CHAPTER 7
Implementing OSPF
Open Shortest Path First (OSPF) is an Interior Gateway Protocol (IGP) developed by the OSPF working group
of the Internet Engineering Task Force (IETF). Designed expressly for IP networks, OSPF supports IP
subnetting and tagging of externally derived routing information. OSPF also allows packet authentication
when sending and receiving packets.
OSPF Version 3 (OSPFv3) expands on OSPF Version 2, providing support for IPv6 routing prefixes.
This module describes the concepts and tasks you need to implement both versions of OSPF on your Cisco
NCS 6000 Series Router . The term “OSPF" implies both versions of the routing protocol, unless otherwise
noted.
For more information about OSPF on Cisco IOS XR software and complete descriptions of the OSPF commands
listed in this module, see the Related Documents, on page 341 section of this module. To locate documentation
for other commands that might appear during execution of a configuration task, search online in the
Note
Feature History for Implementing OSPF
This feature was introduced.Release
5.0.0
• Prerequisites for Implementing OSPF , on page 257
• Information About Implementing OSPF , on page 258
• How to Implement OSPF , on page 280
• Configuring IP Fast Reroute Loop-free Alternate, on page 322
• Configure Remote Loop-Free Alternate Paths for OSPF, on page 326
• Configuration Examples for Implementing OSPF , on page 334
• Where to Go Next, on page 340
• Additional References, on page 340
Prerequisites for Implementing OSPF
The following are prerequisites for implementing OSPF on Cisco IOS XR software:
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
257
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