175 results about "Switching table" patented technology

A layer-3 virtual router connects two or more virtual networks. Virtual networks are overlaid upon physical networks. Each virtual network (VN) is a layer-2 network that appears to expand an organization's LAN using virtual MAC addresses. The network stack forms a virtual-network packet with a virtual gateway MAC address of the virtual router to reach a remote virtual network. A VN device driver shim intercepts packets and their virtual MAC and IP addresses and encapsulates them with physical packets sent over the Internet. A VN switch table is expanded to include entries for nodes on the remote virtual network so that all nodes on both virtual networks are accessible. A copy of the VN switch table is stored on each node by a virtual network management daemon on the node. A Time-To-Live field in the virtual-network packet is decremented for each virtual hop and a checksum recalculated.

A virtual network is overlaid upon physical networks. The virtual network is a layer-2 network that appears to expand an organization's LAN using virtual MAC addresses. A VN device driver shim intercepts LAN packets and their virtual MAC and IP addresses and encapsulates them with physical packets that can be routed over the Internet. As new nodes are created, a VN switch table is expanded so that all nodes on the virtual network can reach the new node. A copy of the VN switch table is stored on each node by a virtual network management daemon on the node. A VN configuration controller in a central server updates the VN switch tables. Organizations can expand their virtual network as nodes are created at remote cloud computing providers without action by the staff at the cloud computing provider. Hybrid cloud virtual networks include on-premises physical and virtual-machine nodes, and off-premises guest nodes and instances.

A LAN includes a router that is connected to two or more racks of servers and each of the servers can support a plurality of virtual machines. The router is configured to forward data packets based on IP destination addresses or based on destination MAC addresses and builds and maintains forwarding tables in support of data packet forwarding in the layer 3 and the layer 2 network environment. In support of layer 2 forwarding, the router builds and maintains an aggregated MAC switching table that is comprise of a subset of the table entries typically needed to switch packets to their destination, and in support of layer 3 forwarding, the router or switch builds and maintains an aggregated ARP forwarding table that is comprised of a subset of the table entries typically needed to forward packets to their destination.

Method for processing content of an Internet Protocol (IP) packet and method for processing a full broadcast IP packet. Processing content of an IP packet includes: extracting IP source and destination addresses and payload from the IP packet; and generating an IP frame encapsulating the IP source and destination addresses and the payload between a preamble field and an error checking field. Processing a full broadcast IP packet includes: receiving the full broadcast IP packet including an IP source address and a full broadcast IP destination address; ascertaining a closest matching IP address and a subnet thereof in a switching table of an IP switch; replacing the full broadcast IP destination address in the IP packet with a subnetted source address generated by applying the subnet mask to the IP source address; transmitting the IP packet to all IP addresses in the switching table within the subnetted source address.

One embodiment disclosed relates to a method of load balancing traffic in a switching mesh. A packet is received at a switch of the mesh. A MAC destination address is gathered from the packet. An entry in a MAC address table is found with the MAC destination address, and a switch identifier associated with the MAC destination address is obtained. An entry in a switch table is found with the switch identifier, and data associated with the switch identifier is obtained. A hash function is used on field data from the packet to generate a hash value, and the hash value and the associated data are used to generate an index value. An entry in the tag table is found with the index value, and a path tag associated with the index value is obtained. The path tag is inserted into the packet. The path tags may be weighted.

A method of balancing the voltage of DC links in a cascaded multi-level converter (CMC) semiconductor circuit, including the steps of providing a plurality of H-bridge converters per phase in the CMC circuit and utilizing a three phase duty cycle value from the main controller to determine a normalized duty cycle value, a ceiling duty cycle value and a floor duty cycle value. The normalized duty cycle value and an output current of the CMC is used to determine the direction and polarity of a capacitor current, and utilizing the capacitor current to determine a plurality of output capacitor voltages. A voltage summation result and direction is obtained from a ceiling index pointer and a floor index pointer and the voltage summation result, direction from the ceiling index pointer and a floor index pointer are used to create a combined switching table for the H-bridge converters. A pulse width modulator is utilized to balance the voltage of the DC links and thereby eliminate DC-capacitor voltage imbalance.

Methods for modifying a switching table of an Internet Protocol (IP) switch. The methods include: receiving a dynamic host configuration protocol (DHCP) option 43 request from a host of a LAN at an access port of the IP switch; transmitting the request to a DHCP server; intercepting a DHCP response for the request from the DHCP server; extracting an IP address from the intercepted DHCP response; and adding the extracted IP address to a corresponding entry (specific to the access port) of a switching table of the IP switch. The methods include: receiving an IP frame at an access port of the IP switch; reading an IP source address from the IP frame; and in the switching table either: creating a new entry including the IP source address and its associated port identifier or changing an existing entry based on the IP source address and the access port.

A stacked switch includes two or more individual network switches connected to each other in a ring or daisy chain topology over stacking links, and at least one port on two or more of the individual switches comprising the stacked switch is a member of a LAG configured on the stacked switch. Each of the individual switches comprising the stacked switch include control plane and data plane functionality that operates to maintain switching tables and to process network data ingressing to the switch to determine how to forward the network data through the switch to an egress point. The control functionality included in each of the switches comprising the stacked switch also includes an enhanced ECMP functionality that operates to optimize the use of stacking link bandwidth on the stacking links connecting the two or more individual switches to each other.

A system and method for dynamic selection of a database identifier, associated with a database, based on application program requirements in a Financial Service Organization (FSO) business transaction processing system. Developers may build application programs for FSO business transactions with increased flexibility to changing business requirements and reduced development time. The dynamic database packageset software, which may comprise of a dynamic database packageset table, may provide functionality to isolate the FSO application program source code from changes to the FSO database. The FSO computer system may include one or more processing parameters. A processing parameter may have one key definition, one or more key values with one processing parameter value assigned to each key value. The dynamic database packageset switching table may include user defined keys and their associated database identifier values. Configuring the dynamic packageset switching table may include defining user defined keys and their associated database identifier values. User defined key definitions may include providing a user interface for the selection of one or more data elements to be used as key elements in the key definition. The user interface may also allow the specification of a sequence in which the key elements will appear in the key definition.

The method described here provides for high-speed, Quality of Service (QoS) driven, and secure transport of voice, video and data packets for facilitating the convergence of multiple networking facilities into one. The method involves replacing one or more bits in the IP header address fields and replacing them with or adding to them unique virtual connection or virtual circuit (VC) identifiers for node-to-node, that is device-to-device, connectivity as well as for representing values or parameters for packet type, QoS, security, network management and node / link resources. Identifiers for the above parameters are developed and saved at each node as a switching table. The values representing the identifiers from a switching table are used to assign virtual connections as well as control the flows of packets.

Internet Protocol (IP) switch and method for switching an IP frame to an IP destination address. The IP switch includes access ports, interswitch ports, and a switching table. Each access port is connected to a corresponding host in a LAN. The interswitch ports are configured to be statically connected to routers within the Internet in connections that cannot be overwritten by dynamic learning. The switching table includes entries, each entry having an IP address, a port identifier, and a routing protocol internal metric indicative of confidence in the entry. The method for switching the IP frame includes: receiving the IP frame, reading the IP destination address from the IP frame, ascertaining a matching IP address in the switching table that matches the IP destination address, directing the IP frame to a specific port, transmitting the IP frame from the specific port to the IP destination address.

The invention discloses a mobile terminal wifi switching method. The method comprises the steps that the information of an access wifi hotspot before a mobile terminal and the information of a current access wifi hotspot are acquired and sent to a server database; the server establishes a wireless access point switching table according to the wifi hotspot information, and calculates user's next wifi hotspot with the largest switching probability and other possible switching wifi hotspots; and finally, according to the calculated wifi hotspot switching probability and monitored real-time signal strength of each wifi hotspot, an optimal wifi hotspot is selected for switching. According to the mobile terminal wifi switching method, in a switching process, the information of the current access point and the information of a previous access point are considered; based on historical information, a next access point is selected; and if the moving trajectory of the mobile terminal is fixed, the scan time delay of the switching process can be effectively shortened when a next access point is selected according to the switching method.

The invention belongs to the technical field of intelligent network vehicle safety, disclosed are a vehicle intelligent safety gateway with an isolation disaster preparedness management and control mechanism and a management and control method, at first, the data of each isolation domain is sent to the gateway through a matching transceiver. The protocol conversion module of the gateway analyze the data packet to extract the content of the data packet, and then detects the content accord to the rules of the management and control module and processes the content according to the rules. The data packets detected by the rules are queried in the switching table of the switching module, forwarded according to the indicated interface, and the operations such as logging, backup and recovery arecarried out according to the rules. The invention provides a basis for statistics of various data; In addition to supporting the traditional vehicle bus, but also equipped with vehicle Ethernet chip,support vehicle Ethernet, can interface with the latest intelligent car.

In a region switching table, address regions covering a memory space are defined, and operations which can access the regions in domains corresponding to components of a program are listed. A domain number which indicates a domain corresponding to a component of the program under execution, and a region number which indicates a region including an address which is accessed immediately before are held in respective registers. The apparatus includes an access check unit which issues a first interruption, if the processor request address (VA) falls outside a region boundary. The access check unit also issues a second interruption, if the processor request operation code (OP) is not permitted according to a permission attribute corresponding to the domain number of the region including the processor request address (VA). The access check unit writes interrupt factors in a register, if the first interruption or the second interruption has been occurred.

The invention provides a network connection processing method, a network connection processing device, and a network connection processing terminal. The network connection processing method is characterized in that after a terminal is connected, AP information of various wireless access points AP, which can be used for wireless connection, and can be scanned by the terminal, can be acquired, and the AP information comprises AP identifications and signal intensities; an AP switching table can be generated according to the AP identifications and the signal intensities of the AP information, and comprises the AP information of at least two wireless access points AP; when the signal intensities of the AP of the AP switching table exceeds the signal intensity of the current AP connected with the terminal, the wireless connection with the terminal can be disconnected automatically. According to the invention, whether the wireless network connection between the terminal and the current AP is required to be disconnected can be determined, and the terminal can be wirelessly connected with the wireless access point AP having the better AP signal intensity, and therefore the convenience and fast speed of the network connection processing can be improved, and the network using requirement of the user can be guaranteed to a certain degree, and the user experience can be improved.

The invention discloses a direct torque control method for a non-salient pole type hybrid excitation motor for an electric vehicle. According to the method, on the basis of a partition control strategy for the hybrid excitation motor, set values of a stator magnetic chain and excitation current are calculated by a maximum torque current ratio algorithm in different running regions; a switch table is inquired according to the set value of the torque, the set value of the magnetic chain and difference values of respective feedback values to select a voltage vector, thus a switching state of a PWM (pulse width modulation) inverter is controlled and the direct torque control over the hybrid excitation motor is realized. According to the direct torque control method, on the premise of guaranteeing the basic running characteristic of the hybrid excitation motor, the direct torque control over the hybrid excitation motor is realized, the control system algorithm is simplified, and the torque response speed of the motor is increased. Compared with the conventional direct torque control method, the method has the advantages that in different running regions, the set value of the stator magnetic chain is calculated according to the maximum torque current ratio algorithm, the reactive component of armature current is reduced, and the efficiency of the motor and the torque output capacity are improved.

The invention provides a test method and a test system of openflow switch table body capacity. The test method includes: obtaining matching domains supported by a target logic flow table needed to be tested and arranging default matching action of the logic flow table; adding logic flow table items of corresponding matching domains into the target logic flow table, wherein the priority level of the flow table items is sequentially and progressively increased from 1; transmitting messages of the matching domains and monitoring openflow protocol messages; and when monitoring that the protocol messages are processed according to the default matching action, recording the priority level P1 of the flow table items and lastly added into the target logic flow table, wherein the table body capacity C of the logic flow table to be tested meets that C=P1 at the time. The test method and the test system can automatically achieve testing of the switch table body capacity and meet estimation requirements of various large manufacturers for switch system performance, the testing process needs no manual intervention, the testing speed is fast, and the testing result is accurate.

The present invention relates to a direct torque control method for inhibiting torque ripples, mainly comprising the following steps: establishing an MC voltage vector switching table visually displaying degrees of change in torque and flux, and, proposing, on the basis of the MC voltage vector switching table visually displaying the degrees of change in torque and flux, an MC-DTC mark-to-space ratio computing policy for torque quantification control. The MC-DTC mark-to-space ratio computing policy allows for inhibition of torque ripples of a PMSM speed control system and for a constant switching frequency, uses the MC voltage vector switching table visually displaying the degrees of change in torque and flux, has a simple algorithm, does not reply on motor parameters, and obviates the need for rotational coordinate transformation.

A system for spectral reading includes a plurality of LEDs, an interface, and a processor. The plurality of LEDs are disposed in a physical array. Light from the plurality of LEDs is enabled to be collimated at a Fabry-Perot etalon. The interface is configured to receive a gap calibration table and power characteristics of a plurality of LEDs. The processor is configured to determine an LED switch table. The LED switch table indicates a set of the plurality of LEDs with power above a threshold at a plurality of wavelengths. The processor is further configured to cause measurement of a sample using the gap calibration table and the LED switch table for a set of gap values and determine measurement results.

The invention discloses a method and for realizing quick rerouting. The method comprises the following steps: configuring a tunnel default service and other services, which use the same main / standby switching table; and detecting whether the state of the main route is normal; and when confirming that the main route breaks down, setting the main / standby switching table, and switching the tunnel default service and the other services to a selected standby route. The invention can ensure that all the services borne by the tunnel can be quickly switched within the performance requirement range, and greatly reduces the load on the control plane of the tunnel.

The invention discloses a direct torque control strategy of a five-bridge-arm inverter driving type dual-three-phase motor system. During the normal six-bridge-arm inverter driving dual-three-phase motor direct torque control operation, a voltage vector needs to be corrected and harmonic currents can be suppressed when direct torque controlling is carried out by using a corrected virtual vector; and when a five-bridge-arm inverter driving type dual-three-phase motor fault-tolerant system is used for direct torque control after one phase of bridge arm of the six-bridge-arm inverter has a fault,the voltage vector needs to be corrected again. When the traditional dual-three-phase motor is in phase-deficient operation, the direct torque control needs to carry out stator flux linkage area division and switch table designing again; however, with the disclosed direct torque control strategy, the stator flux linkage area division and switch table selection rule is consistent with one in normal operation of the dual-three-phase motor; and the only difference is that amplitudes of six virtual vectors are reduced when five bridge arms works. The direct torque control strategy is easy to realize.