公开(公告)号：US11711230B2

公开(公告)日：2023-07-25

申请号：US17380700

申请日：2021-07-20

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Chethan Chavadibagilu Radhakrishnabhat ,  Subramanian Muthukumar

IPC: H04L12/18 ,  H04L45/16 ,  H04L12/46 ,  H04L49/00 ,  H04L45/64

CPC classification number: H04L12/185 ,  H04L12/4633 ,  H04L45/16 ,  H04L45/64 ,  H04L49/70

Abstract: A system for multicast packet management in a first switch in an overlay tunnel fabric is provided. The system can operate the first switch as part of a virtual switch in conjunction with a second switch of the fabric. The virtual switch can operate as a gateway for the fabric. During operation, the system can receive a join request for a multicast group. The system can then determine whether to forward the join request to the second switch based on a type of a first ingress connection of the join request. Upon receiving a data packet for the multicast group, the system can determine how to forward the data packet based on respective types of a second ingress connection and an egress connection of the data packet. The type of a respective connection can indicate whether the connection includes an overlay tunnel.

公开(公告)号：US11153213B2

公开(公告)日：2021-10-19

申请号：US16866690

申请日：2020-05-05

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Abhishek Srivastava ,  Madhusoodhana Chari Sesha

IPC: H04L12/803 ,  H04L12/851 ,  H04J3/06 ,  H04L12/727 ,  H04L12/707

Abstract: Examples include generating a Precision Time Protocol (PTP) packet for a first nexthop in an Equal Cost Multi-Path set and sending the PTP packet to the first nexthop. Examples also include receiving a response from the first nexthop that identifies a time delay associated with a route to the first nexthop and updating the ECMP based on the time delay.

公开(公告)号：US20210320837A1

公开(公告)日：2021-10-14

申请号：US17221806

申请日：2021-04-04

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Tathagata Nandy ,  Subramanian Muthukumar

IPC: H04L12/24 ,  H04L12/751 ,  H04L12/18

Abstract: The present disclosure relates a system and a method of identifying network faults residing in an underlay network. A network device initiating fault analysis sends a query message through a tunnel interface present in an overlay network configured over an underlay network. While an upstream interface is a network tunnel having a first end and a second end, a unicast path from the first end to the second end of the network tunnel is traced using a network route analysis function. Reachability of a destination device present on the second end of the network tunnel is identified. An output of the network route analysis function is appended with an output of a multicast network connectivity determining function to produce an appended result that is shared with the network device initiating fault analysis.

公开(公告)号：US20200287734A1

公开(公告)日：2020-09-10

申请号：US16807645

申请日：2020-03-03

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： Tathagata Nandy ,  Chethan Chavadibagilu Radhakrishna Bhat ,  Utkarsh Srivastava

IPC: H04L12/18 ,  H04L12/775 ,  H04L12/751 ,  H04L12/851 ,  H04L29/06 ,  H04L12/707

Abstract: An example system includes a network having interconnected routers, a multicast source to transmit data through the network for receipt by receiving host devices, and a query agent communicatively coupled to each router of the interconnected routers. The query agent is to generate a flow tree for multicasting of the data from the multicast source to each receiving host device, the flow tree including flow paths from the multicast source to each receiving host device, query each router to determine a status of at least one flow path of the flow tree, and identify an anomaly associated with at least one router in the at least one flow path.

公开(公告)号：US10666558B2

公开(公告)日：2020-05-26

申请号：US15866824

申请日：2018-01-10

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Nilay Tripathi ,  Sarita Patra

IPC: H04L12/753 ,  H04L12/24 ,  H04L12/18 ,  H04L12/773 ,  H04L12/751 ,  H04L12/66 ,  H04L12/775 ,  H04L12/761 ,  H04L12/26

Abstract: In example implementations, a method is provided. The method detects, by a processor, an assignment of a master router role for a virtual router redundancy protocol (VRRP), a protocol independent multicast (PIM) designated router (DR) role for a PIM protocol, and a querier router role for an internet group management protocol (IGMP) to different routers in a network. A communication procedure is initiated to identify which routers of the routers are assigned to the master router role, the DR role and the querier router role. The master router role, the DR role and the querier router role are then automatically aligned to a single router of the routers via an ordered communication exchange.

公开(公告)号：US10594558B2

公开(公告)日：2020-03-17

申请号：US16005899

申请日：2018-06-12

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Balaji Sankaran ,  Vijay Kannan ,  Guru Gurram Janardhan

IPC: H04L12/24 ,  H04L12/18 ,  H04L12/26 ,  H04L12/753 ,  H04L12/751

Abstract: Some examples relate to auto-configuration of a parameter related to a multicast protocol on a network device. In an example, a network device in a multicast network may identify the network topology of the multicast network. Upon identification, the network device may enable a multicast protocol on the network device based on the network topology of the multicast network. The network device may determine a network parameter related to the multicast network. In response to the determination, a multicast parameter related to the multicast protocol may be auto-configured on the network device.

公开(公告)号：US20200067808A1

公开(公告)日：2020-02-27

申请号：US16108836

申请日：2018-08-22

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Rajib Majila

IPC: H04L12/26 ,  H04L12/751

Abstract: Examples disclosed herein relate to monitoring flow activity on a network device. In an example, a neighbor table is maintained on a network device. The neighbor table may include a record of a neighbor network device and a hit bit corresponding to the neighbor network device. The hit bit may be used to represent a flow activity of the neighbor network device. A determination may be made whether a status of the hit bit corresponding to the neighbor network device is inactive. If the status of the hit bit is inactive, a flow entry corresponding to the neighbor network device may be deleted from an ASIC table on the network device.

公开(公告)号：US12273219B2

公开(公告)日：2025-04-08

申请号：US18072019

申请日：2022-11-30

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Chethan Chavadibagilu Radhakrishnabhat ,  Thomas Samuel ,  Priyam De

IPC: H04L12/46 ,  H04L45/02 ,  H04L45/16

Abstract: A system for efficient multicast control packet forwarding is provided. During operation, the system can maintain a first tunnel between a first switch and a second switch in an overlay tunnel fabric. The encapsulation of a packet sent via the overlay tunnel fabric is initiated and terminated within the overlay tunnel fabric. The system can maintain a second tunnel between the first switch and a third switch, which can be in an external network that excludes the first and second switches. The switch can distinguish the first and second tunnels as intra-fabric and inter-fabric tunnels, respectively. Upon receiving a multicast control packet via the first tunnel, the system can identify the second tunnel as the inter-fabric tunnel and forward the multicast control packet via the second tunnel. Here, a respective multicast control packet received from the first tunnel can be precluded from being forwarded on intra-fabric tunnels.

公开(公告)号：US20250047517A1

公开(公告)日：2025-02-06

申请号：US18362710

申请日：2023-07-31

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Deepak S. Kudachi ,  Tathagata Nandy ,  Chethan Chavadibagilu Radhakrishnabhat

IPC: H04L12/18

Abstract: A switch receives a first query which requests a response from all hosts in the network, wherein the switch is a next-hop switch of a first set of the hosts in a multicast group, wherein the first query is an Internet Group Management Protocol (IGMP) all-host query message, and wherein the first query is generated by an IGMP querying host and transmitted via one or more intermediate switches. The switch tracks join messages received from the first set of the hosts in response to the first query, wherein a respective join message indicates that a corresponding host is to remain in the multicast group. Responsive to determining that the tracked join messages meet a predetermined threshold, the switch consolidates the tracked join messages by forwarding a reduced number of join messages, thereby reducing a total number of join messages propagated to the IGMP querying host via the intermediate switches.

公开(公告)号：US12132643B1

公开(公告)日：2024-10-29

申请号：US18211467

申请日：2023-06-19

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Tathagata Nandy ,  Subramanian Muthukumar

IPC: G06F15/16 ,  H04L45/00 ,  H04L45/16 ,  H04L45/42

CPC classification number: H04L45/16 ,  H04L45/42 ,  H04L45/566

Abstract: During operation, a layer-3 (L3) router can receive a trace query to trace multicast paths associated with a multicast group. In response to detecting a layer-2 (L2) switch coupled to the L3 router, the L3 router can construct a request packet and send the request packet to the coupled L2 switch. The request packet comprises a first data block indicating that the request packet is an L2 multicast trace request, thereby causing the L2 switch to propagate the request packet to downstream L2 switches until the request packet reaches a last-hop L2 switch. The L3 router can receive, from the last-hop L2 switch, a reply packet responsive to the L2 multicast trace request, the reply packet comprising one or more data blocks, with each data block comprising information about an L2 switch or client device present on a traversed multicast path for the multicast group.