26
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan
vlan-id
N/A
3.
Enable the IGMP snooping
querier in the VLAN.
igmp-snooping
querier
Disabled by default.
Configuring parameters for IGMP queries and responses
CAUTION:
In the configuration, make sure the IGMP general query interval is larger than the maximum
response delay for IGMP general queries. Otherwise, multicast group members might be deleted by
mistake.
You can modify the IGMP general query interval based on actual condition of the network.
A multicast listening host starts a timer for each multicast group that it has joined when it receives an
IGMP query (general query or group-specific query). This timer is initialized to a random value
ranging from 0 to the maximum response delay advertised in the IGMP query message. When the
timer value decreases to 0, the host sends an IGMP report to the multicast group.
To speed up the response of hosts to IGMP queries and avoid simultaneous timer expirations
causing IGMP report traffic bursts, set a proper value for the maximum response delay:
•
The maximum response delay for IGMP general queries is set by the
max-response-time
command.
•
The maximum response delay for IGMP group-specific queries equals the IGMP last-member
query interval.
Configuring the global parameters for IGMP queries and responses
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
delay for IGMP general
queries.
max-response-time
interval
10 seconds by default.
4.
Set the IGMP last-member
query interval.
last-member-query-interval
interval
1 second by default.
Configuring the parameters for IGMP queries and responses 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 interval for sending
IGMP general queries.
igmp-snooping query-interval
interval
60 seconds by default.
4.
Set the maximum response
delay for IGMP general
queries.
igmp-snooping max-response-time
interval
10 seconds by default.
5.
Set the IGMP last-member
igmp-snooping
1 second by default.
