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Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Main Flowchart
Troubleshoot OSPF Neighbor States
Troubleshoot the OSPF Routing Table
Troubleshoot OSPF Init State
Troubleshoot OSPF MTU
Troubleshoot OSPF Corrupt Packets
Troubleshoot OSPF Two-Way State
Troubleshoot OSPF Links
Troubleshoot Full Adjacency
Troubleshoot External Link-State Advertisements
Troubleshoot OSPF NBMA Networks
Troubleshoot Access Lists
Troubleshoot Neighbors over PRI
Troubleshoot Ping
Troubleshoot the OSPF Interface
Troubleshoot Frame Relay Environment
Troubleshoot External Route Problems
Troubleshoot Network Type
Troubleshoot OSPF Area Type
Troubleshoot the Hello/Dead Interval
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Introduction

This document provides troubleshooting information for common problems with Open Shortest Path First (OSPF). To see more infomation, or to go to the next flowchart, click the command boxes in red.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Main Flowchart

If you have the output of a show ip ospf neighbor, show ip ospf neighbor, or show tech-support command from your Cisco device, you can use Output Interpreter ( registered customers only) to display potential issues and fixes. To use Output Interpreter, you must have JavaScript enabled.

Troubleshoot OSPF Neighbor States

Refer to OSPF Neighbor States for neighbor state descriptions.

Troubleshoot the OSPF Routing Table

Troubleshoot OSPF Init State

Refer to Why Does the show ip ospf neighbor Command Reveal Neighbors in the Init State? for an Init State problem description and troubleshooting steps.

Troubleshoot OSPF MTU

Troubleshoot OSPF Corrupt Packets

Troubleshoot OSPF Two-Way State

Refer to Why Does the show ip ospf neighbor Command Reveal Neighbors Stuck in 2-Way State? for an OSPF Two-way State problem description and troubleshooting steps.

Troubleshoot OSPF Links

Troubleshoot Full Adjacency

Troubleshoot External Link-State Advertisements

Refer to Common Routing Problem with OSPF Forwarding Address for a description of forwarding addresses in external LSA, and for troubleshoot steps concerning the most common problems with LSAs having non-zero forwarding addresses.

Troubleshoot OSPF NBMA Networks

Refer to Problems with Running OSPF in NBMA Mode over Frame Relay for more information on common OSPF over NBMA network problems.

Contents