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spanning-tree guard root
Use the spanning-tree guard root interface configuration command to enable root guard on all the
spanning tree instances on that interface. Root guard restricts the interface to be the root port for
the switch. Use the no form of this command to disable root guard on the interface.
Syntax
spanning-tree guard root
no spanning-tree guard root
Default Configuration
Root guard is disabled
Command Modes
Interface configuration (Ethernet, port-channel)
User Guidelines
•
Root guard can be enabled when the switch work in STP, RSTP and MSTP.
When root guard is enabled, if spanning-tree calculations cause a port to be selected as
the root port, the port transitions to the alternate state.
Example
The following example enables root guard on port g8.
Console(config)# interface ethernet g8
Console(config-if)# spanning-tree guard root
Spanning-Tree Commands
263
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