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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to OSPF

Introduction to OSPF

This section describes the definition and purpose 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: 2019-08-09

Document ID: EDOC1000041694

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