Open Shortest Path First
Routing protocol for IP networks / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Open Shortest Path First?
Summarize this article for a 10 years old
Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single autonomous system (AS).
| Communication protocol | |
| Purpose | Routing protocol |
|---|---|
| Introduction | 1989 |
| RFC(s) | 1131, 1247, 1583, 2178, 2328, 3101, 5709, 6549, 6845... |
| Communication protocol | |
| Introduction | 1999 |
|---|---|
| RFC(s) | 2740, 5340, 6845, 6860, 7503, 8362... |
OSPF gathers link state information from available routers and constructs a topology map of the network. The topology is presented as a routing table to the Internet Layer for routing packets by their destination IP address. OSPF supports Internet Protocol Version 4 (IPv4) and Internet Protocol Version 6 (IPv6) networks and supports the Classless Inter-Domain Routing (CIDR) addressing model.
OSPF is widely used in large enterprise networks. IS-IS, another LSR-based protocol, is more common in large service provider networks.
Originally designed in the 1980s, OSPF is defined for IPv4 in protocol version 2 by RFC 2328 (1998).[1] The updates for IPv6 are specified as OSPF Version 3 in RFC 5340 (2008).[2] OSPF supports the Classless Inter-Domain Routing (CIDR) addressing model.
| Internet protocol suite |
|---|
| Application layer |
| Transport layer |
| Internet layer |
| Link layer |