Abstract:
A method and system is disclosed for performing a pattern match search for a data string having a plurality of characters separated by delimiters. A search key is constructed by generating a full match search increment comprising the binary representation of a data string element, wherein the data string element comprises all characters between a pair of delimiters. The search key is completed by concatenating a pattern search prefix to the full match search increment, wherein the pattern search prefix is a cumulative pattern search result of each previous full match search increment. A full match search is then performed within a lookup table utilizing the search key. In response to finding a matching pattern within the lookup table, the process returns to constructing a next search key. In response to not finding a matching pattern, the previous full match search result is utilized to process the data string.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and its method by which a bandwidth of a consecutive bit rate virtual path connection set up between a source node and a destination node is dynamically adjusted in a packet or cell exchange network comprising a transmission link and a plurality of interconnected nodes. SOLUTION: The network defines a bandwidth management server that accesses information relating to a network node and a transmission link. This server receives indication relating to an initial bandwidth reserved for connection every time virtual path connection or virtual channel connection is set up on the network. The server detects and uses in common the bandwidth available on the transmission link between consecutive bit rate virtual path connections whose bandwidth is adjustable in the consecutive or periodic mode and decides new bandwidth to each connection. A source node is informed of it every time new bandwidth is calculated and adjusts the bandwidth of the consecutive bit rate virtual path connection whose bandwidth is adjustable accordingly.
Abstract:
PROBLEM TO BE SOLVED: To provide methods and an apparatus for improving security while transmitting a data packet. SOLUTION: In a first aspect of the present invention, a first method of transmitting a data packet is provided. The first method includes the steps of: (1) for each connection from which a data packet may be transmitted, storing header data corresponding to the connection; (2) employing a user application to form a header and payload data of a packet, wherein the user application is associated with a connection from which the packet is to be transmitted; and (3) while transmitting the packet, comparing one or more portions of the packet header data with the header data corresponding to the connection with which the user application is associated. Numerous other aspects are also provided. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
Multicast transmission on network processors is disclosed in order both to minimize multicast transmission memory requirements and to account for port performance discrepancies. Frame data for multicast transmission on a network processor is read into buffers to which are associated various control structures and a reference frame. The reference frame and the associated control structures permit multicast targets to be serviced without creating multiple copies of the frame. Furthermore this same reference frame and control structures allow buffers allocated for each multicast target to be returned to the free buffer queue without waiting until all multicast transmissions are complete.
Abstract:
A system and method for controlling overall behavior of a network processor device implemented in a network processing environment servicing a communications network. The method includes steps of receiving a guided control frame including one or more control functions for configuring various functional devices within the network processor with device control parameter data; a step of forwarding one or more control functions from a received control frame to a functional device within the network processor to be configured; and, executing the control functions as specified in the control frame. A novel control frame data structure and communications infrastructure is implemented whereby any network processor device operating in a distributed network processing environment may be controlled in accordance with executed control functions and device control parameter data.
Abstract:
In a distributed networking environment employing several general purpose processors (i.e., control point processors) for controlling one or more network processor devices, a mechanism for distributing processing across several general purpose processors and interface for configuring a network processor so that specific general purpose processors handle specific operations in a large networking environment, thus, reducing requirement for provisioning a plurality of protocol stacks on each general purpose processor.
Abstract:
PROBLEM TO BE SOLVED: To provide a method, an apparatus, and a computer program for adding a QOS level to a packet.SOLUTION: Syntax analysis of a multi layer network communication including a nest header by a continuous network layer is performed, and a value related to a priority or a quality of service requirement (a priority indicator value) for data of each individual layer distributed over a header group is extracted. Aggregated data (a composition aggregation priority value) is applied to a table where different possible composition aggregation priority values corresponding to a lower resolution quality level value are mapped. The priority indicator value or the composition aggregation priority value can be filtered, or masked, or compressed. In one embodiment, bit subsets different from each other for storing the priority indicator values are selected based on a logical port associated with a packet and the final priority indicator value applied to a discriminated sub-table having a mapping of quality level values suitable for the logical port.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for implementing use of a network connection table which more shortens a required processing time and an access time, and is more easily achieved, more efficient and more inexpensive. SOLUTION: Searching for network connections includes receiving a packet, and zeroing particular fields of connection information from the packet if a new connection is to be established. The connection information is converted to an address for a location in a direct table using a table access process. The direct table stores patterns and reference information for new and existing connections. The connection information is compared with at least one pattern stored in the direct table at the address to find reference information for the received packet. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide compacted binary identifier generation.SOLUTION: Compaction of large (16-byte) IPv6 addresses into regular (4-byte) address fields is performed while preserving the properties required for a hash key, based on cumulative XOR based prehashing of 4 bytes at a time.
Abstract:
PROBLEM TO BE SOLVED: To provide a system for providing an easily expandable network processor service architecture independent of a processor and an operating system. SOLUTION: The system is provided with plural portable individual function components equivalent to the specified segment of the device driver of a control processor. The function components are provided with low standard API and external API and execute various network processor functions such as the reception and transfer of packets on a network and the other functions required by the control processor so as to perform communication with a network processor and instruct it. The function components are designed so as to be adapted to the usable processor architectures and operating systems of various types and to enable a customer and a developer to customize and expand the usable network service.