Joint IP/optical layer restoration after a router failure

Patent metadata

Field	Value
Publication number	US-9705590-B2
Application number	US-201514693160-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	Jul 20, 2000
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A method and system for providing joint IP/Optical Layer restoration mechanisms for the IP over Optical Layer architecture, particularly for protecting against router failure within such architecture, includes any one of plural node elements participating in the detection and restoration of the joint IP/Optical Layer architecture upon the failure of a router in one of the nodes. The plural node elements may include, but are not limited to, one of plural routers and an optical cross-connect.

First claim

What is claimed is:

1. A method for restoring Internet protocol service after failure of a first Internet protocol layer router located in a first network office, the first network office including a first optical layer element connected directly with the first Internet protocol layer router, the method comprising:
by the first optical layer element, detecting the failure of the first Internet protocol layer router; and
by the first optical layer element, transmitting a request to a second optical layer element in a second network office to coordinate replacement of a link for Internet protocol traffic to the failed first Internet protocol layer router with a new link for Internet protocol traffic to a redundant Internet protocol layer router co-located in the first network office, the new link to the redundant Internet protocol layer router using an inter-office optical connection between the first optical layer element and the second optical layer element.

2. The method of claim 1 , wherein transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a port on a second Internet protocol layer router in the second network office formerly used in a link between the second Internet protocol layer router and the failed first Internet protocol layer router.

3. The method of claim 1 , wherein transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a spare port on the redundant Internet protocol layer router.

4. The method of claim 1 , wherein transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a port on the redundant Internet protocol layer router formerly used in a link between the failed first Internet protocol layer router and the redundant Internet protocol layer router.

5. The method of claim 1 , wherein the first optical layer element controls connections for multiple Internet protocol layer routers located in the first network office.

6. The method of claim 1 , wherein transmitting a request to the second optical layer element to coordinate replacement of the link further comprises transmitting instructions to use an application programming interface call to create the link.

7. A computer-readable storage device having stored thereon computer readable instructions for restoring Internet protocol service after failure of a first Internet protocol layer router located in a first network office, the first network office including a first optical layer element connected directly with the first Internet protocol layer router, wherein execution of the computer readable instructions by a processor of the first optical layer element causes the first optical layer element to perform operations comprising:
detecting the failure of the first Internet protocol layer router; and
transmitting a request to a second optical layer element in a second network office to coordinate replacement of a link for Internet protocol traffic to the failed first Internet protocol layer router with a new link for Internet protocol traffic to a redundant Internet protocol layer router co-located in the first network office, the new link to the redundant Internet protocol layer router using an inter-office optical connection between the first optical layer element and the second optical layer element.

8. The computer-readable storage device of claim 7 , wherein transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a port on a second Internet protocol layer router in the second network office formerly used in a link between the second Internet protocol layer router and the failed first Internet protocol layer router.

9. The computer-readable storage device of claim 7 , transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a spare port on the redundant Internet protocol layer router.

10. The computer-readable storage device of claim 7 , wherein transmitting a request to coordinate replacement of a link to the failed first Internet protocol router with a new link further comprises:
transmitting the request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a port on the redundant Internet protocol layer router formerly used in a link between the failed first Internet protocol layer router and the redundant Internet protocol layer router.

11. The computer-readable storage device of claim 7 , wherein the first optical layer element controls connections for multiple Internet protocol layer routers located in the first network office.

12. The computer-readable storage device of claim 7 , wherein transmitting a request to the second optical layer element to coordinate replacement of the link further comprises transmitting instructions to use an application programming interface call to create the link.

13. A system comprising:
a first network office including a first Internet protocol layer router, a redundant Internet protocol layer router and a first optical layer element, the first optical layer element being connected directly with the first Internet protocol layer router;
the first optical layer element comprising a processor and a memory containing instructions that, when executed by the processor, cause the processor to detect a failure of the first Internet protocol layer router, and to transmit a request to a second optical layer element in a second network office to coordinate replacement of a link for Internet protocol traffic to the failed first Internet protocol layer router with a new link for Internet protocol traffic to the redundant Internet protocol layer router, the new link to the redundant Internet protocol layer router being via an inter-office optical connection between the first optical layer element and the second optical layer element.

14. The system of claim 13 , wherein the memory of the first optical layer element further contains instructions to transmit a request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a port on a second Internet protocol layer router in the second network office formerly used in a link between the second Internet protocol layer router and the failed first Internet protocol layer router.

15. The system of claim 13 , wherein the memory of the first optical layer element further contains instructions to transmit a request to coordinate replacement of the link to the failed first Internet protocol router with a new link that uses a spare port on the redundant Internet protocol layer router.

16. The system of claim 13 , wherein the memory of the first optical layer element further contains instruct

Assignees

• At & T Ip Ii Lp

Inventors

• Chiu Angela L
• Strand John Lester

Classifications

• H04L45/00 Primary

  Routing or path finding of packets in data switching networks (routing or path finding in wireless networks H04W40/00) · CPC title

• H04L45/58

  Association of routers · CPC title

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title

• H04L49/557

  Error correction, e.g. fault recovery or fault tolerance · CPC title

• H04Q11/0071

  Provisions for the electrical-optical layer interface · CPC title