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Chapter 14
| Multicast Filtering
Filtering and Throttling MLD Groups
To clear MLD statistics:
1.
Click Multicast, MLD Snooping, Statistics.
2.
Select Clear.
3.
Select All or enter the required interface.
4.
Click Clear.
Figure 313: Clearing MLD Snooping Statistics
Filtering and Throttling MLD 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 MLD filtering feature fulfills this requirement by
restricting access to specified multicast services on a switch port, and MLD
throttling limits the number of simultaneous multicast groups a port can join.
MLD filtering enables you to assign a profile to a switch port that specifies multicast
groups that are permitted or denied on the port. An MLD 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, MLD join reports received on the port are
checked against the filter profile. If a requested multicast group is permitted, the
MLD join report is forwarded as normal. If a requested multicast group is denied,
the MLD join report is dropped.
MLD 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 i s set to
deny, any new MLD 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.