Maximum Age – The maximum time (in seconds) the switch can wait without receiving a configuration message before attempting to reconfigure. All switch ports (except for designated ports) receive configuration messages at regular intervals. Any port that ages out the STA information provided in the last configuration message it received becomes the designated port for the connected LAN. If it is a root port, a new root port is selected from among the switch ports connected to the network. (References to “ports” in this section mean “interfaces,” which include both ports and trunks.)

Specify a value from the higher of 6 or [2 x (Hello Time + 1)] to the lower of 40 or [2 x (Forward Delay - 1)]. The default is 20 seconds.

Forward Delay – The maximum time (in seconds) the switch waits before changing states (for example, from discarding 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 discarding state; otherwise, temporary data loops might result.

Specify a value from the higher of 4 or [(Max. Message Age / 2) + 1] to 30 seconds. The default is 15 seconds.

The following global parameters are statistical values and cannot be changed:

Number of Topology Changes – The number of times the spanning tree has been reconfigured.

Last Topology Change – The time since the spanning tree was last reconfigured.

Web Interface: Configuring Basic STA Settings

1.Open Switch Config Spanning Tree Basic Configuration.

2.Modify the required parameters.

3.Click Save.

3-72Sun Fire B1600 Blade System Chassis Switch Administration Guide • June 2003

Page 110
Image 110
Sunfire B1600 manual Web Interface Configuring Basic STA Settings