Method and system for autonomous discovery of colored interface mappings across routing and optical layers

• US 10,447,551 B1
• Filed: 11/29/2018
• Issued: 10/15/2019
• Est. Priority Date: 11/29/2018
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Zhang, Randy Hehui, Asati, Rajiv, Galimberti, Gabriele Maria, Roberts, Errol Fenton, Wakim, Walid
• Primary Examiner(s): Singh, Dalzid E
• Application Number:
  US16/203,930
• Time in Patent Office: 320 Days
• Field of Search: 398 83
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0257 Wavelength assignment algorithms
• CPC Class Codes: H04J 14/0267 Optical signaling or routing
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 43/0811 by checking connectivity

Abstract

An interface mapping method includes obtaining, at a network controller, device information of network devices configured to be in communication with each other through an optical network. The network devices include a plurality of colored interfaces that support a range of wavelengths for communication in the optical network. Interface information of the colored interfaces of the network devices is obtained, and optical power information associated with each of the colored interfaces is obtained. Optical power margins for a transmitter interface of the colored interfaces. The transmitter interface is controlled to transmit a power sequence based on the optical power margins, and power readings are obtained from a receiver interface of the colored interfaces. A topology between the colored interfaces is discovered based on the power sequence and the power readings.

Claims

1. A method comprising:

obtaining, at a network controller, device information of network devices configured to be in communication with each other in an optical network, wherein the network devices include a plurality of colored interfaces that support a range of wavelengths for communication in the optical network;

obtaining interface information of the colored interfaces of the network devices;

obtaining optical power information associated with each of the colored interfaces;

computing optical power margins for a transmitter interface of the colored interfaces;

controlling the transmitter interface to transmit a power sequence based on the optical power margins;

obtaining power readings from a receiver interface of the colored interfaces; and

discovering a topology between the colored interfaces based on the power sequence and the power readings.

2. The method of claim 1, wherein the optical power margins include a transmitter high margin:

Tx-HM=Tx-High−

Txc, where Tx-High is a maximum power from the transmitter interface and Txc is a current power from the transmitter interface, and wherein the power sequence is a step sequence having a power change step value, the method further comprising;

determining whether the transmitter high margin is equal to or greater than the power change step value; and

in response to determining that the transmitter high margin is equal to or greater than the power change step value, configuring the power sequence to be a step-up power sequence.

3. The method of claim 2, wherein discovering includes discovering connectivity between interfaces of layer 3 network devices and interfaces of layer 0 network devices.

4. The method of claim 2, further comprising:

controlling the transmitter interface to transmit the step-up power sequence two or more times; and

inserting a pause time between two transmissions of the step-up power sequence.

5. The method of claim 2, wherein the optical power margins further includes a receiver low margin Rx-LM defined as a configurable value to enable the receiver interface to detect a signal from the power sequence, and a transmitter power change safety margin:

Tx-SM=Tx-High−

(Rx Low+Rx-LM), where Rx Low is a minimum power the receiver interface can detect, the method further comprising;

in response to determining that the transmitter high margin is not greater than the power change step value, determining whether the transmitter power change safety margin is greater than a power change safety margin, wherein a power change within the power change safety margin does not disrupt communications between the transmitter interface and the receiver interface; and

in response to determining that the transmitter power change safety margin is greater than the power change safety margin, configuring the power sequence to be a step-down power sequence.

6. The method of claim 5, further comprising:

in response to determining that the transmitter power change safety margin is not greater than the power change safety margin, terminating the discovering.

7. The method of claim 5, further comprising:

detecting a service outage at the receiver interface while the step-down power sequence is transmitted; and

controlling the transmitter interface to stop transmitting the step-down power sequence.

8. An apparatus comprising:

a network interface that enables network communications;

a processor; and

a memory to store data and instructions executable by the processor,

wherein the processor is configured to execute the instructions to;

obtain device information of network devices configured to be in communication with each other in an optical network, wherein the network devices include a plurality of colored interfaces that support a range of wavelengths for communication in the optical network;

obtain interface information of the colored interfaces of the network devices;

obtain optical power information associated with each of the colored interfaces;

compute optical power margins for a transmitter interface of the colored interfaces;

control the transmitter interface to transmit a power sequence based on the optical power margins;

obtain power readings from a receiver interface of the colored interfaces; and

discover a topology between the colored interfaces based on the power sequence and the power readings.

9. The apparatus of claim 8, wherein the optical power margins include a transmitter high margin:

Tx-HM=Tx-High−

Txc, where Tx-High is a maximum power from the transmitter interface and Txc is a current power from the transmitter interface, and wherein the power sequence is a step sequence having a power change step value, wherein the processor is configured to execute the instructions to;

determine whether the transmitter high margin is equal to or greater than the power change step value; and

in response to determining that the transmitter high margin is equal to or greater than the power change step value, configure the power sequence to be a step-up power sequence.

10. The apparatus of claim 9, wherein the processor is configured to discover discovering between interfaces of layer 3 network devices and interfaces of layer 0 network devices.

11. The apparatus of claim 9, wherein the processor is configured to execute the instructions to:

control the transmitter interface to transmit the step-up power sequence two or more times; and

insert a pause time between two transmissions of the step-up power sequence.

12. The apparatus of claim 9, wherein the optical power margins further includes a receiver low margin Rx-LM defined as a configurable value to enable the receiver interface to detect a signal from the power sequence, and a transmitter power change safety margin:

Tx-SM=Tx-High−

(Rx Low+Rx-LM), where Rx Low is a minimum power the receiver interface can detect, wherein the processor is configured to execute the instructions to;

in response to determining that the transmitter high margin is not greater than the power change step value, determine whether the transmitter power change safety margin is greater than a power change safety margin, wherein a power change within the power change safety margin does not disrupt communications between the transmitter interface and the receiver interface; and

in response to determining that the transmitter power change safety margin is greater than the power change safety margin, configure the power sequence to be a step-down power sequence.

13. The apparatus of claim 12, wherein the processor is configured to execute the instructions to:

in response to determining that the transmitter power change safety margin is not greater than the power change safety margin, terminate discovering the topology.

14. The apparatus of claim 12, wherein the processor is configured to execute the instructions to:

detect a service outage at the receiver interface while the step-down power sequence is transmitted; and

control the transmitter interface to stop transmitting the step-down power sequence.

15. One or more non-transitory computer-readable storage media encoded with software comprising computer executable instructions which, when executed by a processor, cause the processor to:

obtain device information of network devices configured to be in communication with each other through an optical network, wherein the network devices include a plurality of colored interfaces that support a range of wavelengths for communication in the optical network;

obtain interface information of the colored interfaces of the network devices;

obtain optical power information associated with each of the colored interfaces;

compute optical power margins for a transmitter interface of the colored interfaces;

control the transmitter interface to transmit a power sequence based on the optical power margins;

obtain power readings from a receiver interface of the colored interfaces; and

discover a topology between the colored interfaces based on the power sequence and the power readings.

16. The one or more non-transitory computer-readable storage media of claim 15, wherein the optical power margins include a transmitter high margin:

Tx-HM=Tx-High−

Txc, where Tx-High is a maximum power from the transmitter interface and Txc is a current power from the transmitter interface, and wherein the power sequence is a step sequence having a power change step value, wherein the instructions cause the processor to;

determine whether the transmitter high margin is equal to or greater than the power change step value; and

in response to determining that the transmitter high margin is equal to or greater than the power change step value, configure the power sequence to be a step-up power sequence.

17. The one or more non-transitory computer-readable storage media of claim 16, wherein the instructions cause the processor to:

control the transmitter interface to transmit the step-up power sequence two or more times; and

insert a pause time between two transmissions of the step-up power sequence.

18. The one or more non-transitory computer-readable storage media of claim 16, wherein the optical power margins further includes a receiver low margin Rx-LM defined as a configurable value to enable the receiver interface to detect a signal from the power sequence, and a transmitter power change safety margin:

Tx-SM=Tx-High−

(Rx Low+Rx-LM), where Rx Low is a minimum power the receiver interface can detect, wherein the instructions cause the processor to;

in response to determining that the transmitter high margin is not greater than the power change step value, determine whether the transmitter power change safety margin is greater than a power change safety margin, wherein a power change within the power change safety margin does not disrupt communications between the transmitter interface and the receiver interface; and

in response to determining that the transmitter power change safety margin is greater than the power change safety margin, configure the power sequence to be a step-down power sequence.

19. The one or more non-transitory computer-readable storage media of claim 18, wherein the instructions cause the processor to:

in response to determining that the transmitter power change safety margin is not greater than the power change safety margin, terminate discovering the topology.

20. The one or more non-transitory computer-readable storage media of claim 18, wherein the instructions cause the processor to:

detect a service outage at the receiver interface while the step-down power sequence is transmitted; and

control the transmitter interface to stop transmitting the step-down power sequence.