Network Bgp Diagnostics

This is a read-only BGP troubleshooting workflow that walks you through neighbor state checks, route policy inspection, and transport validation without touching session resets or config changes. It covers the full state machine (Idle, Active, OpenSent, Established) and includes specific show commands for route-maps, prefix-lists, and AS-path filtering. The included Python parser handles the common case where the rightmost column in show bgp summary is either a state name or a prefix count. What I like here is the discipline: it explicitly calls out that clearing sessions and changing authentication belong in a change window, not in your 3am triage script. If you're building BGP automation or just want a checklist that won't make things worse, this is a solid starting point.