We take advantage of the hierarchical structure of the star graph network to obtain an efficient method for constructing node-disjoint paths between arbitrary pairs of nodes in the network. A distributed faulttolerant routing algorithm for the star network based on this construction method is then presented and evaluated. The proposed algorithm adapts the routing decisions in response to node failures. Node failure and repair conditions may arise dynamically (at any time) provided that the total number of faulty nodes at any given time is less than the nodeconnectivity n-1 of the n-star. We show that if the node failures occur 'reasonably' apart in time, then all messages will be routed on paths of length ? + ? where ? is the minimum distance between the source and the destination and e is 0, 2, or 4. In the unlikely case where more failures occur in a 'short period', the algorithm still delivers all messages but via possibly longer paths.
['Khaled Day', 'Abdel Elah Al-Ayyoub']
Reliable communication in faulty star networks