Ospf Overview; Introduction To Ospf; Chapter 4 Ospf Configuration - H3C S5600 Series Operation Manual

Operation Manual – Routing Protocol
H3C S5600 Series Ethernet Switches

Chapter 4 OSPF Configuration

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

OSPF Overview

OSPF Configuration Task List
Displaying and Maintaining OSPF Configuration
OSPF Configuration Example
Troubleshooting OSPF Configuration
Note:
The term router in this chapter refers to a router in a generic sense or an Ethernet
switch running a routing protocol.
4.1 OSPF Overview

4.1.1 Introduction to OSPF

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.
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Chapter 4 OSPF Configuration