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Cisco Catalyst Blade Switch 3030 Command Reference
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Chapter 2 Cisco Catalyst Blade Switch 3030 Cisco IOS Commands
ip igmp snooping tcn
ip igmp snooping tcn
Use the
ip igmp snooping tcn
global configuration
command to configure the Internet Group
Management Protocol (IGMP) Topology Change Notification (TCN) behavior. Use the
no
form of this
command to return to the default settings.
ip igmp snooping tcn
{
flood query count
count
|
query solicit
}
no ip igmp snooping tcn
{
flood query count
|
query solicit
}
Syntax Description
Defaults
The TCN flood query count is 2.
The TCN query solicitation is disabled.
Command Modes
Global configuration
Command History
Usage Guidelines
Use
ip igmp snooping tcn flood query count
global configuration command to control the time that
multicast traffic is flooded after a TCN event. 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 of multicast traffic due to the TCN event lasts until 7 general queries
are received. Groups are relearned based on the general queries received during the TCN event.
Use the
ip igmp snooping tcn query solicit
global configuration command to enable the switch to send
the global leave message whether or not it is the spanning-tree root. This command also speeds the
process of recovering from the flood mode caused during a TCN event.
Examples
This example shows how to specify 7 as the number of IGMP general queries for which the multicast
traffic is flooded:
Switch(config)#
no
ip igmp snooping tcn flood query count 7
You can verify your settings by entering the
show ip igmp snooping
privileged EXEC command.
flood query count
count
Specify the number of IGMP general queries for which the multicast traffic
is flooded. The range is 1 to 10.
query solicit
Send an IGMP leave message (global leave) to speed the process of
recovering from the flood mode caused during a TCN event.
Release
Modification
12.2(25)SEE
This command was introduced.