Introduction To Ospf - 3Com Switch 4800G 24-Port Configuration Manual

28

Introduction to OSPF

OSPF C
n
The term "router" in this document refers to a router in a generic sense or a Layer
3 switch.
Open Shortest Path First (OSPF) is a link state 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 273
■
"OSPF Configuration Task List" on page 292
■
"Configuring OSPF Basic Functions" on page 293
■
"Configuring OSPF Area Parameters" on page 294
■
"Configuring OSPF Network Types" on page 295
■
"Configuring OSPF Route Control" on page 297
■
"Configuring OSPF Network Optimization" on page 300
■
"Configuring OSPF Graceful Restart" on page 306
■
"Displaying and Maintaining OSPF" on page 309
■
"OSPF Configuration Examples" on page 309
■
"Troubleshooting OSPF Configuration" on page 323
■
n
Unless otherwise noted, OSPF refers to OSPFv2 throughout this document.
OSPF has the following features:
Wide scope: Supports networks of various sizes and up to several hundred
■
routers in an OSPF routing domain.
Fast convergence: Transmits updates instantly after network topology changes
■
for routing information synchronization in the AS.
Loop-free: Computes routes with the shortest path first (SPF) algorithm
■
according to the collected link states, so no route loops 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.
■
ONFIGURATION