Allied Telesis AT-S63 - Manual (Page 237)

AT-S63 Stack Command Line Interface User’s Guide
Section III: Spanning Tree Protocols 237
hellotime Specifies 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.
forwarddelay Specifies 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, all links may not have had time to adapt to the
change, resulting in network loops. The range is 4 to 30
seconds. The default is 15 seconds.
maxage Specifies 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. The range is 6 to 40
seconds. The default is 20 seconds.
Note
The value for the maxage parameter must be greater than
(2 x (hellotime +1)) and less than (2 x (forwarddelay -1)).
Description
This command sets the following STP parameters:
ˆ Bridge priority
ˆ Hello time
ˆ Forwarding delay
ˆ Maximum age time
This command can also disable STP and return the STP parameters to
their default settings.
Note
You can use this command only if STP is designated as the active
spanning tree protocol on the stack. See “ACTIVATE STP” on
page 232.