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: 8238230
    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: February 3, 2010
    Date of Patent: August 7, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: Kaushik Das, Rajagopalan Sivaramakrishnan, Sameer Seth, Sriram Raghunathan
  • Publication number: 20110188387
    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: February 3, 2010
    Publication date: August 4, 2011
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Kaushik Das, Rajagopalan Sivaramakrishnan, Sameer Seth, Sriram Raghunathan
  • Publication number: 20110013508
    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: Application
    Filed: September 23, 2010
    Publication date: January 20, 2011
    Applicant: Juniper Networks, Inc.
    Inventors: Raj Tuplur, Bharani Chadalavada, Manoj Apte, Rajagopalan Sivaramakrishnan, Sriram Raghunathan, Umesh Krishnaswamy
  • Patent number: 7804769
    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: December 1, 2005
    Date of Patent: September 28, 2010
    Assignee: Juniper Networks, Inc.
    Inventors: Raj Tuplur, Bharani Chadalavada, Manoj Apte, Rajagopalan Sivaramakrishnan, Sriram Raghunathan, Umesh Krishnaswamy
  • Patent number: 7739403
    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: October 3, 2003
    Date of Patent: June 15, 2010
    Assignee: Juniper Networks, Inc.
    Inventors: Raghunath Balakrishna, Shine-chu Wang, Umesh Krishnaswamy, Bharani Chadalavada, Sandeep Kumar, Raj Tuplur, Rajagopalan Sivaramakrishnan