Patents by Inventor Lukas Krattiger

Lukas Krattiger 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).

  • Publication number: 20180309685
    Abstract: A first network node of a computer network discovers a host route by leveraging a temporary host route on the control plane of the computer network. The first network node receives, from a source host, a request for a host route associated with a destination host. The first network node determines that it has not previously stored the host route associated with the destination host, and generates a temporary host route associated with the destination host. The first network node propagates the temporary host route across the control plane of the computer network, causing each respective network node to discover if the destination host is connected to the respective network node.
    Type: Application
    Filed: April 25, 2017
    Publication date: October 25, 2018
    Inventors: Sathish Srinivasan, Shyam Kapadia, Deepak Kumar, Indrajanti Pallikala, Rohit Mendiratta, Lukas Krattiger
  • Patent number: 10050876
    Abstract: In one embodiment, a method includes importing a route target for a remote Virtual Routing and Forwarding instance (VRF) at a leaf node in an overlay network, the leaf node comprising at least one local VRF configured thereon, processing routes received for the route target at the leaf node, and installing the routes for the remote VRF at the local VRF at the leaf node to enable inter-VRF communication via the leaf node. An apparatus and logic are also disclosed herein.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: August 14, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Shyam Kapadia, Lukas Krattiger
  • Publication number: 20180191603
    Abstract: Access-side loop mitigation may be provided. First, a first edge device may determine that a duplicate host exists on a network. Then the first edge device may detect a loop in response to determining that the duplicate host exists on the network. Detecting the loop may comprise sending a message on a plurality of access-side ports of the first edge device and then receiving, in response to sending the message on the plurality of access-side ports of the first edge device, a response on a first access-side port of the plurality of access-side ports of the first edge device. Next, the first edge device may mitigate the detected loop in response to receiving the response.
    Type: Application
    Filed: January 3, 2017
    Publication date: July 5, 2018
    Applicant: Cisco Technology, Inc.
    Inventors: Lukas Krattiger, Samir Thoria, Manoj Kumar Pandey
  • Patent number: 9985867
    Abstract: Presented herein are methods for advertising an IP prefix to address the connectivity problem in multi-chassis link aggregation scenario. A peer switch will advertise two VTEP addresses. It will use a physical IP (PIP) address as a next hop (NH) for a prefix route, while continuing to use a VIP for host IP and MAC route advertisement. A new virtual MAC is introduced and it is derived from the VIP as the router MAC associated with VIP. A switch is made to use a VIP for prefix advertisement when a device detects that the same prefix is reachable both locally and from its peer. This saves adjacency entries consumed in the remote VTEPs. These techniques fix the connectivity issue for prefix routes that is exposed with current EVPN, without requiring any additional adjacency resource consumption.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: May 29, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Liqin Dong, Shyam Kapadia, Neeraj Malhotra, Richard Lam, Lukas Krattiger
  • Publication number: 20180077047
    Abstract: Presented herein are techniques to enable seamless mobility of hosts (endpoints) between disaggregated Ethernet virtual private network (EVPN) domains that are connected with one another by an external network (e.g., a Wide-Area Network (WAN)). In one example, a leaf node in the first domain, which was previously connected to a host, receives updated routing information for the host. The leaf node performs a local host verification process to confirm that the host has moved and, in response to confirming that that the host has moved, the first leaf node sends a targeted host announcement message to the host in the second domain.
    Type: Application
    Filed: September 13, 2016
    Publication date: March 15, 2018
    Inventors: Sathish Srinivasan, Vrishabha Sikand, Shyam N. Kapadia, Lukas Krattiger, Massimiliano Ardica
  • Publication number: 20180013654
    Abstract: Presented herein are techniques for actively monitoring, at a network controller, a network location of an endpoint connected to the network based on control plane updates. The network controller is configured to archive the network location of the endpoint, along with local information for the endpoint, in an endpoint tracking database of the network controller.
    Type: Application
    Filed: July 8, 2016
    Publication date: January 11, 2018
    Inventors: Shyam Kapadia, Lukas Krattiger, Wing Hon Yeung, Uffaz Nathaniel, Richard Lam
  • Patent number: 9838315
    Abstract: In one embodiment, a method for improving routing for a stretched subnet includes receiving a first communication on a border leaf of the stretched subnet, where the border leaf is a top of rack (ToR) switch configured to facilitate connectivity between an internal data center fabric and at least one external site associated with the stretched subnet, based on routing information received with the received communication, identifying a source address for the received communication as either from within the internal data center fabric or from the at least one external site, and if the source address is from the external site, storing an abbreviated route based on the source address in at least one hardware table, where the abbreviated route is a route to the at least one external site, and upon subsequent receipt of a second communication to be forwarded to the source address, forwarding the second communication in accordance with the abbreviated route.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: December 5, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Shyam Kapadia, Lukas Krattiger, Vrishab Sikand
  • Publication number: 20170171057
    Abstract: Presented herein are methods for advertising an IP prefix to address the connectivity problem in multi-chassis link aggregation scenario. A peer switch will advertise two VTEP addresses. It will use a physical IP (PIP) address as a next hop (NH) for a prefix route, while continuing to use a VIP for host IP and MAC route advertisement. A new virtual MAC is introduced and it is derived from the VIP as the router MAC associated with VIP. A switch is made to use a VIP for prefix advertisement when a device detects that the same prefix is reachable both locally and from its peer. This saves adjacency entries consumed in the remote VTEPs. These techniques fix the connectivity issue for prefix routes that is exposed with current EVPN, without requiring any additional adjacency resource consumption.
    Type: Application
    Filed: February 12, 2016
    Publication date: June 15, 2017
    Inventors: Liqin Dong, Shyam Kapadia, Neeraj Malhotra, Richard Lam, Lukas Krattiger
  • Publication number: 20170171056
    Abstract: Coexistence and migration of legacy and VXLAN networks may be provided. A first anchor leaf switch and a second anchor leaf switch may detect that they can reach each other over a Virtual Extensible Local Area Network (VXLAN) overlay layer 2 network. In response to detecting that they can reach each other over the VXLAN, the second anchor leaf switch may block VLANs mapped to the VXLAN's VXLAN Network Identifier (VNI) on the second anchor leaf switch's ports connecting to spine routers. In addition, the first anchor leaf switch and the second anchor leaf switch may detect that they can reach each other over a physical layer 2 network. In response to detecting that they can reach each other over a physical layer 2 network, the second anchor leaf switch may block Virtual Extensible Local Area Network (VXLAN) segments at the second anchor leaf switch.
    Type: Application
    Filed: December 9, 2015
    Publication date: June 15, 2017
    Inventors: Liqin Dong, Yibin Yang, Lukas Krattiger, Xinggang Zhou, Di Jin, Siu-Man Leung
  • Patent number: 9590824
    Abstract: Techniques are presented to signal where a virtual machine (host) has moved in a data center networking environment. These techniques use Multiprotocol Border Gateway Protocol (MP BGP) alone, and are particularly useful in a multi-vendor environment using existing standards. Reverse Address Resolution Protocol (RARP) broadcast is not needed, therefore, no L2 extension is needed across a data center interface for tenants that do not require L2 extension for purposes other than a host move. This scheme works for both inter- and intra-fabric moves.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: March 7, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Vrishab Sikand, Liqin Dong, Shyam Kapadia, Lukas Krattiger
  • Publication number: 20160134520
    Abstract: In one embodiment, a method includes importing a route target for a remote Virtual Routing and Forwarding instance (VRF) at a leaf node in an overlay network, the leaf node comprising at least one local VRF configured thereon, processing routes received for the route target at the leaf node, and installing the routes for the remote VRF at the local VRF at the leaf node to enable inter-VRF communication via the leaf node. An apparatus and logic are also disclosed herein.
    Type: Application
    Filed: November 12, 2014
    Publication date: May 12, 2016
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Shyam Kapadia, Lukas Krattiger