What Is Cisco Portfast?
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Cisco Portfast is a feature designed to reduce the time it takes for spanning tree Protocol (STP) to go from listening or learning, to forwarding. It helps to prevent layer 2 loops by quickly transitioning ports connected to end–user devices from the blocking mode to the forwarding mode, bypassing the listening and learning states. When enabled on a switch port, it skips the normal STP convergence process and immediately transitions to the forwarding state. This can help prevent spanning tree loops and improve network performance.