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OSPF Configuration
Open Shortest Path First (OSPF) is a link state interior gateway protocol developed by the OSPF
working group of the Internet Engineering Task Force (IETF). At present, OSPF version 2 (RFC2328) is
used.
When configuring OSPF, go to these sections for information you are interested in:
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Introduction to OSPF
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OSPF Configuration Task List
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Enabling OSPF
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Configuring OSPF Areas
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Configuring OSPF Network Types
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Configuring OSPF Route Control
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Configuring OSPF Network Optimization
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Configuring OSPF Sham Link
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Configuring OSPF Graceful Restart
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Displaying and Maintaining OSPF
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OSPF Configuration Examples
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Troubleshooting OSPF Configuration
The term “router” in this document refers to a router in a generic sense or an Ethernet switch running
routing protocols.
Introduction to OSPF
Unless otherwise noted, OSPF refers to OSPFv2 throughout this document.
OSPF has the following features:
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Wide scope: Supports networks of various sizes and up to several hundred routers in an OSPF
routing domain.
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Fast convergence: Transmits updates instantly after network topology changes for routing
information synchronization in the AS.
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Loop-free: Computes routes with the shortest path first (SPF) algorithm according to collected link
states, so no route loops are generated.
