Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS). It is defined as OSPF Version 2 in RFC 2328 (1998) for IPv4. The updates for IPv6 are specified as OSPF Version 3 in RFC 5340 (2008).
OSPF is perhaps the most widely used interior gateway protocol (IGP) in large enterprise networks. IS-IS, another link-state dynamic routing protocol, is more common in large service provider networks. The most widely used exterior gateway protocol is the Border Gateway Protocol (BGP), the principal routing protocol between autonomous systems on the Internet.
| Internet protocols |
|---|
| Application layer |
|
| Transport layer |
|
| Routing protocols * |
|
| Internet layer |
|
| Link layer |
|
| * Not a layer. A routing protocol belongs either to application or network layer. |
Read more about Open Shortest Path First: Overview, Neighbor Relationships, Area Types, Path Preference, OSPF Router Types, Designated Router, OSPF V3 Packet Formats, OSPF in Broadcast and Non-broadcast Networks, Implementations, Applications
Famous quotes containing the words open, shortest and/or path:
“Observe decorum, and it will open a path to morality.”
—Mason Cooley (b. 1927)
“The Gettysburg speech is at once the shortest and the most famous oration in American history. Put beside it, all the whoopings of the Websters, Sumners and Everetts seem gaudy and silly. It is eloquence brought to a pellucid and almost gem-like perfection—the highest emotion reduced to a few poetical phrases.”
—H.L. (Henry Lewis)
“The lesson which these observations convey is, be, and not seem. Let us acquiesce. Let us take our bloated nothingness out of the path of the divine circuits. Let us unlearn our wisdom of the world. Let us lie low in the lord’s power, and learn that truth alone makes rich and great.”
—Ralph Waldo Emerson (1803–1882)