Allied Telesis AT-S79 - Manual (Page 308)

Chapter 32: Rapid Spanning Tree Protocol (RSTP)
308 Section II: Web Browser Interface
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 Priority
The priority number for the bridge, in hexadecimal format. This number
is used to determine the root bridge for RSTP. The bridge with the
lowest priority number is selected as the root bridge. If two or more
bridges have the same priority value, that is, the lowest value of all the
other bridges, then the bridge with the numerically lowest MAC
address becomes the root bridge. When a root bridge goes offline, the
bridge with the lowest priority number automatically takes over as the
root bridge. This parameter can be from 0X0000 to 0XF000, with
0XF000 being the highest priority.
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.