Sathish K Gnanasekaran

US Patent:

8081642, Dec 20, 2011

Filed:

Jan 31, 2003

Appl. No.:

10/356392

Inventors:

Christopher A. Del Signore - San Jose CA, US
Vineet M. Abraham - San Jose CA, US
Sathish K. Gnanasekaran - San Jose CA, US
Pranab Patnaik - Sunnyvale CA, US
Vincent W. Guan - Saratoga CA, US
Balakumar N. Kaushik - Sunnyvale CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04L 12/56

US Classification:

370401

Abstract:

An interfabric link between two separate Fibre Channel fabrics so that devices in one fabric can communicate with devices in another fabric without requiring the merger of the two fabrics. The interfabric switch performs a conversion or a translation of device addresses in each fabric so that they are accessible to the other fabric. This translation is preferably done using a private to public loop address translation. In a first embodiment the external ports of the interfabric switch are configured as E_ports. A series of internal ports in each interfabric switch are joined together forming a series of virtual or logical switches. The virtual switches are then interconnected using private loops. The use of the private loop is enabled by the presence of translation logic which converts fabric addresses to loop addresses and back so that loop and fabric devices can communicate. Because each port can do this translation and the private loop addressing does not include domain or area information, the change in addresses between the fabrics is simplified.

US Patent:

8160072, Apr 17, 2012

Filed:

Dec 11, 2009

Appl. No.:

12/636591

Inventors:

Sathish K. Gnanasekaran - Sunnyvale CA, US
Ponpandiaraj Rajarathinam - Sunnyvale CA, US
Vineet M. Abraham - Sunnyvale CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04L 12/28

US Classification:

370392, 370229, 370389, 370235, 370468

Abstract:

One embodiment of the present invention provides a system that facilitates end-to-end quality of service (QoS) between a source and a destination in a network. During operation, the system allocates virtual channels on an output port of a switch to a number of quality of service (QoS) levels. The system further assigns a virtual channel to a traffic flow based on a QoS zone, wherein the QoS zone is identified by a host identifier, a target identifier, and a QoS level of the traffic flow. In addition, the system forwards data frames in the traffic flow via the assigned virtual channel.

US Patent:

8339994, Dec 25, 2012

Filed:

Aug 27, 2009

Appl. No.:

12/549271

Inventors:

Sathish Kumar Gnanasekaran - San Jose CA, US
Shashank R. Tadisina - San Jose CA, US
Subramanian Lakshmanan - San Jose CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04L 12/28
G06F 15/173
G06F 15/177

US Classification:

370254, 709220, 709242

Abstract:

A Layer 2 network switch fabric is partitionable into a plurality of virtual fabrics. A network switch chassis is partitionable into a plurality of logical switches, each of which may be associated with one of the virtual fabrics, including a base switch. Logical switches in multiple network switch chassis are connected by logical connections, such as logical inter-switch links that use physical connections, such as extended inter-switch links between base switches, for data transport. A topology of logical connections is established that balances competing metrics, such as robustness and scalability, while maintaining alignment with the topology of the physical connections. A topology factor allows establishing different topologies with different balances between the competing metrics.

US Patent:

8498213, Jul 30, 2013

Filed:

Sep 14, 2010

Appl. No.:

12/881949

Inventors:

Sathish Kumar Gnanasekaran - Sunnyvale CA, US
Rishi Sinha - San Jose CA, US
Michael Gee - San Jose CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04J 3/14
H04L 12/28

US Classification:

370242, 370248, 370252, 370412

Abstract:

Manageability tools are provided for allowing an administrator to have better control over switches in a lossless network of switches. These tools provide the ability to detect slow drain and congestion bottlenecks, detect stuck virtual channels and loss of credits, while hold times on edge ASICs to be different from hold times encore ASICs, and mitigate severe latency bottlenecks.

US Patent:

8542583, Sep 24, 2013

Filed:

Sep 14, 2010

Appl. No.:

12/881962

Inventors:

Sathish Kumar Gnanasekaran - Sunnyvale CA, US
Dennis Hideo Makishima - Mountain View CA, US
Abhijit Seal - San Jose CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04L 12/26

US Classification:

370230, 370235

Abstract:

Manageability tools are provided for allowing an administrator to have better control over switches in a lossless network of switches. These tools provide the ability to detect slow drain and congestion bottlenecks, detect stuck virtual channels and loss of credits, while hold times on edge ASICs to be different from hold times encore ASICs, and mitigate severe latency bottlenecks.

US Patent:

8582432, Nov 12, 2013

Filed:

Apr 21, 2010

Appl. No.:

12/764849

Inventors:

Amit Kanda - San Jose CA, US
Sathish Kumar Gnanasekaran - Santa Clara CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04L 12/26

US Classification:

370235

Abstract:

A port monitor monitors network traffic that passes through a port of a switch. Frame flows routed through the switch are counted by hardware frame counting logic, which includes a content-addressable memory (CAM) and counters corresponding to various frame flows. Port monitor software includes logical containers (“buckets”), which are used to record and sort counts of the frame flows from hardware based on activity of the frame flows. Frame flow sorting is based on confidence building algorithms such that the thrashing of frame flows between buckets is reduced. Storage and sorting of the frame flows in software allows the activity level of any number of frame flows associated with the switch to be counted, regardless of hardware limitations on how many frame flows can be counted. This allows a real-time analysis of frame flows and a determination of frame flows that are major users of Fiber Channel bandwidth.

US Patent:

8588075, Nov 19, 2013

Filed:

Sep 14, 2010

Appl. No.:

12/881935

Inventors:

Sathish Kumar Gnanasekaran - Sunnyvale CA, US
Rishi Sinha - San Jose CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

H04J 1/16
H04L 12/28

US Classification:

370236, 370412

Abstract:

Manageability tools are provided for allowing an administrator to have better control over switches in a lossless network of switches. These tools provide the ability to detect slow drain and congestion bottlenecks, detect stuck virtual channels and loss of credits, configure hold times on edge ASICs to be different from hold times on core ASICs, and mitigate severe latency bottlenecks.

US Patent:

8593964, Nov 26, 2013

Filed:

Nov 6, 2009

Appl. No.:

12/614256

Inventors:

Rishi Sinha - San Jose CA, US
Vineet Abraham - Sunnyvale CA, US
Sathish K. Gnanasekaran - Sunnyvale CA, US
Badrinath Kollu - San Jose CA, US

Assignee:

Brocade Communications Systems, Inc. - San Jose CA

International Classification:

G01R 31/08

US Classification:

370235

Abstract:

One embodiment of the present invention provides a system that facilitates traffic management in a network. During operation, the system detects a bottleneck in a network based on network-state information received from one or more switches. The system further identifies a data flow that contributes to the bottleneck and generates a signal to reduce the data flow from the data flow's source device.