CLI Reference Guide-R07

Chapter 19 | Spanning Tree Commands
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could also be used to form a border around part of the network where the root
bridge is allowed.
◆ When spanning tree is initialized globally on the switch or on an interface, the
switch will wait for 20 seconds to ensure that the spanning tree has converged
before enabling Root Guard.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree root-guard
Console(config-if)#
spanning-tree
spanning-disabled
This command disables the spanning tree algorithm for the specified interface. Use
the no form to re-enable the spanning tree algorithm for the specified interface.
Syntax
[no] spanning-tree spanning-disabled
Default Setting
Enabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
When spanning tree is enabled globally (spanning-tree command) or enabled on
an interface by this command, loopback detection is disabled.
Example
This example disables the spanning tree algorithm for port 5.
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree spanning-disabled
Console(config-if)#
spanning-tree
tc-prop-stop
This command stops the propagation of topology change notifications (TCN). Use
the no form to allow propagation of TCN messages.
Syntax
[no] spanning-tree tc-prop-stop
Default Setting
Disabled