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Purpose of This PowerPoint

This PowerPoint primarily consists of the TargetIndicators (TIs) of this module in CCNA version3.1.

It was created to give instructors a PowerPoint to

take and modify as their own. This PowerPoint is:

NOT a study guide for the module final assessment.

NOT a study guide for the CCNA certification exam.

Please report any mistakes you find in thisPowerPoint by using the Academy ConnectionHelp link.

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To Locate Instructional Resource Materialson Academy Connection:

Go to the Community FTP Center to locatematerials created by the instructor community

Go to the Tools section

Go to the Alpha Preview section

Go to the Community link under Resources

See the resources available on the Class homepage for classes you are offering

Search http://www.cisco.com

Contact your parent academy!

http://www.cisco.com/http://www.cisco.com/

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Objectives

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Redundancy

Redundant networking topologies are

designed to ensure that networks continue

to function in the presence of single points

of failure.

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Simple Redundant Switched Topology

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Multiple Frame Transmissions

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Media Access Control Database Instability

In a redundant switched network, it is

possible for switches to learn the wrong

information. A switch can learn that a MAC

address is on a port when it is not.

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Using Bridging Loops for Redundancy

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Spanning-Tree Protocol

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Spanning Tree Link Costs

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A Spanning Tree

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Spanning-Tree Operation

One root bridge pernetwork.

One root port pernonroot bridge.

One designatedport per segment.

Nondesignatedports are unused.

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Bridge Protocol Data Unit

Bridge protocol data unit

(BPDU)

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Bridge IDs

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Spanning-Tree Port States

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Spanning-Tree Recalculation

A switched internetwork has converged when

all the switch and bridge ports are in either the

forwarding or blocked state.

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Rapid Spanning-Tree Protocol

The standard and protocol introduce thefollowing:

Clarification of port states and roles

Definition of a set of link types that can goto forwarding state rapidly

Allowing switches, in a converged network,to generate their own BPDUs rather thanrelaying root bridge BPDUs

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Summary