Interlogix GE-DSSG-244, Руководство пользователя

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IFS NS3601-24P/4S GE-DSSG-244 and 244-POE User Manual
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Figure 4-8-7
IGMP Snooping VLAN Configuration page screenshot
The page includes the following fields:
Object Description
•
VLAN ID
The VLAN ID of the entry.
•
IGMP Snooping Enable
Enable the per-VLAN IGMP Snooping. Only up to 64 VLANs can be selected.
•
IGMP Querier
Enable the IGMP Querier in the VLAN. The Querier will send out if no Querier
received in 255 seconds after IGMP Querier Enabled. Each Querier's interval is
125 second, and it will stop act as an IGMP Querier if received any Querier from
other devices.
Buttons
: Refreshes the displayed table starting from the "VLAN" input fields.
: Updates the table starting from the first entry in the VLAN Table, i.e. the entry with the lowest VLAN ID.
: Updates the table, starting with the entry after the last entry currently displayed.
: Click to save changes.
: Click to undo any changes made locally and revert to previously saved values.
Port Group Filtering
In certain switch applications, the administrator may want to control the multicast services that are available to end users. For
example, an IP/TV service based on a specific subscription plan. The IGMP filtering feature fulfills this requirement by restricting
access to specified multicast services on a switch port, and IGMP throttling limits the number of simultaneous multicast groups a
port can join.
IGMP filtering enables you to assign a profile to a switch port that specifies multicast groups that are permitted or denied on the port.
An IGMP filter profile can contain one or more, or a range of multicast addresses; but only one profile can be assigned to a port.
When enabled, IGMP join reports received on the port are checked against the filter profile. If a requested multicast group is
permitted, the IGMP join report is forwarded as normal. If a requested multicast group is denied, the IGMP join report is dropped.
IGMP throttling sets a maximum number of multicast groups that a port can join at the same time. When the maximum number of
groups is reached on a port, the switch can take one of two actions; either “deny” or “replace”. If the action is set to deny, any new
IGMP join reports will be dropped. If the action is set to replace, the switch randomly removes an existing group and replaces it with
the new multicast group. The IGMP Snooping Port Group Filtering Configuration screen is shown
Figure 4-8-8 .