Traffic Shaping at Differentiated Services Enabled Edge Router Using Adaptive Packet Allocation to Router Input Queue

Differentiated Services provide Quality of Service within a domain by aggregation of flows. There are mainly four modules which work together in Differentiated Services Classifier, Meter, Marker, and Shaper/Dropper. When congestion increases at Differentiated Services enabled router, Quality of Service is maintained according to the priority of packets by dropping lower priority packets, providing high preference to high-priority packets. As the buffer space is limited in routers, at time of congestion buffer management plays a crucial role to provide Quality of Service. In this paper work is focused on allocating buffer to incoming traffic adaptively according to current availability of resource and priority required by packets. Here, we address congestion control issues at Differentiated Services enabled edge routers using dynamic allocation of virtual queues (precedence queues) to incoming traffic at edge router by shifting lower priority packets to higher priority queues (if under-utilized).