公开(公告)号：US20230021278A1

公开(公告)日：2023-01-19

申请号：US17741241

申请日：2022-05-10

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Francois Clad ,  Bertrand Herbert Guy Duvivier ,  Mikhail Koldychev ,  Rakesh Gandhi ,  Sagar Soni

IPC: H04L45/42 ,  H04L45/00 ,  H04L45/74 ,  H04L45/28

Abstract: Disclosed are systems, apparatuses, methods, and computer-readable media to implement circuit-style network with co-routed bidirectional network paths. A method includes receiving a request for a circuit policy between a source node and a destination node, the circuit policy defining a co-routed bidirectional policy between the source node and the destination node; requesting a path compute service to identify a path between the source node and the destination node that satisfies the circuit policy through a first network; receiving a path identifying a first set of network nodes that satisfy the circuit policy; configuring each node in the first set of network nodes within the first network with the circuit policy; and establishing a connection using the path that satisfies the circuit policy between the source node and the destination node.

公开(公告)号：US11388088B2

公开(公告)日：2022-07-12

申请号：US16675083

申请日：2019-11-05

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Zafar Ali ,  Syed Kamran Raza ,  Ahmed Refaat Bashandy ,  Nagendra Kumar Nainar ,  Carlos M. Pignataro ,  Jaganbabu Rajamanickam ,  Rakesh Gandhi ,  Bhupendra Yadav ,  Faisal Iqbal

IPC: H04L45/00 ,  H04L43/106 ,  H04L45/02 ,  H04L41/0246 ,  H04L101/659 ,  H04L45/302 ,  H04L45/741

Abstract: In one embodiment, segment routing (SR) network processing of packets is performed which includes operations signaling and processing of packets in manners providing processing and/or memory efficiencies. One embodiment includes acquiring a segment routing particular packet by a particular router in a network. Responsive to the particular router data plane ascertained during fast path processing by a fast path processing unit that the segment routing particular packet is to be Operations, Administration, and Maintenance (OAM) processed by a different processing unit in the particular router, communicating a time stamp of a current time and the segment routing particular packet including a segment routing header that includes OAM signaling from said fast path processing to the different processing unit, with fast path processing being hardware-based packet processing by the fast path processing unit. The segment routing particular packet is OAM processing by the different processing unit.

公开(公告)号：US20220173992A1

公开(公告)日：2022-06-02

申请号：US17344443

申请日：2021-06-10

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Ahmed Mohamed Ahmed Abdelsalam ,  Rakesh Gandhi ,  Pablo Camarillo Garvia ,  Francois Clad

IPC: H04L12/26 ,  H04L12/24

Abstract: Techniques for optimizing technologies related to network path tracing and network delay measurements are described herein. Some of the techniques may include using an IPv6 header option and/or segment identifier field of a segment list or a TLV of a segment routing header as a telemetry data carrier. The techniques may also include using an SRv6 micro-segment (uSID) instruction to indicate to a node of a network that the node is to perform one or more path tracing actions and encapsulating the packet and forward. Additionally, the techniques may include using short interface identifiers corresponding to node interfaces to trace a packet path through a network. Further, the techniques may include using short timestamps to determine delay measurements associated with sending a packet through a network. In various examples, the techniques described above and herein may be used with each other to optimize network path tracing and delay measurement techniques.

公开(公告)号：US10230605B1

公开(公告)日：2019-03-12

申请号：US16121535

申请日：2018-09-04

Applicant: Cisco Technology, Inc.

Inventor： Clarence Filsfils ,  Rakesh Gandhi ,  Tarek Saad ,  Sagar Soni ,  Patrick Khordoc

IPC: H04L12/28 ,  H04L12/26 ,  H04L12/44 ,  H04J1/16

Abstract: The present technology is directed to a scalable solution for end-to-end performance delay measurement for Segment Routing Policies on both SR-MPLS and SRv6 data planes. The scalability of the solution stems from the use of distributed PM sessions along SR Policy ECMP paths. This is achieved by dividing the SR policy into smaller sections comprised of SPT trees or sub-paths, each of which is associated with a Root-Node. Downstream SID List TLVs may be used in Probe query messages for signaling SPT information to the Root-Nodes Alternatively, this SPT signaling may be accomplished by using a centralized controller. Root-Nodes are responsible for dynamically creating PM sessions and measuring delay metrics for their associated SPT tree section. The root-nodes then send the delay metrics for their local section to an ingress PE node or to a centralized controller using delay metric TLV field of the response message.

公开(公告)号：US20250158911A1

公开(公告)日：2025-05-15

申请号：US18506870

申请日：2023-11-10

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Prasad Mishra ,  Nitin Kumar ,  Vishal Madhav Ninawe ,  Rakesh Gandhi

IPC: H04L43/12 ,  H04L43/062 ,  H04L43/0817

Abstract: In some aspects, a computer-implemented method for performance monitoring in a multicast network, includes a controller causing a source router to originate a probe data packet. The controller may also originate, at the source router, the probe data packet, where the probe data packet is a data packet intended to measure performance data associated with one or more legs of a multicast distribution tree. Further, the source router may transmit the probe data packet through the multicast distribution tree using a probe identifier, where when received by a last hop router associated with the one or more legs of the multicast distribution tree, the last hop router redirects the probe data packet to a CPU of the last hop router configured to generate performance statistics. The source router may receive from the last hop router, the performance statistics.

公开(公告)号：US12301404B2

公开(公告)日：2025-05-13

申请号：US18065221

申请日：2022-12-13

Applicant: Cisco Technology, Inc.

Inventor： Mankamana Mishra Prasad ,  Nitin Kumar ,  Frank Brockners ,  Carlos M. Pignataro ,  Rakesh Gandhi

IPC: H04L45/16 ,  H04L41/0631 ,  H04L43/12

Abstract: A method is performed by a network controller that is configured to control routers configured to forward a multicast flow downstream from a first hop router that is a root of a multicast tree formed by the routers to last hop routers that terminate branches of the multicast tree, respectively. The method includes collecting operational configuration information from the routers and constructing a topological view of the multicast tree based on the operational configuration information; causing the routers to forward multicast probes downstream from the first hop router along all of the branches toward the last hop routers to trace the multicast tree; receiving, from particular ones of the last hop routers that received the multicast probes, indications that the multicast probes were received; and detecting failures in the multicast tree based on the indications and the topological view.

公开(公告)号：US12184534B2

公开(公告)日：2024-12-31

申请号：US18504840

申请日：2023-11-08

Applicant: Cisco Technology, Inc.

Inventor： Jaganbabu Rajamanickam ,  Madhan Sankaranarayanan ,  Nagendra Kumar Nainar ,  Rakesh Gandhi

IPC: H04L45/02 ,  H04L45/00 ,  H04L45/28

Abstract: In one aspect, a method for monitoring a Fast Re-Route (FRR) path between a source node (Node-S) and a destination node (Node-E) in a network, includes generating a discovery-probe at the source node (Node-S) to detect at least one node with an FRR indicator along the FRR path that includes a plurality of next available nodes. The method also includes upon the discovery probe reaching a first node with the FRR indicator, generating a primary probe configured to detect a primary path and a repair probe configured to detect a repair path. The method also includes in response to receiving the primary probe via the primary path and the repair probe via the repair path at the destination node, sending the primary probe and the repair probe back to the source node to monitor the FRR path between the source node and the destination node.

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：US20240195725A1

公开(公告)日：2024-06-13

申请号：US18360700

申请日：2023-07-27

Applicant: Cisco Technology, Inc.

Inventor： Jaganbabu Rajamanickam ,  Rakesh Gandhi ,  Nagendra Kumar Nainar ,  Madhan Sankaranarayanan

IPC: H04L43/12 ,  H04L45/00 ,  H04L45/50

CPC classification number: H04L43/12 ,  H04L45/20 ,  H04L45/50

Abstract: Systems and methods for validating a hardware path capability are provided. The method includes generating, at an ingress node of a network, an operations, administration and maintenance (OAM) probe packet having an OAM bit set associated with validating the hardware path capability, wherein the OAM probe packet comprises a plurality of features; indicating, by each respective intermediate node of a plurality of intermediate nodes in the network along a network path and as instructed by the OAM bit set, whether the respective intermediate node can support the respective feature of the plurality of features; generating, at an egress node associated with the network path, a report regarding whether the plurality of intermediate nodes can support each respective feature of the plurality of features within the OAM probe packet; and determining, based on the report, whether to enable customer traffic implementing the plurality of features along the network path.

公开(公告)号：US20240129223A1

公开(公告)日：2024-04-18

申请号：US18391612

申请日：2023-12-20

Applicant: Cisco Technology, Inc.

Inventor： Amila Pradeep Kumara Tharaperiya Gamage ,  Rakesh Gandhi ,  Zafar Ali

IPC: H04L43/50 ,  H04L45/02 ,  H04L45/24

CPC classification number: H04L43/50 ,  H04L45/02 ,  H04L45/24

Abstract: Systems, methods, and computer-readable media are disclosed for validating multiple paths used for routing network traffic in a network. In one aspect, a network controller can identify one or more intermediate nodes on each of multiple paths in a network, wherein the multiple paths begin at a first network node and end at a last network node. The network controller can further generate a data packet with a label at the first network node, forward the test data packet from the first network node, along each of the one or more intermediate nodes, to the last network node, and perform a data plane validation process for validating packet forwarding from the first network node to the last network node based on the label(s) by determining if a number of the multiple paths equals to a number of packets received at the last network node.