Allied Telesis AT-S60 - Manual (Page 207)

Chapter 12: STP, RSTP, and MSTP
Section II: Local and Telnet Management 206
3 - Bridge Hello Time
The time interval between generating and sending configuration
messages by the bridge. This parameter can be from 1 to 10
seconds. The default is 2 seconds.
4 - Bridge Forwarding
The waiting period before a bridge changes to a new state, for
example, becomes the new root bridge after the topology
changes. If the bridge transitions too soon, not all links may have
yet adapted to the change, possibly resulting in a network loop.
The range is 4 to 30 seconds. The default is 15 seconds. This
setting applies only to ports running in the STP-compatible mode.
5 - Bridge Max Age
The length of time after which stored bridge protocol data units
(BPDUs) are deleted by the bridge. All bridges in a bridged LAN
use this aging time to test the age of stored configuration
messages called bridge protocol data units (BPDUs). For example,
if you use the default 20, all bridges delete current configuration
messages after 20 seconds. This parameter can be from 6 to 40
seconds. The default is 20 seconds.
In selecting a value for maximum age, the following must be
observed:
MaxAge must be less then (2 x (HelloTime + 1)).
MaxAge must be less then (2 x (ForwardingDelay - 1))
6 - Bridge Identifier
The MAC address of the bridge. The bridge identifier is used as a
tie breaker in the selection of the root bridge when two or more
bridges have the same bridge priority value. This value cannot be
changed.
4. After making changes, type R until you return to the Main Menu. Then
type S to select Save Configuration Changes.