113 results about "Packet-switching node" patented technology

A packet switching node having a pipelined packet processing architecture processing packets received via an input port associated with the packet switching node is presented. The method performed by the apparatus includes: determining a packet frame type of the packet received; selectively extracting packet header field values specific to a packet frame type, the extracted packet header field value including packet addressing information; ascribing to the packet a preliminary action to be performed in respect of the packet; searching packet switching information tracked by the packet switching node based on extracted packet addressing information; formulating a preliminary switch response for the packet; classifying the packet into one of a plurality of packet flows; modifying the preliminary switch response in accordance with one of the preliminary action, the packet flow into which the packet was classified, and a default port action corresponding to the input port; modifying the packet header in accordance with one of the preliminary action, the packet flow, and the default port action; and processing the packet in accordance with the switch response. Advantages are derived from: pipelined processing of packets which enables short-cutting the rest of the processing for improper packets; a flexible frame type determination which is fast for well know frame types yet flexible in support of new frame types delaying obsolescence of a particular implementation; an early determination of a processing action which is successively refined by subsequent stages; a combined Layer-2 and Layer-3 network addressing search engine operating on short bit length indexed Layer-2 and Layer-3 network addresses reducing network address table storage requirements, requiring a reduced data transfer bandwidth for network address table access, a large external hashed primary network address table, and a small internal secondary network address table; an early determination of a switch response; and packet-classification-based switch response and packet header modification.

The invention herein described consists of an algorithm, which performs an end-to-end estimation of the bandwidth available in an end-to-end connection established between a server and a client via a packet switching network such as the Internet Protocol Network (IP). This algorithm is used to properly regulate the input rate at the send side. Typical applications are delivering best effort traffic over TCP, or audio and video traffic over RTP/UDP. The invention is particularly effective over wireless Internet and can be used in a content delivery system to dynamically choose the best server between a set of servers to satisfy the request of a client, or to select the best route in a content deliver or global hosting system.

Routing of packets to a mobile node in a packet switching network is controlled. Routing the packets comprises generating first routing protocol data for a network address used by a mobile node of the network, the first routing protocol data specifying a characteristic of a first route passing through a first access node of the network, the first access node serving the mobile node via a communications link, and in response to the mobile node receiving service from a second access node, generating second routing protocol data for the network address, by a routing defining process involving transmitting directed routing update messages to a limited number of the packet switching nodes. The second routing protocol data specifies a characteristic of a second route passing through the second access node such that the first and second routing protocol data are held in different sets of packet switching nodes.

Packets in a packet switching network are routed along a routing path defined by data held in packet switching nodes. One or more network addresses are assigned to a first access node as home addresses. A first home address is allocated to a first mobile node with at least one routing path being directed to a first access node for that first home address. Routing in the packet switched infrastructure is altered when the first mobile node receives service from a second access node by transmitting routing update messages to a limited subset of localized packet switching nodes such that at least one routing path in the infrastructure is directed to the second access node for the first home address. Routing in the infrastructure is subsequently altered such that at least one routing path is directed to the first access node for the first home address, and the first home address is allocated to a second mobile node served by the first access node.

The invention provides a general flow table and method for supporting packet switching and circuit switching in an SDN framework, and relates to the SDN framework in the information technology. The general flow table comprises a switching type domain, a circuit switching domain and a packet switching domain. The switching type domain comprises four marks of pure circuit switching, pure packet switching, circuit-packet switching and packet-circuit switching. Service flow is forwarded to a network controller of a control layer through a southbound interface. The network controller is used for judging the type and characteristics of the service flow, computing a forwarding path of the service flow and generating the corresponding general flow table. The network controller issues the general flow table to data forwarding equipment of a data layer through the southbound interface, and establishes corresponding forwarding rules in the data forwarding equipment. The service flow completes packet switching and circuit switching in the data forwarding equipment according to the forwarding rules. The general flow table and method can simultaneously support the packet switching technology and the circuit switching technology, and two existing basis independent networks can be replaced by a data and transmission convergent network efficient in operation.

A selective packet discard mechanism is disclosed for selectively discarding packets at buffers in packet switches in the event of traffic congestion. The mechanism makes use of ordering information contained in data packets, such as forward sequence numbers or timestamps, to estimate the packet loss that traffic flows may have already incurred at upstream packet-switching nodes. This estimated upstream packet loss information is used to make improved packet discard decisions. The mechanism may be applied independently to a plurality of buffers at a plurality of packet switches to form a distributed data traffic management system.

Upon initialization, a VPC is set up between edge nodes. A control processor of each node creates an IP address/VPC mapping table using IP routing information and an address mapping table mapping correspondence between IP addresses and ATM addresses and supplied by a network management system. A gateway assigns a VCC to each packet input to the network. A sending-side edge node inputs the packet to the VPC corresponding to its destination by referring to the IP address/VPC mapping table. A transit node performs packet switching over VP. A receiving-side edge node transfers each packet to the gateway corresponding to its destination. If a series of packets meet a predetermined condition in a given edge node, its control processor sends VCC information to input interfaces of the edge node so that the packets are switched by an ATM switch in the edge node without intervention of the control processor.

A communication system capable of avoiding congestion in transmission of moving image data, includes (1) at least one receiving terminal, (2) a moving image delivery device for delivering moving image data to the at least one receiving terminal, (3) a moving image conversion device which has at least one moving image conversion unit for converting, in accordance with conversion parameters, the moving image data sent from the moving image delivery device, a conversion parameter setting unit for determining the conversion parameters, and a monitored result receiving unit, and (4) at least one packet switching node which has at least one data storage unit for preliminarily storing the moving image data from the moving image conversion device to be sent to the at least one receiving terminal, a data amount monitor unit for monitoring an amount of the moving image data stored in the at least one data storage unit to judge that the monitored data amount reaches a first threshold, and a monitored result sending unit for sending a congestion preview information to the moving image conversion device when the data amount monitor unit judges that the monitored data amount reaches the first threshold. The monitored result receiving unit receives the congestion preview information from the monitored result sending unit, and the conversion parameter setting unit determines the conversion parameters so that the moving image conversion unit converts the moving image data sent from the moving image delivery device into a moving image data with a smaller coding bit rate.

The present invention provides a method and device for protective switching of pseudo-wires on a Packet Switching Network. The method includes grouping the pseudo-wires on the Packet Switching Network into a working pseudo-wire group and a protective pseudo-Wire group corresponding to each other's relationship of protection; performing on services the protective switching between the working pseudo-wire group and the protective pseudo-wire group according to the state of the working pseudo-wire group and protective pseudo-wire group. The method of the present invention can be used to perform edge-to-edge grouped protective switching of the pseudo-wires on the Packet Switching Network.

A method and apparatus for generating a degree-constrained minimum spanning tree (MST) may include a plurality of point-to-point (P2P) packet switching nodes for receiving and sending data packets; a plurality of point-to-multi-point (P2MP) packet switching nodes for sending and receiving the data packets; and a plurality of transmission links coupling pairs of the plurality of packet switching nodes, where each of the plurality of transmission links has a distance. A path computation module may determine a degree-constrained MST such that each of the plurality of P2P packet switching nodes has a degree of two. An extended Bellman-Ford algorithm successively analyzes each of the plurality of packet switching nodes as a present node and calculates the degree-constrained MST as a function of the distance of each of the plurality of transmission links and whether a previous node from the present node is a P2P packet switching node or a P2MP packet switching node.

The present invention relates to a packet switched communications network especially to an Ethernet network in which User Network Interfaces (UNI) are standardized between client network (202) and core network (203) with a number of UNI service attributes. In one aspect of the invention a method is used in current packet switched nodes implementing a policer function. The task of the function is to decide whether packets with high drop preference need to be dropped or not due to resource shortage on the given interface. All outgoing packets at a given port will undergo this policer (401) irrespective of the source, destination, identification codes or traffic class. Policer (401) drops packets with high drop preference in one traffic class before a packet of low drop preference is dropped in any other traffic class, and drops packets with high drop preference before a packet of low drop preference is dropped in the same queue. In the course of dropping packets, policer (401) prevents the reordering of packets with low drop preference and packets with high drop preference within the same flow.

The invention discloses a method for TDM business of packet switching network transmission, comprising the following steps: A. analyzing TDM data frame and extracting the payload and TDM assembling information; B. sealing the payload and the TDM assembling information in the packet switching data packet and sending the information to the packet switching network to be transmitted. The invention also discloses a device and a system which are used for realizing TDM business of packet switching network transmission. The invention can combine the TDM network and the packet switching network together so as to transmit the TDM business through the packet switching network.

A two-chip/single-die switch architecture and a method for accessing a DDR SDRAM memory store in a switching environment are presented. The two-chip/single-die architecture includes an internal memory storage block on the single-die, an external memory storage interface to a Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), an external memory manager, and a packet data transfer engine effecting packet data transfers between an internal memory store and the external DDR SDRAM memory. The packet data transfer engine operates as an adaptation layer addressing issues related to employing appropriate: addressing schemes, granule sizes, memory transfer burst sizes, access timing, etc. The packet data transfer engine includes a minimal number of dual mode operational blocks such as: a queue manager, and adaptation receive and transmit blocks. The method relates to a packet data transfer discipline addressing random memory access latencies incurred in employing DDR SDRAM, using predictive bank switching to hide random access latencies, packet length dependent variable memory write burst lengths to minimize bank switching, and performing memory read and write operations during corresponding read and write windows. Advantages are derived from the a space-efficient two-chip/single-die switching node architecture implemented with a reduced amount of dual mode logic, and also from DDR SDRAM bandwidth utilization efficiencies.

Communicating voice over a packet-switching network is implemented on a telecommunications network that includes the packet-switching network, two coding units coupled to the packet-switching network and two signaling apparatuses. Signaling data for establishing the voice call is received by an originating signaling apparatus, which generates a message that encapsulates the signaling data in accordance with a common signaling protocol, and transmits the message to a destination signaling apparatus. The message, in accordance with the common signaling protocol, includes a call identifier that uniquely identifies the voice within the packet-switching network, the network address of a signaling apparatus, and/or a connection descriptor for a coding unit.

In a network management system performing a fault management process in a hierarchical network, an upper layer fault manager performs a fault management of an upper layer of a hierarchical network, a lower layer fault manager performs a fault management of a lower layer of the network, an inter-layer node connecting information storage portion manages connecting information between packet switching nodes composing the upper layer and link offering nodes composing the lower layer, and an inter-layer fault notifying portion notifies the upper layer fault manager, upon receiving a notification of a link fault which has occurred on a link between the link offering nodes from the lower layer fault manager, that the packet switching nodes affected by the fault are faulted, based on the connecting information.