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This lesson explains how Spanning Tree Protocol prevents Layer 2 loops by electing a root bridge and selecting root and designated ports. It covers the decision rules used in those selections.
Syllabus
Introduction
Things we'll cover
The need for STP
What does STP do?
The STP Algorithm
Root Bridge election
Root Port selection
Root Port selection: root cost
Root Port selection: lowest neighbor BID
Root Port selection: lowest neighbor port ID
Root Port selection: lowest local port ID
Designated Port selection
Designated Port selection: lowest root cost
Designated Port selection: lowest BID
Things we covered
Quiz
Thank you to supporters
Taught by
Jeremy's IT Lab