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Limiting the Number of MAC Addresses Learned from an Interface

You can configure a limit on the number of MAC addresses learned by a VPLS routing instance using the mac-table-size statement. If the MAC table limit is reached, new MAC addresses can no longer be added to the table. Eventually the oldest MAC addresses are removed from the MAC address table automatically. This frees space in the table, allowing new entries to be added. However, as long as the table is full, new MAC addresses are dropped.

Because this limit applies to each VPLS routing instance, the MAC addresses of a single interface can consume all the available space in the table, preventing the routing instance from acquiring addresses from other interfaces.

You can limit the number of MAC addresses learned from each interface configured for a VPLS routing instance. To do so, include the interface-mac-limit statement:




interface-mac-limit limit;

You can include this statement at the following hierarchy levels:

[edit routing-instances routing-instance-name protocols vpls]
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols vpls]

The interface-mac-limit statement affects the local interfaces only (the interfaces facing CE devices).

Configuring the interface-mac-limit statement at the [edit routing-instances routing-instance-name protocols vpls] hierarchy level causes the same limit to be applied to all of the interfaces configured for that specific routing instance.

You can also limit the number of MAC addresses learned by a specific interface configured for a VPLS routing instance. This gives you the ability to limit particular interfaces that you expect might generate a lot of MAC addresses.

To limit the number of MAC addresses learned by a specific interface, include the interface-mac-limit statement at the following hierarchy levels:

[edit routing-instances routing-instance-name protocols vpls site site-name interfaces interface-name]
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols vpls site site-name interfaces interface-name]

The MAC limit configured for an individual interface at this hierarchy level overrides any value configured at the [edit routing-instances routing-instance-name protocols vpls] hierarchy level. Also, the MAC limit configured using the mac-table-size statement can override the limit configured using the interface-mac-limit statement.

The MAC address limit applies to customer-facing interfaces only.

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