PurposeCommand or Action
(Optional) Displays the configured IGMP last member query
count.
show ip igmp snooping
Example:
Device# show ip igmp snooping
Step 6
(Optional) Saves your entries in the configuration file.copy running-config startup-config
Example:
Device# copy running-config startup-config
Step 7
Configuring TCN-Related Commands
Controlling the Multicast Flooding Time After a TCN Event (CLI)
You can control the time that multicast traffic is flooded after a topology change notification (TCN) event by
using the ip igmp snooping tcn flood query count global configuration command. This command configures
the number of general queries for which multicast data traffic is flooded after a TCN event. Some examples
of TCN events are when the client changed its location and the receiver is on same port that was blocked but
is now forwarding, and when a port went down without sending a leave message.
If you set the TCN flood query count to 1 by using the ip igmp snooping tcn flood query count command,
the flooding stops after receiving 1 general query. If you set the count to 7, the flooding continues until 7
general queries are received. Groups are relearned based on the general queries received during the TCN
event.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
ip igmp snooping tcn flood query count count
4.
end
5.
show ip igmp snooping
6.
copy running-config startup-config
DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode.enable
Step 1
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
70 OL-29890-01
Configuring IGMP
How to Configure IGMP Snooping
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