Joint IP/optical layer restoration after a router failure

Patent metadata

Field	Value
Publication number	US-10148349-B2
Application number	US-201715605210-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	Jul 20, 2000
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

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, comprising:
by a first optical layer element, detecting a failure of a first Internet protocol layer router connected with the first optical layer element and co-located with the first optical layer element in a first network office; and
by the first optical layer element, coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic, the second link using a redundant Internet protocol layer router co-located in the first network office, and the second link using an inter-office optical connection between the first optical layer element and a second optical layer element in a second network office.

2. The method of claim 1 , wherein the coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic further comprises:
transmitting a request to the second optical layer element in the second network office to set up the second link.

3. The method of claim 1 , wherein the coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic further comprises:
transmitting a request to the second optical layer element in the second network office to complete switching necessary to establish the second link.

4. The method of claim 1 , wherein the second link uses a spare port on the redundant Internet protocol layer router.

5. The method of claim 1 , wherein the second link 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.

6. 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.

7. The method of claim 1 , wherein the coordinating replacement of the first link for Internet protocol traffic further comprises transmitting instructions to use an application programming interface call to create the second link.

8. A computer-readable storage device having stored thereon computer readable instructions for restoring Internet protocol service, wherein execution of the computer readable instructions by a processor causes the processor of a first optical cross connect to perform operations comprising:
detecting a failure of a first Internet protocol layer router, the first Internet protocol layer router being co-located in a first network office with the first optical cross connect; and
coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic, the second link using a redundant Internet protocol layer router co-located in the first network office, and the second link using an inter-office optical connection between the first optical cross connect and a second optical cross connect in a second network office.

9. The computer-readable storage device of claim 8 , wherein the coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic further comprises:
transmitting a request to the second optical cross connect in the second network office to set up the second link.

10. The computer-readable storage device of claim 8 , wherein the coordinating replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic further comprises:
transmitting a request to the second optical cross connect in the second network office to complete switching necessary to establish the second link.

11. The computer-readable storage device of claim 8 , wherein the second link uses a spare port on the redundant Internet protocol layer router.

12. The computer-readable storage device of claim 8 , wherein the second link 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.

13. The computer-readable storage device of claim 8 , wherein the first optical cross connect controls connections for multiple Internet protocol layer routers located in the first network office.

14. The computer-readable storage device of claim 8 , wherein the coordinating replacement of the first link for Internet protocol traffic further comprises transmitting instructions to use an application programming interface call to create the second link.

15. An optical layer element, comprising:
an interface with a first Internet protocol layer router co-located with the optical layer element in a first network office;
an interface with a second Internet protocol layer router co-located with the optical layer element in the first network office;
a processor configured to, upon detection of a failure of the first Internet protocol layer router, coordinate replacement of a first link for Internet protocol traffic that used the failed first Internet protocol layer router with a second link for Internet protocol traffic, the second link using the second Internet protocol layer router, and further using an inter-office optical connection between the optical layer element and a second optical layer element in a second network office.

16. The optical layer element of claim 15 , wherein the processor is further configured to transmit a request to the second optical layer element in the second network office to set up the second link.

17. The optical layer element of claim 15 , wherein the processor is further configured to transmit a request to the second optical layer element in the second network office to complete switching necessary to establish the second link.

18. The optical layer element of claim 15 , wherein the second link uses a spare port on the second Internet protocol layer router.

19. The optical layer element of claim 15 , wherein the second link uses a port on the second Internet protocol layer router formerly used in a link between the failed first Internet protocol layer router and the second Internet protocol layer router.

20. The optical layer element of claim 15 , wherein the processor controls connections for multiple Internet protocol layer routers located in the first network office.

Assignees

• At & T Ip Ii Lp

Inventors

• Chiu Angela L
• Strand John Lester

Classifications

• H04L45/62

  Wavelength based (optical switching H04Q11/0062) · CPC title

• H04L45/00 Primary

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

• H04Q11/0071

  Provisions for the electrical-optical layer interface · CPC title

• H04L45/28

  using route fault recovery · CPC title

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title