Virtual Private LAN Services
7750 SR OS Services Guide Page 331
Table management
The following sections describe VPLS features related to management of the Forwarding
Information Base (FIB).
FIB Size
The following MAC table management features are required for each instance of a SAP or spoke
SDP within a particular VPLS service instance:
• MAC FIB size limits — Allows users to specify the maximum number of MAC FIB
entries that are learned locally for a SAP or a spoke SDP. If the configured limit is
reached, then no new addresses will be learned from the SAP until at least one FIB entry
is aged out or cleared.
→ When the limit is reached on a SAP, packets with unknown source MAC addresses are
still forwarded (this default behavior can be changed via 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, 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.
FIB Size Alarms
The size of the VPLS FIB can be configured with a low watermark and a high watermark,
expressed as a percentage of the total FIB size limit. If the actual FIB size grows above the
configured high watermark percentage, an alarm is generated. If the FIB size falls below the
configured low watermark percentage, the alarm is cleared by the system.
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