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Open Shortest Path First (OSPF) Routing Protocol LiveLessons

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Open Shortest Path First (OSPF) Routing Protocol LiveLessons

By Sean Wilkins
Published Nov 30, 2018 by Cisco Press. Part of the LiveLessons series.

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Description

Sample Content

Updates

Copyright 2019
Edition: 1st

Online Video
ISBN-10: 0-13-468655-1
ISBN-13: 978-0-13-468655-4

5+ Hours of Video Instruction

Modern networks are connected using the Internet Protocol (IP) and the control of how this traffic is handled is managed by a few routing protocols; of these OSPF (Open Path Shortest First) is one of the most widely used protocols inside organizational networks. This LiveLesson focuses on OSPF, specifically version 2, and what makes it one of the most preferred options.

The objective of this LiveLesson is to start from a basic knowledge of IP routing protocols, and then quickly accelerates into a thorough conversation of OSPF theory, operation, and configuration. These concepts are then solidified with several lab demonstrations, showing you how to display, understand, and configure various OSPF features.

Skill Level

Beginner to intermediate

Learn How To

Establish relationships between OSPF devices
Build the OSPF link-state database
Configure OSPF on Cisco devices
Create hierarchical routing domain designs with OSPF areas
Communicate information between the different types of OSPF areas with LSAs
Configure OSPF with multiple areas
Secure OSPF implementations from attack
Enable Secure OSPF Communication and Interaction
Increase OSPF performance and optimization including Graceful restart, LSA/SPF scheduling & Throttling, Incremental SPF, and Prefix suppression

Who Should Take This Course

As OSPF is a widely-deployed routing protocol, this course will appeal to almost any networking engineer. Cisco certification candidates at the CCNA and CCNP level will also find this course useful in preparing for their certification exams.

Course Requirements

None

Lesson descriptions

Lesson 1: OSPF in Context
Routing Protocol Types
This includes the review of the different types of routing protocol (DV (PV), LS) and a review of the common protocols that are within each of these groups.
The Distance Vector Approach
This is a quick walk-through of how a distance vector protocol (RIP) determines the best path through the network.
The Link State Approach
This is an in-depth review of how link state protocols differ from Distance Vector options, specifically reviewing what each of the different devices know when making decisions.
Link State Adjacencies and the Collection of Link State Data
This is a high-level review of how link state devices connect together and how the information that is exchanged by OSPF is collected and used to determine the best paths.
Dijkstra's SPF—An Introduction
This is an in depth review of how Dijkstra's SPF determines the best path, specifically reviewing how networks need to be viewed as a graph of different vertices’ and how each of these use the information that is given to them to find the shortest paths.
Dijkstra's SPF—Some Complexities
This includes a review of some of the more complex cases that come up when calculating the shortest path tree—including equal cost multipath, pseudonodes, and how they are combined.

Lesson 2: OSPF Concepts
The Communication Blocks of OSPF (Packet Types)
This will be a review of the different OSPF packet types and the basics of how they are used.
Establishing Relationships between OSPF Devices
A discussion of OSPF neighborships including the different network link types, designated routers (pseudonodes), timers, required parameters, as well as a review of the different neighborship states.
Introducing the Different Types of Link State Information Blocks (LSDB/LSAs)
A detailed discussion of the different LSAs that are used to exchange information in a single area OSPF network.
Starting to Build the OSPF Link State Database
A discussion that takes the information that was covered in the previous lesson and details how this information is used to populate the link state database.
Lesson Lab
This will include the configuration of an OSPF on Cisco equipment and example of how the LSDBs are built.

Lesson 3: OSPF Function and Hierarchy
Introduction to OSPF Areas
This includes a review of what an OSPF area is and how it can be used to create a hierarchical routing domain design.
OSPF Route Types and the Initial Building of the Routing Table
This includes a review of the different types of OSPF routes and how they are used by the OSPF process.
Multi-area Link State Information Blocks
This extends on a previous lesson and reviews the different LSAs that are used when implementing a multi-area OSPF network design.
Discussing the Different Types of OSPF Area
This includes a review of the different types of the OSPF area, how they differ from each other, and how they affect the types of LSAs that are allowed to be exchanged.
Moving OSPF Concepts to Reality
This takes the information collected from the previous lessons and shows how it applies in a few different examples.
Lesson Lab
This will include the configuration of OSPF using multiple areas using a common topology and building onto it and showing how it affects the LSDB.

Lesson 4: OSPF Security Considerations
Discussing the Different Security Threat Vectors and Motivations
This includes a discussion of the different ways that an OSPF implementation can be attacked and the recommended features or configurations that can be used to secure against them.
Reviewing the Methods that Enable Secure OSPF Communication and Interaction
This includes a discussion of the different methods of authenticating and encrypting OSPF traffic. as well as preventing unneeded traffic (passive).
Lesson Lab
This will include the configuration of one or more of the authentication/encryption methods discussed previously.

Lesson 5: Optimizing OSPF Operations
Accelerating OSPF Convergence
This includes a discussion about two features that can be implemented to accelerate the convergence time of OSPF, including fast hellos and Bi-directional forwarding detection (BFD).
Controlling OSPF LSA Generation and Propagation
This includes a discussion of four different technologies that can be implemented to control OSPF LSA generation and propagation, including the LSA throttling, flood pacing, group pacing, and retransmission pacing features.
Altering Shortest Path First Behavior
This includes a discussion very similar to the last but instead of controlling LSAs, this section focuses on how to alter the behavior of the shortest path algorithm.
Reducing the Size of the LSDB
This includes a review of a number of features that can be used to reduce the overall size of the link state database and how this optimizes the OSPF process overall.
Reducing the Effects of Restarts on OSPF
This includes a review of the graceful restart feature as used by OSPF and how it reduces the overall downtime of the OSPF process when a restart is required.

Lesson Lab
This includes the configuration of the features that where covered in the preceding lessons.

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Lesson 1: OSPF in Context
1.0 Learning objectives
1.1 Routing Protocol Types
1.2 The Distance Vector Approach
1.3 The Link State Approach
1.4 Link State Adjacencies and the Collection of Link State Data
1.5 Dijkstra's SPF - An Introduction
1.6 Dijkstra's SPF - Some Complexities

Lesson 2: OSPF Concepts
2.0 Learning objectives
2.1 The Communication Blocks of OSPF
2.2 Establishing Relationships between OSPF Devices
2.3 Introducing the Different Types of Link State Information Blocks
2.4 Starting to Build the OSPF Link State Database
2.5 Lesson 2 Lab

Lesson 3: OSPF Hierarchy (How Areas Function)
3.0 Learning objectives
3.1 Introduction to OSPF Areas
3.2 OSPF Route Types and the Initial Building of the Routing Table
3.3 Multi-area Link State Information Blocks
3.4 Discussing the Different Types of OSPF Area
3.5 Moving OSPF Concepts to Reality
3.6 Lesson 3 Lab

Lesson 4: OSPF Security Considerations
4.0 Learning objectives
4.1 Discussing the Different Security Threat Vectors and Motivations
4.2 Reviewing the Methods that Enable Secure OSPF Communication and Interaction
4.3 Lesson 4 Lab

Lesson 5: Optimizing OSPF Operations
5.0 Learning objectives
5.1 Accelerating OSPF Convergence
5.2 Controlling OSPF LSA Generation and Propagation
5.3 Altering Shortest Path First Behavior
5.4 Reducing the Size of the LSDB
5.5 Reducing the Effects of Restarts on OSPF
5.6 Lesson 5 Lab

Summary
2.0

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