Variable definitions

The following table describes the IGMP tab fields.

Field Description
QueryInterval The frequency (in seconds) at which IGMP host query packets are transmitted on the interface.
Ensure that the query interval is the same as the configured value on the multicast router (IGMP querier).
The range is from 1 to 65535, and the default is 125.
QueryMaxResponseTime The maximum response time (in 1/10 seconds) advertised in IGMPv2 general queries on this interface.
Robustness Specifies tuning for the expected packet loss of a network. This value is equal to the number of expected query packet losses for each serial query interval, plus 1. If you expect a network to lose query packets, you must increase the robustness value.
Ensure that the robustness value is the same as the configured value on the multicast router (IGMP querier).
The range is from 2 to 255, and the default is 2. The default value of 2 means that one query for each query interval can be dropped without the querier aging out.
LastMembQueryIntvl Specifies the maximum response time inserted into group-specific queries sent in response to leave group messages and is also the amount of time between group-specific query messages.
RouterAlertEnable When enabled, this parameter instructs the router to ignore IGMP packets that do not contain the router alert IP option. When disabled (default setting), the router processes IGMP packets regardless of whether the router alert IP option is set or not. To maximize your network performance, Nortel recommends that you set this parameter according to the version of IGMP currently in use: IGMPv1—Disable, IGMPv2—Enable, IGMPv3—Enable.
Version 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.
SnoopEnable Specifies the IGMP snoop status: enabled (true) or disabled (false).
ProxySnoopEnable Specifies the IGMP proxy status: enabled (true) or disabled (false).
SnoopMRouterPorts Specifies the statically-configured mrouter ports in the VLAN that provide connectivity to a nonquerier IP multicast router. Multicast data and group reports are forwarded out this port to the multicast router.
You do not need to configure this parameter if only one multicast router exists on the VLAN.