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S600-E V200R013C00 Configuration Guide - IP Unicast Routing

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, Routing Policy, IP Routing Table Management, and PBR.
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Overview of OSPF

Overview of OSPF

Definition

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 in this document refers to OSPF Version 2.

OSPF constructs network topologies and routing tables by:
  • Dividing an Autonomous System (AS) into one or more logical areas

  • Advertising routes by sending Link State Advertisements (LSAs)

  • Exchanging OSPF packets between devices in an OSPF area to synchronize routing information

  • Encapsulating OSPF packets into IP packets and then sending the packets in unicast or multicast mode

Purpose

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

RIP is a 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 Inter-Domain Routing (CIDR)

  • Load balancing among equal-cost routes

  • Packet encryption

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Updated: 2019-04-08

Document ID: EDOC1100066165

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