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Multicast Filtering Commands
4-231
4
Command Usage
• 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.
• 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, 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:
ip igmp max-resp-interval
This command configures the maximum response time advertised in IGMP queries.
Use the no form of this command to restore the default.
Syntax
ip igmp max-resp-interval seconds
no ip igmp max-resp-interval
seconds - The report delay advertised in IGMP queries. (Range: 1-255)
Default Setting
10 seconds
Command Mode
Interface Configuration (VLAN)
Command Usage
• The switch must be using IGMPv2 for this command to take effect.
• This command defines how long any responder (i.e., client or router) still in the
group has to respond to a query message before the router deletes the group.
• By varying the Maximum Response Interval, you can tune the burstiness of
IGMP messages passed on the subnet; where larger values make the traffic
less bursty, as host responses are spread out over a larger interval.
• The number of seconds represented by the maximum response interval must
be less than the Query Interval (page 4-230).
Example
The following shows how to configure the maximum response time to 20 seconds:
Console(config-if)#ip igmp query-interval 100
Console(config-if)#
Console(config-if)#ip igmp max-resp-interval 20
Console(config-if)#