The Passport switch provides IP multicast capability when used as a switch. As a switch, it supports Internet Group Management Protocols IGMPv1 and IGMPv2 to prune group membership per port within a VLAN by reporting multicast group memberships to neighbor multicast routers. This feature is called IGMP snooping.

The IGMP snooping feature allows you to optimize the multicast data flow for a group within a VLAN only to those that are members of the group. The switch listens to group reports from each port and builds a database of multicast group members per port. It suppresses the reports heard by not forwarding them out to other hosts, forcing the members to continuously send their own reports. The switch relays group membership from the hosts to the multicast routers. It forwards queries from multicast routers to all port members of the VLAN. Furthermore, it multicasts data only to the participating group members and to the multicast routers within the VLAN.


Field	Description
Id	The VLAN ID for the VLAN.
Name	The name of the VLAN.
Enable	Enables (true) or disables (false) IGMP snooping. IGMP snooping works only when a multicast router exists in the VLAN.
ReportProxyEnable	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.
Robustness	The robust value (based on the network's tendency to lose data). This value, along with the query interval, is used to determine the group membership timeouts. It should be set to that of the multicast router in the network. If more than one multicast router is within a VLAN and the robust values are different, you should set the Passport routing switch to the highest value. The range is 1 to 255. The default is 2.
QueryInterval	In general, this value is the time between queries sent to the host, and is used to determine the multicast group membership timeouts. The real interval between queries is still dependent on the multicast router within the VLAN. You should set this value to be the same as that of the multicast routers in the VLAN. If there are multiple multicast routers on the net, you should select the highest query interval value. The query interval is in seconds (1 to 65535) with a default of 125 seconds.
MRouterPorts	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 each other 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.
ActiveMRouterPorts	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.
LastQuerier	The IP address of the last querier (multicast router) of this VLAN that was heard by the switch.
QuerierPort	The port on which the LastQuerier is being heard.
MRouterExpiration	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.

Snoop tab

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