公开(公告)号：US20250132972A1

公开(公告)日：2025-04-24

申请号：US18489057

申请日：2023-10-18

Applicant: Cisco Technology, Inc.

Inventor： Tarek Saad ,  Neeraj Malhotra ,  Satya R Mohanty ,  Nitin Kumar

IPC: H04L41/0659 ,  H04L45/02

Abstract: Methods and systems are described herein for reducing border gateway protocol (BGP) signaling for multi-homed devices. In one aspect, the method comprises: receiving one or more signals from one or more provider edge devices. The one or more signals include an address of a membership group associated with a multi-homed device. A router receives, from a provider edge device of the one or more provider edge devices, a service prefix. The service prefix is associated with the multi-homed device and the membership group. The router may store the service prefix and the one or more provider edge devices and connect, according to the service prefix and the one or more provider edge devices, to the multi-homed device associated with the membership group.

公开(公告)号：US20240356838A1

公开(公告)日：2024-10-24

申请号：US18490127

申请日：2023-10-19

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Ramchander R Nadipally ,  Neeraj Malhotra

IPC: H04L45/00 ,  H04L45/02 ,  H04L45/76

CPC classification number: H04L45/32 ,  H04L45/02 ,  H04L45/76

Abstract: In one aspect, a method includes receiving, at a first PE in a network of EVPNs, one or more of information on status of one or more nodes connected to the first PE, the one or more nodes being one of a leaf node or a root node; and a respective advertisement message from one or more second PEs. The method further includes performing one or more of generating, based on the information, a route advertisement message indicative of the status of the one or more nodes connected to the first PE, wherein the route advertisement message is shared with one or more second PEs; and based on the respective advertisement message received from each of the one or more second PEs, dynamically adjust configurations at the first PE, to perform ingress filtering or egress filtering of Broadcast, Unknown Unicast, and Multicast (BUM) traffic received at the first PE

公开(公告)号：US11979256B2

公开(公告)日：2024-05-07

申请号：US17813959

申请日：2022-07-21

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Balaji Pitta Venkatachalapathy ,  Krishnaswamy Muddenahally Ananthamurthy ,  Ali Sajassi ,  Dhananjaya Kasargod Rao

IPC: H04L12/46 ,  H04L45/00 ,  H04L45/02 ,  H04L45/50 ,  H04L45/741 ,  H04L101/622

CPC classification number: H04L12/4641 ,  H04L45/02 ,  H04L45/50 ,  H04L45/66 ,  H04L45/741 ,  H04L2101/622

Abstract: In one embodiment, a method includes receiving, by a route reflector, a subscription request from a first provider edge node in a network and generating a subscription policy for the first provider edge node. The method also includes receiving a first Ethernet Virtual Private Network (EVPN) Type 2 Route from a second provider edge node, assigning a sequence number to the first EVPN Type 2 Route, and communicating the first EVPN Type 2 Route with the sequence number to the first provider edge node. The method further includes receiving a second EVPN Type 2 Route from a third provider edge node, generating an updated sequence number in response to receiving the second EVPN Type 2 Route from the third provider edge node, and communicating the second EVPN Type 2 Route with the updated sequence number to the first provider edge node and the second provider node.

公开(公告)号：US20240137305A1

公开(公告)日：2024-04-25

申请号：US18401208

申请日：2023-12-29

Applicant: Cisco Technology, Inc.

Inventor： Samir D Thoria ,  Ali Sajassi ,  Rajesh Sharma ,  Kesavan Thiruvenkatasamy ,  Aparna Pattekar ,  Lukas Krattiger ,  Neeraj Malhotra

IPC: H04L45/02 ,  H04L12/46

CPC classification number: H04L45/04 ,  H04L12/46

Abstract: This disclosure describes techniques for enabling interoperability between asymmetric and symmetric Integrated Routing and Bridging (IRB) modes. An interfacing component may be configured to receive a first route advertisement from a first edge node in a Layer-2 (L2) fabric. The first route advertisement may correspond to an asymmetric format route, for instance. The interfacing component may be further configured to receive a second route advertisement from a second edge node in a L2/Layer-3 (L3) fabric. The second edge node may be configured for symmetric integrated routing and bridging (IRB). The interfacing component may be configured to re-originate the first route and the second route such that the interfacing component is included as a hop in the resultant routes between the L2 fabric and the L2/L3 fabric.

公开(公告)号：US20220247599A1

公开(公告)日：2022-08-04

申请号：US17164690

申请日：2021-02-01

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Balaji Pitta Venkatachalapathy ,  Krishnaswamy Muddenahally Ananthamurthy ,  Ali Sajassi ,  Dhananjaya Kasargod Rao

IPC: H04L12/46 ,  H04L12/723 ,  H04L12/721 ,  H04L12/751 ,  H04L12/749 ,  H04L29/12

Abstract: In one embodiment, a method includes receiving, by a route reflector, a subscription request from a first provider edge node in a network and generating a subscription policy for the first provider edge node. The method also includes receiving a first Ethernet Virtual Private Network (EVPN) Type 2 Route from a second provider edge node, assigning a sequence number to the first EVPN Type 2 Route, and communicating the first EVPN Type 2 Route with the sequence number to the first provider edge node. The method further includes receiving a second EVPN Type 2 Route from a third provider edge node, generating an updated sequence number in response to receiving the second EVPN Type 2 Route from the third provider edge node, and communicating the second EVPN Type 2 Route with the updated sequence number to the first provider edge node and the second provider node.

公开(公告)号：US20180309691A1

公开(公告)日：2018-10-25

申请号：US15496158

申请日：2017-04-25

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Aparna Pattekar

IPC: H04L12/801 ,  H04L12/46

CPC classification number: H04L47/34 ,  H04L12/4641 ,  H04L49/1569

Abstract: Presented herein are techniques that enable Ethernet Virtual Private Networks (EVPNs) to support use cases where either the Layer 2 or Layer 3 route associated with a virtual endpoint is different after the virtual endpoint migrates/moves to a different location. In particular, a networking device running an overlay network detects that a virtual endpoint has migrated on the overlay network from a first computing device to a second computing device. The networking device determines a modified Layer 2/Layer 3 route for the virtual endpoint at the second computing device, as well as a sequence number for association with the modified Layer 2/Layer 3 route. The sequence number is determined based on a sequence number associated with a parent Layer 2 route for the modified Layer 2/Layer 3 route.

公开(公告)号：US11924083B2

公开(公告)日：2024-03-05

申请号：US17343697

申请日：2021-06-09

Applicant: Cisco Technology, Inc.

Inventor： Samir Thoria ,  Neeraj Malhotra ,  Lukas Krattiger ,  Ali Sajassi ,  Rajesh Sharma ,  Kesavan Thiruvenkatasamy ,  Aparna Pattekar

IPC: H04L45/02 ,  H04L12/46

CPC classification number: H04L45/04 ,  H04L12/46

Abstract: This disclosure describes techniques for enabling interoperability between asymmetric and symmetric Integrated Routing and Bridging (IRB) modes. An interfacing component may be configured to receive a first route advertisement from a first edge node in a Layer-2 (L2) fabric. The first route advertisement may correspond to an asymmetric format route, for instance. The interfacing component may be further configured to receive a second route advertisement from a second edge node in a L2/Layer-3 (L3) fabric. The second edge node may be configured for symmetric integrated routing and bridging (IRB). The interfacing component may be configured to re-originate the first route and the second route such that the interfacing component is included as a hop in the resultant routes between the L2 fabric and the L2/L3 fabric.

公开(公告)号：US20220417134A1

公开(公告)日：2022-12-29

申请号：US17897890

申请日：2022-08-29

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Satya Ranjan Mohanty ,  Dongling Duan ,  Nitin Kumar ,  Narasimha Prasad Salagame Nagaraj

IPC: H04L45/24 ,  H04L47/17 ,  H04L45/74

Abstract: Techniques and mechanisms for a control plane approach for dense topologies that focusses on discovering shared ECMP groups in the control plane independent of per-prefix learning and then learning prefixes via these shared ECMP groups instead of learning prefixes via one next-hop at a time. In dense topologies, this approach helps minimize BGP path scale, corresponding signaling and enables control plane scaling that is an order of magnitude higher than a traditional eBGP control plane. During link and node topology changes, the described control plane approach enables control plane signaling that is prefix independent and an order of magnitude lower. A control plane approach to path-list sharing and prefix independent signaling on link and node topology changes enables prefix independent convergence (PIC) in scenarios that would not be possible otherwise with traditional FIB driven path-list sharing and PIC.

公开(公告)号：US10432544B2

公开(公告)日：2019-10-01

申请号：US15496158

申请日：2017-04-25

Applicant: Cisco Technology, Inc.

Inventor： Neeraj Malhotra ,  Aparna Pattekar

IPC: H04L12/801 ,  H04L12/46

Abstract: Presented herein are techniques that enable Ethernet Virtual Private Networks (EVPNs) to support use cases where either the Layer 2 or Layer 3 route associated with a virtual endpoint is different after the virtual endpoint migrates/moves to a different location. In particular, a networking device running an overlay network detects that a virtual endpoint has migrated on the overlay network from a first computing device to a second computing device. The networking device determines a modified Layer 2/Layer 3 route for the virtual endpoint at the second computing device, as well as a sequence number for association with the modified Layer 2/Layer 3 route. The sequence number is determined based on a sequence number associated with a parent Layer 2 route for the modified Layer 2/Layer 3 route.

公开(公告)号：US09985867B2

公开(公告)日：2018-05-29

申请号：US15043079

申请日：2016-02-12

Applicant: Cisco Technology, Inc.

Inventor： Liqin Dong ,  Shyam Kapadia ,  Neeraj Malhotra ,  Richard Lam ,  Lukas Krattiger

IPC: H04L12/751

CPC classification number: H04L45/02

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.