Allied Telesis AT-S25 - Manual (Page 46)

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7. Change the priority and port cost parameters for the ports, as desired.
The parameters are defined below:
Priority
This parameter is used as a tie breaker when two or more ports are
determined to have equal costs to the root bridge. The default
value for priority is 128. The range is 0-255.
Cost
The spanning tree algorithm uses the cost parameter to decide
which port provides the lowest cost path to the root bridge for
that LAN. The default values for this parameter are 100 for a 10
Mbps port, 10 for a 100 Mbps port, and 1 for a 1 Gbps port. The
range is 1 to 65535.
8. Return to the Main Menu.
Configuring STP
Parameters
This section explains how to set the following STP parameters:
❑ Bridge priority
❑ Maximum age time
❑ Hello time
❑ Forwarding delay
To configure these STP parameters for a stack, perform the following
procedure:
1. From the Main Menu, select any switch in the stack.
Note
You do not need to select the master switch to set the STP
parameters. Once set, the values will apply to all switches in the
stack.
2. From the Main Menu, select Bridging.
The Bridging menu in Figure 9 on page 44 is displayed.
3. Select Spanning tree parameters.