Design of Parallel Packet Switch Simulation System Based on NS2

Parallel packet switch (PPS) is used intensively in today's high-performance routers. But the lack of a simple simulation method negatively affects the evolution of PPS. In this paper, we propose a novel and practical way to evaluate the performance of PPS based on NS2, through which PPS can be a module extension for NS2 library by deriving from base classes and modifying the procedure of packet forwarding in NS2. We take an improved PPS structure which can support differentiated quality of service (QoS) as an example to show that: by this method, coding in relevant functions can achieve particular PPS which is provided with characteristics for research requirements. Simulation results and theoretical analysis show the implementation capacity.