To set the maximum number of MLD groups that an interface can join or to configure the MLD throttling action when the maximum
number of entries in the forwarding table is reached, use the ipv6 mld max-groups Interface Configuration mode command.
To set the maximum back to the default setting, which is to have no maximum limit, or to return to the default throttling
action, which is to drop the report, use the no form of this command.
Syntax
ipv6 mld max-groups number
no ipv6 mld max-groups number
ipv6 mld max-groups action {deny | replace}
Parameters
number—The maximum number of MLD groups that an interface can join.
action deny—When the maximum number of entries in the MLD snooping forwarding table is reached, drops the next MLD join report. This
is the default action.
action replace—When the maximum number of entries in the MLD snooping forwarding table is reached, replaces the existing group with the
new group for which the MLD report was received.
Command Mode
Interface Configuration mode
User Guidelines
You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces.
Follow these guidelines when configuring the MLD throttling action:
-
If you configure the throttling action as deny and set the maximum group limitation, the entries that were previously in the
forwarding table are not removed but are aged out. After these entries are aged out, when the maximum number of entries in
the forwarding table is reached, the switch drops the next MLD report received on the interface.
-
If you configure the throttling action as replace and set the maximum group limitation, the entries that were previously in
the forwarding table are removed. When the maximum number of entries in the forwarding table is reached, the switch replaces
a randomly selected multicast entry with the received MLD report.
Example
switchxxxxxx(config)# interface gi1
switchxxxxxx(config-if)# ipv6 mld max-groups 25
switchxxxxxx(config-if)# ipv6 mld max-groups action replace