R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

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To do... Use the command... Remarks
Configure the other querier present
interval
igmp timer other-querier-present
interval
Optional
For the system default, see the note
below.
NOTE:
• If not statically configured, the startup query interval is 1/4 of the “IGMP query interval”. By default, the
IGMP query interval is 60 seconds, so the startup query interval = 60 / 4 = 15 (seconds).
• If not statically configured, the startup query count is set to the IGMP querier robustness variable. By
default, the IGMP querier robustness variable is 2, so the startup query count is also 2.
• If not statically configured, the other querier present interval is [ IGMP query interval ] times [ IGMP
robustness variable ] plus [ maximum response time for IGMP general queries ] divided by two. The
default values of these three parameters are 60 (seconds), 2 and 10 (seconds) respectively, so the other
querier present interval = 60 × 2 + 10 / 2 = 125 (seconds).
• If statically configured, the startup query interval, the startup query count, and the other querier presen
t
interval take the configured values.
CAUTION:
• Make sure that the other querier present interval is
g
reater than the IGMP query interval; otherwise the
IGMP querier may change frequently on the network.
• Make sure that the IGMP query interval is
g
reater than the maximum response time for IGMP
g
eneral
queries; otherwise, multicast group members may 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 or 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.
Thus, the leave latency is reduced on one hand, and the network bandwidth is saved on the other hand.
1. Configuring IGMP fast-leave processing globally
Follow these steps to configure IGMP fast-leave processing globally:
To do... Use the command... Remarks
Enter system view system-view —
Enter public instance IGMP view igmp —
Configure IGMP fast-leave
processing
fast-leave [ group-policy
acl-number ]
Required
Disabled by default
2. Configuring IGMP fast-leave processing on an interface
Follow these steps to configure IGMP fast-leave processing on an interface: