MANAGING DISTRIBUTED ADDRESS POOLS WITHIN NETWORK DEVICES
Granted: September 29, 2011
Application Number:
20110238793
In general, techniques are described for managing distributed address pools within network devices. A network device that includes a control unit and at least one interface may implement these techniques. The control unit stores data defining a network address pool shared by both the network device and another network device. The control unit includes a shared pool manager module that evaluates the data defining the network address pool to determine a block of addresses of the network…
AGER RING OPTIMIZATION
Granted: September 29, 2011
Application Number:
20110238804
A device provides an ager ring that ages entries associated with managed resource of a device, and determines whether a particular entry associated with a particular managed resource of the device is to be updated. The device also updates, when the particular entry is to be aged out in a particular time frame, the particular entry in the ager ring based on a bucket offset and a current time bucket associated with the particular entry and based on a current time, a refresh timeout, and a…
METHODS AND APPARATUS FOR AUTOMATICALLY PROVISIONING RESOURCES WITHIN A DISTRIBUTED CONTROL PLANE OF A SWITCH
Granted: September 29, 2011
Application Number:
20110238816
In some embodiments, a network management module is operatively coupled to a set of edge devices that are coupled to a set of peripheral processing devices. The network management module can receive a signal associated with a broadcast protocol from an edge device from the set of edge devices in response to that edge device being operatively coupled to a switch fabric. The network management module can provision that edge device in response to receiving the signal. The network management…
WAKE-AHEAD BASED ON PATTERNS
Granted: September 29, 2011
Application Number:
20110238907
A method may include detecting an event, determining whether the event correlates to a hard disk access, requesting a wake-ahead of a hard disk drive if it is determined that the event correlates to a hard disk access, weighing a performance improvement of the hard disk drive if the wake ahead request is granted against a life of the hard disk drive if the wake ahead request is not granted, and waking ahead the hard disk drive if the performance improvement outweighs the life of the hard…
WEIGHT-BASED BANDWIDTH ALLOCATION FOR NETWORK TRAFFIC
Granted: September 29, 2011
Application Number:
20110235653
A network device may implement packet scheduling with administrator-configurable packet scheduling policies. In one implementation, the network device includes a filter component configured to assign priority levels to data units, the priority levels defining traffic classes for the data units. The network device may also include a scheduler component configured to schedule transmission of the traffic classes based on an assignment of weights to the traffic classes using at least one…
VIRTUAL LINK AGGREGATION OF NETWORK TRAFFIC IN AN AGGREGATION SWITCH
Granted: September 22, 2011
Application Number:
20110228767
Access switches in a switching system may use virtual aggregated links. When a link between an aggregation switch and an access switch fails, the link failure may be reflected in the virtual aggregated link and data traffic to another access switch may be switched away from the failed switch. A forwarding table in the access switch stores a number of entries that each define a correspondence between destination addresses and an output identifier for the switch. At least a first output…
REORDER ENGINE WITH ERROR RECOVERY
Granted: September 22, 2011
Application Number:
20110228784
A reorder engine classifies information relating to incoming data items as belonging to either a first, second, or third region. The information relating to the data items may arrive at the reorder engine out of order. The data items each include a sequence number through which the reorder engine may reconstruct the correct order of the data items. Based on the classification, the reorder engine may either process the data items normally or drop certain ones of the data items. The…
CUSTOMIZED CLASSIFICATION OF HOST BOUND TRAFFIC
Granted: September 22, 2011
Application Number:
20110228793
A network device component receives traffic, determines whether the traffic is host bound traffic or non-host bound traffic, and classifies, based on a user-defined classification scheme, the traffic when the traffic is host bound traffic. The network device component also assigns, based on the classification, the classified host bound traffic to a queue associated with network device component for forwarding the classified host bound traffic to a host component of the network device.
MULTI-BANK QUEUING ARCHITECTURE FOR HIGHER BANDWIDTH ON-CHIP MEMORY BUFFER
Granted: September 22, 2011
Application Number:
20110228795
A network device includes a main storage memory and a queue handling component. The main storage memory includes multiple memory banks which store a plurality of packets for multiple output queues. The queue handling component controls write operations to the multiple memory banks and controls read operations from the multiple memory banks, where the read operations for at least one of the multiple output queues alternates sequentially between the each of the multiple memory banks, and…
UPGRADING SYSTEM SOFTWARE IN A CHASSIS WITHOUT TRAFFIC LOSS
Granted: September 22, 2011
Application Number:
20110231833
Rolling software upgrades may be employed for a network device in a modular chassis and/or virtual chassis. The network device may include memory devices to store a software upgrade package and a group of instructions, and a processor. The processors may install the software upgrade package on a backup routing engine; determine subsets of multiple line cards on which to perform a software upgrade, where ports in each of the multiple line cards are part of a link aggregation group (LAG);…
OPERATIONS, ADMINISTRATION, AND MANAGEMENT FIELDS FOR PACKET TRANSPORT
Granted: September 15, 2011
Application Number:
20110222412
A network includes an egress node connected to an ingress node via a network path. The egress node is configured to receive, from the ingress node, a group of packets via the network path, where each packet includes an operations, administration, and management (OAM) field appended to the packet, and where the OAM field stores OAM information. The egress node is further configured to read the OAM information from the packets; analyze the OAM information, associated with one or more of…
SYSTEMS AND METHODS FOR COMPRESSING PACKET HEADERS
Granted: September 15, 2011
Application Number:
20110222598
A system processes data units in a network. The system receives a data unit that includes a group of headers and suppresses one or more of the headers to form a reduced data unit. The system suppresses one or more other headers of the reduced data unit to form a further reduced data unit and transmits the further reduced data unit to one or more destination devices using the program identifier (PID) field in the MPEG header as an index to suppressed headers.
USING DEDICATED UPSTREAM CHANNEL(S) FOR CABLE MODEM INITIALIZATION
Granted: September 15, 2011
Application Number:
20110222558
A system facilitates initialization of devices in a cable modem network. The system may provide downstream channels for transmitting data to the devices and upstream channels for receiving data from the devices. At least one of the upstream channels may be dedicated to providing initialization opportunities. This dedicated upstream channel(s) includes less than all of the upstream channels. The system may transmit upstream channel identifiers on the downstream channels, where each of the…
CONTROLLING NETWORK TRAFFIC
Granted: September 15, 2011
Application Number:
20110222425
In an ATM exchange, a cell transmission control section transmits an ATM cell to a transmission path of an ATM network. A traffic monitor monitors traffic of the cell transmissions. A statistical process section performs a temporal statistical process on the result of the traffic monitoring using a clock and a memory. A CAC produces an instruction for traffic control over a transmission terminal based on the result of the statistical process. A UPC controls traffic of a transmission path…
COMMUNICATING NETWORK PATH AND STATUS INFORMATION IN MULTI-HOMED NETWORKS
Granted: September 15, 2011
Application Number:
20110222413
An example network system includes a layer two (L2) device and a layer three (L3) device. The L2 device includes a control unit is configured to determine a preferred network path from a first L2 network in which the L2 device resides to an intermediate L3 network in which the L3 device resides that couples the first L2 network to a second L2 network having a second L2 device. The control unit includes a management endpoint (MEP) module. The MEP module executes an operations,…
WORK-CONSERVING PACKET SCHEDULING IN NETWORK DEVICES
Granted: September 8, 2011
Application Number:
20110216773
In general, techniques are described for performing work conserving packet scheduling in network devices. For example, a network device comprising queues that store packets and a control unit may implement these techniques. The control unit stores data defining hierarchically-ordered nodes, which include leaf nodes from which one or more of the queues depend. The control unit executes first and second dequeue operations concurrently to traverse the hierarchically-ordered nodes and…
DATA TRANSFER SYSTEM AND METHOD
Granted: August 25, 2011
Application Number:
20110206048
A transmission source bridge collects packets sent from nodes connected to a serial bus in accordance the IEEE1394 Standards, into one packet in an order they are to be transmitted and then sends them onto an ATM network, so that a transmission destination bridge receives this packet and divides it into a plurality of smaller packets and transfers them, in the order they were sent, to nodes connected to the serial bus in accordance with the IEEE1394 Standards.
TARGETED FLOW SAMPLING
Granted: August 25, 2011
Application Number:
20110206049
A device may include two or more line interfaces. One of the line interfaces may include a component to buffer a packet that is received at the line interface, perform a lookup of information related to selecting a flow based on a header of the packet, apply a symmetric hash function to addresses in the header to obtain a hash when the information related to selecting the flow indicates the flow is to be selected based on a random method, compare the hash to a particular number using the…
PPP TERMINATING EQUIPMENT, NETWORK EQUIPMENT AND METHOD OF RESPONDING TO LCP ECHO REQUIREMENT
Granted: August 25, 2011
Application Number:
20110206050
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…
SYSTEMS AND METHODS FOR INCREASING CABLE MODEM SYSTEM BANDWIDTH EFFICIENCY
Granted: August 25, 2011
Application Number:
20110206103
A cable modem termination system measures signal qualities of upstream transmissions associated with one or more cable modems. The system monitors the measured upstream signal qualities, and selectively commands at least one of the one or more cable modems to switch between upstream channels based on the signal quality monitoring.
