M
ULTICAST
F
ILTERING
3-217
IGMP filtering enables you to assign a profile to a switch port that
specifies multcast 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.
Note: IGMP filtering and throttling only applies to dynamically learned
multicast groups, it does not apply to statically configured groups.
Configuring IGMP Profile Group
When you have created an IGMP profile number, you can then configure
the multicast groups to filter and set the access mode.
Command Usage
• Each profile has only one access mode; either permit or deny.
• When the access mode is set to permit, IGMP join reports are
processed when a multicast group falls within the controlled range.
When the access mode is set to deny, IGMP join reports are only
processed when a multicast group is not in the controlled range.
Command Attributes
• Profile ID – Selects an existing profile number to configure. After
selecting an ID number, click the Query button to display the current
configuration.
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