公开(公告)号：US10367751B2

公开(公告)日：2019-07-30

申请号：US15439144

申请日：2017-02-22

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Dipankar Bhatt Acharya ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L12/869 ,  H04L12/851 ,  H04L1/18

Abstract: One embodiment includes multiple distribution nodes sending packets of different ordered sets of packets among multiple packet switching devices arranged in a single stage topology to reach a reordering node. The reordering node receives these packets sent over the different paths and stores them in reordering storage, such as, but not limited to, in queues for each distribution node and packet switching device combination. The reordering node sends packets stored in the reordering storage from the reordering node in original orderings. In response to determining that an aggregation quantum of packets received from the multiple distribution nodes via a particular packet switching device and stored in the reordering storage is outside a range or value, packets being communicated via the particular packet switching device to the reordering node are rate limited.

公开(公告)号：US20180167311A1

公开(公告)日：2018-06-14

申请号：US15377871

申请日：2016-12-13

Applicant: Cisco Technology, Inc.

Inventor： Naader Hasani ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L12/761 ,  H04L12/18 ,  H04L12/741

CPC classification number: H04L45/16 ,  H04L12/18 ,  H04L12/1886 ,  H04L45/74

Abstract: In one embodiment, multicast packets including, but not limited to, Bit Index Explicit Replication (BIER) multicast packets, are forwarded in a network. An independent lookup operation is performed on each destination node identified in the received packet to determine a nexthop to which to forward a copy of the packet. Typically, some or possibly all of these lookup operations are performed in parallel, in contrast to the sequential lookup and bit masking operations of previous BIER packet forwarding specifications and implementations. In one embodiment, the selection of a nexthop for a destination node is made from a set of two or more nexthop nodes on different Equal-Cost Multi-Paths (ECMPs). In one embodiment, compact data structures are used in determining how to forward the received multicast packet, with these compact data structures providing requisite forwarding information without allocating space to unassigned destination nodes.

公开(公告)号：US20190014052A1

公开(公告)日：2019-01-10

申请号：US15641661

申请日：2017-07-05

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L12/823 ,  H04L12/801 ,  H04L12/833

CPC classification number: H04L47/32 ,  H04L47/10 ,  H04L47/12 ,  H04L47/20 ,  H04L47/2441 ,  H04L47/2483 ,  H04L47/31 ,  H04L47/41 ,  H04L47/621 ,  H04L47/6255

Abstract: In one embodiment, a network node automatically cycles among packet traffic flows and subjects the currently selected packet flows to varying drop probabilities in a packet network, such as, but not limited to in response to congestion in a device or network. Packets of the currently selected packet traffic flows are subjected to a drop or forward decision, while packets of other packet traffic flows are not. By cycling through all of these packet traffic flows, all of these packet flows are subjected to the drop or forward decision in the long term approximately uniformly providing fairness to all packet traffic flows. In the short term, only packets of a currently selected flow are targeted for possible dropping providing unfairness to the currently selected flows, while possibly providing communication efficiencies by affecting the currently selected, but not all flows.

公开(公告)号：US11063876B2

公开(公告)日：2021-07-13

申请号：US16505651

申请日：2019-07-08

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L1/00 ,  H04L12/823 ,  H04L12/851 ,  H04L12/891 ,  H04L12/863 ,  H04L12/813 ,  H04L12/801 ,  H04L12/833

Abstract: In one embodiment, a network node automatically cycles among packet traffic flows and subjects the currently selected packet flows to varying drop probabilities in a packet network, such as, but not limited to in response to congestion in a device or network. Packets of a currently selected packet traffic flow are subjected to a drop or forward decision with a higher drop probability than packets of a currently non-selected flow. By cycling through all of these packet traffic flows, all of these packet flows are subjected to the drop or forward decision in the long term approximately uniformly, thus providing fairness to all packet traffic flows. In the short term, packets of a currently selected flow are targeted for possible dropping with a higher drop probability providing unfairness to the currently selected flows over the non-selected flows.

公开(公告)号：US10320686B2

公开(公告)日：2019-06-11

申请号：US15372330

申请日：2016-12-07

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L12/823 ,  H04L12/803 ,  H04L12/813 ,  H04L12/863 ,  H04L12/947 ,  H04L29/06 ,  H04L12/707 ,  H04L12/815

Abstract: One embodiment includes a packet switching device load balancing eligible packets in response to a policing drop decision. The packet switching device sends packets of a particular packet flow out of the packet switching device over a first path in the network towards a destination node; and in response to a policer discipline determining to drop a particular packet of the particular packet flow, switching from said sending packets over the first path to sending packets of the particular packet flow out of the packet switching device over a second path in the network towards the destination node (possibly by switching output queues associated with the two different paths), with the second path being different than the first path, and with the particular packet not being dropped but being sent out of the packet switching device towards the destination node.

公开(公告)号：US10205805B2

公开(公告)日：2019-02-12

申请号：US15357346

申请日：2016-11-21

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L29/06 ,  H04L12/931 ,  H04L12/741

Abstract: One embodiment is associated with dropping or admitting packets to an output queue using occupancy values of virtual destination queues which are updated according to different independent disciplines upon the enqueuing of a packet to an output queue, and the dequeuing of that packet from an output queue. In one embodiment, a virtual destination queue is determined for a packet. A policing decision is made whether to drop the packet or admit the packet to the output queue based on the occupancy level of the determined virtual destination queue, which is updated upon admission. Packets are dequeued in first-in-first-out order from the output queue. For a dequeued one or more packets, one or more of the occupancy values of the virtual destination queues are updated based a scheduling policy that is independent of the particular virtual destination queue(s) associated with the dequeued packets.

公开(公告)号：US20180146074A1

公开(公告)日：2018-05-24

申请号：US15357346

申请日：2016-11-21

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, JR. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L29/06 ,  H04L12/931 ,  H04L12/741

CPC classification number: H04L69/22 ,  H04L45/74 ,  H04L49/354

Abstract: One embodiment is associated with dropping or admitting packets to an output queue using occupancy values of virtual destination queues which are updated according to different independent disciplines upon the enqueuing of a packet to an output queue, and the dequeuing of that packet from an output queue. In one embodiment, a virtual destination queue is determined for a packet. A policing decision is made whether to drop the packet or admit the packet to the output queue based on the occupancy level of the determined virtual destination queue, which is updated upon admission. Packets are dequeued in first-in-first-out order from the output queue. For a dequeued one or more packets, one or more of the occupancy values of the virtual destination queues are updated based a scheduling policy that is independent of the particular virtual destination queue(s) associated with the dequeued packets.

公开(公告)号：US10715439B2

公开(公告)日：2020-07-14

申请号：US16541931

申请日：2019-08-15

Applicant: Cisco Technology, Inc.

Inventor： Naader Hasani ,  Shishir Gupta ,  David Delano Ward ,  Mohammed Ismael Tatar ,  Shahin Habibi ,  Sreedhar Ravipalli ,  David Richard Barach

IPC: H04L12/743 ,  H04L12/745

Abstract: One embodiment performs longest prefix matching operations in one or more different manners that provides packet processing and/or memory efficiencies in the processing of packets. In one embodiment, a packet switching device determines a set of one or more mask lengths of a particular conforming entry of a multibit trie or other data structure that matches a particular address of a packet via a lookup operation in a mask length data structure. A conforming entry refers to an entry which has less than or equal to a maximum number of different prefix lengths, with this maximum number corresponding to the maximum number of prefix lengths which can be searched in parallel in the address space for a longest matching prefix by the implementing hardware. The packet switching device then performs corresponding hash table lookup operation(s) in parallel in determining an overall longest matching prefix for the particular address.

公开(公告)号：US10367749B2

公开(公告)日：2019-07-30

申请号：US15641661

申请日：2017-07-05

Applicant: Cisco Technology, Inc.

Inventor： John J. Williams, Jr. ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L1/00 ,  H04L12/823 ,  H04L12/851 ,  H04L12/891 ,  H04L12/863 ,  H04L12/813 ,  H04L12/801 ,  H04L12/833

Abstract: In one embodiment, a network node automatically cycles among packet traffic flows and subjects the currently selected packet flows to varying drop probabilities in a packet network, such as, but not limited to in response to congestion in a device or network. Packets of the currently selected packet traffic flows are subjected to a drop or forward decision, while packets of other packet traffic flows are not. By cycling through all of these packet traffic flows, all of these packet flows are subjected to the drop or forward decision in the long term approximately uniformly providing fairness to all packet traffic flows. In the short term, only packets of a currently selected flow are targeted for possible dropping providing unfairness to the currently selected flows, while possibly providing communication efficiencies by affecting the currently selected, but not all flows.

公开(公告)号：US10212069B2

公开(公告)日：2019-02-19

申请号：US15377871

申请日：2016-12-13

Applicant: Cisco Technology, Inc.

Inventor： Naader Hasani ,  Mohammed Ismael Tatar ,  David Delano Ward

IPC: H04L12/761 ,  H04L12/18 ,  H04L12/741

Abstract: In one embodiment, multicast packets including, but not limited to, Bit Index Explicit Replication (BIER) multicast packets, are forwarded in a network. An independent lookup operation is performed on each destination node identified in the received packet to determine a nexthop to which to forward a copy of the packet. Typically, some or possibly all of these lookup operations are performed in parallel, in contrast to the sequential lookup and bit masking operations of previous BIER packet forwarding specifications and implementations. In one embodiment, the selection of a nexthop for a destination node is made from a set of two or more nexthop nodes on different Equal-Cost Multi-Paths (ECMPs). In one embodiment, compact data structures are used in determining how to forward the received multicast packet, with these compact data structures providing requisite forwarding information without allocating space to unassigned destination nodes.