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The Interface tab displays statistics about the L3-IGMP interfaces used.
The table below describes the fields in the Interface tab.
Interface
Interface on which IGMP is enabled.
QueryInterval(sec)
Frequency (in seconds) at which IGMP host query packets are transmitted on the interface. The range is from 1 to 65535. The default is 125.
Status
IGMP row status. When an interface has been assigned an IP address and DVMRP is enabled, status is shown as active. Otherwise, it is shown as notInService.
Version
Version of IGMP that is configured on the interface. For IGMP to function correctly, all routers on a LAN must be configured to run the same version of IGMP on that LAN.
Querier
Address of the IGMP querier on the IP subnet to which the interface is attached.
QueryMax
ResponseTime(sec)
Maximum response time (in seconds) advertised in IGMPv2 general queries on this interface. Smaller values allow a router to prune groups faster. This value for IGMPv1 is not configurable and has a default value of 10 seconds.
WrongVersion
Queries
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.
Joins
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.
Robustness
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, increase the robustness value. The range is from 2 to 255 with a default value of 2. The default value of 2 means that one query per query interval may be dropped without the querier aging out.
LastMemQueryIntval
Maximum response time inserted into group-specific queries sent in response to leave group messages; also the time between group-specific query messages. Increasing this parameter increases the time before aging hosts on the network. It also increases the number of retransmits of group-specific queries. The range is from 1 to 255. The default value is 1.
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