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Viewing IGMP snooping information

To view information about IGMP snooping:


From the Device Manager menu bar, choose IP Routing > IGMP > Snoop.


The IGMP dialog box opens with the Snoop tab displayed.

The table below describes the Snoop tab fields.


Field Description
IInterface
The VLAN ID for the VLAN.
SnoopEnable
Enables (true) or disables (false) IGMP snooping. IGMP snooping works only when a multicast router exists in the VLAN.
ProxySnoopEnable
Indicates whether or not the IGMP report proxy feature is enabled. When this feature is enabled, reports are forwarded from hosts to the multicast router once per group per query interval or when there is new group information. When this feature is disabled, all reports from different hosts are forwarded to multicast routers, and more than one group report may be forwarded for the same multicast group per query interval. The default is enabled.
FastLeaveEnable
Enable or disable FastLeave for this port.
FastLeavePortMembers
The set of ports that are enabled for FastLeave.
SnoopMRouterPorts
Ports that have been configured as multicast router ports. Such ports are directly attached to a multicast router so the multicast data and group reports will be forwarded to the router.

Caution: Configure this field only when there are multiple multicast routers that are not directly attached to one another but are directly attached to the VLAN (technically an invalid configuration). If multicast routers have a route between them (the valid configuration) and this field is configured, a multicast loop will form.
SnoopActiveMRouter Ports
Active Multicast Router Ports are ports directly attached to a multicast router. These ports include the Querier port and all ports in the forwarding state that were configured by the user as well as those that were dynamically learned via receiving queries.
SnoopMRouterExpiration
Time remaining before the multicast router is aged out. If the switch does not receive any queries before this time expires, it flushes out all group memberships known to the VLAN. The Query Max Response Interval (obtained from the queries received) is used as the timer resolution.


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