Multicast Filtering Commands
4-239
4
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 rout er 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 4-238).
Example
The following shows how to configure the maximum res ponse time to 20 seconds:
Related Commands
ip igmp version (4-240)
ip igmp query-interval (4-238)
ip igmp last-memb-query-interval
This command configures the last member query interval. Use the no form of this
command to restore the default.
Syntax
ip igmp last-memb-query-interval seconds
no ip igmp last-memb-query-interval
seconds - The report delay for the last member query. (Range: 1-255)
Default Setting
1 second
Command Mode
Interface Configuration (VLAN)
Command Usage
• A multicast client sends an IGMP leave message when it l eaves a group. The
router then checks to see if this was the last host in the group by sending an
IGMP query and starting a timer based on this command. If no reports are
received before the timer expires, the group is deleted.
• This value may be tuned to modify the leave latency of the network. A reduced
value results in reduced time to detect the loss of the last memb er of a group.
Example
The following shows how to configure the maximum res ponse time to 10 seconds:
Console(config-if)#ip igmp max-resp-interval 20
Console(config-if)#
Console(config-if)#ip igmp last-memb-query-interval 10
Console(config-if)#