Per-VPLS Service FDB Size

The following MAC table management features are available for each instance of a SAP or spoke-SDP within a particular VPLS service instance.

MAC FDB size limits — Allows users to specify the maximum number of MAC FDB entries that are learned locally for a SAP or remotely for a spoke-SDP. If the configured limit is reached, no new addresses is learned from the SAP or spoke-SDP until at least one FDB entry is aged out or cleared.

When the limit is reached on a SAP or spoke-SDP, packets with unknown source MAC addresses are still forwarded (this default behavior can be changed by configuration). By default, if the destination MAC address is known, it is forwarded based on the FDB, and if the destination MAC address is unknown, it is flooded. Alternatively, if discard unknown is enabled at the VPLS service level, any packets from unknown source MAC addresses are discarded at the SAP.
The log event SAP MAC Limit Reached is generated when the limit is reached. When the condition is cleared, the log event SAP MAC Limit Reached Condition Cleared is generated.
Disable learning allows users to disable the dynamic learning function on a SAP or a spoke-SDP of a VPLS service instance.
Disable aging allows users to turn off aging for learned MAC addresses on a SAP or a spoke-SDP of a VPLS service instance.