Web Management Guide-R03

Chapter 16 | Multicast Filtering
Filtering and Throttling IGMP Groups
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Filtering and Throttling IGMP Groups
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 addresses, 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.
Enabling IGMP
Filtering and
Throttling
Use the Multicast > IGMP Snooping > Filter (Configure General) page to enable
IGMP filtering and throttling globally on the switch.
Parameters
These parameters are displayed:
◆ IGMP Filter Status – Enables IGMP filtering and throttling globally for the
switch. (Default: Disabled)
Web Interface
To enable IGMP filtering and throttling on the switch:
1. Click Multicast, IGMP Snooping, Filter.
2. Select Configure General from the Step list.
3. Enable IGMP Filter Status.
4. Click Apply.