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Free Cisco CCNA Training: STP Interface States

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In this Cisco CCNA training video, I’ll go into more detail about the STP Interface States that were briefly explained in my last video on STP Timers. As we went over before, specifically in our video on Port Modes, ports don’t go directly from the blocking state to the forwarding state. If they did, loops could occur. The Spanning Tree Protocol (STP) has interfaces go through two intermediate states between blocking and forwarding – listening and learning.

I’ll go over each of the two intermediate states, show you how to check the STP timers for each state, and explain why each step is taken (and how they prevent switching loops.) Finally, I’ll review each of the timers and the order they are involved.

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