Spanning Tree Protocol Explained | Step by Step

Published: 29 August 2017
on channel: CertBros

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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

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