Extensions to resource reservation protocol (RSVP) -traffic engineering (TE) for bi-directional optical path setup

• US 20020054405A1
• Filed: 02/09/2001
• Published: 05/09/2002
• Est. Priority Date: 07/13/2000
• Status: Abandoned Application

• Current Assignee: Avery Group Limited
• Original Assignee: Avery Group Limited
• Inventors: Guo, Duanyang, Zhang, Leah
• Application Number:
  US09/779,011
• Publication Number:
  US 20020054405A1
• Time in Patent Office: Days
• US Class Current: 398/45
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0245 for downstream transmission, e.g. optical line terminal [OLT] to ONU
• CPC Class Codes: H04J 14/0249 for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
• CPC Class Codes: H04J 14/0283 WDM ring architectures

Abstract

A method of providing bi-directional optical switched paths in an optical network includes the allocation of a pair of labels for uni-directional optical paths in a backward direction and in a forward direction. The forward and backward going optical paths of a given optical node are either both outgoing paths from the given optical node or both incoming paths toward the given optical node. The provision of bi-directional optical switched paths can be implemented as an extension to the Resource Reservation Protocol-Traffic Engineering (RSVP-TE) while avoiding the problem of contention for label allocation.

Claims

1. A method of providing bi-directional optical switched paths in an optical network, the method comprising the steps of:

providing a label request object for at least one bi-directional optical switched path (BOSP) tunnel;

providing a label object for said at least one BOSP tunnel;

detecting a reservation (RESV) message for said at least one BOSP; and

allocating a pair of labels for a first outgoing path in a backward direction and for a second outgoing path in a forward direction upon detecting the RESV message.

2. The method of claim 1, wherein the pair of labels include a first fiber identification (fiber ID) for the first outgoing path and a second fiber ID for the second outgoing path.

3. The method of claim 1, wherein the pair of labels include a first wavelength identification (wavelength ID) for the first outgoing path and a second wavelength ID for the second outgoing path.

4. The method of claim 1, wherein the pair of labels include a first sub-channel identification (sub-channel ID) for the first outgoing path and a second sub-channel ID for the second outgoing path.

5. The method of claim 1 for communication between a plurality of optical nodes, further comprising the step of transmitting a path message by a first one of the nodes.

6. The method of claim 5, further comprising the step of transmitting the RESV message by a second one of the nodes.

7. The method of claim 6, wherein the steps of detecting the RESV message and allocating the pair of labels are performed by a third one of the nodes connected between the first node and the second node.

8. The method of claim 7, further comprising the step of providing a bi-directional label request for the third node upon receiving the path message.

9. The method of claim 8, further comprising the step of recording the bi-directional label request into a path state block (PSB) by the third node.

10. The method of claim 8, further comprising the steps of:

determining whether the pair of labels can be assigned for the first and second outgoing paths; and

transmitting an RESV error message to the second node in response to the step of determining that the pair of labels cannot be assigned.

11. The method of claim 8, further comprising the step of transmitting a path tear message and a RESV tear message to delete the pair of labels.

12. The method of claim 5, wherein the optical nodes comprise routers.

13. The method of claim 12, wherein the routers comprise optical cross-connects (OXCs).

14. The method of claim 1, wherein the label request object includes a minimum port number, a maximum port number, a minimum wavelength number, a maximum wavelength number, a minimum sub-channel number, and a maximum sub-channel number.

15. The method of claim 1, wherein the pair of labels are allocated as an extension to resource reservation protocol-traffic engineering (RSVP-TE).

17. The method of claim 16, wherein the pair of labels include a first fiber identification (fiber ID) for the first incoming path and a second fiber ID for the second incoming path.

18. The method of claim 16, wherein the pair of labels include a first wavelength identification (wavelength ID) for the first incoming path and a second wavelength ID for the second incoming path.

19. The method of claim 16, wherein the pair of labels include a first sub-channel identification (sub-channel ID) for the first incoming path and a second sub-channel ID for the second incoming path.

20. The method of claim 16 for communication between a plurality of optical nodes, further comprising the step of transmitting a path message by a first one of the nodes.

21. The method of claim 20, further comprising the step of transmitting the RESV message by a second one of the nodes.

22. The method of claim 21, wherein the steps of detecting the RESV message and allocating the pair of labels are performed by a third one of the nodes connected between the first node and the second node.

23. The method of claim 22, further comprising the step of providing a bi-directional label request for the third node upon receiving the path message.

24. The method of claim 23, further comprising the step of recording the bi-directional label request into a path state block (PSB) by the third node.

25. The method of claim 23, further comprising the steps of:

determining whether the pair of labels can be assigned for the first and second incoming paths; and

transmitting an RESV error message to the second node in response to the step of determining that the pair of labels cannot be assigned.

26. The method of claim 23, further comprising the step of transmitting a path tear message and a RESV tear message to delete the pair of labels.

27. The method of claim 20, wherein the optical nodes comprise routers.

28. The method of claim 27, wherein the routers comprise optical cross-connects (OXCs).

29. The method of claim 16, wherein the label request object includes a minimum port number, a maximum port number, a minimum wavelength number, a maximum wavelength number, a minimum sub-channel number, and a maximum sub-channel number.

30. The method of claim 16, wherein the pair of labels are allocated as an extension to resource reservation protocol-traffic engineering (RSVP-TE).

16. A method of providing bi-directional optical switched paths in an optical network, the method comprising the steps of:

providing a label request object for at least one bi-directional optical switched path (BOSP) tunnel;

providing a label object for said at least one BOSP tunnel;

detecting a reservation (RESV) message for said at least one BOSP; and

allocating a pair of labels for a first incoming path in a backward direction and for a second incoming path in a forward direction upon detecting the RESV message.