Cisco Catalyst 250 Series Command Reference

Do not enable root guard on interfaces that will be used by the UplinkFast feature. With UplinkFast, the
backup interfaces (in the blocked state) replace the root port in the case of a failure. However, if root guard
is also enabled, all the backup interfaces used by the UplinkFast feature are placed in the root-inconsistent
state (blocked) and are prevented from reaching the forwarding state. The UplinkFast feature is not available
when the switch is operating in the rapid-PVST+ or MST mode.
Examples
This example shows how to enable root guard on all the VLANs associated with the specified interface:
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# spanning-tree guard root
Related Commands
DescriptionCommand
Enables loop guard on all ports.
spanning-tree loopguard default
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
OL-29043 -01 87
Layer 2 Commands
spanning-tree guard

Cisco Catalyst 250 Series Specifications

General

Brand	Cisco
Model	Catalyst 250 Series
Category	Switch
Language	English