Localized network repair systems and methods

Patent metadata

Field	Value
Publication number	US-9407359-B2
Application number	US-201414482023-A
Country	US
Kind code	B2
Filing date	Sep 10, 2014
Priority date	Jul 30, 2014
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A localized repair method in a network using a control plane includes, responsive to a failure on a local repair segment defined on a connection traversing the network, generating a release message in the control plane; attempting a local repair on the local repair segment; if the local repair is unsuccessful, transmitting the release message to redial the connection; and, if the local repair is successful, signaling a new sub-path based on the local repair. A controller and a network are also disclosed.

First claim

What is claimed is:

1. A localized repair method in a network using a control plane, comprising: responsive to a failure on a local repair segment defined on a connection traversing the network, generating a release message in the control plane, wherein the local repair segment is one of (i) between optical-electrical conversion points of the connection and (ii) a High Order (HO) Optical Transport Network (OTN) multiplexing segment of the connection, and wherein the local repair segment comprises multiple spans that are determined based on an attribute of either a photonic domain for (i) or an OTN domain for (ii); attempting a local repair on the local repair segment; if the local repair is unsuccessful, transmitting the release message to redial the connection; and if the local repair is successful, signaling a new sub-path based on the local repair.

2. The localized repair method of claim 1 , wherein the local repair comprises:
releasing the connection on the local repair segment while maintaining the connection outside of the local repair segment; and
installing the new sub-path in the local repair segment.

3. The localized repair method of claim 1 , wherein the local repair segment is between two boundary nodes on a path of the connection, and wherein the boundary nodes are nodes with three or more degrees.

4. The localized repair method of claim 3 , further comprising:
designating one of the two boundary nodes to perform the local repair and signal the other of the two boundary nodes.

5. The localized repair method of claim 1 , further comprising:
changing a wavelength in the new sub-path to avoid wavelength blocking.

6. The localized repair method of claim 1 , wherein the release message is stored at the local repair segment while the local repair is performed to ensure that network-wide involvement is avoided unless the repair is unsuccessful.

7. The localized repair method of claim 1 , wherein the connection is one of a Subnetwork Connection (SNC), Subnetwork Connection Protection (SNCP), and a Label Switched Path (LSP).

8. The localized repair method of claim 1 , wherein the failure is a regenerator failure at a boundary node of the local repair segment and the local repair comprises switching to another regenerator located at the boundary node with a wavelength retuned thereon.

9. The localized repair method of claim 1 , wherein the local repair is determined as unsuccessful based on any of a crankback in setup in the local repair, an inactivity timer expiration, and violating Absolute Route Diversity requirements.

10. A controller, comprising: an interface communicatively coupled to one or more nodes in a network; a processor communicative coupled to the interface; and memory storing computer-executable instructions that, when executed, cause the processor to: obtain a path for a connection in the network operating a control plane; and utilize local repair segments on the connection in the network based on boundary points in the path, wherein the boundary points are nodes between which the connection has an ability to be locally repaired, wherein the boundary points are any of optical-electrical conversion points or Optical Transport Network (OTN) multiplexing points, and wherein the control plane is configured, upon a failure in the local repair segments, to attempt a local repair first without network-wide involvement, wherein the local repair segments are determined based on one of i) optical-electrical conversion points of the connection and ii) on High Order (HO) Optical Transport Network (OTN) multiplexing segments of the connection in the network, and wherein the local repair segment comprises multiple spans that are determined based on an attribute of either a photonic domain for (i) or an OTN domain for (ii).

11. The controller of claim 10 , wherein, responsive to the failure, a wavelength in the local repair segment is changed to avoid wavelength blocking.

12. The controller of claim 10 , wherein, in the local repair segments, network-wide signaling of a release message is constrained until the local repair fails or if the local repair is successful to avoid network-wide involvement in the failure for the connection during the local repair.

13. The controller of claim 10 , wherein the failure is a regenerator failure at one of the boundary points and the local repair comprises switching to another regenerator located at the one of the at boundary points with a wavelength retuned thereon.

14. The controller of claim 10 , wherein the local repair is determined unsuccessful based on any of a crankback in setup in the local repair, an inactivity timer expiration, and violating Absolute Route Diversity requirements.

15. A network, comprising: a plurality of nodes; a plurality of links interconnecting the plurality of nodes; a control plane operated between the plurality of nodes; a connection with a path through some of the plurality of links between two nodes of the plurality of nodes, one of the two nodes is a source node and another of the two nodes is a destination node, and wherein the path includes two boundary nodes; and a local repair segment defined on the path between the two boundary nodes, wherein, upon a failure in the local repair segment, control plane signaling to tear down the connection is store within the local repair segment such that a local repair is attempted first, and if the local repair is unsuccessful, the control plane signaling is released for a tear down of the connection and a redial, wherein the two boundary nodes are any of optical-electrical conversion points or Optical Transport Network (OTN) multiplexing points, and wherein the local repair segment comprises multiple spans that are determined based on an attribute of either a photonic domain for (i) or an OTN domain for (ii).

Assignees

• Swinkels Gerard Leo
• Chhillar Mohit
• Prakash Anurag
• Richens Dominic
• Kannan Rajagopalan
• Ciena Corp

Inventors

• Swinkels Gerard Leo
• Chhillar Mohit
• Prakash Anurag
• Richens Dominic
• Kannan Rajagopalan

Classifications

• H04L45/62

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

• H04J14/0271

  Impairment aware routing · CPC title

• H04L45/28

  using route fault recovery · CPC title

• H04J2203/006

  Fault tolerance and recovery · CPC title

• H04L45/22

  Alternate routing · CPC title