Chapter 5: Multiarea OSPF 

Media:

5.1.1 Issues with Maintaining a Large OSPF Network
The Solution: OSPF Hierarchical Routing
5.1.2 OSPF Multi-Area Components
5.1.3 Link-State Advertisements
OSPF LSA Types
Types of Areas
OSPF LSA
5.2.1 Forwarding Packet in a Multi-Area Network
5.2.2 Flooding LSUs to Multiple Areas
5.2.3 Path Calculation Order
5.3.1 Configuring OSPF ABRs
Configuring an ASBR
5.3.2 OSPF Route Summarization
5.4.1 Using Stub and Totally Stubby Areas
5.4.2 Stub and Totally Stubby Area Criteria
5.4.3 Define an Area as Stub/Totally Stubby
Define the Cost of the Default Route
5.4.4 OSPF Stub Area Configuration Example
5.4.5 OSPF Totally Stubby Configuration Example
5.5.1 Meeting the Backbone Area Requirements (1-2)
5.5.2 Configuring Virtual Links (1-2)
5.5.3 OSPF Virtual Link Configuration Example
5.6.1 Connecting OSPF to an External Autonomous System
Using an OSPF Standard Area to Connect to an External AS
Using an OSPF Stub Area to Connect to an External AS
Using an OSPF Not-So-Stubby Area to Connect to an External AS
5.6.2 How NSSA Operates
Configuring OSPF NSSA
5.6.3 Configuring OSPF NSSA (1-2)
5.7.1 Key Multiarea OSPF show Commands
5.8.1 Multiarea OSPF
5.8.2 Configuring a Stub Area and a Totally Stubby Area
5.8.3 Configuring an NSSA
5.8.4 Configuring Virtual Links
5.9.1 OSPF Challenge Lab