Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

How to Configure IGMP Snooping and MVR
immediately sends general queries, which expedite the process of recovering from the flood mode during the
TCN event. Leaves are always sent if the switch is the spanning-tree root regardless of this configuration.
Follow these steps to enable sending of leave messages:
SUMMARY STEPS
1. enable
2. configure terminal
3. ip igmp snooping tcn query solicit
4. end
5. show ip igmp snooping
6. copy running-config startup-config
DETAILED STEPS
Command or Action
Step 1
enable
Example:
Switch> enable
Step 2 configure terminal
Example:
Switch# configure terminal
Step 3 ip igmp snooping tcn query solicit
Example:
Switch(config)# ip igmp snooping tcn query
solicit
Step 4
end
Example:
Switch(config)# end
Step 5 show ip igmp snooping
Example:
Switch# show ip igmp snooping

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

140
Purpose
Enables privileged EXEC mode. Enter your password if
prompted.
Enters the global configuration mode.
Sends an IGMP leave message (global leave) to speed the
process of recovering from the flood mode caused during a
TCN event. By default, query solicitation is disabled.
To return to the default query solicitation, use the no
Note
ip igmp snooping tcn query solicit global
configuration command.
Returns to privileged EXEC mode.
Verifies the TCN settings.