Network device including multiple mid-planes

• US 7,023,845 B1
• Filed: 06/16/2000
• Issued: 04/04/2006
• Est. Priority Date: 06/13/2000
• Status: Expired due to Term

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Simons, Corey, Everdell, Peter B., Branscomb, Brian, Westerberg, Daniel I.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Mais, Mark A.
• Application Number:
  US09/595,709
• Time in Patent Office: 2,118 Days
• Field of Search: 370386-387, 370/389, 361714-730, 361/736, 361752-753, 361/775, 361/784, 361/788, 361796-802
• US Class Current: 370/389
• CPC Class Codes: G06F 11/1433 during software upgrading
• CPC Class Codes: G06F 11/1458 Management of the backup or restore process
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/1482 by means of middleware or OS functionality
• CPC Class Codes: G06F 11/203 using migration
• CPC Class Codes: G06F 2201/80 Database-specific techniques
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 41/0233 Object-oriented techniques, for representation of network management data, e.g. common object request broker architecture [CORBA]
• CPC Class Codes: H04L 41/0659 by isolating or reconfiguring faulty entities
• CPC Class Codes: H04L 41/0681 Configuration of triggering conditions
• CPC Class Codes: H04L 41/0803 Configuration setting
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 49/00 Packet switching elements
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

The present invention provides a network device that fully utilizes the available space in a standard telco rack through the use of multiple mid-planes. Full utilization of available space allows a high switching capacity network device including both physical layer switch/router subsystems and upper layer switch/router subsystems to be fit in one telco rack. Inter-mid-plane connections may be provided by connecting switch fabric cards and/or control processor cards to each of the mid-planes. Providing a multi-layer network device in one telco rack allows for intelligent layer 1 switching (for example, dynamic network connection set up), allows for one network management system to control both layer 1 and upper layer networks and eliminates grooming fees. Compared with separate layer 1 and upper layer network devices or a multi-layer network device occupying multiple telco racks, a single network device saves valuable telco site space and reduces expenses by sharing overhead such as the chassis, power and cooling.

Claims

1. A network device, comprising:

a plurality of ports for data ingress and egress;

a plurality of mid-planes;

a cross-connection subsystem connected to said ports and to at least one of said mid-planes; and

a switch fabric subsystem coupled to each of the plurality of mid-planes,

wherein said cross-connection subsystem is directly and physically connected to at least one of said mid-planes and functions as a physical layer switch which connects on a packet-by-packet basis, and

wherein said switch fabric subsystem functions as an upper layer switch.

2. The network device of claim 1, further comprising:

a control processor card coupled to each of the plurality of mid-planes.

3. The network device of claim 2, wherein the control processor card is an internal control processor card.

4. The network device of claim 1, wherein the switch fabric subsystem comprises one or more printed circuit boards, each of which is coupled to each of the plurality of mid-planes.

5. The network device of claim 1, wherein the plurality of mid-planes comprises a first mid-plane and a second mid-plane.

6. The network device of claim 5, wherein each of the first and second mid-planes comprises a printed circuit board and a plurality of connectors.

7. The network device of claim 5, further comprising:

a first plurality of forwarding subsystems connected to the first mid-plane and coupled to the switch fabric subsystem through the first mid-plane.

8. The network device of claim 7, further comprising:

a second plurality of forwarding subsystems connected to the second mid-plane and coupled to the switch fabric subsystem through the second mid-plane.

9. The network device of claim 5, further comprising:

a first cross-connection subsystem connected to the first mid-plane;

a first plurality of port subsystems connected to the first mid-plane and coupled to the first cross-connection subsystem through the first mid-plane; and

a first plurality of forwarding subsystems connected to the first mid-plane and coupled to the first cross-connection subsystem and the switch fabric subsystem through the first mid-plane.

10. The network device of claim 9, further comprising:

a second cross-connection subsystem connected to the first mid-plane;

a second plurality of port subsystems connected to the first mid-plane and coupled to the second cross-connection subsystem through the first mid-plane; and

a second plurality of forwarding subsystems connected to the first mid-plane and coupled to the second cross-connection subsystem and the switch fabric subsystem through the first mid-plane.

11. The network device of claim 9, further comprising:

a second cross-connection subsystem connected to the second mid-plane;

a second plurality of port subsystems connected to the second mid-plane and coupled to the second cross-connection subsystem through the second mid-plane; and

a second plurality of forwarding subsystems connected to the second mid-plane and coupled to the second cross-connection subsystem and the switch fabric subsystem through the second mid-plane.

12. The network device of claim 10, further comprising:

a third cross-connection subsystem connected to the second mid-plane;

a third plurality of port subsystems connected to the second mid-plane and coupled to the third cross-connection subsystem through the second mid-plane; and

a third plurality of forwarding subsystems connected to the second mid-plane and coupled to the third cross-connection subsystem and the switch fabric subsystem through the second mid-plane.

13. The network device of claim 12, further comprising:

a fourth cross-connection subsystem connected to the second mid-plane;

a fourth plurality of port subsystems connected to the second mid-plane and coupled to the fourth cross-connection subsystem through the second mid-plane; and

a fourth plurality of forwarding subsystems connected to the second mid-plane and coupled to the fourth cross-connection subsystem and the switch fabric subsystem through the second mid-plane.

14. The network device of claim 10, wherein the first and second cross-connection subsystems are coupled together through the first mid-plane.

15. The network device of claim 13, wherein the third and fourth cross-connection subsystems are coupled together through the second mid-plane.

16. The network device of claim 13, wherein the first, second, third and fourth cross-connection subsystems are coupled together through the first and second mid-planes and the switch fabric subsystem.

17. A network device, comprising:

a first mid-plane;

a second mid-plane;

a switch fabric card coupled to the first mid-plane and the second mid-plane;

a first cross-connection card directly and physically connected to the first mid-plane;

a first port card connected to the first mid-plane and coupled to the first cross-connection card through the first mid-plane, said first port card functioning as a physical layer switch which connects on a packet-by-packet basis; and

a first forwarding card connected to the first mid-plane and coupled to the first cross-connection card and the switch fabric card through the first mid-plane,

wherein said switch fabric card and said first forwarding card function as an upper layer switch.

18. The network device of claim 17, further comprising:

a second cross-connection card connected to the second mid-plane;

a second port card connected to the second mid-plane and coupled to the second cross-connection card through the second mid-plane; and

a second forwarding card connected to the second mid-plane and coupled to the second cross-connection subsystem and the switch fabric subsystem through the second mid-plane.

19. The network device of claim 18, further comprising:

a third cross-connection card connected to the first mid-plane;

a third port card connected to the first mid-plane and coupled to the third cross-connection card through the first mid-plane; and

a third forwarding card connected to the first mid-plane and coupled to the third cross-connection subsystem and the switch fabric subsystem through the first mid-plane.

20. The network device of claim 19, further comprising:

a fourth cross-connection card connected to the second mid-plane;

a fourth port card connected to the second mid-plane and coupled to the fourth cross-connection card through the second mid-plane; and

a fourth forwarding card connected to the second mid-plane and coupled to the fourth cross-connection subsystem and the switch fabric subsystem through the second mid-plane.

21. A network device, comprising:

a plurality of ports for data ingress and egress;

a plurality of mid-planes;

a cross-connection subsystem connected to said ports and to at least one of said mid-planes;

a plurality of forwarding cards; and

a switch fabric subsystem coupled to each of the plurality of mid-planes,

wherein said cross-connection subsystem is directly and physically connected to at least one of said mid-planes and functions as a physical layer switch which connects on a packet-by-packet basis, and

wherein said switch fabric subsystem functions as an upper layer switch.