Chapter 5: OSPF with Multiple Areas

Outline:

Chapter Review
Chapter Overview 
5.1 Creating Multiple OSPF Areas
5.1.1 Issues with Large One-Area OSPF Networks
5.1.2 OSPF Hierarchical Routing
5.1.3 OSPF Multi-Area Components
5.1.4 Types of OSPF routers
5.1.5 Types of LInk-States Advertisements (LSAs)
5.1.6 Types of Area
5.1.7 Calculating Costs for External Routes
5.2 Configuring OSPF Operation Across Multiple Areas
5.2.1 Forwarding Packets in a Multi-Area Network
5.2.2 Flooding LSUs to Multiple Areas
5.2.3 Updating the Routing Table
5.3 Using and Configuring OSPF Multi-Area Component
5.3.1 Configuring OSPF ABRs
5.3.2 Using Route Summarization
5.3.3 Configuring Route Summarization
5.4 Using Stub and Totally Stubby Areas
5.4.1 What Are Stub and Totally Stubby Areas
5.4.2 Stub and Totally Stub Area Restrictions
5.4.3 Configuring Stub and Totally Stubby Areas
5.4.4 OSPF Stub Area Configuration Example
5.4.5 OSPF Totally Stubby Configuration Example
5.5 Meeting the Backbone Area Requirements
5.5.1 Creating a Virtual Link
5.5.2 Configuring Virtual Links
5.5.3 OSPF Virtual Link Configuration Example
5.6 Using and Configuring NSSA
5.6.1 When to Use NSSA
5.6.2 How NSSA Operates
5.6.3 Configuring NSSA
5.7 Verifying OSPF Operation
5.7.1 Show Command
Chapter Summary
Chapter Quiz