Patents by Inventor Rajagopalan Sivaramakrishnan

Rajagopalan Sivaramakrishnan 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: 10534601
    Abstract: Techniques are disclosed for performing an In-Service Software Upgrade (“ISSU”) of a first packet forwarding component (PFC) of a virtual router configured to forward traffic flows for a plurality of session instances within a cloud-based data center. The techniques described herein may retain flow state information throughout the ISSU process without interrupting network traffic flow. In one example, a processor of a plurality of compute nodes within the data center receives a request to perform an ISSU of the first PFC. The processor spawns a second virtual routing agent and a second PFC. The second virtual routing agent synchronizes flow state information with a first virtual routing agent for the virtual router. After synchronizing the flow state information, the virtual router switches from forwarding traffic flows by the first PFC to forwarding traffic flows by the second PFC. The ISSU process deactivates the first virtual router and the first PFC.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: January 14, 2020
    Assignee: Juniper Networks, Inc.
    Inventors: Suresh Kumar Vinapamula Venkata, Rajagopalan Sivaramakrishnan, Sachin Bansal, Praveen K V, Hari Prasad Killi
  • Patent number: 10469312
    Abstract: In some embodiments, an apparatus includes a first controller configured to be operatively coupled within a network having a set of network nodes, a forwarding gateway and a configuration entity. The first controller is configured to manage session state and node state associated with the set of network nodes independent of the forwarding gateway. The first controller is configured to fail over to a second controller when the first controller fails, without the forwarding gateway failing over and without the configuration entity failing over.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: November 5, 2019
    Assignee: Juniper Networks, Inc.
    Inventors: Abhijit Choudhury, James Murphy, Pranay Pogde, Shine-Chu Wang, Rajagopalan Sivaramakrishnan, Raghavendra Mallya, Ileana J. Membreno, Sandip Shah, Yung-Ching Tseng
  • Patent number: 10382331
    Abstract: In one example, a server executes a virtual router configured to receive an inner packet output by a virtual machine associated with a virtual network. The virtual router is further configured to offload, to a physical network interface card of the server that executes the virtual router, segmentation of the inner packet into a plurality of outbound tunnel packets each having a tunnel header for output by the physical network interface card to a physical network underlying the virtual network.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: August 13, 2019
    Assignee: Juniper Networks, Inc.
    Inventor: Rajagopalan Sivaramakrishnan
  • Patent number: 9948579
    Abstract: In some examples, a computing device includes one or more processors configured to execute a plurality of virtual machines; and a network interface card (NIC) coupled to the one or more processors and configured to receive configuration data defining a plurality of receipt queues of the NIC and associated with respective virtual machines of the plurality of virtual machines. The NIC is further configured to assign, based on respective virtual machine identifiers of packets received by the NIC, the packets to the plurality of receipt queues associated with the respective virtual machines.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: April 17, 2018
    Assignee: Juniper Networks, Inc.
    Inventor: Rajagopalan Sivaramakrishnan
  • Patent number: 9942148
    Abstract: In general, techniques are described for enhancing operations of virtual networks. In some examples, a network system includes a plurality of servers interconnected by a switch fabric comprising a plurality of switches interconnected to form a physical network. Each of the servers comprises an operating environment executing one or more virtual machines in communication via one or more virtual networks. The servers comprise a set of virtual routers configured to extend the virtual networks to the operating environments of the virtual machines. A virtual router of the set of virtual routers is configured to aggregate a plurality of inbound tunnel packets according to a same virtual network identifier in order to generate an aggregate tunnel packet. The virtual router is further configured to route the aggregate tunnel packet to a host associated with a virtual network identified by the same virtual network identifier.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: April 10, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Rajagopalan Sivaramakrishnan, Anand H Krishnan
  • Patent number: 9906407
    Abstract: In some embodiments, an apparatus includes a first controller configured to be operatively coupled within a network having a set of network nodes, a forwarding gateway and a configuration entity. The first controller is configured to manage session state and node state associated with the set of network nodes independent of the forwarding gateway. The first controller is configured to fail over to a second controller when the first controller fails, without the forwarding gateway failing over and without the configuration entity failing over.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: February 27, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Abhijit Choudhury, James Murphy, Pranay Pogde, Shine-Chu Wang, Rajagopalan Sivaramakrishnan, Raghavendra Mallya, Ileana Membreno, Sandip Shah, Yung-Ching Tseng
  • Patent number: 9674088
    Abstract: In general, techniques are described for enhancing operations of virtual networks. In some examples, a network system includes a network interface card of a server configured to receive a tunnel packet associated with a virtual network. The tunnel packet comprises an outer header associated with the physical network, the outer header encapsulating an inner packet comprising an inner header associated with the virtual network and a payload. A first processing core of the server is configured to perform, based at least on one of the outer header and inner header of the tunnel packet, a first packet steering operation to identify the second processing core. The second processing core is configured to forward the inner packet to a virtual machine of the virtual machines.
    Type: Grant
    Filed: May 16, 2016
    Date of Patent: June 6, 2017
    Assignee: Juniper Networks, Inc.
    Inventors: Rajagopalan Sivaramakrishnan, Anand H. Krishnan
  • Patent number: 9641435
    Abstract: In one example, a server executes a virtual router configured to receive an inner packet output by a virtual machine associated with a virtual network. The virtual router is further configured to offload, to a physical network interface card of the server that executes the virtual router, segmentation of the inner packet into a plurality of outbound tunnel packets each having a tunnel header for output by the physical network interface card to a physical network underlying the virtual network.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: May 2, 2017
    Assignee: Juniper Neworks, Inc.
    Inventor: Rajagopalan Sivaramakrishnan
  • Patent number: 9571394
    Abstract: In general, techniques are described for enhancing operations of virtual networks. In some examples, a network system includes a plurality of servers interconnected by a switch fabric comprising a plurality of switches interconnected to form a physical network. Each of the servers comprises an operating environment executing one or more virtual machines in communication via one or more virtual networks. The servers comprise a set of virtual routers configured to extend the virtual networks to the operating environments of the virtual machines. A virtual router of the set of virtual routers is configured to aggregate a plurality of inbound tunnel packets according to a same virtual network identifier in order to generate an aggregate tunnel packet. The virtual router is further configured to route the aggregate tunnel packet to a host associated with a virtual network identified by the same virtual network identifier.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: February 14, 2017
    Assignee: Juniper Networks, Inc.
    Inventors: Rajagopalan Sivaramakrishnan, Anand H. Krishnan
  • Patent number: 9485138
    Abstract: In some embodiments, an apparatus includes a first controller configured to be operatively coupled within a network having a set of network nodes, a forwarding gateway and a configuration entity. The first controller is configured to manage session state and node state associated with the set of network nodes independent of the forwarding gateway. The first controller is configured to fail over to a second controller when the first controller fails, without the forwarding gateway failing over and without the configuration entity failing over.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: November 1, 2016
    Assignee: Juniper Networks, Inc.
    Inventors: Abhijit Choudhury, James Murphy, Pranay Pogde, Shine-Chu Wang, Rajagopalan Sivaramakrishnan, Raghavendra Mallya, Ileana Membreno, Sandip Shah, Yung-Ching Tseng
  • Patent number: 9479439
    Abstract: In some embodiments, an apparatus includes a first core device configured to be disposed within a network. The network has a set of access nodes and a second core device. The first core device is configured to receive a signal designating the first core device as a master device for a virtual group identifier such that the second core device is designated as a back-up device for that virtual group identifier.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: October 25, 2016
    Assignee: Juniper Networks, Inc.
    Inventors: Pranay Pogde, James Murphy, Abhijit Choudhury, Raghavendra Mallya, Sandeep Bajaj, Bharani Chadalavada, Rajagopalan Sivaramakrishnan
  • Patent number: 9473394
    Abstract: In general, techniques are described for enhancing operations of virtual networks. In some examples, a network system includes a server that executes a virtual router configured to receive, from a switch fabric, a tunnel packet for a virtual network of the virtual networks, wherein the tunnel packet comprises an outer header and an inner packet that defines a packet flow. The virtual router is also configured to determine, based at least on the outer header, that the packet is associated with a virtual network of the one or more virtual networks, determine a packet flow defined by the inner packet does not match any flow table entry of a flow table that identifies active flows only for virtual network and, in response, add a flow table entry for a reverse packet flow of the packet flow to the flow table.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: October 18, 2016
    Assignee: Juniper Networks, Inc.
    Inventors: Rajagopalan Sivaramakrishnan, Anand H. Krishnan
  • Patent number: 9356866
    Abstract: In general, techniques are described for enhancing operations of virtual networks. In some examples, a network system includes a network interface card of a server configured to receive a tunnel packet associated with a virtual network. The tunnel packet comprises an outer header associated with the physical network, the outer header encapsulating an inner packet comprising an inner header associated with the virtual network and a payload. A first processing core of the server is configured to perform, based at least on one of the outer header and inner header of the tunnel packet, a first packet steering operation to identify the second processing core. The second processing core is configured to forward the inner packet to a virtual machine of the virtual machines.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: May 31, 2016
    Assignee: Juniper Networks, Inc.
    Inventors: Rajagopalan Sivaramakrishnan, Anand H. Krishnan
  • Patent number: 9253123
    Abstract: In some embodiments, an apparatus includes a first core device configured to be disposed within a network. The network has a set of access nodes and a second core device. The first core device is configured to receive a signal designating the first core device as a master device for a virtual group identifier such that the second core device is designated as a back-up device for that virtual group identifier.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: February 2, 2016
    Assignee: Juniper Networks, Inc.
    Inventors: Pranay Podge, James Murphy, Abhijit Choudhury, Raghavendra Mallya, Sandeep Bajaj, Bharani Chadalavada, Rajagopalan Sivaramakrishnan
  • Patent number: 8971173
    Abstract: In some embodiments, an apparatus includes a first controller configured to be operatively coupled within a network having a set of network nodes, a forwarding gateway and a configuration entity. The first controller is configured to manage session state and node state associated with the set of network nodes independent of the forwarding gateway. The first controller is configured to fail over to a second controller when the first controller fails, without the forwarding gateway failing over and without the configuration entity failing over.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: March 3, 2015
    Assignee: Juniper Networks, Inc.
    Inventors: Abhijit Choudhury, James Murphy, Pranay Pogde, Shine-Chu Wang, Rajagopalan Sivaramakrishnan, Raghavendra Mallya, Ileana Membreno, Sandip Shah, Yung-Ching Tseng
  • Patent number: 8943490
    Abstract: In general, techniques are described for performing a controlled non-stop software upgrade (NSSU) of a network device. In some examples, a method includes receiving, by a first network device included in a virtual network device, a non-stop software upgrade (NSSU) request. The first network device is communicatively coupled to each of a computing device and a second network device. The method includes, in response to receiving the NSSU request, forwarding to the second network device, network packets that are received at the first network device and destined to the computing device. The method also includes sending a message to the computing device that instructs the computing device to stop sending network packets to the first network device. The method includes updating one or more software components within the first network device, after sending the message to the computing device and based at least in part on the NSSU request.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 27, 2015
    Assignee: Juniper Networks, Inc.
    Inventors: Amit Jain, Rajagopalan Sivaramakrishnan, Abhiman Yashpala Karkera, Siva Madasamy
  • Patent number: 8799511
    Abstract: Techniques are described for synchronizing state information between a plurality of control units. A router, for example, is described that includes a primary control unit and a standby control unit. The primary control unit maintains router resources to ensure operation of the router. To ensure operation, the primary control unit receives state information from the router resources and maintains the state information for consumers, i.e. router resources that require or “consume” state information. Prior to updating the consumers with the state information, the primary control unit synchronizes the state information with the standby control unit. In the event the primary control unit fails, the standby control unit assumes control of the router resources. Upon assuming control, the standby control unit resumes updating the consumers with state information without having to “relearn” state information, e.g., by way of power cycling the router resources to a known state.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: August 5, 2014
    Assignee: Juniper Networks, Inc.
    Inventors: Raghunath Balakrishna, Shine-chu Wang, Umesh Krishnaswamy, Bharani Chadalavada, Sandeep Kumar, Raj Tuplur, Rajagopalan Sivaramakrishnan
  • Patent number: 8498200
    Abstract: A system includes a first device connected to a second device The first device includes a second node connected to a first node and the second device via a link, and includes a backup second node connected to the first node and the second device via another link. The first node is configured to receive, via the link or the other link, a group of packets (i.e., “packets”), from the second device; display a first notification that the second node can be removed when the packets are received via only the other link; display a second notification indicating that the backup second node can be removed when the packets are received via only the link; and display a third notification indicating that neither the second node nor the backup second node can be removed when the packets are not received via only the link and via only the other link.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: July 30, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Kaushik Das, Rajagopalan Sivaramakrishnan, Sameer Seth, Sriram Raghunathan
  • Patent number: 8483048
    Abstract: State information is synchronized between a plurality of routing engines in a multi-chassis router according to a synchronization gradient. An example multi-chassis router is described that includes a primary routing engine and a standby routing engine in each chassis. According to the synchronization gradient, the primary routing engine of a control node updates state information on the standby routing engine of the control node prior to updating the primary routing engines of the other chassis. The primary routing engines of the other chassis update state information in respective standby routing engines prior to updating state information in consumers. If a primary routing engine fails, the corresponding standby routing engine assumes control of the primary routing engine's duties. Upon assuming control, a standby routing engine resumes updating state information without having to resend state information or interrupt packet forwarding.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: July 9, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Raj Tuplur, Bharani Chadalavada, Manoj Apte, Rajagopalan Sivaramakrishnan, Sriram Raghunathan, Umesh Krishnaswamy
  • Publication number: 20120218996
    Abstract: A system includes a first device connected to a second device The first device includes a second node connected to a first node and the second device via a link, and includes a backup second node connected to the first node and the second device via another link. The first node is configured to receive, via the link or the other link, a group of packets (i.e., “packets”), from the second device; display a first notification that the second node can be removed when the packets are received via only the other link; display a second notification indicating that the backup second node can be removed when the packets are received via only the link; and display a third notification indicating that neither the second node nor the backup second node can be removed when the packets are not received via only the link and via only the other link.
    Type: Application
    Filed: May 8, 2012
    Publication date: August 30, 2012
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Kaushik DAS, Rajagopalan SIVARAMAKRISHNAN, Sameer SETH, Sriram RAGHUNATHAN