摘要:
A multiport switching device includes a configuration table that stores associations between addresses of subnets directly connected to the switching device and the port number of the multiport switching device that leads to the subnet. A host processor connected to the multiport switching device updates and maintains the configuration table. A remote processor communicates with the switching device through the host processor. To facilitate the communication of the remote processor with the multiport switch, the host processor executes a TCP/IP stack and the multiport switch is assigned a unique IP address.
摘要:
A centralized policy server sends policy messages, that describe network management policy, to network switches. Each policy message includes a packet attribute that enables a network switch to uniquely identify a received data packet, and either a priority level or network switch action that describes the switching operation to be performed by the network switch. The network switches are configured for implementing the network management policy by storing switching actions for prescribed data packets, and templates that specify frame data parameters for identifying the prescribed data packets. Each network switch, configured for performing layer 2 and layer 3 switching in an Ethernet (IEEE 802.3) network without blocking of incoming data packets, includes in each network switch port a packet classifier module configured for classifying a received data packet based on a template generated based on the policy messages. In particular, the network switch stores a plurality of user-programmable templates, each configured for identifying a corresponding class of data packet.
摘要:
A network switch includes network switch ports, each including a port filter configured for detecting user-selected attributes from a received layer 2 type data frame. Each port filter, upon detecting a user-selected attribute in a received layer 2 type data frame, sends a signal to a switching module indicating the determined presence of the user-selected attribute, enabling the switching module to generate a switching decision based on the corresponding user-selected attribute and based on a corresponding user-defined switching policy. The switching policy may specify a priority class, or a guaranteed quality of service (e.g., a guaranteed bandwidth), ensuring that the received layer 2 type data frame receives the appropriate switching support. The user-selected attributes for the port filter and the user-defined switching policy for the switching module are programmed by a host processor. Hence, the integrated network switch is able to perform advanced switching operations for layer 2 type data packets to ensure quality of service requirements, independent of priority information specified in the layer 2 type data packets, based on the user-selected attributes in the layer 2 type data packets and the user-defined switching policies established for the switching module.
摘要:
A network switch, configured for performing layer 2 and layer 3 switching in an Ethernet (IEEE 802.3) network without blocking of incoming data packets, includes network switch ports, each including a policy filter configured for obtaining layer 3 and layer 4 information from a received layer 2 frame. The layer 3 information and the layer 4 information is used to determine a policy identifier that specifies a layer 3 switching operation to be performed on the received layer 2 frame. Each network switch port also includes a flow identification module that caches portions of the layer 3 information and the corresponding policy identifier. The cached portions of the layer 3 information and the corresponding policy identifier are then used by the flow identification module to identify the appropriate policy for subsequent fragmented layer 3 frames that lack the layer 4 information necessary for performing another policy lookup, but that have sufficient layer 3 information to uniquely identify each layer three flow. Hence, each layer 3 fragment can be assigned a unique policy for execution of layer 3 switching decisions.
摘要:
A communication processor comprises a data link layer parser circuit (310) and a plurality of network layer parser circuits (322, 326). The data link layer parser circuit (310) receives a data link layer frame, and removes a data link layer header therefrom to provide a network layer frame as an output. Each network layer parser circuit corresponds to a different network layer protocol, and is selectively activated to receive the network layer frame and to process a network layer header therefrom to provide a transport layer frame as an output. The data link layer parser circuit (310) further examines a portion of the network layer frame to determine which of the plurality of network protocols is used. The data link layer parser circuit (310) activates a corresponding one of the plurality of network layer parser circuits (322, 326) in response, while keeping another one of the plurality of network layer parser circuits (322, 326) inactive.
摘要:
A system and method are provided for performing the retransmission of data in a network. Included is an offload engine in communication with system memory and a network. The offload engine serves for managing the retransmission of data transmitted in the network.
摘要:
A scheduler provided according to an aspect of the present invention provides higher priority for data units in a low priority queue upon occurrence of a starvation condition, and to packets in a high priority queue otherwise. The scheduler permits retransmission of a data unit in the lower priority queue when in the starvation condition, but clears the starvation condition when the data unit is retransmitted a pre-specified number of times. As a result, the data units in the higher priority queue would continue to be processed, thereby avoiding a deadlock at least in certain situations.
摘要:
An Internet small computer system interface (iSCSI) system, method and associated data structure are provided for receiving data in protocol data units. After a protocol data unit is received, a data list is identified that describes how the data contained in the protocol data unit is to be stored (i.e. placed, saved, etc.) in memory (i.e. application memory). Further stored is a state of the data list. To this end, the state of the data list is used in conjunction with the storage of data from a subsequent protocol data unit.
摘要:
A system and method are provided for processing packets received via a network. In use, data packets and control packets are received via a network. Further, the data packets are processed in parallel with the control packets.
摘要:
A network switch, configured for performing layer 2 and layer 3 switching in an Ethernet (IEEE 802.3) network without blocking of incoming data packets, includes network switch ports, each including a port filter configured for obtaining and filtering relevant layer 2 and layer 3 information from a received layer 2 frame. Each port filter, upon filtering the relevant layer 2 and layer 3 information from a received layer 2 frame, outputs the relevant layer 2 and layer 3 information to switching logic, enabling the switching logic to perform layer 3 processing to determine a layer 3 switching operation to be performed on the received layer 2 frame. Hence, the switching logic performs the layer 3 processing based on the relevant layer 2 and layer 3 information, without the necessity of parsing the received layer 2 and layer 3 information by the switching logic.