LAN based applications, including new voice and multi-media solutions, are increasingly mission critical and require much improved network availability and scalability. An availability strategy that includes redundant bridges and LAN media, together with rapid failure detection and reconfiguration, allows the use of currently available cost effective LAN components. Techniques that are broadly compatible with 802.1D-1998, but not interoperable, are now emerging from multiple vendors. The proposed project will provide users with interoperable solutions.