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228 CHAPTER 15: SPANNING-TREE COMMANDS
Command Mode
MST Configuration mode
User Guidelines
There are no user guidelines for this command.
Example
The following example exits the MST Configuration mode without saving
changes.
spanning-tree
guard root
The spanning-tree guard root Interface Configuration (Ethernet,
port-channel) mode command enables root guard on all spanning tree
instances on the interface. Root guard prevents the interface from
becoming the root port of the device. To disable root guard on the
interface, use the no form of this command.
Syntax
spanning-tree guard root
no spanning-tree guard root
Default Configuration
Root guard is disabled.
Command Mode
Interface Configuration (Ethernet, port-channel) mode
User Guidelines
Root guard can be enabled when the device operates in STP, RSTP and
MSTP.
When root guard is enabled, the port changes to the alternate state if
spanning-tree calculations selects the port as the root port.
Console(config) # spanning-tree mst configuration
Console(config-mst) # abort