Open Shortest Path First is an open-standard Link State routing protocol. Link State routing protocols advertise the state of their links. When a Link State router begins operating on a network link, information associated with that logical network is added to its local Link State Database (LSDB). The local router then sends Hello messages on its operational links to determine whether other Link State routers are operating on the interfaces as well. OSPF runs directly over Internet Protocol using IP protocol number 89. The ROUTE exam objective covered in this chapter is:
- Implement a multi-area OSPF Network, given a network design and a set of requirements
This chapter contains the following sections:
- OSPF Overview and Fundamentals
- OSPF Configuration Fundamentals
- OSPF Packet Types
- Establishing Adjacencies
- OSPF LSAs and the Link State Database (LSDB) Part I
- OSPF LSAs and the Link State Database (LSDB) Part II
- OSPF Areas Part I
- OSPF Areas Part II
- Route Metrics and Best Route Selection
- OSPF Default Routing
- OSPF Virtual Links
- OSPF Route Summarization
- OSPF Passive Interfaces
- Securing OSPF Messages
- Configuring OSPF over Non-Broadcast Networks