siavash khorsandi - dept.of computer eng.amirkabir univ.of technology tehran . Iran

today service provider networks have to deal with large number of connections running fromhomes or business offices directly to the swithcing centers. To keep the complexity of configuration , resource provisioning and management of networks at a manageable level traffic aggre gation at various levels is needed to form high volume traffic flows that are treated in the network as a whole subtending is an effective way of traffic aggregation at the access provided that the service quality of the users is invariant of their location in the chain of aggregating elements. in this paper we provide a nonprobabilistic analysis of spatial fairness in subtending architecture.