Configuring Igmp Prompt Leave - Huawei Quidway S7700 Configuration Manual - Multicast

Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast
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4.4.5 Configuring IGMP Prompt Leave

Context
After receiving a Leave message from a host, the querier reports the message to the upstream
router instead of sending a Last Member Query message. This process is called IGMP prompt
leave. In this manner, the delay in response is reduced and the bandwidth occupied by various
messages is saved.
Issue 01 (2011-07-15)
– When receiving a Leave message, the S7700 sends IGMP Group-Specific Query
messages for the time specified by the value of the robustness variable at the
interval that you set.
By default, the robustness variable is 2.
5. Run:
igmp max-response-time interval
The maximum response time for IGMP Query messages is set.
By default, the maximum response time for an IGMP Query message is 10 seconds.
6. Run:
igmp timer other-querier-present interval
The Keepalive period of other IGMP queriers is set.
By default, Keepalive period of other IGMP queriers = Robustness variable x Interval
for sending General Query messages + Maximum response time x 1/2. When the
values of the parameters to the right of the equal mark are the default values, the
Keepalive period of other IGMP queriers is 125 seconds.
7. Run:
igmp lastmember-queryinterval interval
The interval at which the S7700 sends IGMP Group-Specific Query messages is set.
By default, the interval for sending IGMP Group-Specific Query messages is 1 second.
8. Run:
igmp on-demand
The (S, G) entry never times out. The interface does not send IGMP Query messages.
By default, the interface sends Query messages and participates in querier election.
NOTE
Both IGMPv2 and IGMPv3 support the igmp on-demand command.
NOTE
l IGMP prompt leave is applicable only to IGMPv2.
l When the IGMP version is IGMPv1 or IGMPv3, the IGMP prompt leave does not take effect even
if there is information about this function in current configuration.
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