3Com MSR 50 Series, Configuration Manual

Page: 917 / 2443

58
OSPF C
ONFIGURATION
Open Shortest Path First (OSPF) is a link state based interior gateway protocol
developed by the OSPF working group of the Internet Engineering Task Force
(IETF). At present, OSPF version 2 (RFC2328) is used.
When configuring OSPF, go to these sections for information you are interested in:
■
“Introduction to OSPF” on page 917
■
“OSPF Configuration Task List” on page 937
■
“Configuring OSPF Basic Functions” on page 939
■
“Configuring OSPF Area Parameters” on page 940
■
“Configuring OSPF Network Types” on page 941
■
“Configuring OSPF Routing Information Control” on page 942
■
“Configuring OSPF Network Optimization” on page 946
■
“Displaying and Maintaining OSPF Configuration” on page 954
■
“OSPF Configuration Examples” on page 955
■
“Troubleshooting OSPF Configuration” on page 968
Introduction to OSPF
n
Unless otherwise noted, OSPF refers to OSPFv2 throughout this document.
OSPF has the following features:
■
Scope: Supports networks of various sizes and can support several hundred
routers.
■
Fast convergence: Transmits update packets instantly after network topology
changes for routing information synchronization in the AS.
■
Loop-free: Computes routes with the Shortest Path Tree algorithm according to
the collected link states, so no loop routes are generated.
■
Area partition: Allows an AS to be split into different areas for ease of
management and the routing information transmitted between areas is
summarized to reduce network bandwidth consumption.
■
Equal-cost multi-route: Supports multiple equal-cost routes to a destination.
■
Routing hierarchy: Supports a four-level routing hierarchy that prioritizes the
routes into intra-area, inter-area, external type-1, and external type-2 routes.
■
Authentication: Supports interface-based packet authentication to guarantee
the security of packet exchange.