Design of Fault-Tolerant Interconnection Networks with Minimal Rerouting Hops

Abstract

In the design of fault-tolerant on interconnection networks, disjoint paths and dynamic rerouting are often used to tolerate faults. If a fault is known before the packet is sent, one of the different disjoint paths can be chosen to tolerate the faulty switches or links. Otherwise, a dynamic rerouting scheme is needed to tolerate the faulty switches or links dynamically. In this paper, we address the dynamic rerouting problem and present a network to tolerate faults. Besides guaranteeing one fault tolerance, the rerouting method minimizes the number of extra links traversed in finding such an alternative path. Furthermore, to tolerate multiple faults, we analysis the dynamic rerouting method and then propose another network to provide an alternative path at each stage when a switch or link is faulty or busy. By the result of comparisons among some important dynamic rerouting networks, our work performs well in fault-tolerant capability, rerouting hops, and hardware cost