Ospf Overview; Introduction To Ospf; Chapter 4 Ospf Configuration - Huawei Quidway S3900 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S3900 Series Ethernet Switches-Release 1510

Chapter 4 OSPF Configuration

Note:
Among S3900 series, only S3900-EI series support OSPF 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 networks of various sizes and can support 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 tree algorithm
according to the collected link states, it guarantees that no loop routes will be
generated from the algorithm basis.
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 abstracted 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.
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Chapter 4 OSPF Configuration