System information

Web-Based Management
3-18
Spanning Tree Configuration
The following figures and tables describe Bridge STA configuration.
Switch
When the Switch Becomes Root
Parameter Default Description
Usage 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. (Remember that the lower the numeric value, the higher the
priority.) However, if all devices have the same priority, the device with the
lowest MAC address will then become the root device.
Range: 0 - 65535
Parameter Default Description
Hello Time 2 The 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.
Maximum value is 30.
Minimum value is the higher of 4 or [(Max. Message Age / 2) + 1].