Cisco Systems IOS XR Manual De Usuario

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.

For more information about OSPF on the Cisco IOS XR software and complete descriptions of the OSPF 
commands listed in this module, see the 

 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.

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)