The document discusses a basic BGP lab scenario to demonstrate BGP configuration and operation. It describes a network with two ISPs connected to an AS through two boundary routers. In the initial scenario, EBGP is configured between the ISPs and boundary routers, with IGP (RIPv2) routing within the AS. The boundary routers cannot reach networks attached to the opposite ISP due to the lack of IBGP. Configuring IBGP allows the boundary routers to exchange routes and reach all networks.