Allied-telesis AT-S63 User Manual Page 304

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Chapter 19: Spanning Tree and Rapid Spanning Tree Protocols
304 Section IV: Spanning Tree Protocols
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.
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.
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 greater than (2 x (HelloTime + 1)).
MaxAge must be less than (2 x (ForwardingDelay - 1))
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.
Root Bridge
The MAC address of the root bridge of the spanning tree domain. This
value cannot be changed and is only displayed when RSTP is
activated on the switch.
Root Priority
The priority value on the root bridge of the spanning tree domain. This
parameter is only displayed when RSTP is enabled on the switch. To
change the priority value on the root bridge, you must start a
management session on the switch functioning as the root bridge and
change its bridge priority value.
6. After you have made your changes, click Apply.
7. To permanently save your changes, select the Save Config option in
the Configuration menu.
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