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Viewing IGMP snoop control data

The IGMP Snoop Control tab shows the control informant of IGMP snooping for the interfaces on the switch. It contains IGMP snooping timers and other IGMP parameters that can be configured and viewed using this tab. This information is sorted per interface.

To view IGMP snoop control data:

  1. From the Device Manager menu bar, choose IP Routing > IGMP.
  2. The IGMP dialog box opens with the Snoop Globals tab displayed.
  3. Click the Snoop Control tab.
  4. The Snoop Control tab opens.

The following table describes the fields in the Snoop Control tab.


Field Description
VlanName
Specifies the name of the IGMP VLAN.
QueryInterval
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.
MaxResponseTime
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 100 tenth seconds.
Note: This value must be less than the QueryInterval.
Robustness
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.
LastMemberQueryInterval
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 recommends values above 1.
HostTimeout
The timer value for sending IGMP query packet when none was sent by the host in the LAN. The timer works on a per-VLAN basis. The device will send the query message if the timer is expired. The range is 1 to 16711450 with a default value of 260.
RouteTimeout
The amount of time a host must wait after hearing a Query before it sends any IGMPv2 messages. The default value is 260. The range is from 1 to 16711450 seconds.
LeaveTimer
The frequency (in seconds) at which a querier sends Group specific queries to group members when the querier receives a leave group message. The range is from 1 to 16711450 with a default value of 1.
QueryState
The current operational state of the IGMP query (enabled or disabled).
CurrentState
The current state of the IGMP (querier or non-querier).
IGMPSnoopingState
The current state of IGMP snoop (disabled or enabled) for this entry. To enable or disable the current state, click on the field and a selection box appears with the enable and disable options.

See also:


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