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Strip_TechNotes

Troubleshooting BGP


Interactive: This document offers customized analysis of your Cisco device.


Contents

Introduction
Before You Begin
     Conventions
     Prerequisites
     Components Used
Main Troubleshooting Flowchart
Troubleshooting BGP Neighbor Establishment
Troubleshooting Routes Missing from the Routing Table
Troubleshooting Multihoming Inbound
Troubleshooting BGP Route Advertisement
Troubleshooting Multihoming Outbound
Related Information

Introduction

This document provides troubleshooting information for common problems with Border Gateway Protocol (BGP). To see more information, or to go to the next flowchart, click the command boxes in red.

If you have the output of a show ip bgp, show ip bgp neighbor, show ip bgp summary, or show tech-support command from your Cisco device, you can use to display potential issues and fixes. To use , you must be a registered customer, be logged in, and have JavaScript enabled.

Before You Begin

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Prerequisites

There are no specific prerequisites for this document.

Components Used

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

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.

Main Troubleshooting Flowchart

bgp_trouble_main.jpg

Troubleshooting BGP Neighbor Establishment

bgp_trouble_neighbor.jpg

Troubleshooting Routes Missing from the Routing Table

bgp_trouble_route_missing.jpg

Troubleshooting Multihoming Inbound

bgp_trouble_multi_in.jpg

Troubleshooting BGP Route Advertisement

bgp_trouble_route_adv.jpg

Troubleshooting Multihoming Outbound

bgp_trouble_multi_out.jpg


Related Information

BGP Neighbor EstablishmentRoutes not in Routing TableBGP Route AdvertisementMultihoming/LoadsharingBGP Error MessageBGP Memory ConsumptionBGP across PIX FirewallTroubleshooting Flapping BGP RoutesConfiguring and Verifying the BGP Conditional Advertisement FeatureWhy Do BGP Neighbors Toggle Between Idle, Connect, and Active States?Using the Extended ping and Extended traceroute CommandsContact the TACWhy Do BGP Neighbors Toggle Between Idle, Connect, and Active States?Troubleshooting Flapping BGP Routes (Recursive Routing Failure)Neighbor EstablishmentRoute AdvertisementUsing BGP for Interdomain RoutingContact the TACSample Configuration for Load SharingMultihoming OutboundLoad Sharing Using the Loopback Address as a BGP NeighborLoad Sharing when Dualhomed to One ISP through Multiple Local RoutersUsing BGP for Interdomain RoutingRoutes Announced Using a Basic Network StatementRoutes Announced Using the aggregate-address CommandRoutes Announced Using the Network Statement with a MaskRoutes Announced Using a Basic Network StatementUnable to Announce iBGP-Learned RoutesContact the TACLoad Sharing Using the Loopback Address as a BGP NeighborUsing BGP for Interdomain Routing Load Sharing when Multihomed to Two ISPs Through a Single Local RouterLoad Sharing when Multihomed to Two ISPs via Multiple Local RoutersTroubleshooting Load Balancing Over Parallel Links Using CEFSample Configuration for BGP with Two Different Service Providers (Multihoming)How to Use HSRP to Provide Redundancy in a Multihomed BGP Network

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Updated: Jun 16, 2003 Document ID: 22166