RFC 2106 DLSRAP February 1997 2. Overview 2.1. DRAP Client/Server Model +-----------+ +-----------+ +---------+ | Mainframe | | IP Router +- ppp -+ DLSw | +--+--------+ +-----+-----+ | Work | | | | Station | | | +---------+ +--+--+ +-------------+ | | FEP +- TR -+ DLSw Router +-- IP Backbone +-----+ +-------------+ | | | +-----------+ +---------+ | IP Router +- ppp -+ DLSw | +-----+-----+ | Work | | Station | +---------+ | DLSw Session | +-------------------------------+ Figure 2-1. Running DLSw on a large number of workstations creates a scalability problem. Figure 2-1 shows a typical DLSw implementation on a workstation. The workstations are connected to the central site DLSw router over the IP network. As the network grows, scalability will become an issue as the number of TCP sessions increases due to the growing number of workstations. Chiang, et. al. Informational