DGS-6604 ip igmp last-member-query-interval
CLI Reference Guide
268
ip igmp last-member-query-interval
Use this command to configure the interval at which the router sends IGMP
group-specific or group-source-specific (with IGMP Version 3) query messages.
The command sets the timer value for both IGMP L3 queries and IGMP
snooping.
ip igmp last-member-query-interval MILLISECONDS
Default 1000 milliseconds
Command Mode VLAN interface configuration
Usage Guideline When an IGMP querier receives a leave packet, it will send a group specific
query or group source specific query. The leave timer starts once the IGMP
querier receives a leave packet from an interface. If the interface does not
receive the report packet before the leave timer expires, then the interface’s
membership will be removed from the group or channel that is to be leaved. The
value of the leave timer is the value of the last-member-query-interval * the last-
member-query-count.
The IGMP last-member-query-interval will be carried within IGMP group-specific
queries or group-source-specific (with IGMP Version 3) query messages.
The last-member-query-count will have the same value as the robustness-
variable.
When IGMP is disabled but IGMP snooping is enabled at the interface, then the
IGMP last-member-query-interval value set with this command is used for IGMP
snooping. If the command “ip igmp snooping immediate-leave” on page 276
is enabled, then this timer value is ignored and the interface's group or channel
membership, identified in the leave request from the host, will be immediately
removed from the IGMP snooping membership table.
Example This example shows how to configure IGMP last member query interval value. It
configures IGMP last member query interval value to 2 seconds on interface
VLAN 1000.
Verify the settings by entering the show ip igmp interface command.
Syntax Description
MILLISECONDS Interval, in milliseconds, at which IGMP group-specific or group-source-specific
(with IGMP Version 3) query messages are sent. The range is 1000 to 25000.
Switch#configure terminal
Switch(config)# interface vlan1000
Switch(config-if)# ip igmp last-member-query-interval 2000
Switch(config-if)# end
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