Setting the IGMP last member query interval
A receiver host starts a report delay timer for a multicast group when it receives an IGMP group-specific query for the group. This timer is set to a random value in the range of 0 to the maximum response time advertised in the query. When the timer value decreases to 0, the host sends an IGMP report to the group.
The IGMP last member query interval defines the maximum response time advertised in IGMP group-specific queries. Set an appropriate value for the IGMP last member query interval to speed up hosts' responses to IGMP group-specific queries and avoid IGMP report traffic bursts.
Configuration restrictions and guidelines
When you set the IGMP last member query interval, follow these restrictions and guidelines:
If the Layer 2 device receives a leave message from a port enabled with fast-leave processing, the device does not send an IGMP group-specific query to the port.
You can set the IGMP last member query interval globally for all VLANs in IGMP-snooping view or for a VLAN in VLAN view. For a VLAN, the VLAN-specific configuration takes priority over the global configuration.
Setting the IGMP last member query interval globally
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter IGMP-snooping view. | igmp-snooping | N/A |
3. Set the IGMP last member query interval globally. | last-member-query-interval interval | The default setting is 1 second. |
Setting the IGMP last member query interval in a VLAN
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter VLAN view. | vlan vlan-id | N/A |
3. Set the IGMP last member query interval in the VLAN. | igmp-snooping last-member-query-interval interval | The default setting is 1 second. |