25.1.3 Aging learned MAC addressing

A learned entry is deleted when no frames are received from the source MAC address within the given aging time. This prevents entries from unnecessarily accumulating. When a frame is received within the aging time the aging timer is updated and the entry is kept. The range within which the aging time can be set is as follows:

• Aging time range: 0,10 to 1000000 (seconds)

  0 indicates eternity, with no aging performed.

• Default value: 300 (seconds)

At a maximum, twice the maximum aging time might be necessary for a learned entry to be deleted.

Note that if a port goes down, all entries learned for the port are deleted. Entries learned for channel groups are deleted when their channel group goes down.