BGP World
Updated Mar 6, 2026
Your all-in-one BGP companion. Browse the 6-state finite state machine with troubleshooting guidance, explore 9 path attributes with real-world gotchas, walk through the 11-step best-path selection algorithm, understand peering models (iBGP, eBGP, route reflectors, confederations), grab ready-to-paste commands for Cisco, Junos, and FRR, and search a curated knowledgebase covering 10 core BGP topics.
Built from real-world scenarios encountered in production ISP and enterprise networks. Whether you're studying for a certification or debugging a live outage, BGP World has you covered.
Welcome to BGP World
BGP (Border Gateway Protocol) is the routing protocol that holds the internet together. Every ISP, cloud provider, and large enterprise uses it to exchange routing information between autonomous systems.
BGP is powerful but notoriously complex to troubleshoot. Sessions can get stuck in unexpected states, routes can disappear due to subtle policy issues, and path selection behavior can be confusing when multiple attributes interact.
BGP World is your one-stop reference hub. Use the BGP Doctor for interactive troubleshooting, Paste & Diagnose to analyze raw CLI output automatically, browse Common Problems for quick fixes, explore the state machine, understand path attributes, learn the best-path algorithm, grab platform commands, and search the knowledgebase.