H3C Technologies H3C S7500E Series Switches - Manual (Page 125)

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To do... Use the command... Remarks
Configure the other querier
present interval
igmp timer
other-querier-present interval
Optional
By default, the other querier
present interval is [ IGMP
general query interval ] × [ IGMP
robustness variable ] +
[ maximum response time for
IGMP general queries ] / 2.
z Make sure that the other querier present interval is greater than the IGMP query interval;
otherwise the IGMP querier may change frequently on the network.
z Make sure that the IGMP query interval is greater than the maximum response time for
IGMP general queries; otherwise, multicast group members may be wrongly removed.
z 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
IGMP fast leave processing is implemented by IGMP Snooping. For details, refer to IGMP
Snooping Configuration in the IP Multicast Configuration Guide.
Configuring IGMP SSM Mapping
Due to some possible restrictions, some receiver hosts on an SSM network may run IGMPv1 or
IGMPv2. To provide SSM service support for these receiver hosts, you need to configure the
IGMP mapping feature on the last hop router.
Configuration Prerequisites
Before configuring the IGMP SSM mapping feature, complete the following tasks:
z Configure any unicast routing protocol so that all devices in the domain are interoperable at
the network layer.
z Configure basic functions of IGMP.
Enabling SSM Mapping
Follow these steps to enable the IGMP SSM mapping feature:
To do… Use the command… Remarks
Enter system view
system-view
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