Cabletron Systems STS16-20R manual Current Spanning Tree Information Screen, Path Cost, STP Mode

Models: STS16-20R STS16-20D

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Note: For SmartStack STS16-20D n/a will be displayed for ports 1 to 16 as they do not support spanning tree protocol.

Path Cost

Cost associated with the port. The spanning tree protocol uses port path costs to determine which port to select as a forwarding port. Therefore, lower numbers should be assigned to ports attached to faster media (such as FDX or CrossLink), and higher numbers should be assigned to ports attached to slower media. The

possible range is 1 to 65,535. The default is 62. The recommended path cost is 1000 / LAN speed in Mbps.

Note: For SmartStack STS16-20D, the text n/a will be displayed for ports 1 to 16 as they do not support spanning tree protocol.

STP Mode

The port’s spanning tree mode. Possible values are forwarding, blocked, and auto.

When auto is selected, the spanning tree protocol will be used to determine the forwarding/blocking state.

When set to blocked, the port will not forward any frames. When set to forwarding, the port will always forward frames.

On SmartStack STS16-20D ports 1 to 16 will always be in forwarding state.

If the port is used to connect to a single station, forwarding might be the preferred mode since it might take 30 seconds or more before a port is opened until it starts forwarding frames. If connected to a shared media or a bridge, be careful not to create loops.

More

To view more ports in the table.

Change

To change or add values to specific ports.

Current Spanning Tree Information Screen

A summary of STP information for each port is available from the “Current Spanning Tree Information” screen. See Chapter 7, “Monitoring the Network from the Console Statistics Menu” on page 185 for more information.

Switch Configuration

SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide

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Cabletron Systems STS16-20R Current Spanning Tree Information Screen, Path Cost, STP Mode, To view more ports in the table