Anand P Singh

US Patent:

20230030452, Feb 2, 2023

Filed:

Jul 21, 2021

Appl. No.:

17/381552

Inventors:

- San Jose CA, US
Rishi Chhibber - Dublin CA, US
Anand Kumar Singh - Cupertino CA, US

International Classification:

H04L 12/851
H04L 12/823
H04L 12/825

Abstract:

Techniques are described for an adaptive CoPP that can adapt and change based on actual network control traffic rather than static CoPP rates. An aggressive CoPP can protect the CPU (route processor) of a network device, e.g., routers and switches, but may also penalize convergence and performance. An adaptive CoPP may protect CPU as well as boost convergence and performance parameters. In particular, traffic between two sites may be managed by proactively changing the thresholds of lower CoS traffic based on the CoPP utilization of various protocol/BPDU class traffic, thereby improving data plane convergence and application performance in scaled environments.

US Patent:

20200382242, Dec 3, 2020

Filed:

May 31, 2019

Appl. No.:

16/428203

Inventors:

- San Jose CA, US
Rishi CHHIBBER - Dublin CA, US
Peter PSENAK - Bratislava, SK
Padmanab PATHIKONDA - Mountain House CA, US
Francesco MEO - San Jose CA, US
Anand Kumar SINGH - Cupertino CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04L 1/12
H04L 1/18
H04L 12/18

Abstract:

Multicast error detection and recovery may be provided. A join request for a multicast stream may be sent from a first network node to a second network node. The join request may be sent over a first link of a plurality of links between the first network node and the second network node. A redirect message indicating that the second network node cannot accommodate the join request may be received by the first network node from the second network node. In response to receiving the redirect message, the join request for the multicast stream may not be sent on a second link of the plurality of links by the first network node to the second network node. And in response to receiving the redirect message, an alternate upstream network node may be determined by the first network node to send the join request for the multicast stream to.

US Patent:

20200028774, Jan 23, 2020

Filed:

Jul 23, 2018

Appl. No.:

16/042870

Inventors:

- San Jose CA, US
RISHI CHHIBBER - Dublin CA, US
ROSHAN LAL - San Jose CA, US
ANN ROSHINI PAUL - San Jose CA, US
ANAND KUMAR SINGH - Cupertino CA, US
NATARAJ BATCHU - Sunnyvale CA, US

International Classification:

H04L 12/761

Abstract:

In one illustrative example, an IP network media data router includes a spine and leaf switch architecture operative to provide IP multicast delivery of media data from source devices to receiver devices without the overhead communication with a controller. The architecture can include K spine switches, K sets of L leaf switches, M data links between each leaf switch, and a plurality of bidirectional data ports connected to each leaf switch for a guaranteed non-blocking IP multicast delivery of data. A deterministic hash function a used on both the first hop router and the last hop router to ensure the same spine node is selected for flow stitching. Accordingly, without the extra communication with a centralized controller, the right spine for establishing a multicast flow can be chosen using the deterministic hash function and the distributed resource information stored on each node.

US Patent:

20190036809, Jan 31, 2019

Filed:

Sep 19, 2018

Appl. No.:

16/135926

Inventors:

- San Jose CA, US
Venkatesh Srinivasan - San Jose CA, US
Swaminathan Narayanan - San Jose CA, US
Ambrish Niranjan Mehta - Milpitas CA, US
Anand Kumar Singh - San Jose CA, US
Anulekha Chodey - San Jose CA, US

International Classification:

H04L 12/705
H04L 12/703
H04L 12/931
H04L 29/08
H04L 5/00
H04L 12/26
H04L 12/46
H04L 12/721
H04L 12/753
H04L 29/12
H04L 12/437

Abstract:

Systems, methods, and non-transitory computer-readable storage media for detecting network loops. In some embodiments, a system can identify a port that is in a blocking state. The blocking state can be for dropping one or more types of packets and preventing the port from forwarding the one or more types of packets. The system can determine a number of packets transmitted through the port by a hardware layer on the system and a number of control packets transmitted through the port by a software layer on the system. The system can determine whether the number of packets is greater than the number of control packets. When the number of packets is greater than the number of control packets, the system can determine that the blocking state has failed to prevent the port from forwarding the one or more types of packets.

US Patent:

20190020575, Jan 17, 2019

Filed:

Sep 17, 2018

Appl. No.:

16/133439

Inventors:

- San Jose CA, US
Venkatesh Srinivasan - San Jose CA, US
Swaminathan Narayanan - San Jose CA, US
Ambrish Niranjan Mehta - Milpitas CA, US
Anand Kumar Singh - San Jose CA, US
Anulekha Chodey - San Jose CA, US

International Classification:

H04L 12/705
H04L 12/703
H04L 29/12
H04L 12/753
H04L 12/721
H04L 12/46
H04L 12/26
H04L 5/00
H04L 29/08
H04L 12/931
H04L 12/437

Abstract:

Systems, methods, and computer-readable storage media for detecting network loops. A system can identify, for each virtual tunnel endpoint (VTEP) from multiple VTEPs in a network, respective media access control address data including the respective local interface media access control addresses of the respective VTEP and respective media access control addresses learned by the respective VTEP. The system can determine whether the VTEPs are running spanning tree protocol (STP), and whether a media access control address learned by a first VTEP matches a respective local interface media access control address of a second VTEP. The system can detect a loop when the media access control address learned by the first VTEP matches the respective local interface media access control address of the second VTEP. The system can also detect a loop when the VTEPs are running STP and the first and second VTEPs see the same STP root bridge.

US Patent:

20180026810, Jan 25, 2018

Filed:

Aug 9, 2016

Appl. No.:

15/232591

Inventors:

- San Jose CA, US
Venkatesh Srinivasan - San Jose CA, US
Swaminathan Narayanan - San Jose CA, US
Ambrish Niranjan Mehta - San Jose CA, US
Anand Kumar Singh - San Jose CA, US
Anulekha Chodey - San Jose CA, US

International Classification:

H04L 12/437
H04L 12/46
H04L 5/00

Abstract:

Systems, methods, and non-transitory computer-readable storage media for detecting network loops. In some embodiments, a system can identify a network path having multiple hops associated with respective nodes which are configured in a forwarding mode. The system can traverse the network path to identify, for each node from the respective nodes, a respective next hop. Based on the respective next hop for each node, the system can determine whether two or more nodes from the respective nodes have a same respective next hop. When the two or more nodes have the same respective next hop, the system can determine that the network path has a network loop.

US Patent:

20180026871, Jan 25, 2018

Filed:

Jul 21, 2016

Appl. No.:

15/216666

Inventors:

- San Jose CA, US
Venkatesh Srinivasan - San Jose CA, US
Swaminathan Narayanan - San Jose CA, US
Ambrish Niranjan Mehta - San Jose CA, US
Anand Kumar Singh - San Jose CA, US
Anulekha Chodey - San Jose CA, US

International Classification:

H04L 12/705
H04L 12/26
H04L 29/08
H04L 12/931

Abstract:

Systems, methods, and non-transitory computer-readable storage media for detecting network loops. In some embodiments, a system can identify a port that is in a blocking state. The blocking state can be for dropping one or more types of packets and preventing the port from forwarding the one or more types of packets. The system can determine a number of packets transmitted through the port by a hardware layer on the system and a number of control packets transmitted through the port by a software layer on the system. The system can determine whether the number of packets is greater than the number of control packets. When the number of packets is greater than the number of control packets, the system can determine that the blocking state has failed to prevent the port from forwarding the one or more types of packets.

US Patent:

20180026872, Jan 25, 2018

Filed:

Aug 9, 2016

Appl. No.:

15/232655

Inventors:

- San Jose CA, US
Venkatesh Srinivasan - San Jose CA, US
Swaminathan Narayanan - San Jose CA, US
Ambrish Niranjan Mehta - San Jose CA, US
Anand Kumar Singh - San Jose CA, US
Anulekha Chodey - San Jose CA, US

International Classification:

H04L 12/705
H04L 12/721
H04L 12/753
H04L 29/12
H04L 12/46

Abstract:

Systems, methods, and computer-readable storage media for detecting network loops. A system can identify, for each virtual tunnel endpoint (VTEP) from multiple VTEPs in a network, respective media access control address data including the respective local interface media access control addresses of the respective VTEP and respective media access control addresses learned by the respective VTEP. The system can determine whether the VTEPs are running spanning tree protocol (STP), and whether a media access control address learned by a first VTEP matches a respective local interface media access control address of a second VTEP. The system can detect a loop when the media access control address learned by the first VTEP matches the respective local interface media access control address of the second VTEP. The system can also detect a loop when the VTEPs are running STP and the first and second VTEPs see the same STP root bridge.