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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, developed by the Internet Engineering Task Force (IETF), is a link-state Interior Gateway Protocol (IGP).

At present, OSPF Version 2, defined in RFC 2328, is intended for IPv4, and OSPF Version 3, defined in RFC 2740, is intended for IPv6. Unless otherwise stated, OSPF stated in this document refers to OSPF Version 2.


Before the emergence of OSPF, the Routing Information Protocol (RIP) is widely used on networks as an IGP.

RIP is a routing protocol based on the distance vector algorithm. Due to its slow convergence, routing loops, and poor scalability, RIP is gradually replaced by OSPF.

As a link-state protocol, OSPF can solve many problems encountered by RIP. Additionally, OSPF features the following advantages:

  • Receives or sends packets in multicast mode to reduce load on the Router that does not run OSPF.

  • Supports Classless Interdomain Routing (CIDR).

  • Supports load balancing among equal-cost routes.

  • Supports packet encryption.

With the preceding advantages, OSPF is widely accepted and used as an IGP.

Updated: 2019-05-17

Document ID: EDOC1000174069

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