Abstract:

With indepth study and analysis about the existing parallel packet switching (PPS) scheduling mechanism, a PPS scheduling for differentiated quality of service (QoS) based on identifier is proposed which is introduced to switch fabric. The network data flow in denomination of traffic classes is managed by the mechanism. The packets sequence for each traffic stream by queuing in order is ensured by the scheme. At the same time, if set a small amount of buffer in the multiplexer, double pointer round robin scheduling algorithm could be adopted to provide differentiated QoS guarantee for different traffics,which ensured the switch provide effective support for different highlevel traffic classes. Simulation indicates that the throughput of the mechanism reaches up to 99% at full load, and can be accordance to the reservation bandwidth to allocate the bandwidth of output links, and ensure that packets have an upper delay bound, and also can balance the load to the exchange planes.

Key words: identifier, parallel switch based on combined input and crosspoint queue, differentiated quality of service, send cells in order delivery, scheduling algorithm