| Device Online Help |
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Note:
The IGMP Interface option is not supported in Passport 1600 Series Layer 3 switch, Version 1.0. This feature will be supported with the availability of multicast routing with DVMRP.
Use the Interface tab to view or edit the IGMP interface table. When a particular interface does not have an IP address, its entry will not appear in the IGMP table. When an interface has an IP address, but DVMRP is not enabled, it is shown as "disable" in the Status field.
To view information about IGMP groups:
| The IGMP dialog box opens with the Snoop Globals tab displayed. |
| The IGMP Interface tab opens. |
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IfIndex
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The IP interface index (name) 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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Indicates whether IGMP is enabled or disabled on this IP interface. To change the status of IGMP on the interface, double-click in the field and select enable or disable.
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Version
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The version of IGMP (1 or 2) 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 seconds) advertised in IGMPv2 general queries on this interface.
Smaller values allow a router to prune groups faster. The range is from 0 to 255, and the default is 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 1 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 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.
Decreasing the value reduces the time to detect the loss of the last member of a group. The range is from 1 to 65535, and the default is 1 second. Nortel Networks recommends values above 1. |
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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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