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Configure the startup query count
Configure the IGMP general
query interval
Configure the maximum response
time for IGMP general queries
Configure the IGMP last-member
query interval
Configure the other querier
present interval
CAUTION:
Make sure that 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 that 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 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
IGMP fast-leave processing is implemented by IGMP snooping. For more information, see the chapter
"IGMP snooping configuration."
Configuring IGMP SSM mapping
Because of some possible restrictions, some receiver hosts on an SSM network might run IGMPv1 or
IGMPv2. To provide SSM service support for these receiver hosts, configure the IGMP mapping feature
on the last-hop router.
Configuration prerequisites
Before you configure the IGMP SSM mapping feature, complete the following tasks:
Configure any unicast routing protocol so that all devices in the domain are interoperable at the
•
network layer
Configure basic functions of IGMP
•
Use the command...
igmp startup-query-count value
igmp timer query interval
igmp max-response-time interval
igmp last-member-query-interval
interval
igmp timer other-querier-present
interval
98
Remarks
Optional
By default, the startup query count
is set to the IGMP querier's
robustness variable.
Optional
60 seconds by default
Optional
10 seconds by default
Optional
1 second by default
Optional
By default, the other querier
present interval is [ IGMP general
query interval ] × [ IGMP
robustness variable ] + [
maximum response time for IGMP
general queries ] / 2.
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Troubleshooting
