PurposeCommand or Action
Enters the global configuration mode.configure terminal
Example:
Device# configure terminal
Step 2
Specifies the number of IGMP general queries for which the
multicast traffic is flooded.
ip igmp snooping tcn flood query count count
Example:
Device(config)# ip igmp snooping tcn flood
Step 3
The range is 1 to 10. The default, the flooding query count is
2.
query count 3
To return to the default flooding query count, use the
no ip igmp snooping tcn flood query count global
configuration command.
Note
Returns to privileged EXEC mode.end
Example:
Device(config)# end
Step 4
Verifies the TCN settings.show ip igmp snooping
Example:
Device# show ip igmp snooping
Step 5
(Optional) Saves your entries in the configuration file.copy running-config startup-config
Example:
Device# copy running-config startup-config
Step 6
Recovering from Flood Mode (CLI)
When a topology change occurs, the spanning-tree root sends a special IGMP leave message (also known as
global leave) with the group multicast address 0.0.0.0. However, you can enable the device to send the global
leave message whether it is the spanning-tree root or not. When the router receives this special leave, it
immediately sends general queries, which expedite the process of recovering from the flood mode during the
TCN event. Leaves are always sent if the device is the spanning-tree root regardless of this configuration.
Follow these steps to enable sending of leave messages:
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
84 OL-32598-01
Configuring IGMP
How to Configure IGMP Snooping
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