Juniper Networks, Inc.

3com Corporation

Thomas A Lemaire

Vitali Vinokour

Michael E Lipman

Ryan Ross

Paul J Giacobbe

Shawn Gallagher

Daniel K Siu

Jerome Pascal Moisand

Mathias Kokot

John C Carney

John A Flanders

William D Townsend

Linda M Cabeca

Karen Ruben

David Lipschutz

David C Ready

Leonard Schwartz

Thomas V Radogna

Ryan T Ross

Albert E Patnaude, Jr

Brian W Bailey

Stephen Branam

Robert A Ciampa

A method for sharing an aggregate bandwidth among a group of traffic classes may include allocating a portion of the aggregate bandwidth to one of the group of traffic classes having a first priority associated therewith, where the allocated portion is referred to as a first bandwidth. The method may include allocating an unused portion of the aggregate bandwidth to a second one of the group of traffic classes having a second priority associated therewith in conjunction with a parameter associated with a downstream device.

Shared shaping of network traffic

Techniques are described that allow a network device, such as a router, to dynamically build VLAN interfaces based on subscriber information strings included within packets. In particular, the network device comprises an interface controller and a forwarding controller, where the forwarding controller receives the packet over an Ethernet port and forwards the received packet to the interface controller. The packet includes both Ethernet tagging information and a subscriber information string. The interface controller comprises an Ethernet module that dynamically builds a primary virtual local area network (VLAN) sub-interface (PVS) based on the Ethernet tagging information. The Ethernet module also dynamically builds a subscriber VLAN sub-interface (SVS) based on the subscriber information string. The SVS allows the network device to distinguish between subscribers residing on the same VLAN, and, therefore, to provide subscriber specific services.

Dynamic building of VLAN interfaces based on subscriber information strings

A method and a network device for sharing bandwidth among a group of classes of traffic for an interface are provided. Bandwidth may be allocated to at least one traffic class of a first priority for the interface. At least some unused bandwidth of the at least one traffic class may be allocated to at least one other traffic class of a second priority for the interface. In some implementations, weighted constituents may be allocated unused interface bandwidth based on an assigned weight of each of the weighted constituents of the interface.

Method and apparatus for shared shaping

In a network device, a line card includes a first scheduler configured to perform scheduling for data units of a first type and a second scheduler that is connected in series to the first scheduler and configured to perform scheduling for data units of a second type. The schedulers may be configured in a variety of ways to achieve certain data unit flow characteristics.

Systems for scheduling the transmission of data in a network device

A buffer memory may be configured to temporarily store data in a number of queues. A processor may be configured to measure a fullness of the buffer memory. The processor may also be configured to assign sizes to the number of queues based on the fullness of the buffer memory. The processor may also adjust thresholds of drop profiles associated with the number of queues based on the sizes assigned to the number of queues.

Dynamic queue threshold extensions to random early detection

Quality of Service (&ldquo;QoS&rdquo;) variables for predetermined protocol Type data units are stored in a cache memory. For data units that are associated with a flow, thirteen bytes selected out of the Internet Protocol (&ldquo;IP&rdquo;) header are employed as at least a portion of a key to perform a cache lookup to obtain at least one Quality of Service variable from the cache. Both routing and QoS information may be stored in the cache for retrieval upon a single lookup operation.

Quality of service control mechanism and apparatus

At least a portion of the data units in a bridge/router are processed by logic circuits according to cast type. The cast type, source address and destination address of an incoming data unit are determined by examining the header. For a unicast data unit, the source address and destination address are employed to obtain a transmit port indicator from memory, and the unicast data unit is directed to the port indicated by the transmit port indicator. For a non-unicast data unit, the source address and destination address are employed to obtain a first port mask that indicates valid ports for receipt of the data unit and a second port mask that indicates valid ports for transmission of the data unit from memory. The first and second port masks are combined to generate a third port mask, and the non-unicast data unit is directed to the ports indicated by the third port mask.

Unicast, multicast, and broadcast method and apparatus

Growing community of inventors

Acton, MA, United States of America

Thomas A Lemaire