Connection control interface for asynchronous transfer mode switches

• US 6,434,612 B1
• Filed: 12/10/1997
• Issued: 08/13/2002
• Est. Priority Date: 12/10/1997
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Padmanabhan, Radhika, Buckley, William P., Fernandes, Neufito L., Choi, Isaac P., Lawrence, Jeremy R, Hughes, David A.
• Primary Examiner(s): Harrell, Robert B.
• Application Number:
  US08/988,300
• Time in Patent Office: 1,707 Days
• Field of Search: 709/200, 709/213, 709/217, 709/218, 709/220, 709/223, 709/226, 379/269, 379/242, 379/268
• US Class Current: 709/223
• CPC Class Codes: H04L 2012/5632 Bandwidth allocation
• CPC Class Codes: H04L 49/255 Control mechanisms for ATM switching fabrics
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A connection control interface for switches in a network is provided. The connection control interface allows the multiservice switch to provide a number of switch resource partitions to a number of independent controllers coupled to the switch. The switch resource partitions comprise a number of subsets of switch resources that define a number of independent subset networks of a physical network. The connection control interface allows the independent controllers to control the connections of the switch using the number of switch resource partitions. The independent controllers each use one of a number of control systems, the control systems comprising a network software level. The independent controllers comprise a virtual switch interface having a master component and a slave component where the master and slave components may be hosted on different processors. The slave components may be hosted on a control card that controls a number of port cards of the switch or on a port card processor. The switch and the independent controllers are resynchronized when discrepancies are detected between the connections on the switch and those expected by the each of the plurality of independent controllers.

Claims

1. A method for controlling a switch comprising:

providing a plurality of switch resource partitions to a plurality of independent controllers from the switch;

controlling connections of the switch using the plurality of switch resource partitions of the plurality of independent controllers.

2. The method of claim 1, wherein controlling connections comprises controlling at least one switch interface.

3. The method of claim 2, wherein each of the plurality of independent controllers comprises at least one switch interface master component, and wherein the switch comprises at least one switch interface slave component.

4. The method of claim 3, wherein controlling connections comprises controlling at least one switch interface slave component using the at least one switch interface master component.

5. The method of claim 4, wherein the at least one switch interface slave component is hosted on a different processor than the at least one switch interface master component.

6. The method of claim 5, wherein each of the at least one switch interface slave components is hosted on one of a plurality of processors, each of the plurality of processors controlling at least one port card of the switch.

7. The method of claim 5, wherein the switch comprises a plurality of switch interface slave components, wherein at least one of the plurality of switch interface slave components is hosted on a control card, the control card controlling a plurality of port cards of the switch, and wherein at least one of the plurality of switch interface slave components is hosted on at least one processor of at least one port card of the switch.

8. The method of claim 1, wherein the plurality of switch resource partitions comprises a plurality of subsets of switch resources.

9. The method of claim 8, wherein the plurality of subsets of switch resources defines a plurality of independent subset networks of a physical network, each of the plurality of independent subset networks controlled by the each of a plurality of groups of independent controllers.

10. The method of claim 8, further comprising the switch allocating a fixed partition of bandwidth to each of the plurality of independent controllers.

11. The method of claim 8, further comprising the switch dynamically sharing bandwidth allocation between each of the plurality of independent controllers.

12. The method of claim 8, wherein the plurality of switch resource partitions comprises a number of available connections in the switch.

13. The method of claim 8, wherein the plurality of switch resource partitions comprises at least one virtual path identifier and at least one virtual circuit identifier available at each of a plurality of ports.

14. The method of claim 1, further comprising each of the plurality of independent controllers using at least one of a plurality of connection routing protocols, the at least one of a plurality of connection routing protocols, the at least one of a plurality of connection routing protocols comprising a network software level control system.

15. The method of claim 14, wherein the at least one of a plurality of connection routing protocols comprises automatic connection routing.

16. The method of claim 14, wherein the at least one of a plurality of connection routing protocols comprises PNNI.

17. The method of claim 14, wherein the at least one of a plurality of connection routing protocols comprises tag switching.

18. The method of claim 1, further comprising each of a plurality of independent controllers requesting connections having at least one Quality of Service parameter.

19. The method of claim 18, wherein the at least one Quality of Service parameter comprises an ATM Forum service class, an Internet Protocol Type of Service class, a tag switching service class, and a priority service class.

20. The method of claim 19, wherein an Internet Protocol Type of Service class is specified for an ATM connection.

21. The method of claim 18, wherein the at least one Quality of Service parameter is used with at least one other ATM parameter to generate extended switch parameters.

22. The method of claim 1, further comprising resynchronizing the switch and each of the plurality of independent controllers when discrepancies are detected between the connections on the switch and those expected by the each of the plurality of independent controllers.

23. The method of claim 22, wherein a checksum component is associated with each connection, an error in the checksum component indicating a discrepancy between the connections.

24. The method of claim 23, wherein the resynchronization comprises reestablishing connections in which the checksum component is in error.

25. The method of claim 1, wherein the switch supports asynchronous transfer mode (ATM) interfaces in a network.

26. The method of claim 1, wherein the switch supports frame relay interfaces, voice interfaces, and data interfaces in a network.

27. The method of claim 1, wherein controlling switch connections comprises each of the plurality of independent controllers controlling at least one port card of the switch.

28. The method of claim 1, further comprising synchronizing the switch and each of the plurality of independent controllers, the synchronizing comprising exchanging database information for a known state.

29. The method of claim 1, wherein the switch is a ATM switch.

30. The method of claim 1, wherein the switch is a packet switch.

31. The method of claim 1, wherein the switch is a circuit switch.

32. An apparatus for controlling a switch in a network, the apparatus comprising:

a first component that provides one of a plurality of switch resource partitions of the switch to each of a plurality of independent controllers;

a second component in each of the plurality of independent controllers that independently control connections in the switch using the one of a plurality of switch resource partitions.

33. The apparatus of claim 32, wherein the first component comprises at least one switch interface slave component, and wherein the second component comprises at least one switch interface master component.

34. The apparatus of claim 33, wherein the at least one switch interface slave component is hosted on a different processor than the at least one switch interface master component.

35. The apparatus of claim 34, wherein each of the at least one switch interface slave components is hosted on one of a plurality of processors, each of the plurality of processors controlling at least one port card of the switch.

36. The apparatus of claim 32, wherein the apparatus supports connections among a plurality of types of interfaces.

37. The apparatus of claim 36, wherein the apparatus supports connections between a first endpoint having a first interface type and a second endpoint having a second interface type, wherein the first interface type is different from the second interface type.

38. The apparatus of claim 36, wherein the apparatus supports asynchronous transfer mode (ATM) interfaces.

39. The apparatus of claim 36, wherein the apparatus supports frame relay connections, voice connections, and circuit emulation connections.

40. The apparatus of claim 32, wherein each of the plurality of independent controllers uses at least one of a plurality of connection routing protocols, the at least one of a plurality of connection routing protocols comprising a network software level control system.

41. The apparatus of claim 32, wherein the plurality of switch resource partitions comprises a plurality of subsets of switch resources, the plurality of subsets of switch resources defining a plurality of independent subset networks of a physical network, each of the plurality of independent subset networks controlled by each of a plurality of groups of independent controllers.

42. The apparatus of claim 32, wherein each of the plurality of independent controllers controls at least one port card of the switch.

43. The apparatus of claim 32, wherein the states of the switch and each of the plurality of independent controllers are synchronized by the exchange of database information.

44. The apparatus of claim 32, wherein the switch and each of the plurality of independent controllers are resynchronized when discrepancies are detected between the connections on the switch and those expected by each of the plurality of independent controllers, wherein the resynchronization comprises reestablishing a connection in which a checksum component is in error.

45. The apparatus of claim 32, wherein each of the plurality of independent controllers support connections having at least one Quality of Service parameter.

46. A system comprising a switch having a switch interface, the switch interface configured to:

provide a plurality of subsets of switch resources of the switch to a plurality of independent controllers;

independently control connections of the switch using the plurality of subsets of switch resources.

47. The system of claim 46, wherein the switch interface comprises at least one switch interface slave component and at least one switch interface master component.

48. The system of claim 47, wherein the at least one switch interface slave component is hosted on a different processor than the at least one switch interface master component.

49. The system of claim 48, wherein each of the at least one switch interface slave components is hosted on one of a plurality of processors, each of the plurality of processors controlling at least one port card of the switch.

50. The system of claim 46, wherein the system supports connections among a plurality of types of interfaces.

51. The system of claim 50, wherein the system supports connections between a first endpoint having a first interface type and a second endpoint having a second interface type, wherein the first interface type is different from the second interface type.

52. The system of claim 50, wherein the system supports asynchronous transfer mode connections.

53. The system of claim 50, wherein the system supports frame relay connections, voice connections, and circuit emulation connections.

54. The system of claim 46, wherein the plurality of subsets of switch resources define a plurality of independent subset networks of a physical network, each of the plurality of independent subset networks controlled by each of the plurality of groups of independent controllers.

55. The system of claim 46, wherein each of the plurality of independent controllers controls at least one port card of the switch.

56. The system of claim 46, wherein the switch and each of the plurality of independent controllers are synchronized by exchanging database information for a known state.

57. The system of claim 46, wherein connections are reestablished between the switch and any of the plurality of independent controllers when discrepancies are indicated between expected connections of the any of the plurality of independent controllers and the corresponding subset of switch resources of the switch.

58. The system of claim 46, wherein the each of a plurality of independent controllers support connections having a plurality of Quality of Service parameters.

59. A computer readable medium containing executable instructions which, when executed in a processing system, causes the system to perform the steps for controlling a switch comprising the steps of:

providing a plurality of switch resource partitions to a plurality of independent controllers from the switch;

controlling connections of the switch using the plurality of switch resource partitions of the plurality of independent controllers.

60. The computer readable medium of claim 59, further causing the system to control each of the plurality of independent controllers comprising at least one switch interface master component, wherein the switch comprises at least one switch interface slave component.

61. The computer readable medium of claim 60, wherein the at least one switch interface slave component is hosted on a different processor than the at least one switch interface master component.

62. The computer readable medium of claim 61, wherein each of the at least one switch interface slave components is hosted on one of a plurality of processors, each of the plurality of processors controlling at least one port card of the switch.

63. The computer readable medium of claim 59, further causing the system to control each of the plurality of independent controllers using at least one of a plurality of connection routing protocols.

64. The computer readable medium of claim 59, further causing the plurality of switch resource partitions to comprise a plurality of subsets of switch resources, the plurality of subsets of switch resources defining a plurality of independent subset networks of a physical network, each of the plurality of independent subset networks controlled by the each of a plurality of independent controllers.

65. The computer readable medium of claim 59, further causing the system to perform the step of synchronizing the switch and each of the plurality of independent controllers.

66. The computer readable medium of claim 59, further causing the system to perform the step of resynchronizing the switch and each of the plurality of independent controllers when discrepancies are detected between the connections on the switch and those expected by the each of the plurality of independent controllers.

67. The computer readable medium of claim 59, further causing each of the plurality of independent controllers to support connections having a plurality of Quality of Service parameters, the plurality of Quality of Service parameters comprising an ATM Forum service class and an Internet Protocol Type of Service class.

68. An apparatus for controlling a switch in a network, the apparatus comprising:

first means for providing one of a plurality of switch resource partitions of the switch to each of a plurality of independent controllers;

second means in each of the plurality of independent controllers for independently controlling connections in the switch using one of a plurality of switch resource partitions.