Overview

Introduction

The Spanning tree module provides you with the instructions and Cisco hardware to develop your hands on skills in various spanning tree configurations on Cisco switches. This module includes the following exercises:

  1. Spanning-tree (STP)
  2. Tuning STP timers

Exercise 1 – Spanning-tree (STP)

In this exercise you will learn how to determine the outcome of the default spanning-tree topology between the 3 switches in the lab, how to manipulate this configuration and how to verify that your manipulations have worked.

Exercise 2 – Tuning STP timers

In this exercise we are going to tune the spanning-tree timers to make the network converge a little quicker.

A word of caution

In almost every circumstance I would leave the default spanning-tree timers set to defaults. These timers are set to specific default values for a reason and in most instances they work exactly as required. However, if you find yourself in a situation where you need to modify these, you can learn how to change these in this exercise.

Changing the timers

The 3 timers at your disposal are as follows (these are nicely calculated on the Cisco link provided at the beginning of this exercise above):

  • Hello timer (default 2 seconds)
  • Forward timer (default 15 seconds)
  • Max-Age timer (default 20 seconds)

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