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Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
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Chapter34 Configuring IP Multicast Routi ng 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 recei ved 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 que ry resp onse time ad vertised i n IG MP
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 enab les the sw it ch t o prune gr ou ps
faster.
Beginning in privileged EXEC mode, follow these steps to change the maximu m qu er y respon se tim e.
This procedure is optional.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step3 no shutdown Enable the port, if necessary. By default, UNIs are disabled, and NNIs
are enabled.
Step4 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.
Step5 end Return to privileged EXEC mode.
Step6 show ip igmp interface [interface-id] Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify the interface to be configured, and enter interface configuration
mode.
Step3 no shutdown Enable the port, if necessary. By default, UNIs are disabled, and NNIs
are enabled.
Step4 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.