Allied Telesis AT-S29 - Manual (Page 44)

Using the System Configuration Program
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Parameter Default Description
Spanning Tree
Protocol Enabled Enable this parameter to participate in an STA compliant network.
Priority 32,768 Device priority is used in selecting the root device, root port, and
designated port. The device with the highest priority becomes the
STA root device. However, if all devices have the same priority, the
device with the lowest MAC address will then become the root
device.
Enter a value from 0 - 65535.
Remember that the lower the numeric value, the higher the
priority.
Hello Time 2 Time interval (in seconds) at which the root device transmits a
configuration message.
Minimum value: 1
Maximum value: lower of 10 or [(Max. Message Age / 2) -1]
Max (Message)
Age 20 The maximum time (in seconds) a device can wait without
receiving a configuration message before attempting to
reconfigure. All device ports (except for designated ports) should
receive configuration messages at regular intervals. Any port that
ages out STA information (provided in the last configuration
message) becomes the designated port for the attached LAN. If it
is a root port, a new root port is selected from among the device
ports attached to the network.
The minimum value is the higher of 6 or [2 x (Hello Time + 1)].
The maximum value is the lower of 40 or [2 x (Forward Delay - 1)].
Forward Delay 15 The maximum time (in seconds) the root device will wait before
changing states (i.e., listening to learning to forwarding). This
delay is required because every device must receive information
about topology changes before it starts to forward frames. In
addition, each port needs time to listen for conflicting information
that would make it return to a blocking state; otherwise,
temporary data loops might result.
The maximum value is 30.
The minimum value is the higher of 4 or [(Max. Message Age / 2) +
1].