Patents by Inventor Kapil Arora

Kapil Arora 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).

  • Patent number: 11876695
    Abstract: Echo or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node and an egress node, by: (a) obtaining a return label stack to reach the ingress node from either (A) the egress node, or (B) a transit node in the path; (b) obtaining a label stack to reach, from the ingress node, either (A) the egress node, or (B) the transit node; (c) generating a request message including the return label stack; and (d) sending the request message towards either (A) the egress node, or (B) the transit node using the label stack.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: January 16, 2024
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Shraddha Hegde
  • Patent number: 11765077
    Abstract: Ping or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node in a first autonomous system (AS) and an egress node in an AS other than the first AS, using a reverse path label pair including (1) a node segment identifier (SID) corresponding to an AS Border Router (ASBR) of the second AS (second ASBR), and (2) an egress peer engineering (EPE) SID corresponding to a segment between the second ASBR to an ASBR of the first AS (first ASBR). Responsive to receiving a ping or traceroute request by a router in the second AS, the router generates a ping or traceroute reply including the reverse path label pair. The ping or traceroute reply is forwarded to the second ASBR using the node SID of the reverse path label pair. The ping or traceroute reply is then forwarded from the second ASBR to the first ASBR using the EPE SID of the reverse path label pair.
    Type: Grant
    Filed: April 12, 2022
    Date of Patent: September 19, 2023
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Samson P Ninan, Shraddha Hegde
  • Patent number: 11522794
    Abstract: An improved traceroute mechanism for use in a label-switched path (LSP) is provided by (a) receiving, by a device in the LSP, an echo request message, wherein the echo request includes a label stack having a least one label, and wherein each of the at least one label has an associated time-to-live (TTL) value; (b) responsive to receiving the echo request, determining by the device, whether or not the device is a penultimate hop popping (PHP) device for the outermost label of the label stack; and (c) responsive to determining that the device is the PHP device for the outermost label of the label stack, (1) generating an echo reply message corresponding to the echo request message, wherein the echo reply message is encoded to indicate that the device is the PHP device for the outermost label of the label stack, and (2) sending the echo reply message back towards a source of the echo request message.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: December 6, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Shraddha Hegde
  • Patent number: 11381501
    Abstract: A device may store first information regarding a first pseudowire connection with a first device, wherein the first pseudowire connection provides access to an Ethernet virtual private network (EVPN) to communicate with a host device. The device may store second information regarding a second pseudowire connection with a second device, wherein the second pseudowire connection provides access to the EVPN to communicate with the host device. The device may receive a message that includes a configuration identifier and identify the configuration identifier. The device may change a first characteristic of the first pseudowire connection based on the configuration identifier. The device may change a second characteristic of the second pseudowire connection based on the configuration identifier. The device may receive data from the host device based on changing the first characteristic of the first pseudowire connection and changing the second characteristic of the second pseudowire connection.
    Type: Grant
    Filed: August 3, 2020
    Date of Patent: July 5, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Vikram Nagarajan, Robert W. Kebler, Kapil Arora, Himanshu Agarwal, Soumyodeep Joarder
  • Patent number: 11349749
    Abstract: Techniques are described for facilitating node protection for Broadcast, unknown Unicast, and Multicast (BUM) traffic for a multi-homed node failure. For example, each VTEP (e.g., PE device) may advertise a protected VTEP address that indicates an IP address of a remote PE device that is to be protected in the event of a node failure. In the event a multi-homed PE device fails, the ingress PE device sends a BUM packet including the protected VTEP address for the failed node. When an egress PE device receives the BUM packet, the egress PE device determines whether the BUM packet includes the protected VTEP address and whether the egress PE device is operating as a backup designated forwarder (DF). If the BUM packet includes the protected VTEP address and the egress PE device is a backup DF, the egress PE device forwards the BUM traffic to the ESI.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: May 31, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Vikram Nagarajan, Kapil Arora, Robert W. Kebler, Princy T. Elizabeth, Ramesh Kandula, Soumyodeep Joarder
  • Patent number: 11336569
    Abstract: Ping or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node in a first autonomous system (AS) and an egress node in an AS other than the first AS, using a reverse path label pair including (1) a node segment identifier (SID) corresponding to an AS Border Router (ASBR) of the second AS (second ASBR), and (2) an egress peer engineering (EPE) SID corresponding to a segment between the second ASBR to an ASBR of the first AS (first ASBR). Responsive to receiving a ping or traceroute request by a router in the second AS, the router generates a ping or traceroute reply including the reverse path label pair. The ping or traceroute reply is forwarded to the second ASBR using the node SID of the reverse path label pair. The ping or traceroute reply is then forwarded from the second ASBR to the first ASBR using the EPE SID of the reverse path label pair.
    Type: Grant
    Filed: February 11, 2020
    Date of Patent: May 17, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Samson P. Ninan, Shraddha Hegde
  • Patent number: 11303549
    Abstract: Techniques are described for selectively pinging certain devices along a segment routing label switched path (LSP) to detect failures in the segment routing LSP. For example, an ingress device comprises one or more processors operably coupled to a memory that are configured to: in response to a request to verify connectivity of a segment routing LSP, configure a FEC stack specifying a stack of segment routing labels for the segment routing LSP; for each of the one or more devices identified from the FEC stack: generate a respective MPLS connectivity request packet for a respective device identified from an outermost FEC of the FEC stack; send the MPLS connectivity request packet to the respective device; receive an MPLS connectivity response packet that verifies connectivity of the respective device; and in response, update the FEC stack by removing the outermost FEC of the FEC stack that identifies the respective device.
    Type: Grant
    Filed: July 13, 2020
    Date of Patent: April 12, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Samson P. Ninan, Shraddha Hegde
  • Patent number: 11296908
    Abstract: Techniques are disclosed for an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) network with service interface-aware forwarding. In one example, a first network device signals to a second network device, using EVPN route advertisements, a multi-service service tunnel to transport network packets for a plurality of services. The services are identifiable by virtual local area network (VLAN) identifiers in the packets. The first network device is configured with a single transport interface for the service tunnel and the single transport interface is configured with respective service interfaces for the services. The first network device detects failure of a failed service interface of the service interfaces and outputs, in response to the failure, an EVPN route withdrawal message for the service tunnel that identifies the service corresponding to the failed service interface.
    Type: Grant
    Filed: June 22, 2020
    Date of Patent: April 5, 2022
    Assignee: Juniper Networks, Inc.
    Inventors: Wen Lin, Pankaj Kumar Gupta, Babu Singarayan, Sharmila Koppula, Manish Gupta, Kapil Arora
  • Publication number: 20210367867
    Abstract: Techniques are described for selectively pinging certain devices along a segment routing label switched path (LSP) to detect failures in the segment routing LSP. For example, an ingress device comprises one or more processors operably coupled to a memory that are configured to: in response to a request to verify connectivity of a segment routing LSP, configure a FEC stack specifying a stack of segment routing labels for the segment routing LSP; for each of the one or more devices identified from the FEC stack: generate a respective MPLS connectivity request packet for a respective device identified from an outermost FEC of the FEC stack; send the MPLS connectivity request packet to the respective device; receive an MPLS connectivity response packet that verifies connectivity of the respective device; and in response, update the FEC stack by removing the outermost FEC of the FEC stack that identifies the respective device.
    Type: Application
    Filed: July 13, 2020
    Publication date: November 25, 2021
    Inventors: Kapil Arora, Samson P. Ninan, Shraddha Hegde
  • Publication number: 20210250283
    Abstract: Ping or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node in a first autonomous system (AS) and an egress node in an AS other than the first AS, using a reverse path label pair including (1) a node segment identifier (SID) corresponding to an AS Border Router (ASBR) of the second AS (second ASBR), and (2) an egress peer engineering (EPE) SID corresponding to a segment between the second ASBR to an ASBR of the first AS (first ASBR). Responsive to receiving a ping or traceroute request by a router in the second AS, the router generates a ping or traceroute reply including the reverse path label pair. The ping or traceroute reply is forwarded to the second ASBR using the node SID of the reverse path label pair. The ping or traceroute reply is then forwarded from the second ASBR to the first ASBR using the EPE SID of the reverse path label pair.
    Type: Application
    Filed: February 11, 2020
    Publication date: August 12, 2021
    Inventors: Kapil Arora, Shraddha Hegde, Samson P. Ninan
  • Publication number: 20210250270
    Abstract: Echo or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node and an egress node, by: (a) obtaining a return label stack to reach the ingress node from either (A) the egress node, or (B) a transit node in the path; (b) obtaining a label stack to reach, from the ingress node, either (A) the egress node, or (B) the transit node; (c) generating a request message including the return label stack; and (d) sending the request message towards either (A) the egress node, or (B) the transit node using the label stack.
    Type: Application
    Filed: April 29, 2021
    Publication date: August 12, 2021
    Inventors: Kapil Arora, Shraddha Hegde
  • Patent number: 11025522
    Abstract: Echo or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node and an egress node, by: (a) obtaining a return label stack to reach the ingress node from either (A) the egress node, or (B) a transit node in the path; (b) obtaining a label stack to reach, from the ingress node, either (A) the egress node, or (B) the transit node; (c) generating a request message including the return label stack; and (d) sending the request message towards either (A) the egress node, or (B) the transit node using the label stack.
    Type: Grant
    Filed: May 4, 2019
    Date of Patent: June 1, 2021
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Shraddha Hegde
  • Publication number: 20210111995
    Abstract: An improved traceroute mechanism for use in a label-switched path (LSP) is provided by (a) receiving, by a device in the LSP, an echo request message, wherein the echo request includes a label stack having a least one label, and wherein each of the at least one label has an associated time-to-live (TTL) value; (b) responsive to receiving the echo request, determining by the device, whether or not the device is a penultimate hop popping (PHP) device for the outermost label of the label stack; and (c) responsive to determining that the device is the PHP device for the outermost label of the label stack, (1) generating an echo reply message corresponding to the echo request message, wherein the echo reply message is encoded to indicate that the device is the PHP device for the outermost label of the label stack, and (2) sending the echo reply message back towards a source of the echo request message.
    Type: Application
    Filed: December 18, 2020
    Publication date: April 15, 2021
    Inventors: Kapil Arora, Shraddha Hegde
  • Patent number: 10924332
    Abstract: Techniques are described for facilitating node protection for Broadcast, unknown Unicast, and Multicast (BUM) traffic for a multi-homed node failure. For example, multi-homed provider edge (PE) devices each advertise egress node protection labels to an ingress PE device. In the event one of the multi-homed PE devices fails, the ingress PE device sends a BUM packet including the egress node protection labels for the failed node. When an egress PE device receives the BUM packet, the egress PE device determines whether the BUM packet includes the egress node protection labels and whether the egress PE device is operating as a backup designated forwarder (DF) on an Ethernet segment identifier (ESI) for which the failed node was the DF. If the BUM packet includes the egress node protection labels and the egress PE device is operating as a backup DF, the egress PE device forwards the BUM traffic to the ESI.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: February 16, 2021
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Vikram Nagarajan, Robert W. Kebler, Princy T. Elizabeth, Ramesh Kandula, Soumyodeep Joarder
  • Patent number: 10917337
    Abstract: An improved traceroute mechanism for use in a label-switched path (LSP) is provided by (a) receiving, by a device in the LSP, an echo request message, wherein the echo request includes a label stack having a least one label, and wherein each of the at least one label has an associated time-to-live (TTL) value; (b) responsive to receiving the echo request, determining by the device, whether or not the device is a penultimate hop popping (PHP) device for the outermost label of the label stack; and (c) responsive to determining that the device is the PHP device for the outermost label of the label stack, (1) generating an echo reply message corresponding to the echo request message, wherein the echo reply message is encoded to indicate that the device is the PHP device for the outermost label of the label stack, and (2) sending the echo reply message back towards a source of the echo request message.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: February 9, 2021
    Assignee: Juniper Networks, Inc.
    Inventors: Kapil Arora, Shraddha Hegde
  • Publication number: 20200366602
    Abstract: A device may store first information regarding a first pseudowire connection with a first device, wherein the first pseudowire connection provides access to an Ethernet virtual private network (EVPN) to communicate with a host device. The device may store second information regarding a second pseudowire connection with a second device, wherein the second pseudowire connection provides access to the EVPN to communicate with the host device. The device may receive a message that includes a configuration identifier and identify the configuration identifier. The device may change a first characteristic of the first pseudowire connection based on the configuration identifier. The device may change a second characteristic of the second pseudowire connection based on the configuration identifier. The device may receive data from the host device based on changing the first characteristic of the first pseudowire connection and changing the second characteristic of the second pseudowire connection.
    Type: Application
    Filed: August 3, 2020
    Publication date: November 19, 2020
    Inventors: Vikram NAGARAJAN, Robert W. Kebler, Kapil Arora, Himanshu Agarwal, Soumyodeep Joarder
  • Publication number: 20200351188
    Abstract: Echo or traceroute functionality is supported in a path spanning multiple autonomous systems (ASes) having segment routing (SR) enabled, the path including an ingress node and an egress node, by: (a) obtaining a return label stack to reach the ingress node from either (A) the egress node, or (B) a transit node in the path; (b) obtaining a label stack to reach, from the ingress node, either (A) the egress node, or (B) the transit node; (c) generating a request message including the return label stack; and (d) sending the request message towards either (A) the egress node, or (B) the transit node using the label stack.
    Type: Application
    Filed: May 4, 2019
    Publication date: November 5, 2020
    Inventors: Kapil Arora, Shraddha Hegde
  • Publication number: 20200322183
    Abstract: Techniques are disclosed for an Ethernet Virtual Private Network (EVPN) Virtual Private Wire Service (VPWS) network with service interface-aware forwarding. In one example, a first network device signals to a second network device, using EVPN route advertisements, a multi-service service tunnel to transport network packets for a plurality of services. The services are identifiable by virtual local area network (VLAN) identifiers in the packets. The first network device is configured with a single transport interface for the service tunnel and the single transport interface is configured with respective service interfaces for the services. The first network device detects failure of a failed service interface of the service interfaces and outputs, in response to the failure, an EVPN route withdrawal message for the service tunnel that identifies the service corresponding to the failed service interface.
    Type: Application
    Filed: June 22, 2020
    Publication date: October 8, 2020
    Inventors: Wen Lin, Pankaj Kumar Gupta, Babu Singarayan, Sharmila Koppula, Manish Gupta, Kapil Arora
  • Patent number: 10771383
    Abstract: A device may store first information regarding a first pseudowire connection with a first device, wherein the first pseudowire connection provides access to an Ethernet virtual private network (EVPN) to communicate with a host device. The device may store second information regarding a second pseudowire connection with a second device, wherein the second pseudowire connection provides access to the EVPN to communicate with the host device. The device may receive a message that includes a configuration identifier and identify the configuration identifier. The device may change a first characteristic of the first pseudowire connection based on the configuration identifier. The device may change a second characteristic of the second pseudowire connection based on the configuration identifier. The device may receive data from the host device based on changing the first characteristic of the first pseudowire connection and changing the second characteristic of the second pseudowire connection.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: September 8, 2020
    Assignee: Juniper Networks, Inc.
    Inventors: Vikram Nagarajan, Robert W. Kebler, Kapil Arora, Himanshu Agarwal, Soumyodeep Joarder
  • Patent number: 10771317
    Abstract: A first network device permits a bidirectional forwarding detection (BFD) session with a second network device. The first network device is a designated forwarder for a third network device, a first link is provided between the first network device and the third network device, the second network device is a backup designated forwarder for the third network device, a second link is provided between the second network device and the third network device. The first network device detects a link failure associated with the first link between the first network device and the third network device, and provides, via the BFD session, a BFD message to the second network device. The BFD message includes an indication of the link failure, and the BFD message is to cause the second network device to be a new designated forwarder for the third network device.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: September 8, 2020
    Assignee: Juniper Networks, Inc.
    Inventors: Soumyodeep Joarder, Kapil Arora, Sunil Kumar Malali, Vikram Nagarajan