283 results about "Span tree" patented technology

An apparatus and method for a spanning tree network. A communication device can connect to a piconet network and the communication device can transmit at least one available piconet identifier prior to receiving a request for the available piconet identifier from a dependent communication device, the available piconet identifier providing a parent piconet coordinator identification for the dependent communication device. A dependent communication device can connect to the piconet network, determine if the communication device can support a dependent piconet, and receive at least one available piconet identifier prior to requesting information regarding establishing a dependent piconet, the available piconet identifier providing parent piconet identification for the communication device for the dependent piconet.

A method for managing energy in a sensor network environment using a spanning tree includes the steps of collecting amount of remaining energy of nodes at a predetermined cycle by a base station in a region having a number of clusters a number of nodes forming a spanning tree in each cluster; assigning a number of links for connecting the nodes to each cluster; determining a maximum number of allowable links of the nodes; and updating the spanning tree based on the maximum number of allowable links.

One embodiment of the present invention provides a system that prevents loops from occurring when spanning tree configuration messages are lost while executing a spanning tree protocol on bridges in a network. During operation, the system executes the spanning tree protocol on a bridge. This spanning tree protocol configures each port coupled to the bridge into either a forwarding state, in which messages are forwarded to and from the port, or a backup state, in which messages are not forwarded to or from the port. The system also monitors ports coupled to the bridge to determine when messages are lost by the ports. If one or more messages are lost on a port, the system refrains from forwarding messages to or from the port until no messages are lost by the port for an amount of time.

This invention first presents SRAM based pipeline IP lookup architectures including an SRAM based systolic array architecture that utilizes multi-pipeline parallelism idea and elaborates on it as the base architecture highlighting its advantages. In this base architecture a multitude of intersecting and different length pipelines are constructed on a two dimensional array of processing elements in a circular fashion. The architecture supports the use of any type of prefix tree instead of conventional binary prefix tree. The invention secondly proposes a novel use of an alternative and more advantageous prefix tree based on binomial spanning tree to achieve a substantial performance increase. The new approach, enhanced with other extensions including four-side input and three-pointer implementations, considerably increases the parallelism and search capability of the base architecture and provides a much higher throughput than all existing IP lookup approaches making, for example, a 7 Tbps router IP lookup front end speed possible. Although theoretical worst-case lookup delay in this systolic array structure is high, the average delay is quite low, large delays being observed only rarely. The structure in its new form is scalable in terms of processing elements and is also well suited for the IPv6 addressing scheme.