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IfIndex
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The interface on which IGMP is enabled.
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QueryInterval
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The frequency (in seconds) at which IGMP host query packets are transmitted on the interface. The range is from 1 to 65535, and the default is 125.
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Status
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The IGMP row status. When an interface has an IP address and DVMRP is enabled, status is shown as enable. Otherwise, it will be shown as disable.
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Version
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The version of IGMP (1, 2 or 3) that you want to configure on this interface. For IGMP to function correctly, all routers on a LAN must use the same version. The default is
version 2.
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Querier
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The address of the IGMP querier on the IP subnet to which this interface is attached.
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QueryMaxResponseTime
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The maximum response time (in 1/10 seconds) advertised in IGMPv2 general queries on this interface. This value is not configurable for IGMPv1.
Smaller values allow a router to prune groups faster. The range is from 0 to 255, and the default is 100 tenth seconds (equal to 10 seconds).
Note: This value must be less than the QueryInterval.
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WrongVersionQueries
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The number of queries received with an IGMP version that does not match the interface. IGMP requires that all routers on a LAN be configured to run the same version of IGMP. If any queries are received with the wrong version, it indicates a version mismatch.
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Joins
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The number of times a group membership has been added on this interface; that is, the number of times an entry for this interface has been added to the cache table. This number gives an indication of the amount of IGMP activity over time.
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Robustness
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This parameter allows tuning for the expected packet loss of a network. This value is equal to the number of expected query packet losses per serial query interval, plus 1. If a network is expected to lose query packets, the robustness value should be increased.
The range is from 2 to 255, and the default is 2. The default value of 2 means that one query per query interval may be dropped without the querier aging out.
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LastMembQueryIntvl
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The maximum response time (in 1/10 seconds) that is inserted into group-specific queries sent in response to leave group messages. It is also the time between group-specific query messages. This value is not configurable for IGMPv1.
Decreasing the value reduces the time to detect the loss of the last member of a group. The range is from 0 to 255, and the default is 10 tenth seconds. Nortel Networks recommends configuring this parameter to values higher than 3. If a fast leave process is not required, Nortel recommends values above 10. (The value 3 is equal to 0.3 of a second and 10 is equal to 1.0 second).
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QuerierUpTime
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The time since the querier was last changed.
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QuerierExpiryTime
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The amount of time remaining before the other querier present timer expires. If the local system is the querier, the value of this object is zero.
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Version1QuerierTimer
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The time remaining until the host assumes that there are no IGMP version 1 routers on the interface. While this is non zero, the host will reply to all queries with version 1 membership reports.
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Groups
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The current number of entries for IGMP in the cache table.
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