RC-169
Cisco IOS XR Routing Configuration Guide
Implementing OSPF on Cisco IOS XR Software
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.
Implementing OSPF version 3 (OSPFv3) expands on OSPF Version 2, to provide support for IPv6
routing prefixes.
This module describes the concepts and tasks you need to implement both versions of OSPF on your
Cisco IOS XR router. The term “OSPF” implies both versions of the routing protocol, unless otherwise
noted.
Note For more information about OSPF on the Cisco IOS XR software and complete descriptions of the OSPF
commands listed in this module, see the “Related Documents” section of this module. To locate
documentation for other commands that might appear during execution of a configuration task, search
online in the Cisco IOS XR software master command index.
Feature History for Implementing OSPF on Cisco IOS XR Software
Release Modification
Release 2.0 This feature was introduced on the Cisco CRS-1.
Release 3.0 No modification.
Release 3.2 Support was added for the Cisco XR 12000 Series Router.
Release 3.3.0 The following tasks were added:
•Configuring OSPFv3 Graceful Restart
•Enabling Multicast-Intact for OSPFv2
•Configuring the Multi-VRF Capability for OSPF Routing
•Associating Interfaces to a VRF
•Configuring OSPF as a Provider Edge to Customer Edge (PE-CE)
Protocol
•Configuring LDP-IGP Synchronization
•Creating Multiple OSPF Instances (OSPF Process and a VRF)