
Configuring IP Multicasting Services
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Estimating the Number of Groups
By default, IGMP estimates that 20 groups will be simultaneously active on a
router. You can use Site Manager to supply an estimate from 5 to 65,535 groups.
This estimate allows the router to utilize memory efficiently. Exceeding this size
during router operation will not cause an error, but may cause the router to
consume more memory than required.
Specifying a Version Threshold Time
By default, 540 seconds can elapse after IGMP detects a Version 1 query and
before it tries to become the designated querier. You can use Site Manager to
specify a version threshold time from 1 to 65535 seconds.
The value you specify should be greater than the Version 1 query rate of all IGMP
speakers on all networks directly connected to the router.
Configuring Logging
You can use Site Manager to specify the messages you want IGMP to log.
Site Manager: Estimated Groups parameter: page A-13
Note: The following groups are not maintained by IGMP; you do not need to
include them in the count: 224.0.0.1, 224.0.0.4, 224.0.0.5, and 224.0.0.6.
Site Manager: Version Threshold Time parameter: page A-13
Site Manager: Debug parameter: page A-14
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