Abstract: A system may include a module that includes a component, a logic device to provide an instruction on behalf of the component, and control logic to generate a desired output voltage signal in response to a constant current, where the desired output voltage signal indicates a determined voltage that the component is configured to operate with when performing an operation. The system may include a board that includes a power supply to produce the determined voltage based on the instruction, and an interface to couple the determined voltage to the component to allow the component to perform the operation on behalf of the board, send the constant current to the control logic, and receive the desired output voltage signal from the control logic.

Abstract: A system detects an error in a network device that receives data via a group of data streams. The system receives a data unit, where the data unit is associated with at least one of the streams and a sequence number for each of the associated streams. The system determines whether each sequence number associated with the data unit is a next sequence number for the corresponding stream, and detects an error for a particular stream when the sequence number for that stream is not a next sequence number.

Abstract: In general, the invention is directed to techniques of load balancing network traffic among paths on a point-to-multipoint overlay network. In load balancing the network traffic, the techniques take into consideration costs associated with paths through the overlay network and costs associated with paths beyond the egress points of the overlay network, even when such costs may be unequal.

Abstract: A packet header processing engine includes a memory having a number of distinct portions for respectively storing different types of descriptor information for a header of a packet. A packet header processing unit includes a number of pointers corresponding to the number of distinct memory portions. The packet header processing unit is configured to retrieve the different types of descriptor information from the number of distinct memory portions and to generate header information from the different types of descriptor information.

Abstract: A communication system for use with a packet-based network is disclosed. A first node is configured to transmit circuit data in data packets across the network. A second node is configured to receive the data packets from the network and serialize the synchronous data. The second node comprises a configurable buffer, the buffer being configurable to adjust to network packet delay variance through analysis of packet delay variance as measured over at least one period of time.

Abstract: Techniques are described for providing routing scalability within a protocol such as a label distribution protocol. A method comprises receiving a label mapping message at an ingress router for establishing a label switched path (LSP) that identifies within a first portion a first label to be used for forwarding network traffic to an intermediate router of the LSP, and identifies within a separate portion a second label to be used for forwarding network traffic to an egress router of the LSP. The method further comprises parsing the first and separate portions, installing first forwarding state at the ingress router identifying the first label for forwarding network traffic to the intermediate router, and installing second forwarding state at the ingress router identifying a two-label stack comprising the first label as an outer label and the second label as an inner label for forwarding network traffic to the egress router.

Abstract: A method performed by a network device may include assembling a multiprotocol label switching (MPLS) echo request, the echo request including an instruction for a transit node to forward the echo request via a bypass path associated with the transit node, and an instruction for an egress node to send an echo reply indicating that the echo request was received on the bypass path. The method may also include sending the MPLS echo request over a functioning label switched path (LSP).

Abstract: A system determines bandwidth use by queues in a network device. To do this, the system determines an instantaneous amount of bandwidth used by each of the queues and an average amount of bandwidth used by each of the queues. The system then identifies bandwidth use by each of the queues based on the instantaneous bandwidth used and the average bandwidth used by each of the queues.

Abstract: A network device may include logic configured to receive a problem report from a second network device, where the problem report includes event data, determine at least one of an action to perform or whether reconfiguration information is associated with the event data in the received problem report and add information to the received problem report to provide a reformatted problem report and transmit the reformatted problem report to a third network device when it is determined that reconfiguration information is not associated with the event data in the problem report.

Abstract: A device may include a processor to execute a thread. The processor may be further configured to execute a set of wrappers that are called from within the thread to invoke a set of one-shot signal objects to generate delayed signals. Each of the set of wrappers may be configured to detect whether different ones of one-shot signal objects that were invoked from within the thread have generated signals at periodic time intervals, determine a delay to be used for invoking one of the set of one-shot signal objects, and invoke the one of the set of one-shot signal object to generate one of the delayed signals based on the delay when the different ones of one-shot signal objects have generated signals at periodic time intervals. The processor may be further configured to receive the delayed signals generated from the set of one-shot signal objects over a time period.

Abstract: Principles of the invention are described for providing multicast virtual private networks (MVPNs) across a public network that are capable of carrying high-bandwidth multicast traffic with increased scalability. In particular, the MVPNs may transport layer three (L3) multicast traffic, such as Internet Protocol (IP) packets, between remote sites via the public network. The principles described herein may reduce the overhead of protocol independent multicast (PIM) neighbor adjacencies and customer control information maintained for MVPNs. The principles may also reduce the state and the overhead of maintaining the state in the network by removing the need to maintain at least one dedicated multicast tree per each MVPN.

Abstract: A method and an apparatus for rapidly resuming, at times of failures, network traffic in a connection-oriented network by using an alternative route pre-computed and stored locally in nodes along an initial route without requiring signaling of upstream nodes or a master server.

Abstract: Requests from a client to a network device are authenticated based on a session ID obtained by the network device. Requests may be authenticated by obtaining a session ID value when a session is initiated and transmitting a document to the client that embeds the session ID in such a manner that additional requests to the network device based on the document include the session ID in the request. The additional requests are authenticated based on a determination of whether the session ID is included in the additional requests.

Abstract: There is provided a line redundant method for implementation of line switching in a switching matrix, including the bridge step of outputting a data signal to a plurality of redundant lines in the switching matrix, and the selector step of selecting only a data signal, of a plurality of data signals input from another switching matrix other than the switching matrix through the plurality of redundant lines, which is input through a redundant line required in the switching matrix, and not selecting the data signals input to the switching matrix through the lines other than the required redundant line. A line redundant system for implementing this method is also provided.

Abstract: A band control system for a digital subscriber line network in which a first apparatus and a second apparatus situated at a subscriber station and a center, respectively, are interconnected by a cable for interchanging at least a digital data signal with each other. The system may cause one of the first apparatus or the second apparatus to monitor receipt of signals from the other of the first apparatus or the second apparatus; send, based on a result of monitoring, a band variation command to the other apparatus for causing the other apparatus to vary a band by using a frequency band not used for signal transfer; cause the other apparatus to receive the band variation command; and vary the band in accordance with the band variation command.

Abstract: A linked list traversal system identifies when a linked list has become inefficient, either through attack or an undue multiplicity of collisions. A data unit is parsed to extract a key. A first hash result associated with the key is calculated based on a first hash function. A first linked list is identified based on the first hash result. It is determined whether the first linked list has been compromised. A second hash result associated with the key is calculated based on a second hash function when the first linked list has been compromised. A second linked list is established based on the second hash result, where the second hash result is different from the first hash result.

Abstract: A network device is described in which a dedicated resource scheduler monitors memory consumption to provide for improved processing of communication sessions. The scheduler maintains a dependency list of communication sessions, and reserves memory for communication sessions as requests for memory are received. The amount of memory reserved is determined based on the amount of memory currently reserved for the communication sessions in the dependency list. The network device may control ongoing communication sessions by way of window manipulation. Communication sessions are processed in a first mode when available memory has not reached a predetermined amount, while communication sessions are processed in a second mode when available memory reaches a predetermined amount.

Abstract: In general, techniques are described for summarizing label mappings and thereby enabling longest-prefix match within Multi-Protocol Label Switching (MPLS) networks. More specifically, a first router included within a first area of a network comprises a control unit that maintains a label space defining labels available for mapping to a plurality of addresses assigned to network devices within the network. The control unit reserves a contiguous set of the labels of the label space and maps the contiguous set of labels to first area addresses. The first area addresses include those addresses of the plurality of addresses available for assignment to network devices within the first area. The first router also includes an interface card that transmits, to a second router of a second area of the network, an advertisement that advertises a summarized version of the mapping between the contiguous set of labels and the first area addresses.

Abstract: A network device is described that concurrently executing more than one instance of an operating system on a single processor. Each of the instances of the operating system executes completely independent of the other instances. In this way, disparate instances may exist for the same operating system or for different operating systems. The techniques allow the processor to concurrently execute, for example, an instance of the operating system may emulate a routing engine and an instance of the operating system may emulate an interface controller. A hyper scheduler performs context switches between the operating systems to enable the processor to concurrently execute the instances of the operating system. The techniques may provide a low cost alternative to employing multiple processors within a network device, such as a router, to execute multiple independent operating systems.

Abstract: A system manages a buffer having a group of entries. The system receives information relating to a read request for a memory. The system determines whether an entry in the buffer contains valid information. If the entry is determined to contain valid information, the system transmits the information in the entry in an error message. The system may then store the received information in the entry. In another implementation, the system stores data in one of the entries of the buffer, removes an address corresponding to the one entry from an address list, and starts a timer associated with the one entry. The system also determines whether the timer has exceeded a predetermined value, transferring the data from the one entry when the timer has exceeded the predetermined value, and adds the address back to the address list.