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PortFast Definition: PortFast is a feature in Cisco switches that allows a port to bypass the spanning tree protocol and immediately transition to the forwarding state to reduce convergence time for end devices.
PortFast is a feature in network switches that allows designated switch ports to bypass the Spanning Tree Protocol (STP) listening and learning states and immediately transition to the forwarding state. This helps connected devices, such as computers or IP phones, achieve fast connectivity without experiencing delays caused by STP convergence.