CHAPTER 3
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 software.
The term “OSPF" implies both versions of the routing protocol, unless otherwise noted.
1. VPNv4, VPNv6 and VPN routing and forwarding (VRF) address families will be supported in a future
release.
2. GTSM TTL Security is not supported.
Note
• Prerequisites for Implementing OSPF , on page 46
• Enable OSPF, on page 46
• Verify OSPF Configuration and Operation, on page 48
• Stub Area, on page 51
• Neighbors and Adjacency for OSPF, on page 54
• Authentication Strategies, on page 58
• Control Frequency That Same LSA Is Originated or Accepted for OSPF, on page 61
• Virtual Link and Transit Area for OSPF, on page 63
• Summarize Subnetwork LSAs on OSPF ABR, on page 68
• Route Redistribution for OSPF, on page 71
• Nonstop Forwarding for OSPF Version 2, on page 73
• OSPF Shortest Path First Throttling, on page 76
• Graceful Restart for OSPFv3, on page 79
• Warm Standby and Nonstop Routing for OSPF Version 2, on page 81
• Warm Standby and Nonstop Routing for OSPF Version 3, on page 82
• OSPFv2OSPF SPF Prefix Prioritization, on page 83
• Configure OSPF as a Provider Edge to Customer Edge (PE-CE) Protocol, on page 88
• Create Multiple OSPF Instances (OSPF Process and a VRF), on page 90
• Label Distribution Protocol IGP Auto-configuration for OSPF, on page 92
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
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