A method and an apparatus dynamically controls a sleep mode in an MS in a packet-based communication system. In the rotating body, at least one of the bearings includes a metal inner ring portion having a bearing hole and a resin outer ring portion having first and second portions. Each spine switch is assigned a common Layer 2 and 3 network address, while each leaf switch is configured with an inter-layer link selection protocol to selectively connect only one active inter-layer link between the leaf switch and the wide area layer while disabling all other available inter-layer links between the leaf switch and the wide area layer.