How to monitor BGP sessions with Nagios
I had originally written this tutorial for xmodulo.com As a versatile network monitoring tool, Nagios can monitor the health of various network elements such as routers and switches. Among others, Nagios can be configured to monitor BGP sessions of a router, and generate alerts whenever there is something wrong in existing BGP sessions . Several BGP monitoring plugin tools exist for Nagios. These tools are useful in monitoring critical BGP peers of a router, and generating alerts for them. This tutorial will explain how to monitor BGP neighbors using Nagios plugin tools . Tested Platforms Tested and working perfectly with Cisco ASR 1000 series routers. Tested and working perfectly with Cisco 3700 series layer-3 switches. Should work with other Cisco devices as well. Tested and does NOT work with Quagga routers. Not tested on JunOS. Tested Topology Nagios will monitor all the BGP sessions for router-1. BGP neighbors AS 50 and AS 70 are vital for operation, s...