公开(公告)号：US11606333B1

公开(公告)日：2023-03-14

申请号：US17686797

申请日：2022-03-04

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Lukas Krattiger ,  Manoj Kumar Pandey

IPC: H04L61/5053 ,  H04L9/40 ,  H04L61/5014 ,  H04L101/622

Abstract: Systems and techniques are provided for synchronizing DHCP snoop information. In some examples, a method can include, performing, by a first PE device from a plurality of PE devices, DHCP snooping of a first plurality of DHCP messages between a DHCP client and a DHCP server, wherein the plurality of PE devices is part of an ethernet segment for multihoming the DHCP client. In some aspects, the method includes determining, based on snooping the first plurality of DHCP messages, an association between an IP address corresponding to the DHCP client and a MAC address corresponding to the DHCP client. In some examples, the method includes sending, by the first PE device to at least one other PE device from the plurality of PE devices, a first route advertisement that includes the association between the IP address corresponding to the DHCP client and the MAC address corresponding to the DHCP client.

公开(公告)号：US11146500B1

公开(公告)日：2021-10-12

申请号：US17087966

申请日：2020-11-03

Applicant: Cisco Technology, Inc.

Inventor： Managa Sunitha Arun Kumar ,  Gowri Mahendran Lingam Chandramohan ,  Laxmikantha Reddy Ponnuru ,  Samir Thoria

IPC: G06F9/46 ,  G06F15/16 ,  G06F15/173 ,  H04L12/911 ,  H04L12/923 ,  H04L12/46 ,  H04L12/26 ,  H04L12/927

Abstract: The present disclosure is directed to systems and methods for transport resource allocation using a centralized control policy, the methods including the steps of receiving node characteristics associated with a plurality of nodes; receiving a centralized policy configuration associated with at least one control policy to be applied based on a set of match conditions; identifying a one or more nodes from the plurality of nodes that satisfy, or that are associated with one or more tunnels that satisfy, the set of match conditions; and applying the at least one control policy to the one or more nodes that satisfy, or to the one or more tunnels that satisfy, the set of match conditions, wherein the at least one control policy is configured to override at least one locally-configured bidirectional forwarding detection (BFD) timer; and/or set a maximum number of tunnels for provisioning at the identified one or more nodes.

公开(公告)号：US20200236444A1

公开(公告)日：2020-07-23

申请号：US16843297

申请日：2020-04-08

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Tapraj Singh ,  Mankamana Prasad Mishra

IPC: H04N21/6405 ,  H04L12/46 ,  H04L29/06 ,  H04N21/24 ,  H04N21/222

Abstract: A method is performed by a first provider edge (PE) of a redundancy group including provider edges configured with an Ethernet virtual private network (EVPN) segment identifier (EVI) and an Ethernet segment identifier (ESI) and that are multi-homed to a customer edge (CE). The method includes, upon receiving from the CE a join request including a group address for a multicast stream, electing a designated forwarder (DF) for the multicast stream. The electing includes: computing for each PE a respective affinity for the DF as a function of a respective address of the PE, the EVI, and the group address; and determining which PE has a largest affinity. The method further includes, if the first PE has the largest affinity or does not have the largest affinity, configuring the first PE as the designated forwarder or not configuring the first PE as the designated forwarder for the multicast stream, respectively.

公开(公告)号：US10237120B2

公开(公告)日：2019-03-19

申请号：US15392346

申请日：2016-12-28

Applicant: Cisco Technology, Inc.

Inventor： Keyur Patel ,  Samir Thoria ,  Mitesh Kanjariya ,  Manoj Pandey

IPC: H04L12/24 ,  H04L12/723 ,  H04L12/46 ,  H04L12/26

Abstract: Systems, devices, and methods for detecting an Ethernet segment failure in an Ethernet virtual private network (EVPN) are described herein. An example method can include monitoring for failure of an Ethernet segment, establishing a bidirectional forwarding detection (BFD) session with a remote peer, and transmitting a BFD control packet to the remote peer over a network. The BFD control packet can include a notification of the failure of the Ethernet segment.

公开(公告)号：US10057386B1

公开(公告)日：2018-08-21

申请号：US15223151

申请日：2016-07-29

Applicant: Cisco Technology, Inc.

Inventor： Ali Sajassi ,  Samir Thoria ,  Ravindra Nandalal Rathi ,  Keyur Patel ,  Derek Man-Kit Yeung

IPC: H04L12/28 ,  H04L12/56 ,  H04L29/06 ,  H04L12/723 ,  H04L12/18 ,  H04L12/46

CPC classification number: H04L69/08 ,  H04L12/1886 ,  H04L45/50

Abstract: Message summarization and flood suppression may be provided. A proxy (e.g., an IGMP Proxy) process may be used to reduce the flooding of messages (e.g., IGMP messages) over a network (e.g., an EVPN network). A triggering process may also be provided for provider edge (PE) devices to setup their underlay multicast tunnels. The proxy may comprise two components: i) a proxy for reports (e.g., IGMP reports); and ii) a proxy for queries (e.g., IGMP Queries).

公开(公告)号：US20180183654A1

公开(公告)日：2018-06-28

申请号：US15392346

申请日：2016-12-28

Applicant: Cisco Technology, Inc.

Inventor： Keyur Patel ,  Samir Thoria ,  Mitesh Kanjariya ,  Manoj Pandey

IPC: H04L12/24 ,  H04L12/723 ,  H04L12/46

CPC classification number: H04L41/0654 ,  H04L12/4641 ,  H04L41/0686 ,  H04L43/0811 ,  H04L43/10 ,  H04L45/04 ,  H04L45/28 ,  H04L45/50 ,  H04L45/66

Abstract: Systems, devices, and methods for detecting an Ethernet segment failure in an Ethernet virtual private network (EVPN) are described herein. An example method can include monitoring for failure of an Ethernet segment, establishing a bidirectional forwarding detection (BFD) session with a remote peer, and transmitting a BFD control packet to the remote peer over a network. The BFD control packet can include a notification of the failure of the Ethernet segment.

公开(公告)号：US20250133022A1

公开(公告)日：2025-04-24

申请号：US19007694

申请日：2025-01-02

Applicant: Cisco Technology, Inc.

Inventor： Samir Thoria ,  Ram Dular Singh ,  Laxmikantha Reddy Ponnuru

IPC: H04L45/76 ,  H04L9/40 ,  H04L45/50 ,  H04L45/64

Abstract: According to some embodiments, a method is performed by a software defined wide area network (SD-WAN) edge router in a hierarchical SD-WAN network comprising a plurality of edge routers and a plurality of border routers. The method comprises: originating a SD-WAN system route for advertising reachability to the edge router, the system route comprising an encryption key associated with the edge router; and transmitting the system route to one or more SD-WAN border routers. The method may further comprise: receiving a packet destined for the edge router from one of the one or more SD-WAN border routers, wherein the packet is at least partially encrypted with the encryption key associated with the edge router; and decrypting the received packet.

公开(公告)号：US12113770B2

公开(公告)日：2024-10-08

申请号：US16737607

申请日：2020-01-08

Applicant: Cisco Technology, Inc.

Inventor： Manoj Pandey ,  Samir Thoria ,  Ali Sajassi

IPC: H04L61/5014 ,  H04L9/40 ,  H04L12/46 ,  H04L12/66 ,  H04L61/103 ,  H04L101/622

CPC classification number: H04L61/5014 ,  H04L12/4641 ,  H04L12/66 ,  H04L61/103 ,  H04L63/1466 ,  H04L2101/622

Abstract: This disclosure describes methods of operating a leaf node device, such as a switch device, connected to a switch fabric of a network. The leaf node device receives, from another leaf node device via the switch fabric, an indication of a secure route to a host device. In response to receiving the indication of the secure route, the leaf node device creates or updates a routing entry for the host device in a routing information base of the leaf node device and creates or updates an entry for the host device in a Dynamic Host Configuration Protocol (DHCP) snoop database of the leaf node device. The leaf node may thereby communicate with the host device that is attached to the leaf node device as a result of moving from the other leaf node device.

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：US11916786B2

公开(公告)日：2024-02-27

申请号：US17586204

申请日：2022-01-27

Applicant: Cisco Technology, Inc.

Inventor： Samir Thoria ,  Vivek Agarwal ,  Satish Kumar Mahadevan ,  Laxmikantha Reddy Ponnuru ,  Jean-Marc Barozet ,  Hamzah Kardame

IPC: H04L45/64 ,  H04L9/40 ,  H04L45/02 ,  H04L41/0894

CPC classification number: H04L45/64 ,  H04L41/0894 ,  H04L45/02 ,  H04L63/029

Abstract: According to some embodiments, a software defined wide area network (SD-WAN) includes a first region and a second region. The first region includes multiple first routing controllers and multiple first SD-WAN edge routers. The second region includes multiple second routing controllers and multiple second SD-WAN edge routers. Each first SD-WAN edge router of the first region is configured to establish Overlay Management Protocol (OMP) peering connections with the plurality of first routing controllers of the first region but to avoid establishing OMP peering connections with the plurality of second routing controllers of the second region. Each second SD-WAN edge router of the second region is configured to establish OMP peering connections with the plurality of second routing controllers of the second region but to avoid establishing OMP peering connections with the plurality of first routing controllers of the first region.