Configuring Parameters For Igmp Queries And Responses - HP 6125G Configuration Manual

Step
2. Enter VLAN view.
3. Enable IGMP snooping
querier.
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 configuration, make sure that 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 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
Step
1. Enter system view.
2. Enter IGMP-snooping view.
3. Set the maximum response
delay for IGMP general
queries.
4. Set the IGMP last-member
query interval.
Configuring the parameters for IGMP queries and responses in a VLAN
Step
1. Enter system view.
2. Enter VLAN view.
3. Set the interval for sending
IGMP general queries.
Command
vlan vlan-id
igmp-snooping querier
Command
system-view
igmp-snooping
max-response-time interval
last-member-query-interval interval
Command
system-view
vlan vlan-id
igmp-snooping query-interval interval
24
Remarks
N/A
Disabled by default
Remarks
N/A
N/A
10 seconds by default
1 second by default
Remarks
N/A
N/A
60 seconds by default