Chapter 17
| Spanning Tree Commands
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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.
◆
When spanning tree is enabled globally by this command or enabled on an
interface (
spanning-tree spanning-disabled
command), loopback detection
is disabled.
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)#
