Planet IGS-10020, Руководство пользователя

Страница: 190 / 409

User’s Manual
190
4.8.6 IGMP Snooping 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 is 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 in Figure 4-8-9 appears.
Figure 4-8-9:
IGMP Snooping Port Filtering Profile Configuration page Screenshot
The page includes the following fields:
Object Description
•
Port
The logical port for the settings.
•
Filtering Profile
Select the IPMC Profile as the filtering condition for the specific port. Summary
about the designated profile will be shown by clicking the view button
Buttons
: Click to apply changes
: Click to undo any changes made locally and revert to previously saved values.