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    Data stream pipelining and replication at a delivery node of a content delivery network
    11.
    发明授权
    Data stream pipelining and replication at a delivery node of a content delivery network 有权

    公开(公告)号：US10536561B2

    公开(公告)日：2020-01-14

    申请号：US15784361

    申请日：2017-10-16

    Applicant: Cisco Technology, Inc.

    Inventor： Pierre Pfister ,  William Mark Townsley ,  Yoann Louis Simon Desmouceaux ,  Guillaume Michel Ruty

    IPC: H04L29/06 ,  G06F13/28 ,  G06F3/06 ,  G06F13/42 ,  H04L29/08

    Abstract: A content delivery node receives data packets carrying content from an upstream source of content, and writes segments of the received content directly to a memory buffer of a memory using direct memory access (DMA) data transfers. The node derives, for each segment, respective segment-specific metadata based on contents of the segment, and stores the respective segment-specific metadata in the memory. The node receives from multiple downstream client devices respective requests for the same content. Each request includes client-specific information. Responsive to the requests, the node: identifies one or more segments that satisfy the requests; generates, for each client device, client-specific metadata using the client-specific information and the segment-specific metadata for the one or more segments; constructs, for each client, a client-specific data packet that includes the one or more segments and the client-specific metadata; and transmits the client-specific data packets to the downstream client devices.

    TRANSPARENT AND EFFICIENT MULTI-DESTINATION TCP COMMUNICATIONS BASED ON BIT INDEXED EXPLICIT REPLICATION
    12.
    发明申请
    TRANSPARENT AND EFFICIENT MULTI-DESTINATION TCP COMMUNICATIONS BASED ON BIT INDEXED EXPLICIT REPLICATION 审中-公开

    公开(公告)号：US20190075061A1

    公开(公告)日：2019-03-07

    申请号：US16179098

    申请日：2018-11-02

    Applicant: Cisco Technology, Inc.

    Inventor： Pierre Pfister ,  Pascal Thubert ,  Victor Nguyen

    IPC: H04L12/927 ,  H04L12/18 ,  H04L29/06

    CPC classification number: H04L47/806 ,  H04L12/1868 ,  H04L69/161 ,  H04L2212/00

    Abstract: Systems, methods, and computer-readable storage media for multi-destination TCP communications using bit indexed explicit replication (BIER). In some examples, a system can generate a TCP packet associated with a TCP session involving a set of destination devices, and encode an array of bits into the TCP packet to yield a TCP multicast packet. The array of bits can define the destination devices as destinations for the multicast packet. The system can transmit the TCP multicast packet towards the destination devices through a BIER domain. The system can receive acknowledgements from a first subset of the destination devices. Based on the acknowledgements, the system can determine that the first subset of the destination devices received the multicast packet and a second subset of the destination devices did not receive the multicast packet. The system can then retransmit the multicast packet to the second subset of the destination devices.

    TRANSPARENT AND EFFICIENT MULTI-DESTINATION TCP COMMUNICATIONS BASED ON BIT INDEXED EXPLICIT REPLICATION
    14.
    发明申请
    TRANSPARENT AND EFFICIENT MULTI-DESTINATION TCP COMMUNICATIONS BASED ON BIT INDEXED EXPLICIT REPLICATION 审中-公开

    公开(公告)号：US20180063024A1

    公开(公告)日：2018-03-01

    申请号：US15252101

    申请日：2016-08-30

    Applicant: Cisco Technology, Inc.

    Inventor： Pierre Pfister ,  Pascal Thubert ,  Victor Nguyen

    IPC: H04L12/927 ,  H04L12/18 ,  H04L29/06

    CPC classification number: H04L69/161 ,  H04L12/1868 ,  H04L2212/00

    Abstract: Systems, methods, and computer-readable storage media for multi-destination TCP communications using bit indexed explicit replication (BIER). In some examples, a system can generate a TCP packet associated with a TCP session involving a set of destination devices, and encode an array of bits into the TCP packet to yield a TCP multicast packet. The array of bits can define the destination devices as destinations for the multicast packet. The system can transmit the TCP multicast packet towards the destination devices through a BIER domain. The system can receive acknowledgements from a first subset of the destination devices. Based on the acknowledgements, the system can determine that the first subset of the destination devices received the multicast packet and a second subset of the destination devices did not receive the multicast packet. The system can then retransmit the multicast packet to the second subset of the destination devices.

    Area-specific broadcasting using bit indexed explicit replication
    17.
    发明授权
    Area-specific broadcasting using bit indexed explicit replication 有权

    公开(公告)号：US11438186B2

    公开(公告)日：2022-09-06

    申请号：US16834860

    申请日：2020-03-30

    Applicant: Cisco Technology, Inc.

    Inventor： Ijsbrand Wijnands ,  Pierre Pfister ,  Neale D. R. Ranns ,  W. Mark Townsley ,  Gregory J. Shepherd

    IPC: H04L12/18 ,  H04L45/745

    Abstract: Methods, network devices and computer readable media are disclosed relating to a communication network. In one embodiment, a method includes receiving a message comprising a message bit array. The message bit array identifies egress nodes for the message within a bit indexed explicit replication (BIER) domain of a communications network. A first bit position in the message bit array represents a first one or more of the egress nodes, and a bit value at the first bit position indicates that the message is to be forwarded to one of the first one or more of the egress nodes. The method further includes accessing a first forwarding table entry corresponding to the first bit position, determining whether the first bit position is an anycast bit position having multiple corresponding forwarding table entries, and forwarding the message to one of the first one or more of the egress nodes.

    Highly-available distributed network address translation (NAT) architecture with failover solutions
    18.
    发明授权
    Highly-available distributed network address translation (NAT) architecture with failover solutions 有权

    公开(公告)号：US11436111B2

    公开(公告)日：2022-09-06

    申请号：US16592613

    申请日：2019-10-03

    Applicant: Cisco Technology, Inc.

    Inventor： Pierre Pfister ,  Ian James Wells ,  Kyle Andrew Donald Mestery ,  William Mark Townsley ,  Yoann Desmouceaux ,  Guillaume Ruty ,  Aloys Augustin

    IPC: G06F11/20 ,  G06F9/455 ,  H04L61/2503 ,  H04L61/58

    Abstract: This disclosure describes techniques for providing a distributed scalable architecture for Network Address Translation (NAT) systems with high availability and mitigations for flow breakage during failover events. The NAT servers may include functionality to serve as fast-path servers and/or slow-path servers. A fast-path server may include a NAT worker that includes a cache of NAT mappings to perform stateful network address translation and to forward packets with minimal latency. A slow-path server may include a mapping server that creates new NAT mappings, depreciates old ones, and answers NAT worker state requests. The NAT system may use virtual mapping servers (VMSs) running on primary physical servers with state duplicated VMSs on different physical failover servers. Additionally, the NAT servers may implement failover solutions for dynamically allocated routable address/port pairs assigned to new sessions by assigning new outbound address/port pairs when a session starts and broadcasting pairing information.

    DISTRIBUTED RESILIENT LOAD-BALANCING FOR MULTIPATH TRANSPORT PROTOCOLS
    19.
    发明申请
    DISTRIBUTED RESILIENT LOAD-BALANCING FOR MULTIPATH TRANSPORT PROTOCOLS 有权

    公开(公告)号：US20210329069A1

    公开(公告)日：2021-10-21

    申请号：US16853048

    申请日：2020-04-20

    Applicant: Cisco Technology, Inc.

    Inventor： Yoann Desmouceaux ,  Pierre Pfister ,  Aloys Augustin ,  Mohammed Hawari

    IPC: H04L29/08 ,  H04L12/707 ,  H04L29/06

    Abstract: Techniques are described for providing a distributed application load-balancing architecture that supports multipath transport protocol for client devices connecting to an application service. Rather than having client devices generate new network five-tuples for new subflows to the application servers, the techniques described herein include shifting the burden to the application servers to ensure that the new network five-tuples land in the same bucket in the consistent hashing table. The application servers may receive a hashing function utilized by the load balancers to generate the hash of the network five-tuple. By having the application servers generate the hashes, the load balancers are able to continue stateless, low-level processing of the packets to route them to the correct application servers. In this way, additional subflows can be opened for client devices according to a multipath transport protocol while ensuring that the subflows are routed to the correct application server.

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