公开(公告)号：US20240297838A1

公开(公告)日：2024-09-05

申请号：US18227602

申请日：2023-07-28

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Pablo Camarillo Garvia ,  Ahmed Mohamed Ahmed Abdelsalam ,  Sonia Ben Ayed ,  Jisu Bhattacharya

IPC: H04L43/0852 ,  H04L43/12

CPC classification number: H04L43/0852 ,  H04L43/12

Abstract: Techniques for processing path tracing probe packets using hardware (e.g., hardware memory of a node) and without the involvement of a path tracing collector component of a network controller. A source node may be configured to generate and assign random flow labels to a large number of probe packets and send them through the network to a sink node. The sink node may determine whether a flow indicated by the probe packet has previously been traversed. Additionally, the sink node may determine latency values associated with the flows, and store probe packets in corresponding latency bins. The latency bins may be stored in hardware memory of the sink node. Telemetry data representing the probe packets stored in the latency bins may be sent to a network controller for further network analysis.

公开(公告)号：US20250150376A1

公开(公告)日：2025-05-08

申请号：US18758755

申请日：2024-06-28

Applicant: Cisco Technology, Inc.

Inventor： Pablo Camarillo Garvia ,  Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Jisu Bhattacharya ,  Rakesh Gandhi ,  Sonia Ben Ayed

IPC: H04L43/12 ,  H04L43/10

Abstract: Systems and techniques are provided for path tracing. For example, a process can include establishing a path tracing session associated with path tracing (PT) probe packets from a PT source node of an IPv6 network fabric. A PT probe packet can be received with a first IPv6 Destination Options Header with Path Tracing Option (DOH-PT) header that encodes path tracing information of the PT source node and indicates respective path tracing information for each PT midpoint node along a path from the PT source node to a PT sink node of the IPv6 network fabric. The received PT probe packet can be updated to include a second DOH-PT header that encodes path tracing information of the PT sink node. An updated PT probe packet includes the first and second DOH-PT headers and can be encapsulated with an additional IPv6 header corresponding to forwarding information of a collector node.

公开(公告)号：US20240297839A1

公开(公告)日：2024-09-05

申请号：US18227557

申请日：2023-07-28

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia ,  Jisu Bhattacharya ,  Sonia Ben Ayed

IPC: H04L43/106 ,  H04L43/12

CPC classification number: H04L43/106 ,  H04L43/12

Abstract: Techniques for providing an optimized behavior to source node(s) of a path tracing sequence allowing for implementation of path tracing source node behavior on an ASIC with edit-depth limitations and/or on an ASIC that does not have access to the full 64-bit timestamp. A source node having optimized behavior may be configured to record a first full 64-bit timestamp in an SRH PT-TLV header of a probe packet using the CPU of the source node. A source node having the optimized behavior may also be configured to compute a midpoint compressed data (MCD) entry and record the entry into an MCD stack of a probe packet using the NPU of the source node. A sink node and/or network controller may be configured to determine a final timestamp for the probe packet through the network by leveraging the SRH PT-TLV header and the MCD entry.

公开(公告)号：US11962473B1

公开(公告)日：2024-04-16

申请号：US18133950

申请日：2023-04-12

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia ,  Sonia Ben Ayed

IPC: H04L12/851 ,  H04L41/0895 ,  H04L41/122 ,  H04L41/40 ,  H04L43/10

CPC classification number: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

Abstract: Techniques for monitoring data transport in a network virtualization function chain (chain). A path tracing packet is generated having a Midpoint Compressed Data (MCD) to collect path tracing information of the chain. The network virtualization function node is configured to record an MCD containing Wide Local Path Tracing Identification (WL PT ID). The WL PT ID includes a first field having a value that indicates that a non-standard path tracing format is to be used and a second field that indicates a particular path tracing format to be used. The path tracing packet is passed through the chain and is received back after passing through the chain. Data collected by the path tracing packet is then analyzed to determine which network virtualization function nodes and chains the path tracing packet passed through and the amount of time taken for the path tracing packet to pass through the chain.

公开(公告)号：US20240430189A1

公开(公告)日：2024-12-26

申请号：US18609148

申请日：2024-03-19

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Rakesh Gandhi ,  Pablo Camarillo Garvia ,  Ahmed Mohamed Ahmed Abdelsalam ,  Sonia Ben Ayed

IPC: H04L43/106 ,  H04L43/0829 ,  H04L43/0852

Abstract: This disclosure describes techniques and mechanisms for performing passive measurement for combined one-way latency, packet loss metrics along with liveness detection using customer data packets ingested at a sink node in hardware for Level 2 and Level 3 VPN services. The customer data packets are sampled and copied for measurement either at source node or sink node. The duplicated measurement packet headers are punted based on the IPV6 destination option type to hardware analytics engine at sink node for analytics that populates histogram bins using the timestamps from the packets. Using the transmitted packets during a period, and received packets in all the bins, packet loss is measured. Based on the packets received status, liveness state is detected by the sink node and notified to the source node.

公开(公告)号：US20240137281A1

公开(公告)日：2024-04-25

申请号：US18133950

申请日：2023-04-11

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia ,  Sonia Ben Ayed

IPC: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

CPC classification number: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

Abstract: Techniques for monitoring data transport in a network virtualization function chain (chain). A path tracing packet is generated having a Midpoint Compressed Data (MCD) to collect path tracing information of the chain. The network virtualization function node is configured to record an MCD containing Wide Local Path Tracing Identification (WL PT ID). The WL PT ID includes a first field having a value that indicates that a non-standard path tracing format is to be used and a second field that indicates a particular path tracing format to be used. The path tracing packet is passed through the chain and is received back after passing through the chain. Data collected by the path tracing packet is then analyzed to determine which network virtualization function nodes and chains the path tracing packet passed through and the amount of time taken for the path tracing packet to pass through the chain.

公开(公告)号：US20240430188A1

公开(公告)日：2024-12-26

申请号：US18371848

申请日：2023-09-22

Applicant: Cisco Technology, Inc.

Inventor： Rakesh Gandhi ,  Clarence Filsfils ,  Sonia Ben Ayed ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia

IPC: H04L43/10 ,  H04L43/04 ,  H04L43/08 ,  H04L45/24

Abstract: Techniques for determine latency, loss, and liveness performance metrics associated with ECMP routes. The techniques may include determining that a TWAMP probe is to be sent from a first node to a second node along an equal-cost multipath ECMP route. In some examples, the first node may generate a packet for sending the TWAMP probe to the second node. The packet may include information specifying a forward path and reverse path to be traversed by the packet. In examples, the first node may send the packet to the second node along the ECMP route and subsequently receive the packet including telemetry data associated with the second node and a midpoint node of the ECMP route. Based at least in part on the telemetry data, the first node may determine a metric indicative of a performance measurement associated with the ECMP route.

公开(公告)号：US20240235946A9

公开(公告)日：2024-07-11

申请号：US18133950

申请日：2023-04-12

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia ,  Sonia Ben Ayed

IPC: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

CPC classification number: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

Abstract: Techniques for monitoring data transport in a network virtualization function chain (chain). A path tracing packet is generated having a Midpoint Compressed Data (MCD) to collect path tracing information of the chain. The network virtualization function node is configured to record an MCD containing Wide Local Path Tracing Identification (WL PT ID). The WL PT ID includes a first field having a value that indicates that a non-standard path tracing format is to be used and a second field that indicates a particular path tracing format to be used. The path tracing packet is passed through the chain and is received back after passing through the chain. Data collected by the path tracing packet is then analyzed to determine which network virtualization function nodes and chains the path tracing packet passed through and the amount of time taken for the path tracing packet to pass through the chain.

公开(公告)号：US20240163179A1

公开(公告)日：2024-05-16

申请号：US18422801

申请日：2024-01-25

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Pablo Camarillo Garvia ,  Sonia Ben Ayed

IPC: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

CPC classification number: H04L41/122 ,  H04L41/0895 ,  H04L41/40 ,  H04L43/10

Abstract: Techniques for monitoring data transport in a network virtualization function (NVF) chain. A path tracing packet is generated having a Midpoint Compressed Data (MCD) to collect path tracing information of the NVF chain. The NVF node is configured to record an MCD containing Wide Local Path Tracing Identification (WL PT ID). The WL PT ID includes a first field having a value that indicates that a non-standard path tracing format is to be used and has a second field that indicates a particular path tracing format to be used. The path tracing packet is passed through the NVF chain and is then received back again after passing through the NVF chain. Data collected by the path tracing packet is analyzed to determine which NVF nodes the path tracing packet passed through, and the amount of time taken for the path tracing packet to pass through, the NVF chain.