Ospf Configuration; Ospf Overview; Introduction To Ospf; Ospf Route Calculation - H3C S5600 SERIES Operation Manual

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OSPF Configuration

When configuring OSPF, go to these sections for information you are interested in:

OSPF Configuration Task List

Displaying and Maintaining OSPF Configuration

OSPF Configuration Examples

Troubleshooting OSPF Configuration

The term router in this chapter refers to a router in a generic sense or an Ethernet switch running a

routing protocol.

OSPF Overview

Open Shortest Path First (OSPF) is a link state-based interior gateway protocol developed by IETF. At

present, OSPF version 2 (RFC 2328) is used, which has the following features:

High applicability: OSPF supports various networks in size, and even networks with up to several

hundred routers.

Fast convergence: OSPF can transmit update packets immediately after the network topology

changes so that the change can be synchronized in the autonomous system (AS).

Loop-free: Since OSPF calculates routes with the shortest path first algorithm according to the

collected link states, it guarantees that no loop routes will be generated.

Area partition: OSPF allows an autonomous system network to be divided into different areas for

convenient management so that routing information transmitted between the areas is summarized

further, thereby reducing network bandwidth consumption.

Equivalent route: OSPF supports multiple equivalent routes to the same destination.

Routing hierarchy: OSPF has a four-level routing hierarchy. It prioritizes the routes as intra-area,

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

Authentication: OSPF supports interface-based packet authentication to guarantee the security of

route calculation.

Multicast transmission: OSPF supports transmitting protocol packets in multicast mode.

Taking no account of area partition, the routing calculation process of the OSPF protocol is as follows:

Each OSPF-supported router maintains a link state database (LSDB), which describes the

topology of the whole AS. According to the network topology around itself, each router generates a

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