You run an ISP (AS 64500). Watch BGP bring up sessions, learn a route to Content, and choose the best path.
BGP (Border Gateway Protocol) is the routing protocol that connects separate networks, called autonomous systems (ASes), to each other. It is how the whole internet learns how to reach every network. Unlike OSPF, BGP is driven by policy: operators decide which routes to prefer, accept and share based on business relationships such as customers, peers and transit providers.
Why it matters. Every ISP, cloud provider and large company connected to the internet runs BGP, and a policy mistake can redirect or drop traffic for many networks at once.
How to use this lab. Press Next to step through. The tabs below the map switch automatically as the story moves, and you can open any of them yourself. Try the two scenarios.
Where it fits. Do the OSPF lab first. OSPF finds paths inside a network, and BGP then connects networks together.
Simplified on purpose: one router per AS, one prefix to follow (203.0.113.0/24), and made-up AS numbers and addresses. The decision process is the real BGP ladder (local preference, AS-path length, origin, MED, eBGP over iBGP, router ID); Cisco also checks a vendor-specific “weight” first, which is left out. Timers shown are common defaults: 60 second keepalive, 180 second hold time.