Chapter 19
| Spanning Tree Commands
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Command Usage
The Spanning Tree Algorithm (STA) can be used to detect and disable network
loops, and to provide backup links between switches, bridges or routers. This
allows the switch to interact with other bridging devices (that is, an STA-compliant
switch, bridge or router) in your network to ensure that only one route exists
between any two stations on the network, and provide backup links which
automatically take over when a primary link goes down.
Example
This example shows how to enable the Spanning Tree Algorithm for the switch:
Console(config)#spanning-tree
Console(config)#
spanning-tree
cisco-prestandard
This command configures spanning tree operation to be compatible with Cisco
prestandard versions. Use the no form to restore the default setting.
[no] spanning-tree cisco-prestandard
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
Cisco prestandard versions prior to Cisco IOS Release 12.2(25)SEC do not fully
follow the IEEE standard, causing some state machine procedures to function
incorrectly. The command forces the spanning tree protocol to function in a
manner compatible with Cisco prestandard versions.
Example
Console(config)#spanning-tree cisco-prestandard
Console(config)#
spanning-tree
forward-time
This command configures the spanning tree bridge forward time globally for this
switch. Use the no form to restore the default.
Syntax
spanning-tree forward-time seconds
no spanning-tree forward-time
seconds - Time in seconds. (Range: 4 - 30 seconds)
The minimum value is the higher of 4 or [(max-age / 2) + 1].
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