27
Configuring parameters for IGMP general queries and
responses
CAUTION:
To avoid mistakenly deleting multicast group members, make sure the IGMP general query interval
is greater than the maximum response time for IGMP general queries.
You can modify the IGMP general query interval for a VLAN or VSI based on the actual condition of
the network.
A receiver host starts a report delay timer for each multicast group that it has joined when it receives
an IGMP general query. 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 corresponding multicast group.
Set an appropriate value for the maximum response time for IGMP general queries to speed up
hosts' responses to IGMP general queries and avoid IGMP report traffic bursts.
You can set the maximum response time for IGMP general queries globally for all VLANs and VSIs in
IGMP-snooping view, for a VSI in VSI view, or for a VLAN in VLAN view. For a VSI, the VSI-specific
configuration takes priority over the global configuration. For a VLAN, the VLAN-specific
configuration takes priority over the global configuration.
Configuring parameters for IGMP general queries and responses globally
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IGMP-snooping view.
igmp-snooping
N/A
3.
Set the maximum response
time for IGMP general
queries.
max-response-time seconds
The default setting is 10 seconds.
Configuring parameters for IGMP general queries and responses in a VLAN or VSI
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view or VSI
view.
•
Enter
VLAN
view:
vlan vlan-id
•
Enter
VSI
view:
vsi
vsi-name
N/A
3.
Set the IGMP general query
interval in the VLAN or VSI.
igmp-snooping query-interval
interval
The default setting is 125 seconds.
4.
Set the maximum response
time for IGMP general
queries in the VLAN or VSI.
igmp-snooping
max-response-time seconds
The default setting is 10 seconds.
Enabling IGMP snooping proxying
Before you enable IGMP snooping proxying for a VLAN, enable IGMP snooping for the VLAN.
To enable IGMP snooping proxying: