David Kwo Tsang

US Patent:

7869442, Jan 11, 2011

Filed:

Sep 30, 2005

Appl. No.:

11/241612

Inventors:

Ameel Kamboh - Billerica MA, US
David Tsang - Sudbury MA, US

Assignee:

Nortel Networks Limited - Mississauga, Ontario

International Classification:

H04L 12/56

US Classification:

370400, 726 1, 726 3

Abstract:

IP applications may be hosted on processors other than the processor on which their associated routing entity is hosted by causing the routing context to be extended to the new processor and causing IP termination to occur at the new processor. Applications may define policies specifying packet attributes and actions to be taken on matching packets, so that packets matching the policy may be directed to a processor hosting the application rather than a processor hosting the routing entity. A steering policy manager may be implemented to receive policies from the applications, verify the policy format and uniqueness vis-à-vis previously implemented policies, and implement the policies by passing the policies to one or more steering policy agents. Filters may be programmed into the data plane or the control plane to cause IP termination to occur on the processor hosting the application.

US Patent:

20080101241, May 1, 2008

Filed:

Mar 16, 2007

Appl. No.:

11/724981

Inventors:

Dinesh Mohan - Kanata, CA
Christopher Monti - Tyngsboro MA, US
Piotr Romanus - Andover MA, US
David Tsang - Sudbury MA, US
Michael Chen - Chapel Hill NC, US

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04L 12/26

US Classification:

3702362, 370392

Abstract:

OAM may be implemented at an intermediate node on a PBT trunk in an Ethernet network by causing OAM frames to be addressed to the PBT trunk endpoint but causing the OAM frames to carry an indicia (Ether-type, OpCode, TLV value or combination of these and other fields) that the OAM frames are intended to be used for intermediate node OAM functions. The Ether-type, OpCode, and TLV values may be standardized values, or vendor specific values such as OpCode=51 or TLV=31 may be used. Addressing the OAM frames to the PBT trunk end point enables the OAM frames to follow the PBT trunk through the network. The OAM indicia signals to the intermediate nodes that the OAM frames are intended to be used to perform an intermediate node OAM function. The OAM frames may contain reverse trunk information to prevent the intermediate nodes from being required to store correlation between forward and reverse PBT trunks.

US Patent:

20110080907, Apr 7, 2011

Filed:

Dec 13, 2010

Appl. No.:

12/966733

Inventors:

Ameel Kamboh - Billerica MA, US
David Tsang - Sudbury MA, US

International Classification:

H04L 12/56

US Classification:

370389

Abstract:

IP applications may be hosted on processors other than the processor on which their associated routing entity is hosted by causing the routing context to be extended to the new processor and causing IP termination to occur at the new processor. Applications may define policies specifying packet attributes and actions to be taken on matching packets, so that packets matching the policy may be directed to a processor hosting the application rather than a processor hosting the routing entity. A steering policy manager may be implemented to receive policies from the applications, verify the policy format and uniqueness vis-à-vis previously implemented policies, and implement the policies by passing the policies to one or more steering policy agents. Filters may be programmed into the data plane or the control plane to cause IP termination to occur on the processor hosting the application.

US Patent:

20200349020, Nov 5, 2020

Filed:

Apr 30, 2019

Appl. No.:

16/398879

Inventors:

- Hopkinton MA, US
David T. Tsang - Sudbury MA, US
Michael Ferrari - Douglas MA, US
Jeffrey Wilson - Franklin MA, US
Mark J. Halstead - Holliston MA, US

International Classification:

G06F 11/14
G06F 3/06

Abstract:

An apparatus in one embodiment comprises at least one processing device having a processor coupled to a memory. The processing device is configured to maintain, for logical storage volumes of a storage system, device sequence numbers for snapshot and extent copy operations. The processing device is also configured to maintain, for at least one track of the logical storage volumes, a track sequence number representing the state of the track with respect to the snapshot and extent copy operations. The processing device is further configured to receive input/output operations directed to the logical storage volumes from host devices coupled to the storage system while at least one snapshot or extent copy operation for the logical storage volumes is in progress, and to utilize the track sequence numbers and the device sequence numbers to determine processing of the received input/output operations while the snapshot or extent copy operations are in progress.