Build and break BGP best-path ties in a seven-router lab, testing Weight, Local Preference, AS_PATH, Origin, MED, eBGP vs. iBGP, IGP cost, multipath, route reflection, and the final tie-breakers that determine which route wins.

Follow BGP routes across multiple autonomous systems and see how AS_PATH, route propagation, loop prevention, and best-path selection work in a real lab.

Learn the core concepts behind BGP, including autonomous systems, eBGP vs. iBGP, peer communication, neighbor states, message types, route advertisements, and AS_PATH.