The following MAC table management features are required for each instance of a SAP or spoke-SDP within a VPLS service instance:
MAC FIB size limits - Allows users to specify the maximum number of MAC FIB entries learned locally for a SAP or remotely for a spoke-SDP. If the configured limit is reached, then no new addresses will be learned from the SAP and spoke-SDP until at least one FIB entry is aged out or cleared:
When the limit is reached on a SAP and 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 FIB, and if the destination MAC address is unknown, it will be flooded. Alternatively, if discard unknown is enabled at the VPLS service level, unknown destination MAC addresses are discarded.
The log event SAP/SDP MAC limit reached is generated when the limit is reached. When the condition is cleared, the log event SAP/SDP MAC Limit Reached Condition Cleared is generated.
Disable learning at the VPLS service level allows users to disable the dynamic learning function on the service. Disable learning is not supported at the SAP level and spoke-SDP level.
Disable aging allows users to turn off aging for learned MAC addresses on a SAP and spoke-SDP of a VPLS service instance.