Spanning Tree Protocol Explained | Step by Step
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Spanning Tree Protocol / STP is a big topic on the CCNA exam. Many people struggle with STP so in this video, we try to break it down as much as possible. Spanning Tree follows a strict set of rules which when learnt, will allow you to answer any STP questions you get.
This video focus on the standard 802.1d (and PVST+) which is the original STP standard.
Election Process
1. Elect a Root Bridge
Switch with the lowest BID
2. Place all Root Bridge interfaces in to a Forwarding state
3. Each Non-Root switch elects a Root Port
Lowest cost
Lowest neighbour BID
Lowest neighbour port priority
Lowest neighbour port number
4. Elect a Designated Port
Lowest root cost
Lowest BID
Lowest neighbour port priority
Lowest neighbour port number
5. All other ports are placed in to a Blocking State
#ccna #cisco #networking
