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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Overview of OSPF

Overview of OSPF


The Open Shortest Path First (OSPF) protocol is a link-state Interior Gateway Protocol (IGP) developed by the Internet Engineering Task Force (IETF).

OSPF Version 2, as defined in RFC 2328, is designed for IPv4. OSPF Version 3, as defined in RFC 2740, is designed for IPv6. Unless otherwise stated, OSPF stated in this document refers to OSPF Version 2.


Before the introduction of OSPF, the Routing Information Protocol (RIP) was the most widely used IGP.

RIP is distance-vector routing protocol and has the problems of slow convergence, routing loops, and poor scalability. Therefore, OSPF now becomes the most widely accepted and used IGP.

OSPF is a link-state routing protocol resolving the problems faced by RIP and featuring:

  • Multicast packet transmission, reducing the load on the switches not running OSPF

  • Classless Interdomain Routing (CIDR)

  • Load balancing among equal-cost routes

  • Packet authentication

Updated: 2019-12-27

Document ID: EDOC1000174069

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