31-30
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 31 Configuring IP Multicast Routing
Configuring Optional IGMP Features
Changing the IGMP Query Timeout for IGMPv2
If you are using IGMPv2, you can specify the period of time before the switch takes over as the querier
for the interface. By default, the switch waits twice the query interval controlled by the ip igmp
query-interval interface configuration command. After that time, if the switch has received no queries,
it becomes the querier.
You can configure the query interval by entering the show ip igmp interface interface-id privileged
EXEC command.
Beginning in privileged EXEC mode, follow these steps to change the IGMP query timeout. This
procedure is optional.
To return to the default setting, use the no ip igmp querier-timeout interface configuration command.
Changing the Maximum Query Response Time for IGMPv2
If you are using IGMPv2, you can change the maximum query response time advertised in IGMP
queries. The maximum query response time enables the switch to quickly detect that there are no more
directly connected group members on a LAN. Decreasing the value enables the switch to prune groups
faster.
Beginning in privileged EXEC mode, follow these steps to change the maximum query response time.
This procedure is optional.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step 3
ip igmp querier-timeout seconds Specify the IGMP query timeout.
The default is 60 seconds (twice the query interval). The range is 60
to 300.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip igmp interface [interface-id] Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to be configured, and enter interface configuration
mode.
Step 3
ip igmp query-max-response-time
seconds
Change the maximum query response time advertised in IGMP queries.
The default is 10 seconds. The range is 1 to 25.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip igmp interface [interface-id] Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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