Spanning-Tree Guard Root - D-Link DES-3010FA-TAA - Switch 10/100MBPS Mgmt Manual

D-Link DES-3010FA/GA CLI Reference Guide

spanning-tree guard root

The spanning-tree guard root interface configuration command enables root guard on all spanning tree
instances on that interface. Root guard restricts the interface to be the root port for the switch. 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 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 all spanning tree instances on port 5.
Console# configure
Console (config)# interface ethernet 5
Console (config-if)# spanning-tree guard root
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