Alcatel OmniStack 6124, User Manual

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Using the System Configuration Program
2-28
Parameter Default Description
Spanning Tree
Protocol
Enabled Enable this parameter to participate in a 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.
The minimum value is 1.
The maximum value is the 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].