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Troubleshooting When BGP Routes Are Not Advertised
This document describes how to troubleshoot flapping Border Gateway Protocol (BGP) routes caused by recursive routing failure.
10 Aug 2005
BGP is an exterior gateway protocol (EGP), used to perform interdomain routing in TCP/IP networks. A BGP router needs to establish a connection (on TCP port 179) to each of it's BGP peers before BGP updates can be exchanged. The BGP session between two BGP...
11 May 2006
This Tech Note explains the behavior of Open Shortest Path First (OSPF) to Border Gateway Protocol (BGP) redistribution on Cisco routers. The behavior of OSPF to BGP redistribution is outlined in RFC 1403.
28 Feb 2012
This document provides a sample configuration of a Multiprotocol Label Switching (MPLS) VPN over ATM when Border Gateway Protocol (BGP) or Routing Information Protocol (RIP) is present on the customer's site.
16 Nov 2007
Valuable time and resources are often wasted to replace hardware that actually functions properly. This document helps troubleshoot common hardware issues with the Cisco 7500 Series Router and, more specifically, its Route Switch Processor (RSP) card. This document provides pointers...
25 Sep 2006
Load sharing allows a router to distribute the outgoing and incoming traffic among multiple paths. The paths are derived either statically or with dynamic protocols, such as:
23 Aug 2005
This document discusses the removal of the private autonomous system numbers in BGP.
10 Aug 2005
This document explains the symptoms and possible causes of memory allocation failure (MALLOCFAIL), and offers guidelines for troubleshooting memory problems.
28 Nov 2006
When you have IP connectivity problems in a NAT environment, it is often difficult to determine the cause of the problem. Many times NAT is mistakenly blamed, when in reality there is an underlying problem. This document demonstrates how to verify NAT operation using tools available on...
25 Sep 2008
This document explains how to configure interVLAN routing with Cisco Catalyst 3750/3560/3550 series switches. The document provides a sample configuration for interVLAN routing with a Catalyst 3550 series switch that runs enhanced multilayer image (EMI) software in a typical network scenario....
23 Feb 2012