)#
ip igmp snooping
tcn-flood
This command enables flooding of multicast traffic if a spanning tree topology
change notification (TCN) occurs. Use the no form to disable flooding.
Syntax
[no] ip igmp snooping tcn-flood
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
◆ When a spanning tree topology change occurs, the multicast membership
information learned by the switch may be out of date. For example, a host
linked to one port before the topology change (TC) may be moved to another
port after the change. To ensure that multicast data is delivered to all receivers,