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RC-171
Cisco IOS XR Routing Configuration Guide
OL-14356-01
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.
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 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 3.2.2 Support was added for OSPFv3 Graceful Restart.
Release 3.3.0 Support was added for the following features:
• Multicast-Intact for OSPFv2
• Interface Association to a VRF
• OSPF Provider Edge to Customer Edge (PE-CE) Protocol
• Multiple OSPF Instances (OSPF Process and a VRF)
• RPL-based Type 3 Filtering
• LSA Pacing
Release 3.4.0 Support was added for the following features:
• OSPF Forwarding Adjacency
• OSPF SNMP Trap MIB
Release 3.4.1 Support was added for the multi-area adjacency feature.