A modular-network architecture for performance enhancement in extended local area network

A hierarchic-level bridged local area network (LAN) capable of interconnecting many LANs is presented. A routing strategy based on a spanning-tree-type algorithm which allows optimization of reconfiguration times, due to the possibility of selective network reconfiguration, is described. A limited extension of the filtering database is detailed. The solution enhances the standard spanning tree protocol by adding some important features which allow it to extend LAN bridging techniques to metropolitan or wider areas. The architecture is assessed using the Petri net theory. Performance indices allow assessment of mean amount of traffic lost following network reconfiguration, network availability, and network performance. The results are compared with those for a network of the same size, but managed by a standard spanning tree