H3C Technologies H3C SecPath F1000-E - Manual (Page 615)

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Step Command Remarks
5. Configure the startup query count. igmp startup-query-count value
By default, the startup query
count is set to the IGMP
querier’s robustness variable.
6. Configure the IGMP general
query interval.
igmp timer query interval 60 seconds by default.
7. Configure the maximum response
time for IGMP general queries.
igmp max-response-time interval 10 seconds by default.
8. Configure the IGMP last member
query interval. igmp last-member-query-interval
interval
1 second by default.
9. Configure the other querier
present interval. igmp timer other-querier-present
interval
By default, the other querier
present interval is [ IGMP
general query interval ] ×
[ IGMP robustness variable ] +
[ maximum response time for
IGMP general queries ] / 2.
CAUTION:
•
Make sure the other querier present interval is greater than the IGMP general query interval. Otherwise
the IGMP querier might change frequently on the network.
• Make sure the IGMP general query interval is greater than the maximum response time for IGMP
general queries. Otherwise, multicast group members might be wrongly removed.
• The configurations of the maximum response time for IGMP general queries, the IGMP last member
query interval and the IGMP other querier present interval are effective only for IGMPv2 and IGMPv3.
Configuring IGMP fast leave processing
In some applications, such as ADSL dial-up networking, only one multicast receiver host is attached to a
port of the IGMP querier. To allow fast response to the leave messages of the host when it switches
frequently from one multicast group to another, you can enable IGMP fast leave processing on the IGMP
querier.
With fast leave processing enabled, after receiving an IGMP leave message from a host, the IGMP
querier directly sends a leave notification to the upstream without sending IGMP group-specific queries
or IGMP group-and-source-specific queries. Thus, the leave latency is reduced on one hand, and the
network bandwidth is saved on the other hand.
To configure IGMP fast leave processing globally:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter public network IGMP view. igmp N/A
3. Configure IGMP fast leave
processing.
fast-leave [ group-policy acl-number ] Disabled by default
To configure IGMP fast leave processing on an interface:
Step Command Remarks
1. Enter system view. system-view N/A