Patents by Inventor Dwight D. Jamieson
Dwight D. Jamieson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7831733Abstract: A method and system enables policy-based traffic forwarding in a data network by implementing policy-based control over propagation of LSA messages through the data network. A route tag is asserted in respect of a link state advertisement (LSA) message advertising a network address. Propagation of the LSA through the data network is controlled using the asserted internal route tag. At each hop, a policy decision affecting the forwarding of the LSA is made. Exemplary policy decisions include, Pass and Discard. In addition, the forwarding table may be updated using the route and address information contained in the LSA. In this case, routes entered in the forwarding table may be tagged as an inclusion route or an exclusion route. This may be based on the value of an exclusion route flag, which can, for example, be provided as a binary “0” or “1” inserted into an unused portion of the options field of the LSA.Type: GrantFiled: July 6, 2001Date of Patent: November 9, 2010Assignee: Avaya Holdings LimitedInventors: Nevein T. Sultan, Dwight D. Jamieson, Valerie A. Simpson
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Patent number: 7698464Abstract: In methods and apparatus for acquiring VPN reachability information at a node of a data network, a VPN reachability information request is transmitted from a requesting node. The VPN reachability information request comprises a VPN identifier. Other nodes of the data network receive the VPN reachability information request and, if they have reachability information relevant to that VPN, they transmit such information to the requesting node where it is received and stored. The invention can be used in MPLS VPN architectures.Type: GrantFiled: October 15, 2007Date of Patent: April 13, 2010Assignee: Avaya, Inc.Inventors: Dwight D. Jamieson, Rong R. Wang
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Patent number: 7415534Abstract: In methods and apparatus for acquiring VPN reachability information at a node of a data network, a VPN reachability information request is transmitted from a requesting node. The VPN reachabinty information request comprises a VPN identifier. Other nodes of the data network receive the VPN reachability information request and, if they have reachability information relevant to that VPN, they transmit such information to the requesting node where it is received and stored. The invention can be used in MPLS VPN architectures.Type: GrantFiled: November 1, 2004Date of Patent: August 19, 2008Assignee: Nortel Networks LimitedInventors: Dwight D. Jamieson, Rong R. Wang
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Publication number: 20080155121Abstract: In methods and apparatus for acquiring VPN reachability information at a node of a data network, a VPN reachability information request is transmitted from a requesting node. The VPN reachability information request comprises a VPN identifier. Other nodes of the data network receive the VPN reachability information request and, if they have reachability information relevant to that VPN, they transmit such information to the requesting node where it is received and stored. The invention can be used in MPLS VPN architectures.Type: ApplicationFiled: October 15, 2007Publication date: June 26, 2008Inventors: Dwight D. Jamieson, Rong R. Wang
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Patent number: 7296090Abstract: In methods and apparatus for acquiring VPN reachability information at a node of a data network, a VPN reachability information request is transmitted from a requesting node. The VPN reachability information request comprises a VPN identifier. Other nodes of the data network receive the VPN reachability information request and, if they have reachability information relevant to that VPN, they transmit such information to the requesting node where it is received and stored. The invention can be used in MPLS VPN architectures.Type: GrantFiled: November 1, 2004Date of Patent: November 13, 2007Assignee: Nortel Networks LimitedInventors: Dwight D. Jamieson, Rong R. Wang
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Patent number: 7234001Abstract: A method and apparatus provides protection against resource failures in Open Shortest Path First (OSPF) networks, without increasing the complexity of the network topology and/or management. An internal router (IR) automatically maintains a back-up link in a dormant state until a network failure affecting communications with a primary adjacent area border router (ABR) is detected. Upon detection of the network failure, the IR activates the back-up link in order to enable traffic flow to an alternate adjacent ABR, which by-passes the network failure. Upon recovery of communications with the primary adjacent ABR, the IR automatically deactivates the back-up link and resumes traffic flow through the primary adjacent ABR. As a result, traffic is forwarded into the back-up link only when communications with the primary adjacent ABR has failed, thereby maintaining simplicity in the network topology, and minimizing network management and administration requirements.Type: GrantFiled: December 20, 2000Date of Patent: June 19, 2007Assignee: Nortel Networks LimitedInventors: Valerie A. Simpson, Dwight D. Jamieson, Nevein T. Sultan
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Patent number: 7039687Abstract: A virtual private network enables private communications over a shared MPLS network between two or more private networks. The virtual private networks include a first router connected to the shared MPLS network and configured to dynamically distribute first router VPN information across the shared MPLS network. The first router VPN information includes a VPN identifier which is assigned to the first router. The VPN also includes a second router connected to the shared MPLS network and and configured to dynamically distribute second router VPN information across the shared MPLS network. The second router VPN information includes a VPN identifier which is assigned to the second router and which is identical to the VPN identifier assigned to the first router. The first and second routers are also configured to establish label switched paths therebetween.Type: GrantFiled: August 7, 1998Date of Patent: May 2, 2006Assignee: Nortel Networks LimitedInventors: Dwight D. Jamieson, Bilel N. Jamoussi, Paul J. Beaubien, Gregory V. Wright
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Patent number: 6813644Abstract: In methods and apparatus for acquiring VPN reachability information at a node of a data network, a VPN reachability information request is transmitted from a requesting node. The VPN reachability information request comprises a VPN identifier. Other nodes of the data network receive the VPN reachability information request and, if they have reachability information relevant to that VPN, they transmit such information to the requesting node where it is received and stored. The invention can be used in MPLS VPN architectures.Type: GrantFiled: November 17, 1999Date of Patent: November 2, 2004Assignee: Nortel Networks LimitedInventors: Dwight D. Jamieson, Rong R. Wang
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Publication number: 20030014540Abstract: A method and system enables policy-based traffic forwarding in a data network by implementing policy-based control over propagation of LSA messages through the data network. A route tag is asserted in respect of a link state advertisement (LSA) message advertising a network address. Propagation of the LSA through the data network is controlled using the asserted internal route tag. At each hop, a policy decision affecting the forwarding of the LSA is made. Exemplary policy decisions include, Pass and Discard. In addition, the forwarding table may be updated using the route and address information contained in the LSA. In this case, routes entered in the forwarding table may be tagged as an inclusion route or an exclusion route. This may be based on the value of an exclusion route flag, which can, for example, be provided as a binary “0” or “1” inserted into an unused portion of the options field of the LSA.Type: ApplicationFiled: July 6, 2001Publication date: January 16, 2003Applicant: Nortel Networks LimitedInventors: Nevein T. Sultan, Dwight D. Jamieson, Valerie A. Simpson
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Publication number: 20020078232Abstract: A method and apparatus provides protection against resource failures in Open Shortest Path First (OSPF) networks, without increasing the complexity of the network topology and/or management. An internal router (IR) automatically maintains a back-up link in a dormant state until a network failure affecting communications with a primary adjacent area border router (ABR) is detected. Upon detection of the network failure, the IR activates the back-up link in order to enable traffic flow to an alternate adjacent ABR, which by-passes the network failure. Upon recovery of communications with the primary adjacent ABR, the IR automatically deactivates the back-up link and resumes traffic flow through the primary adjacent ABR. As a result, traffic is forwarded into the back-up link only when communications with the primary adjacent ABR has failed, thereby maintaining simplicity in the network topology, and minimizing network management and administration requirements.Type: ApplicationFiled: December 20, 2000Publication date: June 20, 2002Applicant: Nortel Networks LimitedInventors: Valerie A. Simpson, Dwight D. Jamieson, Nevein T. Sultan