Abstract: A method of scheduling upstream bandwidth. This method comprises: 1) anticipating the need for the upstream bandwidth in advance of any specific request for said upstream bandwidth; and 2) scheduling the upstream bandwidth in accordance with such need.

Abstract: A hierarchical traffic policer may include a first policer configured to pass first packets when a first condition is met. The first policer also may alter selection information within the passed first packets. A second policer may be configured to pass second packets when a second condition is met. The second policer may be further configured to pass all of the passed first packets from the first policer based on the altered selection information within the passed first packets.

Abstract: A system, method, and device for computer networking. According to one embodiment of the invention, the method includes receiving from a remote client a request for a web resource containing renderable and non-renderable data. The method further includes filtering at least a portion of the non-renderable data from the requested web resource, thereby creating a modified web resource. The method also includes sending the modified web resource to the remote client. Non-renderable data may include whitespace, comments, hard returns, meta tags, keywords, or other data not used by a browser to present a web page.

Abstract: A group poll mechanism (GPM) that schedules upstream bandwidth for cable modems by pointing a request opportunity normally reserved for a single service flow to more than one service flow. Essentially, instead of using the seldom-used poll requests one per service flow, this same request opportunity is pointed to multiple service flows. In such kind of a scheme the GPM gives the same mini-slot to multiple service flows. The GPM implements the use of place-holder SIDs and novel mapping of information elements in MAP messages.

Abstract: A network content service apparatus includes a set of compute elements adapted to perform a set of network services; and a switching fabric coupling compute elements in said set of compute elements. The set of network services includes firewall protection, Network Address Translation, Internet Protocol forwarding, bandwidth management, Secure Sockets Layer operations, Web caching, Web switching, and virtual private networking. Code operable on the compute elements enables the network services, and the compute elements are provided on blades which further include at least one input/output port.

Abstract: Methods and apparatus for transferring packets in a packet switched communication system. A system is provided that includes an L2 device including a controller determining for each packet received whether the received packet is to be inspected, an inspection device operable to inspect and filter packets identified by the controller including using a zone specific policy and an L2 controller for transferring inspected packets in accordance with L2 header information using L2 protocols.

Abstract: In general, the invention facilitates diagnosing fault conditions, such as flapping, by permitting users to request information for specific components in a network device such as a router. The invention also facilitates the diagnosis of other fault conditions, including, but not limited to, excessive numbers of dropped packets, hard drive crashes, high temperature readings, and inactive interface cards. A user may obtain a targeted log containing information relating to selected fault conditions or other network device events, rather than a system log containing information relating to all network device events, some of which may not be of interest to the user. The targeted log may be parsed and analyzed with greater ease than the system log.

Abstract: Techniques are described for selectively filtering data, such as network packets, that correspond to forwarding tables. For example, a router receives packets from an input interface of an interface card (IFC). The router applies one or more input interface filters associated with the input interface that received the packet. The router selectively associates the packet with a forwarding table, applies a corresponding forwarding filter, and determines the output interface corresponding to the next hop of the packet. The router may further apply one or more output interface filters associated with the output interface, and forwards the packet in accordance with the respective forwarding information.

Abstract: A communication network design circuit can derive a path and a necessary link capacity for multiple point communication service permitting arbitrary communication within a predetermined range of communication amount by providing traffic amount of data in-flowing through an ingress node and traffic amount of data flowing out through an egress node. The communication network designing circuit has setting means for setting a mathematical programming problem for deriving the multiple point communication service and optimizing means for solving the mathematical programming problem set by the setting means and obtaining the path for the multiple point communication service.

Abstract: A system for multicasting a packet of data to a single data stream is provided. The system may determine a size of the packet and may send a single copy of the packet if the size of the packet exceeds a threshold value. A number of copies of the packet yet to be multicast may be ascertained if the size of the packet of data does not exceed the threshold value. Copies of the packet may be transmitted based on the number of copies of the packet yet to be multicast.

Abstract: A network device is provided. The network device may include at least one set of buffers to buffer network traffic; a monitor to determine varying amounts of available buffer space associated with the buffers; and logic to assign reading rates to the respective buffers for scheduling output of the buffered traffic. The logic may be configured to increase an assigned reading rate associated with one of the buffers to at least one elevated reading rate based on a reduction of the available buffer space in the one buffer to a first amount and reset the at least one elevated reading rate to the assigned reading rate based on a subsequent increase in the available buffer space beyond that of the first amount.

Abstract: A node apparatus includes a header processing section (2) for determining an output destination of an incoming packet and a quality class from the header information of the packet, a route table (3), and a quality description table (4), and storing the packet in an output queue (6) determined by the determined output destination and quality class, an output control section (7) for reading out a packet from the output queue in accordance with the quality set for each output queue (6) and sending out the read packet through a VC determined by the determined output destination and quality class.

Abstract: A network device includes an interface and packet processing logic. The interface receives a multicast packet. The packet processing logic determines identifier data corresponding to the received multicast packet and replicates the identifier data to multiple outgoing packet forward engines at a first point in a processing path. The packet processing logic further replicates the identifier data to multiple data streams at a second point in the processing path and replicates the identifier data to multiple logical interfaces in the same stream at a third point in the processing path.

Abstract: A data processing system performs any-to-any transmission of data blocks. The system receives the data blocks on incoming data streams, and load balances the data blocks across a number of processing paths. The processing paths process the data blocks causing one or more of the data blocks to become out of order relative to an order in which the data blocks were received. The system hashes the data blocks to determine a manner in which to transmit the data blocks, reorders the data blocks to restore the order in which the data blocks were received, and transmits the reordered data blocks on outgoing data streams.

Abstract: In a PPP terminating equipment 100 connected with a switch fabric and terminating PPP link, the PPP terminating equipment 100 has an LCP echo requirement detecting section 20 detecting whether or not a received packet is the LCP echo requirement packet, and an LCP echo response producing section 40 producing a response packet to the LCP echo requirement by rewriting the LCP header of the received LCP echo requirement packet. The PPP terminating equipment 100 thereby produces and returns the response packet to the LCP echo requirement.

Abstract: A network device includes interface logic and processing logic. The interface logic receives data. The processing logic generates a checksum of the data and fragments the data into one or more cells. The processing logic further determines whether one of the one or more cells includes at least one of cell overhead bytes and cell pad bytes, and selectively inserts the checksum into the at least one of cell overhead bytes and pad bytes based on the determination.

Abstract: A system selectively drops data from queues. The system includes a drop table that stores drop probabilities. The system selects one of the queues to examine and generates an index into the drop table to identify one of the drop probabilities for the examined queue. The system then determines whether to drop data from the examined queue based on the identified drop probability.

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: Techniques for delivering and receiving multicast content across a unicast network are described. A system that supports delivery and reception of multicast content across a unicast network includes a first device and a second device. The first device may be a destination device or a multicast-enabled router. The second device is multicast-enabled, and may be a multicast-enabled router. The first device determines whether a route between a destination device and a source of multicast packets is multicast-enabled, sends a unicast request message that includes as a destination address an address associated with the source and is marked for interception by a second device based on the determination, and receives the multicast packets as unicast packets from the second device. The second device intercepts the unicast request message and delivers the multicast packets to the requesting device as unicast packets in response to the unicast request message.

Abstract: Techniques are described for distribution of label switched packets, such as multiprotocol label switched (MPLS) packets, across multiple physical data paths. The techniques may, for example, be used to load balance the label switched packets across an aggregated link having two or more logically associated physical interconnects. A network device, for example, includes an interface card to receive packets associated with a common label switched path (LSP), and a control unit to distribute the packets across multiple paths. The network device may include label data that maps ranges of labels, such as MPLS labels, to types of payloads carried by the label switched packets. In accordance with the label data, the control unit extracts flow information from the label switched packets and distributes the label switched packets across the paths based on the flow information.