Alcatel-Lucent omnistack 6148 Manuale Utente

Using the System Configuration Program

2-28

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].