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Configuring OSPF

Hardware compatibility

The A5500 SI Switch Series does not support OSPF.

Overview

Open Shortest Path First (OSPF) is a link state interior gateway protocol developed by the OSPF working

group of the IETF. Now, OSPF version 2 (RFC 2328) is used. Unless otherwise noted, OSPF refers to

OSPFv2 throughout this chapter. The term "router" in this chapter refers to both routers and Layer 3

switches.

OSPF has the following features:

• Wide scope—Supports various network sizes and up to several hundred routers in an OSPF routing

domain.

• Fast convergence—Transmits routing updates instantly upon network topology changes.

• Loop-free—Computes routes with the shortest path first (SPF) algorithm to avoid routing loops.

• Area-based network partition—Splits an AS into different areas to facilitate management. In

addition, routing information transmitted between areas is summarized to reduce traffic and routing

table sizes.

• Equal-cost multi-path (ECMP) routing—Supports multiple equal-cost routes to a destination.

• Routing hierarchy—Supports a four-level routing hierarchy that prioritizes routes into intra-area,

inter-area, external Type-1, and external Type-2 routes.

• Authentication—Supports area- and interface-based packet authentication to ensure the security of

packet exchange.

• Support for multicast—Multicasts protocol packets on some types of links.

Basic concepts

Autonomous System

An Autonomous System (AS) comprises a group of routers that run the same routing protocol.

OSPF route computation

OSPF computes routes in an area as follows:

• Based on the network topology around itself, each router generates Link State Advertisements (LSAs)

and sends them to other routers in update packets.

• Each OSPF router collects LSAs from other routers to compose a link state database (LSDB). An LSA

describes the network topology around a router, and the LSDB describes the entire network

topology of the AS.

• Each router transforms the LSDB in the area to a weighted directed graph, which is the topology of

the entire network. All the routers of the area have the same graph.

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