PurposeCommand or Action
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. Follow these steps to control TCN flooding:
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. Enter your password if
prompted.
enable
Example:
Device> enable
Step 1
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
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
86 OL-32598-01
Configuring IGMP
How to Configure IGMP Snooping
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