24
Step Command Remarks
2. Enter VLAN view.
vlan vlan-id N/A
3. Enable IGMP snooping
querier.
igmp-snooping querier
Disabled by default
IMPORTANT:
In a multicast network that runs IGMP, you do not need to configure an IGMP snooping querier because
it may affect IGMP querier elections by sending IGMP general queries with a low source IP address.
Configuring parameters for IGMP queries and responses
CAUTION:
In the confi
er 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 in the
range of 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, you must properly set 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
Ste
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
Ste
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