Cisco Catalyst 3650 User Manual

Disabling Multicast Flooding During a TCN Event (CLI)
When the device receives a TCN, multicast traffic is flooded to all the ports until 2 general queries are received.
If the device 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 operation function.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface interface-id
4.
no ip igmp snooping tcn flood
5.
end
6.
show ip igmp snooping
7.
copy running-config startup-config
DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode.enable
Step 1
Example:
Device> enable
•
Enter your password if prompted.
Enters the global configuration mode.configure terminal
Example:
Device# configure terminal
Step 2
Specifies the interface to be configured, and enters interface
configuration mode.
interface interface-id
Example:
Device(config)# interface gigabitethernet
Step 3
1/0/1
Disables the flooding of multicast traffic during a
spanning-tree TCN event.
no ip igmp snooping tcn flood
Example:
Device(config-if)# no ip igmp snooping tcn
Step 4
By default, multicast flooding is enabled on an interface.
To re-enable multicast flooding on an interface, use
the ip igmp snooping tcn flood interface
configuration command.
Note
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
OL-29890-01 73
Configuring IGMP
How to Configure IGMP Snooping

Cisco Catalyst 3650 Specifications

General

Brand	Cisco
Model	Catalyst 3650
Category	Switch
Language	English