C
HAPTER
39
| Multicast Filtering Commands
IGMP (Layer 3)
– 940 –
RELATED COMMANDS
ip igmp version (943)
ip igmp query-interval (940)
ip igmp query-
interval
This command configures the frequency at which host query messages are
sent. Use the no form to restore the default.
SYNTAX
ip igmp query-interval seconds
no ip igmp query-interval
seconds - The frequency at which the switch sends IGMP host-query
messages. (Range: 1-255 seconds)
DEFAULT SETTING
125 seconds
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
â—† Multicast routers send host query messages to determine the interfaces
that are connected to downstream hosts requesting a specific multicast
service. Only the designated multicast router for a subnet sends host
query messages, which are addressed to the multicast address
224.0.0.1, and uses a time-to-live (TTL) value of 1.
â—† For IGMP Version 1, the designated router is elected according to the
multicast routing protocol that runs on the LAN. But for IGMP Version 2
and 3, the designated querier is the lowest IP-addressed multicast
router on the subnet.
EXAMPLE
The following shows how to configure the query interval to 100 seconds.
Console(config-if)#ip igmp query-interval 100
Console(config-if)#
RELATED COMMANDS
ip igmp max-resp-interval (939)
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