CHAPTER 6
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
and uses IP multicast 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 ASR 9000 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 421 section of this module. To locate
documentation for other commands that might appear during execution of a configuration task, search
online in the Cisco ASR 9000 Series Aggregation Services Router Commands Master List
Note
Feature History for Implementing OSPF
ModificationRelease
This feature was introduced.Release 3.7.2
Support was added for the following features:
•
OSPFv2 SPF Prefix Prioritization.
•
IP fast reroute loop-free alternates computation
•
Warm Standby for OSPF Version 3
Release 3.9.0
Support was added for the following features:
•
OSPFv2 Fast Re-route Per-Prefix Computation
•
OSPFv3 Non-stop Routing (NSR)
Release 4.2.0
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 331
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