Method and system for automatic topology discovery in wavelength division multiplexing (WDM) network
First Claim
1. A method for automatic topology discovery implemented in a wavelength division multiplexing (WDM) network, wherein the WDM network contains a plurality of wavelength switching devices, the method comprising:
- selecting an unassigned wavelength between a pair of wavelength switching devices of the plurality of wavelength switching devices;
for a first port of a first wavelength switching device of the pair of wavelength switching devices,configuring a pass through state between the first port and a coupling port of the first wavelength switching device, wherein the coupling port coupled to a control node aggregating traffic of the first wavelength switching device;
sending a first probing signal at the unassigned wavelength to the first wavelength switching device;
detecting iteratively the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device of the pair of wavelength switching devices during a first time period, wherein a pass through state is configured iteratively between each port of the set of ports of the second wavelength switching device and a coupling port of the second wavelength switching device; and
recording a connection between the first port of the first wavelength switching device and a port of the second wavelength switching device when the first probing signal is detected at the unassigned wavelength at the port of the second wavelength switching device.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for automatic topology discovery implemented in a wavelength division multiplexing (WDM) network is disclosed. The WDM network contains a number of wavelength switching devices, and the method starts with selecting an unassigned wavelength between a pair of wavelength switching devices. For a first port of a first wavelength switching device, a pass through state is configured between the first port and a coupling port of the first wavelength switching device, and a first probing signal is sent at the unassigned wavelength to the first wavelength switching device. The method continues with detecting iteratively the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device during a time period, and recording a connection between the first port of the first wavelength switching device and a port of the second wavelength switching devices when the first probing signal is detected.
11 Citations
22 Claims
-
1. A method for automatic topology discovery implemented in a wavelength division multiplexing (WDM) network, wherein the WDM network contains a plurality of wavelength switching devices, the method comprising:
-
selecting an unassigned wavelength between a pair of wavelength switching devices of the plurality of wavelength switching devices; for a first port of a first wavelength switching device of the pair of wavelength switching devices, configuring a pass through state between the first port and a coupling port of the first wavelength switching device, wherein the coupling port coupled to a control node aggregating traffic of the first wavelength switching device; sending a first probing signal at the unassigned wavelength to the first wavelength switching device; detecting iteratively the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device of the pair of wavelength switching devices during a first time period, wherein a pass through state is configured iteratively between each port of the set of ports of the second wavelength switching device and a coupling port of the second wavelength switching device; and recording a connection between the first port of the first wavelength switching device and a port of the second wavelength switching device when the first probing signal is detected at the unassigned wavelength at the port of the second wavelength switching device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A network device configured as a control node for automatic topology discovery of a wavelength division multiplexing (WDM) network, wherein the WDM network contains a plurality of wavelength switching devices, the network device comprising:
-
a controller, including; a control path interface configured to configure ports of the plurality of wavelength switching devices; a connection database configured to record connections based on a recording request; a probing signal selector configured to select an unassigned wavelength between a pair of wavelength switching devices of the plurality of wavelength switching devices; and a pass through provisioner configured to, for a first port of a first wavelength switching device of the pair of wavelength switching devices, initiate configuring a pass through state between the first port and a coupling port of the first wavelength switching device, wherein the coupling port coupled to a control node aggregating traffic of the first wavelength switching device; and a discovery unit (DiU) coupled to the WDM controller, the discovery unit including; a data path interface configured to send and detect probing signals as requested; a probing signal initiator configured to initiate sending a first probing signal at the unassigned wavelength to the first wavelength switching device; and a probing signal detector configured to initiate iteratively detecting the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device of the pair of wavelength switching devices during a first time period, wherein a pass through state is configured iteratively between each port of the set of ports of the second wavelength switching device and a coupling port of the second wavelength switching device, and send out the recording request to record a connection between the first port of the first wavelength switching device and a port of the second wavelength switching device when the first probing signal is detected at the unassigned wavelength through the port of the second wavelength switching device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for automatic topology discovery implemented in a wavelength division multiplexing (WDM) network, wherein the WDM network contains a plurality of wavelength switching devices, the method comprising:
-
selecting an unassigned wavelength between a pair of wavelength switching devices of the plurality of wavelength switching devices, wherein each of the pair of wavelength switching devices is assigned to one or more optical add drop modules (OADMs) through dedicated ports of the wavelength switching devices; for a first port of a first wavelength switching device of the pair of wavelength switching devices, configuring a pass through state between the first port and a coupling port of the first wavelength switching device, wherein the coupling port coupled to a control node aggregating traffic of the first wavelength switching device; sending a first probing signal at the unassigned wavelength to the first wavelength switching device; detecting iteratively the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device of the pair of wavelength switching devices during a first time period, wherein a pass through state is configured iteratively between each port of the set of ports of the second wavelength switching device and a coupling port of the second wavelength switching device; recording a connection between the first port of the first wavelength switching device and a port of the second wavelength switching device when the first probing signal is detected at the unassigned wavelength at the port of the second wavelength switching device; recording a first power level where the first probing signal is detected at the unassigned wavelength; and for each OADM of a set of OADMs assigned to the first wavelength switching device, selecting a wavelength that has been assigned to the wavelength switching devices and the OADM (“
assigned wavelength”
), wherein each port of each OADM is coupled to either a patch cord or a reflector;sending a second probing signal at the assigned wavelength to the first wavelength switching device; detecting the second probing signal at the assigned wavelength through the port of the second wavelength switching device for the OADM during a second time period; and recording no working OADM provisioned properly between the ports of the first wavelength switching device and the second wavelength switching device upon the detected second probing signal having a second power level substantially equal to the first power level, or the second probing signal is not detected during the second time period.
-
-
22. A control node of a wavelength division multiplexing (WDM) network, wherein the WDM network contains a plurality of wavelength switching devices, the control node comprising:
-
a control path interface configured to configure ports of the plurality of wavelength switching devices; a connection database configured to record connections between ports based on a recording request; a probing signal selector configured to select an unassigned wavelength between a pair of wavelength switching devices of the plurality of wavelength switching devices; a pass through provisioner configured to, for a first port of a first wavelength switching device of the pair of wavelength switching devices, initiate configuring a pass through state between the first port and a coupling port of the first wavelength switching device, wherein the coupling port coupled to the control node aggregating traffic of the first wavelength switching device; and a discovery unit including; a data path interface configured to send and detect probing signals as requested; a probing signal initiator configured to initiate sending a first probing signal through the data path interface at the unassigned wavelength to the first wavelength switching device; and a probing signal detector configured to initiate iteratively detecting the first probing signal at the unassigned wavelength through each of a set of ports of a second wavelength switching device of the pair of wavelength switching devices during a first time period, wherein a pass through state is configured iteratively between each port of the set of ports of the second wavelength switching device and a coupling port of the second wavelength switching device, and send out the recording request to record a connection between the first port of the first wavelength switching device and a port of the second wavelength switching device when the first probing signal is detected at the unassigned wavelength through the port of the second wavelength switching device.
-
Specification