Chandarani J Mendon

US Patent:

8594082, Nov 26, 2013

Filed:

May 16, 2012

Appl. No.:

13/472964

Inventors:

Keshav Kamble - Fremont CA, US
Dayavanti G. Kamath - Santa Clara CA, US
Jayakrishna Kidambi - San Jose CA, US
Dar-Ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Vijoy Pandey - San Jose CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04L 12/58

US Classification:

370388, 37039521, 37039542, 370413

Abstract:

A switching network includes an upper tier and a lower tier including a plurality of lower tier entities. A master switch in the upper tier, which has a plurality of ports each coupled to a respective lower tier entity, implements on each of the ports a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier entity coupled to that port. Data traffic communicated between the master switch and RPIs is queued within virtual ports that correspond to the RPIs on lower tier entities with which the data traffic is communicated. The master switch enforces priority-based flow control (PFC) on data traffic of a given virtual port by transmitting, to a lower tier entity on which a corresponding RPI resides, a PFC data frame specifying priorities for at least two different classes of data traffic communicated by the particular RPI.

US Patent:

20120287785, Nov 15, 2012

Filed:

May 14, 2011

Appl. No.:

13/107895

Inventors:

Keshav Kamble - Fremont CA, US
Amitabha Biswas - San Francisco CA, US
Dar-ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Nilanjan Mukherjee - Santa Clara CA, US
Vijoy Pandey - San Jose CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - ARMONK NY

International Classification:

H04L 12/26
H04L 12/56

US Classification:

3702301, 370409, 370390, 370232

Abstract:

A switching network includes an upper tier having a master switch and a lower tier including a plurality of lower tier entities. The master switch, which has a plurality of ports each coupled to a respective lower tier entity, implements on each of the ports a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier entity coupled to that port. Data traffic communicated between the master switch and RPIs is queued within virtual ports that correspond to the RPIs with which the data traffic is communicated. The master switch applies data handling to the data traffic in accordance with a control policy based at least upon the virtual port in which the data traffic is queued, such that the master switch applies different policies to data traffic queued to two virtual ports on the same port of the master switch.

US Patent:

20120287786, Nov 15, 2012

Filed:

May 14, 2011

Appl. No.:

13/107893

Inventors:

Keshav Kamble - Fremont CA, US
Dayavanti G. Kamath - Santa Clara CA, US
Jayakrishna Kidambi - Santa Clara CA, US
Dar-ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Vijoy Pandey - San Jose CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - ARMONK NY

International Classification:

H04L 12/26

US Classification:

370235

Abstract:

A switching network includes an upper tier and a lower tier including a plurality of lower tier entities. A master switch in the upper tier, which has a plurality of ports each coupled to a respective lower tier entity, implements on each of the ports a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier entity coupled to that port. Data traffic communicated between the master switch and RPIs is queued within virtual ports that correspond to the RPIs on lower tier entities with which the data traffic is communicated. The master switch enforces priority-based flow control (PFC) on data traffic of a given virtual port by transmitting, to a lower tier entity on which a corresponding RPI resides, a PFC data frame specifying priorities for at least two different classes of data traffic communicated by the particular RPI.

US Patent:

20120320749, Dec 20, 2012

Filed:

Aug 27, 2012

Appl. No.:

13/594993

Inventors:

Keshav Kamble - Fremont CA, US
Amitabha Biswas - San Francisco CA, US
Dar-ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Nilanjan Mukherjee - Santa Clara CA, US
Vijoy Pandey - San Jose CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - ARMONK NY

International Classification:

H04L 12/24
H04L 12/56

US Classification:

370235, 370390, 370409

Abstract:

A switching network includes an upper tier having a master switch and a lower tier including a plurality of lower tier entities. The master switch, which has a plurality of ports each coupled to a respective lower tier entity, implements on each of the ports a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier entity coupled to that port. Data traffic communicated between the master switch and RPIs is queued within virtual ports that correspond to the RPIs with which the data traffic is communicated. The master switch applies data handling to the data traffic in accordance with a control policy based at least upon the virtual port in which the data traffic is queued, such that the master switch applies different policies to data traffic queued to two virtual ports on the same port of the master switch.

US Patent:

20130201873, Aug 8, 2013

Filed:

Feb 2, 2012

Appl. No.:

13/364896

Inventors:

Sushma Anantharam - Cupertino CA, US
Nirapada Ghosh - Sunnyvale CA, US
Keshav Govind Kamble - Fremont CA, US
Dar-Ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Vijoy A. Pandey - San Jose CA, US
Nandakumar Peethambaram - Santa Clara CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H04L 12/28

US Classification:

370255

Abstract:

A distributed fabric system comprises a plurality of independent network elements interconnected by inter-switch links and assigned to a same group. Each network element includes a switching chip, a processor, and memory storing program code that is executed by the processor. The program code of each network element includes a device configuration (DC) stacking module and a switch discovery protocol (SDP) module. The SDP module of each network element, when executed, discovers each other network element in the group and elects one of the network elements as a master network element. The SDP module of the master network element, when executed, sends messages to the DC-stacking module of the master network element. Each sent message identifies one of the network elements in the group. The DC stacking module of the master network element, when executed, maintains a record of all network elements that are currently members in the group.

US Patent:

20130201875, Aug 8, 2013

Filed:

Apr 23, 2012

Appl. No.:

13/453644

Inventors:

Sushma Anantharam - Cupertino CA, US
Nirapada Ghosh - Sunnyvale CA, US
Keshav Govind Kamble - Fremont CA, US
Dar-Ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Vijoy A. Pandey - San Jose CA, US
Nandakumar Peethambaram - Santa Clara CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H04L 12/28

US Classification:

370255

Abstract:

A distributed fabric system comprises a plurality of independent network elements interconnected by inter-switch links and assigned to a same group. Each network element includes a switching chip, a processor, and memory storing program code that is executed by the processor. The program code of each network element includes a device configuration (DC) stacking module and a switch discovery protocol (SDP) module. The SDP module of each network element, when executed, discovers each other network element in the group and elects one of the network elements as a master network element. The SDP module of the master network element, when executed, sends messages to the DC-stacking module of the master network element. Each sent message identifies one of the network elements in the group. The DC stacking module of the master network element, when executed, maintains a record of all network elements that are currently members in the group.

US Patent:

20130235735, Sep 12, 2013

Filed:

Mar 7, 2012

Appl. No.:

13/414684

Inventors:

Sushma Anantharam - Cupertino CA, US
Nirapada Ghosh - Sunnyvale CA, US
Keshav Govind Kamble - Fremont CA, US
Dar-Ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Nilanjan Mukherjee - Santa Clara CA, US
Vijoy Pandey - San Jose CA, US
Nandakumar Peethambaram - Santa Clara CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H04L 12/28
H04L 12/26

US Classification:

370250, 370254

Abstract:

A distributed fabric system has distributed line card (DLC) chassis and scaled-out fabric coupler (SFC) chassis. Each DLC chassis includes a network processor and fabric ports. Each network processor of each DLC chassis includes a fabric interface in communication with the DLC fabric ports of that DLC chassis. Each SFC chassis includes a fabric element and fabric ports. A communication link connects each SFC fabric port to one DLC fabric port. Each communication link includes cell-carrying lanes. Each fabric element of each SFC chassis collects per-lane statistics for each SFC fabric port of that SFC chassis. Each SFC chassis includes program code that obtains the per-lane statistics collected by the fabric element chip of that SFC chassis. A network element includes program code that gathers the per-lane statistics collected by each fabric element of each SFC chassis and integrates the statistics into a topology of the entire distributed fabric system.

US Patent:

20130235762, Sep 12, 2013

Filed:

Mar 7, 2012

Appl. No.:

13/414677

Inventors:

Sushma Anantharam - Cupertino CA, US
Nirapada Ghosh - Sunnyvale CA, US
Dayavanti Gopal Kamath - Santa Clara CA, US
Keshav Govind Kamble - Fremont CA, US
Dar-Ren Leu - San Jose CA, US
Chandarani J. Mendon - San Jose CA, US
Vijoy Pandey - San Jose CA, US
Nandakumar Peethambaram - Santa Clara CA, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

H04L 12/28

US Classification:

370255, 370254

Abstract:

A distributed fabric system has distributed line card (DLC) chassis and scaled-out fabric coupler (SFC) chassis. Each DLC includes a network processor and fabric ports. Each network processor of each DLC includes a fabric interface in communication with the fabric ports of that DLC. Each SFC includes at least one fabric element and SFC fabric ports. A fabric communication link connects each SFC fabric port to one DLC fabric port. Each fabric communication link includes cell-carrying lanes. Each fabric element of each SFC detects connectivity between each SFC fabric port of that SFC and one DLC fabric port over a fabric communication link. Each SFC includes program code that reads connectivity matrix from fabric element chips and sends connection information corresponding to the detected connectivity from that SFC to a central agent. A network element includes the central agent, which, when executed, constructs a topology of the distributed fabric system from the connection information sent from each SFC.