Conclusion
The UplinkFast feature dramatically decreases the convergence time of the STP in the event of the failure of an uplink on an access switch. UplinkFast interacts with other switches that have a strict standard STP. UplinkFast is only effective when the configured switch has some non-self-looped blocked ports. In order to increase the chances to have blocked ports, the port cost and bridge priority of the switch are modified. This tuning is consistent for an access switch, but is not useful on a core switch.
UplinkFast only reacts to direct link failure. A port on the access switch must physically go down in order to trigger the feature. Another Cisco proprietary feature, Backbone Fast, can help to improve convergence time of a bridged network in case of indirect link failure.
Command Reference
- clear spantree uplinkfast (CatOS)
- set spantree uplinkfast (CatOS)
- show spantree (CatOS)
- set logging level (CatOS)
- logging console debugging
- spanning-tree uplinkfast (Cisco IOS)
- show spanning-tree (Cisco IOS)
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