Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
ip igmp query-interval
ip igmp query-i nterval
To configure the frequency that the swi tch sends the IGMP host-quer y messages, use the ip igmp
query-interval command. To return to the default frequency, use the no form of this command.
ip igmp query-interval seconds
no ip igmp query-interval
Syntax Description
Defaults T he qu ery interva l is set to 60 sec onds.
Command Modes Interface configuration mode
Usage Guidelines I f you use the default IGMP s nooping configurat ion, the valid query interva l values are from 1 to
65535 seconds. If you have changed the default conf iguration to support CGMP as the IGMP snooping
learning method, the valid query interval values are from 1 to 300 seconds.
The designated switch for a LAN is the only switch that sends the IGMP host-query messa ges. For IGMP
version 1, the designated switch is elected according to the multicast routing protocol that runs on the
LAN. For IGMP version 2, the designated querier is the lowest IP-addressed multicast switch on the
subnet.
If no queries are heard f or the t imeout per iod (c ontrolled by the ip igmp query-timeout command), the
switch becomes the querier.
Note Changing the timeout period may severely impact multicast forwarding.
Examples This exampl e shows how to change the frequen cy at which the designate d switch sends the IGMP
host-query messages:
Switch(config-if)# ip igmp query-interval 120
Switch(config-if)#
Related Commands
seconds Frequency, in seconds, at which the IGMP host-query messages are transmitted; valid
values depend on the IGMP snooping mode. See the “Usage Guidelines” section for more
information.
Command Description
ip igmp querier-timeout (refer to Cisco
IOS documentation)
Configures the timeout period before the router takes over
as the querier for the interface after the previous querier has
stopped querying.