Cisco Catalyst 250 Series Command Reference

Do not enable the 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 prevented from reaching the forwarding state.
If you set the max-update-rate to 0, station-learning frames are not generated, so the spanning-tree topology
converges more slowly after a loss of connectivity.
Examples
This example shows how to enable UplinkFast and set the maximum rate to 200 packets per second:
Switch(config)# spanning-tree uplinkfast max-update-rate 200
Related Commands
DescriptionCommand
Displays spanning-tree information.
show spanning-tree
Configures STP on a per-VLAN basis.
spanning-tree vlan
Catalyst 2960-X Switch Layer 2 Command Reference, Cisco IOS Release 15.0(2)EX
112 OL-29043 -01
Layer 2 Commands
spanning-tree uplinkfast

Cisco Catalyst 250 Series Specifications

General

Brand	Cisco
Model	Catalyst 250 Series
Category	Switch
Language	English