Allied Telesis AT 8000/8POE - Manual (Page 302)

Chapter 28: RSTP
302 Section II: Web Browser Interface
Forward Delay
The time interval between generating and sending configuration
messages by the root bridge.
The lower section provides information about the bridge and the
following parameters refer to the switch.
Bridge ID
The MAC address of the bridge. The bridge identifier is use as a tie
breaker in the selection of the root bridge when two or more bridges
have the same bridge priority. You cannot change this setting.
Bridge Hello Time
This is the time interval between generating and sending configuration
messages by the bridge. This parameter is active only when the switch
is the root bridge.
Bridge Maximum Age
The length of time after which stored bridge protocol data units
(BPDUs) are deleted by the bridge.
Bridge Forward Delay
This is the time interval between generating and sending configuration
messages by the bridge.