公开(公告)号：US11240151B2

公开(公告)日：2022-02-01

申请号：US16709611

申请日：2019-12-10

Applicant: Juniper Networks, Inc.

Inventor： Craig R. Frink ,  Weidong Xu ,  Anurag P. Gupta ,  Harshad B Agashe

IPC: H04L12/28 ,  H04L12/721 ,  G06F9/48 ,  H04L12/713 ,  H04L12/741 ,  H04L12/861 ,  H04L12/70

Abstract: An apparatus for switching network traffic includes an ingress packet forwarding engine and an egress packet forwarding engine. The ingress packet forwarding engine is configured to determine, in response to receiving a network packet, an egress packet forwarding engine for outputting the network packet and enqueue the network packet in a virtual output queue. The egress packet forwarding engine is configured to output, in response to a first scheduling event and to the ingress packet forwarding engine, information indicating the network packet in the virtual output queue and that the network packet is to be enqueued at an output queue for an output port of the egress packet forwarding engine. The ingress packet forwarding engine is further configured to dequeue, in response to receiving the information, the network packet from the virtual output queue and enqueue the network packet to the output queue.

公开(公告)号：US10721187B1

公开(公告)日：2020-07-21

申请号：US15599394

申请日：2017-05-18

Applicant: Juniper Networks, Inc.

Inventor： Gary Goldman ,  Sarin Thomas ,  Jean-Marc Frailong ,  Harshad B Agashe

IPC: H04L12/933 ,  H04L12/935 ,  H04L12/873 ,  H04L12/863 ,  H04L12/931 ,  H04L12/861

Abstract: A system and method for routing network packets. A switch fabric connects a plurality of forwarding units, including an egress forwarding unit and two or more ingress forwarding units, each ingress forwarding unit forwarding network packets to the egress forwarding unit via the switch fabric. The egress forwarding unit includes a scheduler and an output queue. Each ingress forwarding unit includes a Virtual Output Queue (VOQ) connected to the output queue and a VOQ manager. The scheduler receives time of arrival information for network packets stored in the VOQs, determines, based on the time of arrival information for each network packet, a device resident time for the network packets stored in the VOQs, and requests, from one of the VOQs and based on the device resident times, the network packet with the longest device resident time.

公开(公告)号：US11496398B2

公开(公告)日：2022-11-08

申请号：US17249723

申请日：2021-03-10

Applicant: Juniper Networks, Inc.

Inventor： Anuj Kumar Srivastava ,  Gary Goldman ,  Harshad B Agashe ,  Dinesh Jaiswal ,  Piyush Jain ,  Naveen K Jain

IPC: H04L47/12 ,  H04L49/25

Abstract: An ingress fabric endpoint coupled to a switch fabric within a network device reorders packet flows based on congestion status. In one example, the ingress fabric endpoint receives packet flows for switching across the switch fabric. The ingress fabric endpoint assigns each packet for each packet flow to a fast path or a slow path for packet switching. The ingress fabric endpoint processes, to generate a stream of cells for switching across the switch fabric, packets from the fast path and the slow path to maintain a first-in-first-out ordering of the packets within each packet flow. The ingress fabric endpoint switches a packet of a first packet flow after switching a packet of a second packet flow despite receiving the packet of the first packet flow before the packet of the second packet flow.

公开(公告)号：US09985912B1

公开(公告)日：2018-05-29

申请号：US14871706

申请日：2015-09-30

Applicant: Juniper Networks, Inc.

Inventor： Rahul Wagh ,  Kapil Suri ,  Gurjeet Singh ,  Harshad B Agashe ,  Srihari R. Vegesna ,  Dinesh Jaiswal

IPC: H04L12/861 ,  H04L12/935 ,  H04L12/801 ,  H04L12/933

CPC classification number: H04L49/30 ,  H04L47/18 ,  H04L49/1569 ,  H04L49/1576

Abstract: A system and method of transferring cells through a switch fabric having a shared memory crossbar switch, a plurality of cell receive blocks and a plurality of cell transmit blocks. The system determines, based on a number of cells queued up in respective output buffers in the cell transmit blocks, output buffers in the cell transmit blocks that can receive cells on a low latency path. The cells transferred include first cells that can be transferred on the low latency path and second cells that cannot be transferred via the low latency path. The first cells are transferred via a bypass mechanism in shared memory to the output buffers. The second cells are transferred by writing the second cells to shared memory, reading the second cells from shared memory and transferring the second cells read from shared memory to the output buffers in the cell transmit blocks.

公开(公告)号：US11784925B2

公开(公告)日：2023-10-10

申请号：US17645498

申请日：2021-12-22

Applicant: Juniper Networks, Inc.

Inventor： Craig R. Frink ,  Weidong Xu ,  Anurag P. Gupta ,  Harshad B Agashe

IPC: H04L45/00 ,  H04L45/586 ,  H04L45/74 ,  H04L49/90 ,  G06F9/48 ,  H04L49/9047 ,  H04L12/70

CPC classification number: H04L45/566 ,  G06F9/4887 ,  H04L45/586 ,  H04L45/74 ,  H04L49/9036 ,  H04L49/9047 ,  H04L2012/5681

Abstract: An apparatus for switching network traffic includes an ingress packet forwarding engine and an egress packet forwarding engine. The ingress packet forwarding engine is configured to determine, in response to receiving a network packet, an egress packet forwarding engine for outputting the network packet and enqueue the network packet in a virtual output queue. The egress packet forwarding engine is configured to output, in response to a first scheduling event and to the ingress packet forwarding engine, information indicating the network packet in the virtual output queue and that the network packet is to be enqueued at an output queue for an output port of the egress packet forwarding engine. The ingress packet forwarding engine is further configured to dequeue, in response to receiving the information, the network packet from the virtual output queue and enqueue the network packet to the output queue.

公开(公告)号：US11290395B1

公开(公告)日：2022-03-29

申请号：US16933590

申请日：2020-07-20

Applicant: Juniper Networks, Inc.

Inventor： Gary Goldman ,  Sarin Thomas ,  Jean-Marc Frailong ,  Harshad B Agashe

IPC: H04L12/933 ,  H04L12/935 ,  H04L12/873 ,  H04L12/863 ,  H04L12/931 ,  H04L49/00 ,  H04L49/9057 ,  H04L49/20

Abstract: A system and method for routing network packets. A switch fabric connects a plurality of forwarding units, including an egress forwarding unit and two or more ingress forwarding units, each ingress forwarding unit forwarding network packets to the egress forwarding unit via the switch fabric. The egress forwarding unit includes a scheduler and an output queue. Each ingress forwarding unit includes a Virtual Output Queue (VOQ) connected to the output queue and a VOQ manager. The scheduler receives time of arrival information for packet groups stored in the VOQs, determines, based on the time of arrival information for each packet group, a device resident time for each packet group, and discards the packet groups when the determined device resident time for the packet group is greater than a maximum resident time.

公开(公告)号：US10951527B2

公开(公告)日：2021-03-16

申请号：US16235874

申请日：2018-12-28

Applicant: Juniper Networks, Inc.

Inventor： Anuj Kumar Srivastava ,  Gary Goldman ,  Harshad B Agashe ,  Dinesh Jaiswal ,  Piyush Jain ,  Naveen K Jain

IPC: H04L12/801 ,  H04L12/947

Abstract: An ingress fabric endpoint coupled to a switch fabric within a network device reorders packet flows based on congestion status. In one example, the ingress fabric endpoint receives packet flows for switching across the switch fabric. The ingress fabric endpoint assigns each packet for each packet flow to a fast path or a slow path for packet switching. The ingress fabric endpoint processes, to generate a stream of cells for switching across the switch fabric, packets from the fast path and the slow path to maintain a first-in-first-out ordering of the packets within each packet flow. The ingress fabric endpoint switches a packet of a first packet flow after switching a packet of a second packet flow despite receiving the packet of the first packet flow before the packet of the second packet flow.

公开(公告)号：US11316796B2

公开(公告)日：2022-04-26

申请号：US16730031

申请日：2019-12-30

Applicant: Juniper Networks, Inc.

Inventor： Senthil Duraisamy ,  Harshad B Agashe

IPC: H04L12/863 ,  H04L47/62 ,  H04L49/101 ,  H04L49/1515 ,  H04L49/00

Abstract: In general, techniques are described for facilitating balanced cell handling by fabric cores of a fabric plane for an internal device switch fabric. In some examples, a routing system includes a plurality of fabric endpoints and a switching fabric comprising a fabric plane to switch cells among the fabric endpoints. The fabric plane includes two fabric cores and one or more inter-core links connecting the fabric cores. Each fabric core selects an output port of the fabric core to which to route a received cell of the cells based on (i) an input port of the fabric core on which the received cell was received and (ii) a destination fabric endpoint for the received cell, at least a portion of the selected output ports being connected to the inter-core links, and switches the received cell to the selected output port.

公开(公告)号：US20220124030A1

公开(公告)日：2022-04-21

申请号：US17645498

申请日：2021-12-22

Applicant: Juniper Networks, Inc.

Inventor： Craig R. Frink ,  Weidong Xu ,  Anurag P. Gupta ,  Harshad B Agashe

IPC: H04L45/00 ,  G06F9/48 ,  H04L45/586 ,  H04L45/74 ,  H04L49/90 ,  H04L49/9047

Abstract: An apparatus for switching network traffic includes an ingress packet forwarding engine and an egress packet forwarding engine. The ingress packet forwarding engine is configured to determine, in response to receiving a network packet, an egress packet forwarding engine for outputting the network packet and enqueue the network packet in a virtual output queue. The egress packet forwarding engine is configured to output, in response to a first scheduling event and to the ingress packet forwarding engine, information indicating the network packet in the virtual output queue and that the network packet is to be enqueued at an output queue for an output port of the egress packet forwarding engine. The ingress packet forwarding engine is further configured to dequeue, in response to receiving the information, the network packet from the virtual output queue and enqueue the network packet to the output queue.

公开(公告)号：US11070474B1

公开(公告)日：2021-07-20

申请号：US16166944

申请日：2018-10-22

Applicant: Juniper Networks, Inc.

Inventor： Piyush Jain ,  Anuj Kumar Srivastava ,  Naveen K Jain ,  Dinesh Jaiswal ,  Harshad B Agashe

IPC: H04L12/937 ,  H04L12/803 ,  H04L12/933 ,  H04L12/741

Abstract: A network device includes a memory, a plurality of packet processors, a switch fabric coupling the plurality of processors, and processing circuitry. The processing circuitry is configured to receive a data stream to be transmitted on a switch fabric and determine a plurality of credit counts, each credit count being assigned to a respective subchannel of a plurality of subchannels. The packet processor is further configured to determine per-subchannel occupancy of the memory for the plurality of subchannels, select, based on the plurality of credit counts and the per-subchannel occupancy of the memory, a subchannel of the plurality of subchannels for transmitting a cell of a plurality of cells for the data stream, and output data for the cell to the memory for output by the selected subchannel.