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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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#### Spanning Tree Portfast Port Overview

All ports that are directly connected to end stations cannot create bridging loops and can rapidly transition to forwarding, skipping the learning and listening states.

You can configure a switch to automatically detect the presence of another switch connected to one of its port. If a switch receives configuration BPDUs from other switch, it can detect the presence of the other switch connected to one of its ports. On configuring a port with the `portfast` command, if the switch does not receive any BPDUs for a certain interval, spanning tree rapidly sets the port to forwarding state.

Valid interfaces include physical interfaces and port-channel logical interfaces (`port-channel` port-channel-number).

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