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S
PANNING
T
REE
C
OMMANDS
4-223
Command Mode
Global Configuration
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:
spanning-tree mode
This command selects the spanning tree mode for this switch. Use the no
form to restore the default.
Syntax
spanning-tree mode {stp | rstp
| mstp}
no spanning-tree mode
• stp - Spanning Tree Protocol (IEEE 802.1D)
• rstp - Rapid Spanning Tree Protocol (IEEE 802.1w)
• mstp - Multiple Spanning Tree (IEEE 802.1s)
Default Setting
rstp
Command Mode
Global Configuration
Console(config)#spanning-tree
Console(config)#