Patents by Inventor Krishna Doddapaneni
Krishna Doddapaneni 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).
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Publication number: 20190173777Abstract: Aspects of the subject disclosure relate to methods for detecting a link failure between the first network device and a destination node, receiving a data packet addressed to the destination node, and rewriting encapsulation information of the first data packet. Subsequent to rewriting the encapsulation information of the first data packet, the first data packet is forwarded to a second network device (e.g., using updated address information in the packet header), wherein the second network device is paired with the first network device in the virtual port channel. In certain aspects, systems and computer readable media are also provided.Type: ApplicationFiled: February 5, 2019Publication date: June 6, 2019Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 10225179Abstract: Aspects of the subject disclosure provide methods for avoiding a packet bounce event in a virtual port channel (VPC). A method of the technology can include steps for detecting a link failure event (e.g., between a first network device and a destination node), and receiving a data packet addressed to the destination node. In some implementations, the method can additionally include steps for rewriting encapsulation information of the first data packet. Systems and computer-readable media are also provided.Type: GrantFiled: December 5, 2016Date of Patent: March 5, 2019Assignee: Cisco Technology, Inc.Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 10187302Abstract: Systems, methods, and non-transitory computer-readable storage media for translating source addresses in an overlay network. An access switch in an overlay network, such as a VXLAN, may receive an encapsulated packet from a tunnel endpoint in the overlay network. The encapsulated packet may originate from a host associated with the tunnel endpoint and be encapsulated at the tunnel endpoint with a first source tunnel endpoint address and a destination tunnel endpoint address. The access switch may replace the first source tunnel endpoint address in the encapsulated packet with a second source tunnel endpoint address of the access switch to yield a translated packet. The access switch may then transmit the translated packet towards the destination tunnel endpoint address.Type: GrantFiled: January 12, 2018Date of Patent: January 22, 2019Assignee: CISCO TECHNOLOGY, INC.Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 10142168Abstract: Systems, methods, and computer-readable media for improving debugging and troubleshooting of datacenter networks, and more particularly improving the speed of forwarding/data path related problems without going into ASIC level debugging. A switch could, for example, have a processor which communicates with an ASIC. The processor can receive flow information and a notification from the ASIC, the notification indicating a predefined error condition has been identified in a packet. The processor can modify the ASIC programming based on the notification, such that the ASIC records additional, more-detailed, flow information for the switch. The processor can then receive, from the modified ASIC, the additional flow information. The additional flow information can then be used (either by the processor or by an operator) to identify the exact reason for the errors in the flow path.Type: GrantFiled: July 27, 2016Date of Patent: November 27, 2018Assignee: CISCO TECHNOLOGY, INC.Inventors: Ramanan Vaidyanathan, Ajay Modi, Azeem Suleman, Krishna Doddapaneni, Sarang Dharmapurikar, Ganlin Wu
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Publication number: 20180205624Abstract: Disclosed is a method for continuous in-line monitoring of data-centric traffic to guarantee application performance. The method includes, in each switch of a plurality of switches in a network fabric, grouping all packets entering each respective switch of the plurality of switches based on either 5-tuple applications or EPG based applications, collecting performance statistics at every hop in the network fabric across all flows in-line in a flow table maintained in each respective switch and periodically exporting the performance statistics to analysis module.Type: ApplicationFiled: January 19, 2017Publication date: July 19, 2018Inventors: Smita Rai, Ajay Modi, Krishna Doddapaneni, Kit Chiu Chu
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Patent number: 10009229Abstract: A determination is made at a network connected device that a network policy is to be verified. The network policy is applied to network packets sent to an endpoint within a network, and the application of the policy to network traffic can result in at least two outcomes. Another determination is made at the network connected device that a switch is provisionable to host the endpoint. The network connected device provisions a simulated endpoint version of the endpoint at the switch to host the policy. At least one packet is sent to the simulated endpoint via the network connected device for each of the at least two outcomes of the policy. At least one response is received by the network connected device from the simulated endpoint indicating how the policy was applied to each of the packets.Type: GrantFiled: June 11, 2015Date of Patent: June 26, 2018Assignee: Cisco Technology, Inc.Inventors: Ayaskant Pani, Ravi Raju, Jalajadevi Ganapathy, Aubin Sanyal, Krishna Doddapaneni, Sanjay Thyamagundalu, Igino C. Cafiero
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Publication number: 20180139132Abstract: Disclosed herein are methods of forwarding packets on a network, such as a leaf-spine network having leaf devices and spine devices. The methods may include receiving a packet at an ingress leaf device, and determining based, at least in part, on a header of the packet whether the packet is to be transmitted to a spine device. The methods may further include ascertaining based, at least in part, on a header of the packet whether to perform encapsulation on the packet, encapsulating the packet according to a result of the ascertaining, and then transmitting the packet to a spine device according to a result of the determining. Also disclosed herein are network apparatuses which include a processor and a memory, at least one of the processor or the memory being configured to perform some or all of the foregoing described methods.Type: ApplicationFiled: December 27, 2017Publication date: May 17, 2018Inventors: Thomas James Edsall, Navindra Yadav, Francisco M. Matus, Kit Chiu Chu, Michael R. Smith, Sameer Merchant, Krishna Doddapaneni, Satyam Sinha
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Publication number: 20180139124Abstract: Systems, methods, and non-transitory computer-readable storage media for translating source addresses in an overlay network. An access switch in an overlay network, such as a VXLAN, may receive an encapsulated packet from a tunnel endpoint in the overlay network. The encapsulated packet may originate from a host associated with the tunnel endpoint and be encapsulated at the tunnel endpoint with a first source tunnel endpoint address and a destination tunnel endpoint address. The access switch may replace the first source tunnel endpoint address in the encapsulated packet with a second source tunnel endpoint address of the access switch to yield a translated packet. The access switch may then transmit the translated packet towards the destination tunnel endpoint address.Type: ApplicationFiled: January 12, 2018Publication date: May 17, 2018Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 9935782Abstract: Internet Group Management Protocol (IGMP) snooping includes flooding an IGMP query received at a border leaf switch from a multicast router connected to the multicast router to all host devices in a given bridge domain through leaf switches in the bridge domain, and receiving multiple join requests from the connected host devices at the leaf switches. The IGMP snooping also includes consolidating the multiple join requests received at the leaf switches into a multicast groups membership repository to indicate for each leaf switch the multicast group membership of interest in the given bridge domain, and sending the repository to the border leaf switch to enable the border leaf switch to send a consolidated IGMP proxy report on behalf of the leaf switches to the multicast router based on the repository and that indicates the multicast membership of interest in the given bridge domain.Type: GrantFiled: April 14, 2015Date of Patent: April 3, 2018Assignee: Cisco Technology, Inc.Inventors: Ravindra N. Rathi, Pavan Ramakrishnaiah, Jialin Song, Krishna Doddapaneni, Sanjay Thyamagundalu, Bharat Bandaru
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Publication number: 20180034686Abstract: Systems, methods, and computer-readable media for improving debugging and troubleshooting of datacenter networks, and more particularly improving the speed of forwarding/data path related problems without going into ASIC level debugging. A switch could, for example, have a processor which communicates with an ASIC. The processor can receive flow information and a notification from the ASIC, the notification indicating a predefined error condition has been identified in a packet. The processor can modify the ASIC programming based on the notification, such that the ASIC records additional, more-detailed, flow information for the switch. The processor can then receive, from the modified ASIC, the additional flow information. The additional flow information can then be used (either by the processor or by an operator) to identify the exact reason for the errors in the flow path.Type: ApplicationFiled: July 27, 2016Publication date: February 1, 2018Inventors: Ramanan Vaidyanathan, Ajay Modi, Azeem Suleman, Krishna Doddapaneni, Sarang Dharmapurikar, Ganlin Wu
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Patent number: 9876711Abstract: Systems, methods, and non-transitory computer-readable storage media for translating source addresses in an overlay network. An access switch in an overlay network, such as a VXLAN, may receive an encapsulated packet from a tunnel endpoint in the overlay network. The encapsulated packet may originate from a host associated with the tunnel endpoint and be encapsulated at the tunnel endpoint with a first source tunnel endpoint address and a destination tunnel endpoint address. The access switch may replace the first source tunnel endpoint address in the encapsulated packet with a second source tunnel endpoint address of the access switch to yield a translated packet. The access switch may then transmit the translated packet towards the destination tunnel endpoint address.Type: GrantFiled: September 4, 2014Date of Patent: January 23, 2018Assignee: CISCO TECHNOLOGY, INC.Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 9876715Abstract: Disclosed herein are methods of forwarding packets on a network, such as a leaf-spine network having leaf devices and spine devices. The methods may include receiving a packet at an ingress leaf device, and determining based, at least in part, on a header of the packet whether the packet is to be transmitted to a spine device. The methods may further include ascertaining based, at least in part, on a header of the packet whether to perform encapsulation on the packet, encapsulating the packet according to a result of the ascertaining, and then transmitting the packet to a spine device according to a result of the determining. Also disclosed herein are network apparatuses which include a processor and a memory, at least one of the processor or the memory being configured to perform some or all of the foregoing described methods.Type: GrantFiled: October 31, 2014Date of Patent: January 23, 2018Assignee: CISCO TECHNOLOGY, INC.Inventors: Thomas James Edsall, Navindra Yadav, Francisco M. Matus, Kit Chiu Chu, Michael R. Smith, Sameer Merchant, Krishna Doddapaneni, Satyam Sinha
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Publication number: 20180013653Abstract: Systems, methods and computer-readable storage devices each provide, for a given flow entry in a flow table associated with a packet flow, a first atomic counter associated with a first color and a second atomic counter associated with a second color. The system, for a first coloring interval, marks traffic in the packet flow from a tenant to a fabric as the first color and increments the first atomic counter. At a conclusion of the first coloring interval and for a second coloring interval, the system marks the traffic in the packet flow from the tenant to the fabric as the second color and increments the second atomic counter. The system compares first packet counts associated with the first color at an ingress point with second packet counts associated with the first color at an egress point to the fabric.Type: ApplicationFiled: July 11, 2016Publication date: January 11, 2018Inventors: Nalinaksh Pai, Ravikanth Nasika, Krishna Doddapaneni, Azeem Suleman, Rohit Puri
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Publication number: 20170250912Abstract: Aspects of the subject technology relate to solutions for transporting network traffic over an overlay network. A first tunnel endpoint in an overlay network can receive an encapsulated packet from a second tunnel endpoint. The encapsulated packet may have been encapsulated at the second tunnel endpoint based on another packet originating from a source host that is associated with the second tunnel endpoint. The encapsulated packet can include a source host address for the source host and a source tunnel endpoint address for the second tunnel endpoint. The first tunnel endpoint can then update a lookup table based on an association between the source host address and the source tunnel endpoint address.Type: ApplicationFiled: May 16, 2017Publication date: August 31, 2017Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Publication number: 20170214619Abstract: The subject technology addresses a need for improving utilization of network bandwidth in a multicast network environment. More specifically, the disclosed technology provides solutions for extending multipathing to tenant multicast traffic in an overlay network, which enables greater bandwidth utilization for multicast traffic. In some aspects, nodes in the overlay network can be connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network.Type: ApplicationFiled: April 7, 2017Publication date: July 27, 2017Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha, Sameer Merchant
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Patent number: 9686180Abstract: Systems, methods, and non-transitory computer-readable storage media for managing routing information in overlay networks. A first tunnel endpoint in an overlay network may receive an encapsulated packet from a second tunnel endpoint. The encapsulated packet may have been encapsulated at the second tunnel endpoint based on another packet originating from a source host that is associated with the second tunnel endpoint. The encapsulated packet can include a source host address for the source host and a source tunnel endpoint address for the second tunnel endpoint. The first tunnel endpoint can then update a lookup table based on an association between the source host address and the source tunnel endpoint address.Type: GrantFiled: September 4, 2014Date of Patent: June 20, 2017Assignee: CISCO TECHNOLOGY, INC.Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 9654385Abstract: The subject technology addresses the need in the art for improving utilization of network bandwidth in a multicast network environment. More specifically, the disclosed technology addresses the need in the art for extending multipathing to tenant multicast traffic in an IP overlay network, which enables the network to fully utilize available bandwidth for multicast traffic. In some examples, nodes in the overlay network may be connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network.Type: GrantFiled: October 7, 2014Date of Patent: May 16, 2017Assignee: Cisco Technology, IncInventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha, Sameer Merchant
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Publication number: 20170085469Abstract: Aspects of the subject disclosure provide methods for avoiding a packet bounce event in a virtual port channel (VPC). A method of the technology can include steps for detecting a link failure event (e.g., between a first network device and a destination node), and receiving a data packet addressed to the destination node. In some implementations, the method can additionally include steps for rewriting encapsulation information of the first data packet. Systems and computer-readable media are also provided.Type: ApplicationFiled: December 5, 2016Publication date: March 23, 2017Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Patent number: 9544224Abstract: Aspects of the subject disclosure relate to methods for detecting a link failure between the first network device and a destination node, receiving a data packet addressed to the destination node, and rewriting encapsulation information of the first data packet. Subsequent to rewriting the encapsulation information of the first data packet, the first data packet is forwarded to a second network device (e.g., using updated address information in the packet header), wherein the second network device is paired with the first network device in the virtual port channel. In certain aspects, systems and computer readable media are also provided.Type: GrantFiled: October 7, 2014Date of Patent: January 10, 2017Assignee: Cisco Technology, Inc.Inventors: Kit Chiu Chu, Thomas J. Edsall, Navindra Yadav, Francisco M. Matus, Krishna Doddapaneni, Satyam Sinha
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Publication number: 20160366019Abstract: A determination is made at a network connected device that a network policy is to be verified. The network policy is applied to network packets sent to an endpoint within a network, and the application of the policy to network traffic can result in at least two outcomes. Another determination is made at the network connected device that a switch is provisionable to host the endpoint. The network connected device provisions a simulated endpoint version of the endpoint at the switch to host the policy. At least one packet is sent to the simulated endpoint via the network connected device for each of the at least two outcomes of the policy. At least one response is received by the network connected device from the simulated endpoint indicating how the policy was applied to each of the packets.Type: ApplicationFiled: June 11, 2015Publication date: December 15, 2016Inventors: Ayaskant Pani, Ravi Raju, Jalajadevi Ganapathy, Aubin Sanyal, Krishna Doddapaneni, Sanjay Thyamagundalu, Igino C. Cafiero