Chapter 17
| Spanning Tree Commands
– 444 –
spanning-tree This command enables the Spanning Tree Algorithm globally for the switch. Use
the no form to disable it.
Syntax
[no] spanning-tree
Default Setting
Spanning tree is enabled.
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:
Console(config)#spanning-tree
Console(config)#
spanning-tree port-priority Configures the spanning tree priority of an interface IC
spanning-tree root-guard Prevents a designated port from passing superior BPDUs IC
spanning-tree spanning-
disabled
Disables spanning tree for an interface IC
spanning-tree tc-prop-stop Stops propagation of topology change information IC
spanning-tree protocol-
migration
Re-checks the appropriate BPDU format PE
show spanning-tree Shows spanning tree configuration for the common
spanning tree (i.e., overall bridge), a selected interface, or
an instance within the multiple spanning tree
PE
show spanning-tree mst
configuration
Shows the multiple spanning tree configuration PE
Table 87: Spanning Tree Commands (Continued)
Command Function Mode
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