Cisco Catalyst 2960 Software Configuration Manual page 576
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Also See for Catalyst 2960:
- Configuration manual (2288 pages) ,
- Command reference manual (800 pages) ,
- Hardware installation manual (108 pages)
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Configuring IGMP Snooping
Command
Step 5
show ip igmp snooping
Step 6
copy running-config startup-config
To globally reset the IGMP leave timer to the default setting, use the no ip igmp snooping
last-member-query-interval global configuration command.
To remove the configured IGMP leave-time setting from the specified VLAN, use the no ip igmp
snooping vlan vlan-id last-member-query-interval global configuration command.
Configuring TCN-Related Commands
These sections describe how to control flooded multicast traffic during a TCN event:
•
•
•
Controlling the Multicast Flooding Time After a TCN Event
You can control the time that multicast traffic is flooded after a 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 until
7 general queries are received. Groups are relearned based on the general queries received during the
TCN event.
Beginning in privileged EXEC mode, follow these steps to configure the TCN flood query count:
Command
Step 1
configure terminal
Step 2
ip igmp snooping tcn flood query count
count
Step 3
end
Step 4
show ip igmp snooping
Step 5
copy running-config startup-config
To return to the default flooding query count, use the no ip igmp snooping tcn flood query count global
configuration command.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
21-12
Controlling the Multicast Flooding Time After a TCN Event, page 21-12
Recovering from Flood Mode, page 21-13
Disabling Multicast Flooding During a TCN Event, page 21-13
Purpose
(Optional) Display the configured IGMP leave time.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Specify the number of IGMP general queries for which the multicast
traffic is flooded. The range is 1 to 10. By default, the flooding query
count is 2.
Return to privileged EXEC mode.
Verify the TCN settings.
(Optional) Save your entries in the configuration file.
Chapter 21
Configuring IGMP Snooping and MVR
OL-26520-01
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