Juniper Networks, Inc.

Dennis C Ferguson

Pradeep S Sindhu

Hann-Hwan Ju

Raymond Marcelino Manese Lim

Gerald Cheung

Rasoul Mirzazadeh Oskouy

Sreeram Veeragandham

Rajiv N Patel

Bjorn O Liencres

Nalini Agarwal

David M Katz

Chi-Chung Kenny Chen

Pankaj Patel

Devereaux C Chen

Philippe Lacroute

Scott Mackie

Thomas Michael Skibo

Jeff Zimmer

Tatao Chuang

Michael M Y Hui

Kireeti Kompella

Ross W Callon

Stefan Alexander Dyckerhoff

James Washburn

Jeffrey Glenn Libby

Raymond Lim

Ramalingam Krishnamurthi Anand

Chang-Hong Wu

Hsien-Chung Woo

Ramesh Padmanabhan

David James Ofelt

Ashok Krishnamurthi

Kaushik Ghosh

Der-Hwa Gan

Jeffrey R Zimmer

John W Stewart, Iii

Lawrence Hui

Atsushi Kasuya

Eric M Verwillow

Avanindra Godbole

Debashis Basu

Spencer H Greene

Rami Rahim

Manoj Leelanivas

Viswesh Ananthakrishnan

Steven Wilson Turner

Michael Hui

Stephen Wilson Turner

Nischal Sheth

Michael Beesley

Ken Kuwabara

Viswesh Anathakrishnan

Junying James Yu

Hasan F Ugurdag

Visweh Ananthakrishnan

Timothy D Kolar

In general, techniques are described for organizing execution of distributed operating systems for network devices. A device comprising hardware computing nodes may be configured to perform the techniques. The hardware computing nodes may execute a protocol by which to discover a topology of the plurality of hardware computing nodes, and determine, based on the topology, a subset of the plurality of hardware computing nodes to manage execution of a distributed operating system. The determined subset of the plurality of hardware computing nodes may execute a communication bus by which to synchronize operating system state information between the subset of the plurality of hardware computing nodes. The hardware computing nodes may further execute, based on the operating system state information, the distributed operating system to provide an execution environment in which one or more applications execute.

Organizing execution of distributed operating systems for network devices

In general, techniques are described for maintaining coherency in distributed operating systems for network devices. A network device comprising hardware computing nodes may be configured to perform the techniques. The hardware computing nodes may execute a distributed operating system. At least one the hardware computing nodes may determine whether one or more of the plurality of hardware computing nodes has failed and is no longer supporting execution of the distributed operating system, and determine whether remaining ones of the plurality of hardware computing nodes exceeds a quorum threshold. The at least one of the hardware computing nodes may further restart, when the remaining ones of the plurality of hardware computing nodes is less than the quorum threshold, the distributed operating system.

Maintaining coherency in distributed operating systems for network devices

In general, techniques are described for communicating state information in distribute operating system. A network device comprises a first hardware node and a second hardware node. The first hardware node may execute a first instance of a distributed operating system, and maintain a first data structure that stores a plurality of objects defining a portion of state information. The second hardware node may execute a second instance of the distributed operating system, and maintain a second data structure that stores synchronized versions of the plurality of objects. The first hardware node may further receive updated state information, update the first data structure to include the updated state information, and synchronize the updated first data structure with the second data structure. The second hardware node may synchronize the second data structure with the updated first data structure.

Communicating state information in distributed operating systems

A method and apparatus for in-line processing a data packet while routing the packet through a router in a system transmitting data packets between a source and a destination over a network including the router. The method includes receiving the data packet and pre-processing layer header data for the data packet as the data packet is received and prior to transferring any portion of the data packet to packet memory. The data packet is thereafter stored in the packet memory. A routing through the router is determined including a next hop index describing the next connection in the network. The data packet is retrieved from the packet memory and a new layer header for the data packet is constructed from the next hop index while the data packet is being retrieved from memory. The new layer header is coupled to the data packet prior to transfer from the router.

In-line packet processing

Methods and devices for processing packets are provided. The processing device may include an input interface for receiving data units containing header information of respective packets; a first module configurable to perform packet filtering based on the received data units; a second module configurable to perform traffic analysis based on the received data units; a third module configurable to perform load balancing based on the received data units; and a fourth module configurable to perform route lookups based on the received data units.

Filtering and route lookup in a switching device

A method and apparatus for performing a lookup in a switching device of a packet switched network where the lookup includes a plurality of distinct operations each of which returns a result that includes a pointer to a next operation in a sequence of operations for the lookup. The method includes determining a first lookup operation to be executed, executing the first lookup operation including returning a result and determining if the result includes a pointer to another lookup operation in the sequence of operations. If the result includes a pointer to another lookup operation, the lookup operation indicated by the result is executed. Else, the lookup is terminated.

Processing packets by a network device

A method and apparatus for switching a data packet between a source and destination in a network. The data packet includes a header portion and a data portion. The header portion includes routing information for the data packet. The method includes defining a data path in the router comprising a path through the router along which the data portion of the data packet travels and defining a control path comprising a path through the router along which routing information from the header portion travels. The method includes separating the data path and control path in the router such that the routing information can be separated from the data portion allowing for the separate processing of each in the router. The data portion can be stored in a global memory while routing decisions are made on the routing information in the control path.

Separation of data and control in a switching device

The invention is directed to techniques for supporting multi-link protocols within a computer network. In one embodiment, a method includes receiving a set of data blocks from a plurality of links in one or more interface cards according to a multi-link protocol and sending the data blocks to a multi-link service card for sequencing. The data blocks may then be sent to the one or more interface cards for communication to a destination device over a computer network. Implementing a multi-link service card may allow a network device, such as a router, to support multi-link protocols.

Multi-link routing

Methods and devices for processing packets are provided. The processing device may Include an input interface for receiving data units containing header information of respective packets; a first module configurable to perform packet filtering based on the received data units; a second module configurable to perform traffic analysis based on the received data units; a third module configurable to perform load balancing based on the received data units; and a fourth module configurable to perform route lookups based on the received data units.

A network device includes multiple packet processing engines implemented in parallel with one another. A spraying component distributes incoming packets to the packet processing engines using a spraying technique that load balances the packet processing engines. In particular, the spraying component distributes the incoming packets based on queue lengths associated with the packet processing engines and based on a random component. In one implementation, the random component is a random selection from all the candidate processing engines. In another implementation, the random component is a weighted random selection in which the weights are inversely proportional to the queue lengths.

Packet spraying for load balancing across multiple packet processors

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Palo Alto, CA, United States of America

Dennis C Ferguson