User’s Manual of GS-5220 LCD Series
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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 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
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