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24-14
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 24 Configuring IGMP Snooping and MVR
Configuring IGMP Snooping
Beginning in privileged EXEC mode, follow these steps to enable the switch to send the global leave
message whether or not it is the spanning-tree root:
To return to the default query solicitation, use the no ip igmp snooping tcn query solicit global
configuration command.
Disabling Multicast Flooding During a TCN Event
When the switch receives a TCN, multicast traffic is flooded to all the ports until 2 general queries are
received. If the switch has many ports with attached hosts that are subscribed to different multicast
groups, this flooding might exceed the capacity of the link and cause packet loss. You can use the ip
igmp snooping tcn flood interface configuration command to control this behavior.
Beginning in privileged EXEC mode, follow these steps to disable multicast flooding on an interface:
To re-enable multicast flooding on an interface, use the ip igmp snooping tcn flood interface
configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip igmp snooping tcn query solicit Send 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.
Step 3
end Return to privileged EXEC mode.
Step 4
show ip igmp snooping Verify the TCN settings.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface
configuration mode.
Step 3
no ip igmp snooping tcn flood Disable the flooding of multicast traffic during a spanning-tree TCN
event.
By default, multicast flooding is enabled on an interface.
Step 4
exit Return to privileged EXEC mode.
Step 5
show ip igmp snooping Verify the TCN settings.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.