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Chapter 6. Routing > Open Shortest Path First (OSPF)

6.3. Open Shortest Path First (OSPF)

OSPF is a link state protocol and is considered one of the best protocols to run for your internal network. The open in OSPF represents that it is an open standard protocol. OSPF will only send out periodic updates and is not considered to be a chatty protocol. It is extremely efficient and is supported by most modern routing equipment.

6.3.1. Networking with OSPF

In addition to being a dynamic routing protocol, OSPF is the first link-state protocol we will look at. The Open in OSPF represents the fact that the protocol is an open standard developed by the Internet Engineering Task Force (IETF) and described in RFC 2328. It was designed as an IGP to route within a single autonomous system (AS), but with the Internet environment in mind. OSPF can tag routes that come into the AS from outside the network. The Shortest Path First in the name refers to the algorithm the protocol uses to compute the shortest path to every destination in the route table. OSPF can be an extremely complex protocol in very large networks, so in this section we will only examine the basics of the protocol functionality. Some basic details to remember about OSPF include:


  

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