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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

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Overview of OSPF

Overview of OSPF


The Open Shortest Path First (OSPF) protocol is 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


Prior to the emergence of OSPF, the Routing Information Protocol (RIP) was the most widely used IGP.

RIP is a distance-vector routing protocol. Due to RIP's slow convergence, routing loops, and poor scalability, OSPF is now the most widely accepted and used IGP.

OSPF is a link-state routing protocol featuring:

  • Multicast packet transmission to reduce load on the switches that are not running OSPF

  • Classless Inter-Domain Routing (CIDR)

  • Load balancing among equal-cost routes

  • Packet authentication

Updated: 2020-02-04

Document ID: EDOC1000178324

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