Patents by Inventor Clarence Filsfils

Clarence Filsfils has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230043743
    Abstract: Various systems and methods for using strict path forwarding. For example, one method involves receiving an advertisement at a node. The advertisement includes a segment identifier (SID). In response to receiving the advertisement, the node determines whether the SID is a strict SID or not. If the SID is a strict SID, the node generates information, such as forwarding information that indicates how to forward packets along a strict shortest path corresponding to the strict SID.
    Type: Application
    Filed: October 20, 2022
    Publication date: February 9, 2023
    Inventors: Peter Psenak, Robert Hanzl, Clarence Filsfils, Ketan Jivan Talaulikar
  • Publication number: 20230031423
    Abstract: Techniques are described for utilizing entropy labels of a Multiprotocol Label Switching (MPLS) label stack for performing monitoring operations (e.g., telemetry, performance measurement, OAM, etc.) without altering the MPLS label stack and/or packet path (e.g., ECMP path). The techniques may include determining, by a node of a network, to perform a monitoring operation associated with traffic that is to be sent along a path through the network. In some examples, the node may receive a packet that is to be sent along the path and encapsulate the packet with an MPLS header. The MPLS header may include an entropy label, entropy label indicator, or other label that is capable of carrying a flag indicating the monitoring operation to be performed. The flag may be carried in a TTL field or traffic class field of the label such that the MPLS label stack is not altered to trigger the monitoring operation.
    Type: Application
    Filed: December 30, 2021
    Publication date: February 2, 2023
    Inventors: Rakesh Gandhi, Clarence Filsfils
  • Publication number: 20230026874
    Abstract: In one embodiment, a segment routing and tunnel exchange provides packet forwarding efficiencies in a network, including providing an exchange between a segment routing domain and a packet tunnel domain. One application includes the segment routing and tunnel exchange interfacing segment routing packet forwarding (e.g., in a Evolved Packet Core (EPC) and/or 5-G user plane) and packet tunnel forwarding in access networks (e.g., replacing a portion of a tunnel between an access node and a user plane function for accessing a corresponding data network). In one embodiment, a network provides mobility services using a segment routing data plane that spans segment routing and tunnel exchange(s) and segment routing-enabled user plane functions. One embodiment uses the segment routing data plane without any modification to a (radio) access network (R)AN (e.g., Evolved NodeB, Next Generation NodeB) nor to user equipment (e.g., any end user device).
    Type: Application
    Filed: October 4, 2022
    Publication date: January 26, 2023
    Inventors: Pablo Camarillo Garvia, Hendrikus G.P. Bosch, Clarence Filsfils
  • Patent number: 11563683
    Abstract: In one embodiment, a method includes receiving a packet comprising a destination address in a destination address field of the packet, where the destination address including at least a first global identifier and a second global identifier, determining that the first global identifier corresponds to the first network apparatus, determining that a local identifier in the destination address is associated with the first global identifier, identifying one or more instructions associated with the local identifier, performing one or more functions instructed by the one or more instructions, updating the destination address in the destination field of the packet to an updated destination address, determining a forwarding rule associated with the packet, and forwarding the packet with the updated destination address based on the forwarding rule.
    Type: Grant
    Filed: October 4, 2021
    Date of Patent: January 24, 2023
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Clarence Filsfils, Jisu Bhattacharya, Zafar Ali, Syed Kamran Raza
  • Publication number: 20230021278
    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.
    Type: Application
    Filed: May 10, 2022
    Publication date: January 19, 2023
    Inventors: Clarence Filsfils, Zafar Ali, Francois Clad, Bertrand Herbert Guy Duvivier, Mikhail Koldychev, Rakesh Gandhi, Sagar Soni
  • Patent number: 11558288
    Abstract: The present technology provides a system and method for implementing targeted collection of in-situ Operation, Administration and Maintenance data from select nodes in a Segment Routing Domain. The selection is programmable and is implemented by setting an iOAM bit in the function arguments field of a Segment Identifier. In this way only the nodes associated with local Segment Identifiers (Function field of a Segment Identifier) with an iOAM argument bit are directed to generate iOAM data. The iOAM data generated by target nodes may be stored in TLV field of the segment routing header. The Segment Routing packet is then decapsulated at a Segment Routing egress node and the Header information with the collected iOAM data is sent to a controller entity for further processing, analysis and/or monitoring.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: January 17, 2023
    Assignee: Cisco Technology, Inc.
    Inventors: Clarence Filsfils, Zafar Ali, Frank Brockners
  • Publication number: 20230009602
    Abstract: Disclosed are systems, apparatuses, methods, and computer-readable media to measure performance of distinct paths of a network. A method includes determining a collection of hashes of a network based on a network probe event, each hash in the collection of hashes corresponding to a distinct path from a first edge device to a second edge device through the network; transmitting a collection of probes from the first edge device in the network, wherein each probe in the collection of probes is assigned a hash selected from the collection of hashes; receiving probes from the collection of probes at the second edge device; and determining a network performance of each distinct path through the network.
    Type: Application
    Filed: April 22, 2022
    Publication date: January 12, 2023
    Inventors: Clarence Filsfils, Pablo Camarillo Garvia, Ahmed Mohamed Ahmed Abdelsalam, Karen Michele Cadora
  • Publication number: 20220417137
    Abstract: In one embodiment, a service chain data packet is instrumented as it is communicated among network nodes in a network providing service-level and/or networking operations visibility. The service chain data packet includes a particular header identifying a service group defining one or more service functions, and is a data packet and not a probe packet. A network node adds networking and/or service-layer operations data to the particular service chain data packet, such as, but not limited to, in the particular header. Such networking operations data includes a performance metric or attribute related to the transport of the particular service chain packet in the network. Such service-layer operations data includes a performance metric or attribute related to the service-level processing of the particular service chain data packet in the network.
    Type: Application
    Filed: July 8, 2022
    Publication date: December 29, 2022
    Inventors: Clarence Filsfils, Zafar Ali, Syed Kamran Raza, Ahmed Refaat Bashandy, Nagendra Kumar Nainar, Carlos M. Pignataro, Jaganbabu Rajamanickam, Rakesh Gandhi, Bhupendra Yadav, Faisal Iqbal
  • Patent number: 11533258
    Abstract: Techniques for in-situ passive performance measurement are described. In one embodiment, a method includes receiving a data packet at a first network element, determining whether measurement information is to be collected for the data packet, providing one or more measurement fields for the data packet based on a determination that measurement information is to be collected for the data packet in which at least one measurement field identifies a measurement type, and forwarding the data packet to a second network element. The method further includes determining, by the second network element, the measurement type for the data packet, and performing one or more actions based on the measurement type.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: December 20, 2022
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Rakesh Gandhi, Clarence Filsfils, Sagar Soni, Patrick Khordoc
  • Publication number: 20220400048
    Abstract: The present technology is directed to signaling unreachability of a network device, more specifically, a prefix of the network device in network that utilizes route summarization. A pulse trigger agent can detect an unreachability of at least one Provider Edge (PE) device in a network domain of a network and determine that a route summarization is being used within the network where the unreachability of the at least one PE device is hidden by the route summarization. A pulse distribution agent can transmit a failure message informing other PE devices of the unreachability of the at least one PE device.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 15, 2022
    Inventors: Peter Psenak, Lester C. Ginsberg, Ketan Jivan Talaulikar, Clarence Filsfils, Francois Clad, Stephane Litkowski
  • Publication number: 20220394109
    Abstract: In one embodiment, a method includes identifying, by a network component, a first segment identifier (SID) within a SID list. The first SID includes a first SID block and a first micro SID (uSID). The method also includes initializing, by the network component, a packing list of a uSID carrier with the first uSID of the first SID and initializing, by the network component, a packing block of the uSID carrier with the first SID block of the first SID. The method further includes initializing, by the network component, a remaining packing capacity of the packing list with a carrier capacity of the first SID and initializing, by the network component, an empty compressed SID list.
    Type: Application
    Filed: August 16, 2022
    Publication date: December 8, 2022
    Inventors: Clarence Filsfils, Francois Clad, Pablo Camarillo Garvia, Siva Sivabalan, Syed Kamran Raza
  • Publication number: 20220385573
    Abstract: The present technology pertains to a group-based network policy using Segment Routing over an IPv6 dataplane (SRv6). After a source application sends a packet, an ingress node can receive the packet, and if the source node is capable, it can identify an application policy and apply it. The ingress node indicates that the policy has been applied by including policy bits in the packet encapsulation. When the packet is received by the egress node, it can determine whether the policy was already applied, and if so, the packet is forward to the destination application. If the egress node determines that the policy has not be applied the destination application can apply the policy. Both the ingress node and egress nodes can learn of source application groups, destination application groups, and applicable policies through communication with aspects of the segment routing fabric.
    Type: Application
    Filed: July 14, 2022
    Publication date: December 1, 2022
    Inventors: Clarence Filsfils, Ahmed Mohamed Ahmed Abdelsalam, Francois Clad, Pablo Camarillo Garvia, Kiran Sasidharan Pillai
  • Publication number: 20220376987
    Abstract: An apparatus and method for path creation element driven dynamic setup of forwarding adjacencies and explicit path. In one embodiment of the method, a node receives an instruction to create a tunnel between the node and another node. The node creates or initiates the creation of the tunnel in response to receiving the instruction, wherein the tunnel comprises a plurality of nodes in data communication between the node and the other node. The node maps a first identifier (ID) to information relating to the tunnel. The node advertises the first ID to other nodes in a network of nodes.
    Type: Application
    Filed: July 27, 2022
    Publication date: November 24, 2022
    Inventors: Stefano B. Previdi, Clarence Filsfils
  • Patent number: 11489756
    Abstract: Various systems and methods for using strict path forwarding. For example, one method involves receiving an advertisement at a node. The advertisement includes a segment identifier (SID). In response to receiving the advertisement, the node determines whether the SID is a strict SID or not. If the SID is a strict SID, the node generates information, such as forwarding information that indicates how to forward packets along a strict shortest path corresponding to the strict SID.
    Type: Grant
    Filed: April 28, 2022
    Date of Patent: November 1, 2022
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Peter Psenak, Robert Hanzl, Clarence Filsfils, Ketan Jivan Talaulikar
  • Patent number: 11483230
    Abstract: Aspects described herein include a method for use with a software-defined network controller, as well as an associated computer program product and system. The method comprises assigning a segment identifier to an endpoint node within a destination domain of a plurality of domains. Adjacent domains of the plurality of domains are connected via a respective set of two or more domain border routers. The method further comprises assigning a respective segment identifier to each domain. Each domain border router advertises the segment identifiers of the respective two adjacent domains. The method further comprises, responsive to a request from a headend node within a source domain of the plurality of domains, computing a path from the headend node to the endpoint node. The path includes (i) the segment identifiers of any domains between the headend node and the endpoint node, and (ii) the segment identifier of the endpoint node.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: October 25, 2022
    Assignee: Cisco Technology, Inc.
    Inventors: Clarence Filsfils, Francois Clad, Muthurajah Sivabalan, Zafar Ali
  • Publication number: 20220329518
    Abstract: A network node receives a data packet. In response to receiving the data packet, the network node performs a lookup on a label stack of the data packet to determine a next hop for the data packet. The network node scans the label stack to identify a Structured Entropy Label (SEL). The SEL includes a Path Tracing Indicator (PTI). The network node computes Midpoint Compressed Data (MCD) as a result of the PTI being set to a pre-defined value. The network node records the MCD in a MCD stack of the data packet by shifting the MCD stack and stamping the MCD on top of the MCD stack. The network node transmits the data packet to the next hop with the recorded MCD stack. The network sink node encapsulates the received data packet to generate an encapsulated data packet and transmits the data packet.
    Type: Application
    Filed: November 11, 2021
    Publication date: October 13, 2022
    Inventors: Clarence Filsfils, Ahmed Mohamed Ahmed Abdelsalam, Rakesh Gandhi, Pablo Camarillo Garvia
  • Patent number: 11463561
    Abstract: In one embodiment, new Segment Routing capabilities are used in the steering of packets through Segment Routing nodes in a network. A Segment List includes a set of one or more Segment List (SL) Groups, each of which identifies one or more Segments contiguously or non-contiguously stored in the Segment List (or stored across multiple Segment Lists) of a Segment Routing packet. Each SL Group typically includes one Segment that is encoded as a Segment Identifier, and may include Segments that are Extended Values. The steering order of SL Groups is not required to be the same order as they are listed in the Segment List, as the value of Segments Left may be increased, remain the same, or decreased (possibly to skip a next SL Group) and possibly based on the result of an evaluation of a conditional expression.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: October 4, 2022
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Clarence Filsfils, Francois Clad, Pablo Camarillo Garvia, David Delano Ward
  • Publication number: 20220303366
    Abstract: In one embodiment, Ethernet Virtual Private Network (EVPN) is implemented using Internet Protocol Version 6 (IPv6) Segment Routing (SRv6) underlay network and SRv6-enhanced Border Gateway Protocol (BGP) signaling. A particular route associated with a particular Internet Protocol Version 6 (IPv6) Segment Routing (SRv6) Segment Identifier (SID) is advertised in a particular route advertisement message of a routing protocol (e.g., BGP). The SID includes encoding representing a particular Ethernet Virtual Private Network (EVPN) Layer 2 (L2) flooding Segment Routing end function of the particular router and a particular Ethernet Segment Identifier (ESI), with the particular SID including a routable prefix to the particular router. The particular router receives a particular packet including the particular SID; and in response, the particular router performs the particular EVPN end function on the particular packet.
    Type: Application
    Filed: June 9, 2022
    Publication date: September 22, 2022
    Inventors: Patrice Brissette, Clarence Filsfils, Darren Dukes, Gaurav Dawra, Francois Clad, Pablo Camarillo Garvia
  • Publication number: 20220294729
    Abstract: In one embodiment, a method includes a method includes receiving, by a headend node, network traffic. The method also includes determining, by the headend node, that the network traffic matches a service route. The method further includes steering, by the headend node, the network traffic into an SR-TE policy. The SR-TE policy is associated with the service route and includes a security level constraint.
    Type: Application
    Filed: June 2, 2022
    Publication date: September 15, 2022
    Inventors: Francois Clad, David Delano Ward, Clarence Filsfils
  • Patent number: 11445048
    Abstract: In one embodiment, a method includes identifying, by a network component, a first segment identifier (SID) within a SID list. The first SID includes a first SID block and a first micro SID (uSID). The method also includes initializing, by the network component, a packing list of a uSID carrier with the first uSID of the first SID and initializing, by the network component, a packing block of the uSID carrier with the first SID block of the first SID. The method further includes initializing, by the network component, a remaining packing capacity of the packing list with a carrier capacity of the first SID and initializing, by the network component, an empty compressed SID list.
    Type: Grant
    Filed: August 11, 2020
    Date of Patent: September 13, 2022
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Clarence Filsfils, Francois Clad, Pablo Camarillo Garvia, Siva Sivabalan, Syed Kamran Raza