CHAPTER
1-1
Cisco ASA Series CLI Configuration Guide
1
Configuring OSPF
This chapter describes how to configure the ASA to route data, perform authentication, and redistribute
routing information using the Open Shortest Path First (OSPF) routing protocol.
The chapter includes the following sections:
• Information About OSPF, page 1-1
• Licensing Requirements for OSPF, page 1-3
• Guidelines and Limitations, page 1-3
• Configuring OSPFv2, page 1-5
• Customizing OSPFv2, page 1-6
• Configuring OSPFv3, page 1-18
• Removing the OSPF Configuration, page 1-42
• Configuration Example for OSPFv2, page 1-42
• Configuration Examples for OSPFv3, page 1-43
• Monitoring OSPF, page 1-45
• Additional References, page 1-47
• Feature History for OSPF, page 1-48
Information About OSPF
OSPF is an interior gateway routing protocol that uses link states rather than distance vectors for path
selection. OSPF propagates link-state advertisements rather than routing table updates. Because only
LSAs are exchanged instead of the entire routing tables, OSPF networks converge more quickly than RIP
networks.
OSPF uses a link-state algorithm to build and calculate the shortest path to all known destinations. Each
router in an OSPF area contains an identical link-state database, which is a list of each of the router
usable interfaces and reachable neighbors.
The advantages of OSPF over RIP include the following:
• OSPF link-state database updates are sent less frequently than RIP updates, and the link-state
database is updated instantly, rather than gradually, as stale information is timed out.
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