Table of Contents
Interesting Things to do with OSPF
For Additional Information
The Past
The Near Term
The Standards Future
OSPF and Single Areas
An Area has...
Areas and Performance
Area Sizing Guidelines
When Might Single-Area OSPF make sense?
How Many Areas?
SIngle-Domain Inter-Area
Basic Inter-Area
The Right Reason to Break Hierarchy Traffic management, not “redundancy”
Summarization/Aggregation
Multiple ABR
Partitioned Nonzero Areas
External Information
Externals are a Good Thing
Multiple Homogeneous Domains
Multiple Heterogeneous Domains
Multiple Autonomous Systems
Externals and Aggregation 1
Externals & Aggregation 2
Type 1 and Type 2 externals
ASBR Placement
ASBR Default Information
OSPF and Default Routes
Redistribution
Redistribution = Acceptance
Hierarchical Redistribution
Basic Mutual Redistribution
Mutual Redistribution Multiple Redistribution Points
OSPF and Default Routes
Blackhole Routes
Complex and Useful Domain Relationships
A Trap to be Avoided: Overemphasizing Area 0
Access to Single ISP Closest-Exit Load Sharing, No BGP Needed
Single ISP Link-Level Load Balancing
Access to Primary & Backup ISP
Internet Access with Exception Case
RIP Migration
Stubbiness: A Means of Controlling Externals
Regular Area
The idea of stubbiness
Restrictions with Stub Areas
Stubby Area
Totally Stubby Area
Not So Stubby Area
Totally Stubby and also Not So Stubby
Backbones of Backbones
Default origination Domains have clean addressing; static routes between
eBGP linkage of enterprise routing domains
iBGP linkage of enterprise routing domains
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