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Parallel packet switching using multiplexors with virtual input queues

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2 Author(s)
Aslam, A. ; Dept. of Comput. Sci. & Eng., Univ. of South Florida, Tampa, FL, USA ; Christensen, K.

Parallel packet switches (PPS) use internal, parallel switch planes that operate at less than line speed. A PPS can scale-up to faster line speeds than a single-plane switch can. Load balancing between planes and providing QoS to flows are open problems. We investigate the performance of a new "VIQ PPS" that distributes cells or variable-length packets to planes and uses multiplexors with virtual input queues (VIQ). A VIQ at an output multiplexor consists of one FIFO queue for each input. Simulation is used to evaluate the performance of a 10-Gbps VIQ PPS that contains ten 1-Gbps switch planes. It is found that at high offered loads the mean delay of a VIQ PPS switch is lower than that of a single-plane iSLIP switch. For unbalanced loads, the VIQ PPS demonstrates stability where an iSLIP switch is unstable. Especially promising results are shown for VIQ PPS native switching of variable-length Ethernet packets.

Published in:

Local Computer Networks, 2002. Proceedings. LCN 2002. 27th Annual IEEE Conference on

Date of Conference:

6-8 Nov. 2002

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