Open Shortest Path First

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Open Shortest Path First (usually known as OSPF) is a routing protocol for the TCP/IP protocol suite. It is an IGP, and can be used either on pieces of the Internet, or on disconnected internets.

It is a link state routing protocol; it was mostly inspired by the first LS routing protocol, that used on the ARPANET, but it also 'borrowed' a few ideas from IS-IS.