Patents by Inventor Ramanarayanan Ramakrishnan

Ramanarayanan Ramakrishnan 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: 10148456
    Abstract: A method and apparatus for connecting multiple customer sites over a wide area network (WAN) using an overlay network is described. In one embodiment of the invention, each one of multiple customer edge (CE) routers establishes a Border Gateway Protocol (BGP) session with one or more BGP route reflectors and announces their private IP network prefixes and one or more transport IP addresses to reach that CE router. The BGP route reflector(s) reflect those IP network prefixes and the one or more transport IP addresses to reach that specific CE router to the other CE routers. The CE routers receive those reflected IP network prefixes and the corresponding transport IP address(es) to reach that CE router in which those IP network prefixes belong and register them in their corresponding routing/forwarding data structures. In this way, the CE routers learn how to reach each other.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: December 4, 2018
    Assignee: VERSA NETWORKS, INC.
    Inventors: Apurva Mehta, Shivaprakash Shenoy, Ramanarayanan Ramakrishnan, Krishna Sankaran
  • Publication number: 20170214547
    Abstract: A method and apparatus for connecting multiple customer sites over a wide area network (WAN) using an overlay network is described. In one embodiment of the invention, each one of multiple customer edge (CE) routers establishes a Border Gateway Protocol (BGP) session with one or more BGP route reflectors and announces their private IP network prefixes and one or more transport IP addresses to reach that CE router. The BGP route reflector(s) reflect those IP network prefixes and the one or more transport IP addresses to reach that specific CE router to the other CE routers. The CE routers receive those reflected IP network prefixes and the corresponding transport IP address(es) to reach that CE router in which those IP network prefixes belong and register them in their corresponding routing/forwarding data structures. In this way, the CE routers learn how to reach each other.
    Type: Application
    Filed: April 10, 2017
    Publication date: July 27, 2017
    Inventors: Apurva Mehta, Shivaprakash Shenoy, Ramanarayanan Ramakrishnan, Krishna Sankaran
  • Patent number: 9621460
    Abstract: A method and apparatus for connecting multiple customer sites over a wide area network (WAN) using an overlay network is described. In one embodiment of the invention, each one of multiple customer edge (CE) routers establishes a Border Gateway Protocol (BGP) session with one or more BGP route reflectors and announces their private IP network prefixes and one or more transport IP addresses to reach that CE router. The BGP route reflector(s) reflect those IP network prefixes and the one or more transport IP addresses to reach that specific CE router to the other CE routers. The CE routers receive those reflected IP network prefixes and the corresponding transport IP address(es) to reach that CE router in which those IP network prefixes belong and register them in their corresponding routing/forwarding data structures. In this way, the CE routers learn how to reach each other.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: April 11, 2017
    Assignee: VERSA NETWORKS, INC.
    Inventors: Apurva Mehta, Shivaprakash Shenoy, Ramanarayanan Ramakrishnan, Krishna Sankaran
  • Patent number: 9100198
    Abstract: A provider edge bridge in a service provider network receives multiple media access control (MAC) Registration Protocol (MMRP) registration messages from customer networks via tunnels. The provider edge bridge snoops the MMRP registration messages to obtain multicast MAC addresses from the registration messages, and tunnels the MMRP registration messages toward one or more other bridges. The provider edge bridge constructs multicast forwarding tables based on the multicast addresses obtained from snooping the MMRP registrations, and uses the multicast forwarding tables for forwarding data units from the provider edge bridge towards destinations.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: August 4, 2015
    Assignee: Juniper Networks, Inc.
    Inventors: Sri Sairam Goli, CunZhi Lu, Ramanarayanan Ramakrishnan, Ramasamy Ramanathan
  • Publication number: 20140198794
    Abstract: A method and apparatus for connecting multiple customer sites over a wide area network (WAN) using an overlay network is described. In one embodiment of the invention, each one of multiple customer edge (CE) routers establishes a Border Gateway Protocol (BGP) session with one or more BGP route reflectors and announces their private IP network prefixes and one or more transport IP addresses to reach that CE router. The BGP route reflector(s) reflect those IP network prefixes and the one or more transport IP addresses to reach that specific CE router to the other CE routers. The CE routers receive those reflected IP network prefixes and the corresponding transport IP address(es) to reach that CE router in which those IP network prefixes belong and register them in their corresponding routing/forwarding data structures. In this way, the CE routers learn how to reach each other.
    Type: Application
    Filed: January 8, 2014
    Publication date: July 17, 2014
    Inventors: Apurva Mehta, Shivaprakash Shenoy, Ramanarayanan Ramakrishnan, Krishna Sankaran
  • Patent number: 8724456
    Abstract: Techniques are described for selecting an alternate path for end-to-end service data traffic that traverses multi-homed routers that provide the service to customer networks. For example, as described herein, a router that is a member of a first multi-homing set connected to a layer two (L2) network with one of a plurality of first access links. The router advertises a status of one of the first access links to a second multi-homing set connected to the first multi-homing set with one or more core links. A core link database stores advertised status information for access links of the first and second multi-homing set. Upon a link failure, a path selector selects a core link to transport service data traffic and directs a switch module to switch to active a status a first access links that connects to a router in the first multi-homing set connected to the selected core link.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: May 13, 2014
    Assignee: Juniper Networks, Inc.
    Inventors: Bin William Hong, Apurva Mehta, Ramanarayanan Ramakrishnan, Huaxiang Sun, Prakash Kamath
  • Publication number: 20130215892
    Abstract: A provider edge bridge in a service provider network receives multiple media access control (MAC) Registration Protocol (MMRP) registration messages from customer networks via tunnels. The provider edge bridge snoops the MMRP registration messages to obtain multicast MAC addresses from the registration messages, and tunnels the MMRP registration messages toward one or more other bridges. The provider edge bridge constructs multicast forwarding tables based on the multicast addresses obtained from snooping the MMRP registrations, and uses the multicast forwarding tables for forwarding data units from the provider edge bridge towards destinations.
    Type: Application
    Filed: March 29, 2013
    Publication date: August 22, 2013
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Sri Sairam GOLI, CunZhi Lu, Ramanarayanan Ramakrishnan, Ramasamy Ramanathan
  • Patent number: 8514746
    Abstract: The reliability of the connection of a client edge (CE) device to a core network may be improved using redundant provider edge (PE) devices. A first of the PE devices may monitor a connection to the core network, where the PE device acts as a root device in a set of devices that implement a spanning tree using a spanning tree protocol and where a second PE device in the set of devices additionally connects to the core network. The PE device may additionally detect failure of the connection of the PE device to the core network; and change, in response to the detected failure of the connection, a spanning tree protocol priority value of the device to a value having a lower priority than that of the second PE device.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: August 20, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Sri Goli, Ramanarayanan Ramakrishnan, Deepak Ojha, Apurva Mehta
  • Patent number: 8509248
    Abstract: Methods, apparatus, and products for routing frames in a network using bridge identifiers, wherein the network includes a plurality of bridge nodes. At least one of the bridge nodes operates as an ingress bridge node through which frames are received into the network. At least one of the bridge nodes operates as an egress bridge node through which frames are transmitted out of the network. One of the bridge nodes receives, from the ingress bridge node, a frame for transmission to a destination node. The destination node connects to the network through the egress bridge node. The frame includes an ingress bridge identifier and an egress bridge identifier. The bridge that received the frame then routes the frame to the egress bridge node through which the destination node connects to the network in dependence upon the ingress bridge identifier and the egress bridge identifier included in the frame.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: August 13, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Apurva Mehta, Ramasamy Ramanathan, Kumar Mehta, Ramanarayanan Ramakrishnan
  • Patent number: 8467316
    Abstract: In general, techniques are described for enhanced learning in layer two (L2) networks. A first network device of the intermediate network comprising a control unit and an interface may implement these techniques. The control unit executes a loop-prevention protocol (LPP) that determines a bridge identifier associated with a second network device of the intermediate network, where the first and second network devices each couple to a first network. The LPP selects the second network device as a root bridge and detects a topology change that splits the first network into sub-networks. The interface then outputs a message to direct remaining network devices of the intermediate network to clear L2 address information learned when forwarding L2 communications. The message includes the bridge identifier determined by the loop-prevention protocol as the root bridge and directs these remaining network devices to clear only the L2 addresses learned from this bridge identifier.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: June 18, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Sri Goli, Ramasamy Ramanathan, Ramanarayanan Ramakrishnan, Sanjiv Doshi, Deepak Ojha, Jagadish Grandhi
  • Patent number: 8428062
    Abstract: A provider edge bridge in a service provider network receives multiple media access control (MAC) Registration Protocol (MMRP) registration messages from customer networks via tunnels. The provider edge bridge snoops the MMRP registration messages to obtain multicast MAC addresses from the registration messages, and tunnels the MMRP registration messages toward one or more other bridges. The provider edge bridge constructs multicast forwarding tables based on the multicast addresses obtained from snooping the MMRP registrations, and uses the multicast forwarding tables for forwarding data units from the provider edge bridge towards destinations.
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: April 23, 2013
    Assignee: Juniper Networks, Inc.
    Inventors: Sri Sairam Goli, CunZhi Lu, Ramanarayanan Ramakrishnan, Ramasamy Ramanathan
  • Patent number: 8199753
    Abstract: Methods, apparatus, and products are disclosed for forwarding frames in a computer network using shortest path bridging (‘SPB’). The network includes multiple bridges, and each edge bridge is assigned a unique service virtual local area network (‘VLAN’) identifier. One of the bridges receives a frame for transmission to a destination node. The received frame includes a service VLAN identifier for the ingress bridge through which the frame entered the network and a customer VLAN identifier. The one bridge identifies an SPB forwarding tree in dependence upon the service VLAN identifier. The SPB forwarding tree specifies a shortest route in the network from the ingress bridge through the one bridge to the other bridges in the network. The one bridge then forwards the received frame to the egress bridge without MAC-in-MAC encapsulation in dependence upon the SPB forwarding tree and the customer VLAN identifier.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: June 12, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: Apurva Mehta, Kumar Mehta, Krishna Sankaran, Rajagopalan Subbiah, Ramanarayanan Ramakrishnan, Bin William Hong, Ananda Sathyanarayana
  • Patent number: 8195989
    Abstract: A device may detect and report failure in point-to-point Ethernet links. In one implementation, the device may determine, based on a periodic timing signal, whether at least one packet was received on an incoming Ethernet link during a previous period of the periodic timing signal. The device may update an entry in a circular buffer to indicate whether the at least one packet was received during the previous period of the periodic timing signal and analyze the circular buffer to determine whether there is a signal failure on the incoming Ethernet link.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: June 5, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: CunZhi Lu, Ramanarayanan Ramakrishnan
  • Patent number: 8125928
    Abstract: Methods, apparatus, and products for routing frames in a shortest path computer network for a multi-homed legacy bridge, wherein the network includes a plurality of bridges. At least two of the plurality of bridges operate as edge bridges through which the frames ingress and egress the network. A first edge bridge identifies a legacy bridge nickname for a legacy bridge connected to the network through the first edge bridge and a second edge bridge using active-active link aggregation. The first bridge receives a frame from the legacy bridge and determines, in dependence upon the frame's destination node address, an egress bridge nickname for a third bridge through which a destination node connects to the network. The first bridge then adds the legacy bridge nickname and the egress bridge nickname to the frame and routes the frame to the third bridge in dependence upon the egress bridge nickname.
    Type: Grant
    Filed: July 24, 2009
    Date of Patent: February 28, 2012
    Assignee: Juniper Networks, Inc.
    Inventors: Apurva Mehta, Kumar Mehta, Ramasamy Ramanathan, Krishna Sankaran, Ramanarayanan Ramakrishnan, Shiva Shenoy, Gopi Krishna
  • Publication number: 20110200042
    Abstract: A provider edge bridge in a service provider network receives multiple media access control (MAC) Registration Protocol (MMRP) registration messages from customer networks via tunnels. The provider edge bridge snoops the MMRP registration messages to obtain multicast MAC addresses from the registration messages, and tunnels the MMRP registration messages toward one or more other bridges. The provider edge bridge constructs multicast forwarding tables based on the multicast addresses obtained from snooping the MMRP registrations, and uses the multicast forwarding tables for forwarding data units from the provider edge bridge towards destinations.
    Type: Application
    Filed: February 16, 2010
    Publication date: August 18, 2011
    Applicant: JUNIPER NETWORKS INC.
    Inventors: Sri Sairam GOLI, CunZhi LU, Ramanarayanan RAMAKRISHNAN, Ramasamy RAMANATHAN
  • Publication number: 20110019678
    Abstract: Methods, apparatus, and products for routing frames in a shortest path computer network for a multi-homed legacy bridge, wherein the network includes a plurality of bridges. At least two of the plurality of bridges operate as edge bridges through which the frames ingress and egress the network. A first edge bridge identifies a legacy bridge nickname for a legacy bridge connected to the network through the first edge bridge and a second edge bridge using active-active link aggregation. The first bridge receives a frame from the legacy bridge and determines, in dependence upon the frame's destination node address, an egress bridge nickname for a third bridge through which a destination node connects to the network. The first bridge then adds the legacy bridge nickname and the egress bridge nickname to the frame and routes the frame to the third bridge in dependence upon the egress bridge nickname.
    Type: Application
    Filed: July 24, 2009
    Publication date: January 27, 2011
    Applicant: JUNIPER NETWORKS, INC.
    Inventors: Apurva Mehta, Kumar Mehta, Ramasamy Ramanathan, Krishna Sankaran, Ramanarayanan Ramakrishnan, Shiva Shenoy, Gopi Krishna
  • Patent number: 7876710
    Abstract: A method may include receiving a packet including a destination address, identifying a destination address entry based on the destination address, the destination address entry including an address identifier, comparing the address identifier to an event identifier, determining whether an event occurred based on the comparison, and forwarding the packet on an alternate path if it is determined that the event occurred.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: January 25, 2011
    Assignee: Juniper Networks, Inc.
    Inventors: Sunesh Rustagi, Apurva Mehta, Ramanarayanan Ramakrishnan, Rajagopalan Subbiah
  • Publication number: 20100309912
    Abstract: Methods, apparatus, and products are disclosed for forwarding frames in a computer network using shortest path bridging (‘SPB’). The network includes multiple bridges, and each edge bridge is assigned a unique service virtual local area network (‘VLAN’) identifier. One of the bridges receives a frame for transmission to a destination node. The received frame includes a service VLAN identifier for the ingress bridge through which the frame entered the network and a customer VLAN identifier. The one bridge identifies an SPB forwarding tree in dependence upon the service VLAN identifier. The SPB forwarding tree specifies a shortest route in the network from the ingress bridge through the one bridge to the other bridges in the network. The one bridge then forwards the received frame to the egress bridge without MAC-in-MAC encapsulation in dependence upon the SPB forwarding tree and the customer VLAN identifier.
    Type: Application
    Filed: June 5, 2009
    Publication date: December 9, 2010
    Applicant: Juniper Networks, Inc.
    Inventors: Apurva Mehta, Kumar Mehta, Krishna Sankaran, Rajagopalan Subbiah, Ramanarayanan Ramakrishnan, Bin William Hong, Ananda Sathyanarayana
  • Publication number: 20100165995
    Abstract: Methods, apparatus, and products for routing frames in a network using bridge identifiers, wherein the network includes a plurality of bridge nodes. At least one of the bridge nodes operates as an ingress bridge node through which frames are received into the network. At least one of the bridge nodes operates as an egress bridge node through which frames are transmitted out of the network. One of the bridge nodes receives, from the ingress bridge node, a frame for transmission to a destination node. The destination node connects to the network through the egress bridge node. The frame includes an ingress bridge identifier and an egress bridge identifier. The bridge that received the frame then routes the frame to the egress bridge node through which the destination node connects to the network in dependence upon the ingress bridge identifier and the egress bridge identifier included in the frame.
    Type: Application
    Filed: December 29, 2008
    Publication date: July 1, 2010
    Applicant: Juniper Networks, Inc.
    Inventors: Apurva Mehta, Ramasamy Ramanathan, Kumar Mehta, Ramanarayanan Ramakrishnan
  • Publication number: 20100027543
    Abstract: A method may include receiving a packet including a destination address, identifying a destination address entry based on the destination address, the destination address entry including an address identifier, comparing the address identifier to an event identifier, determining whether an event occurred based on the comparison, and forwarding the packet on an alternate path if it is determined that the event occurred.
    Type: Application
    Filed: July 30, 2008
    Publication date: February 4, 2010
    Applicant: Juniper Networks, Inc.
    Inventors: Sunesh Rustagi, Apurva Mehta, Ramanarayanan Ramakrishnan, Rajagopalan Subbiah