Cisco Catalyst 2960 Series, Configuration Manual

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Purpose Command or Action
Returns to privileged EXEC mode. end
Example:
Switch(config)#
end
Step 5
(Optional) Displays the configured IGMP leave time. show ip igmp snooping
Example:
Switch# show ip igmp snooping
Step 6
(Optional) Saves your entries in the configuration file. copy running-config startup-config
Example:
Switch#
copy running-config startup-config
Step 7
Related Topics
IGMP Configurable-Leave Timer, on page 121
Configuring TCN-Related Commands
Controlling the Multicast Flooding Time After a TCN Event
You can configure the number of general queries by which multicast data traffic is flooded after a topology
change notification (TCN) event. If you set the TCN flood query count to 1 the flooding stops after receiving
1 general query. If you set the count to 7, the flooding continues until 7 general queries are received. Groups
are relearned based on the general queries received during the TCN event.
Some examples of TCN events are when the client location is changed and the receiver is on same port that
was blocked but is now forwarding, and when a port goes down without sending a leave message.
Follow these steps to configure the TCN flood query count:
SUMMARY STEPS
1.
enable
2. configure terminal
3.
ip igmp snooping tcn flood query count count
4.
end
5. show ip igmp snooping
6.
copy running-config startup-config
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
138
How to Configure IGMP Snooping and MVR