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:
“When strawberries go begging, and the sleek
Blue plums lie open to the blackbirds beak,
We shall live wellwe shall live very well.”
—Elinor Wylie (18851928)
“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 perfectionthe highest emotion reduced to a few poetical phrases.”
—H.L. (Henry Lewis)
“A few hours mountain climbing turns a rogue and a saint into two roughly equal creatures. Weariness is the shortest path to equality and fraternityand liberty is finally added by sleep.”
—Friedrich Nietzsche (18441900)