Packet routing using optical supervisory channel data for an optical transport system

Patent metadata

Field	Value
Publication number	US-10284290-B2
Application number	US-201514871586-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Sep 30, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

In some examples, a network device comprises one or more processors operably coupled to a memory, and a routing unit configured for execution by the one or more processors to route data traffic on a layer 3 network overlaying an optical transport system; receive optical supervisory channel data for an optical supervisory channel of the optical transport system; determine the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a wavelength, the wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and reconfigure, in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the layer 3 network.

First claim

What is claimed is:

1. A method comprising:
receiving, by a network device that routes data traffic on a layer 3 network overlaying an optical transport system, optical supervisory channel data for an optical supervisory channel of the optical transport system, wherein the optical supervisory channel is transported by a first wavelength;
determining, by the network device, the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a second wavelength, the second wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and
reconfiguring, by the network device in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the link of the layer 3 network, wherein the reconfiguring comprises triggering a Multiprotocol Label Switching (MPLS) fast reroute operation within the layer 3 network to bypass the link of the layer 3 network.

2. The method of claim 1 , wherein the optical supervisory channel comprises an in-fiber supervisory channel that is terminated by optical amplifiers of the optical transport system, and wherein the first wavelength is outside of the amplification band of the optical amplifiers.

3. The method of claim 1 , wherein the triggering comprises triggering the fast reroute operation to cause the network device to subsequently forward traffic on a bypass label switched path for a label switched path that traverses the link, wherein the bypass label switched path bypasses the link.

4. A method comprising:
receiving, by a network device that routes data traffic on a layer 3 network overlaying an optical transport system, optical supervisory channel data for an optical supervisory channel of the optical transport system, wherein the optical supervisory channel is transported by a first wavelength;
determining, by the network device, the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a second wavelength, the second wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and
reconfiguring, by the network device in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the link of the layer 3 network, wherein the reconfiguring comprises inhibiting a Multiprotocol Label Switching (MPLS) fast reroute operation within the layer 3 network from bypassing the link of the layer 3 network.

5. A method comprising:
receiving, by a network device that routes data traffic on a layer 3 network overlaying an optical transport system, optical supervisory channel data for an optical supervisory channel of the optical transport system, wherein the optical supervisory channel is transported by a first wavelength;
determining, by the network device, the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a second wavelength, the second wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and
reconfiguring, by the network device in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the link of the layer 3 network, wherein the reconfiguring comprises modifying any one or more of a traffic engineering database, a routing information base, and a label information base stored by the network device.

6. A network device comprising:
one or more processors operably coupled to a memory;
a routing unit configured for execution by the one or more processors to:
route data traffic on a layer 3 network overlaying an optical transport system;
receive optical supervisory channel data for an optical supervisory channel of the optical transport system, wherein the optical supervisory channel is transported by a first wavelength;
determine the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a second wavelength, the second wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and
reconfigure, in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the link of the layer 3 network, wherein to reconfigure the configuration the routing unit is configured to inhibit an MPLS fast reroute operation within the layer 3 network from bypassing the link of the layer 3 network.

7. A network device comprising:
one or more processors operably coupled to a memory;
a routing unit configured for execution by the one or more processors to:
route data traffic on a layer 3 network overlaying an optical transport system;
receive optical supervisory channel data for an optical supervisory channel of the optical transport system, wherein the optical supervisory channel is transported by a first wavelength;
determine the optical supervisory channel data indicates an event affecting transmission or detection of a signal transported by a second wavelength, the second wavelength traversing an optical fiber of the optical transport system and underlying a link of the layer 3 network; and
reconfigure, in response to determining the optical supervisory channel data indicates the event, a configuration of the network device to modify routing operations of the network device with respect to the data traffic on the link of the layer 3 network, wherein to reconfigure the configuration the routing unit is configured to modify any one or more of a traffic engineering database, a routing information base, and a label information base stored by the network device.

8. The method of claim 1 ,
wherein the first wavelength is outside of an amplification band of optical amplifiers of the optical transport system; and
wherein the second wavelength is within the amplification band of optical amplifiers of the optical transport system.

9. The method of claim 4 , wherein the inhibiting comprises inhibiting, by the network device, the fast reroute operation for a label switched path that traverses the link to inhibit the network device from subsequently forwarding traffic on a bypass label switched path for the label switched path, wherein the bypass label switched path bypasses the link.

10. The method of claim 5 , wherein reconfiguring the configuration of the network device comprises modifying, in the any one or more of the traffic engineering database, the routing information base, and the label information base, a routing metric associated with the link.

11. The method of claim 4 ,
wherein determining the optical supervisory channel data indicates the event comprises determining, by the network device, the optical supervisory channel data indicates transient amplifier spontaneous emissions by an optical amplifier for the optical fiber that amplifies optical signals transported by the second wavelength traversing the optical fiber, and
wherein the inhibiting comprises inhibiting, by the network device in response to determining the optical supervisory channel data indicates the transient amplifier spontaneous emissions, the fast reroute operation for a labe

Assignees

• Juniper Networks Inc

Inventors

• Grammel Gert
• Di Mola Domenico
• Alleston Steven B

Classifications

• H04Q2011/0077

  Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS · CPC title

• H04Q2011/0073

  Provisions for forwarding or routing, e.g. lookup tables · CPC title

• H04B10/038

  using bypasses · CPC title

• H04L41/0672

  Electricity · mapped topic

• H04J14/021

  Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] · CPC title