Label switching in fibre channel networks

• US 9,350,653 B2
• Filed: 05/28/2013
• Issued: 05/24/2016
• Est. Priority Date: 04/01/2002
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Lee, Scott S., Dutt, Dinesh G., Edsall, Thomas J.
• Primary Examiner(s): Choi, Eunsook
• Application Number:
  US13/903,580
• Publication Number:
  US 20130343397A1
• Time in Patent Office: 1,092 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 12/4604 LAN interconnection over a backbone network, e.g. Internet, Frame Relay
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]

Abstract

Methods and apparatus are provided for label switched routing in fiber channel networks. Techniques are provided for implementing label switching based on particular characteristics of fiber channel networks. By using label switching, mechanisms such as traffic engineering, security, and tunneling through networks that do not support fiber channel frames can be implemented.

Claims

1. A method comprising:

receiving augmented link state update information at an ingress fibre channel label switching router in a fibre channel network;

using the augmented link state update information, selecting a route from the ingress fibre channel label switching router to an egress fibre channel label switching router in the fibre channel network, the route comprising a plurality of core fibre channel label switching routers in the fibre channel network and the egress fibre channel label switching router; and

generating a tunnel setup message having information identifying the plurality of core fibre channel label switching routers in the route.

2. The method of claim 1, further comprising:

forwarding the tunnel setup message along the route.

3. The method of claim 2, further comprising:

receiving a response corresponding to the tunnel setup message, the response including label information.

4. The method of claim 3, further comprising:

programming the label information into a label information base associated with the ingress fibre channel label switching router.

5. A system comprising:

a processor; and

a memory having stored therein instructions which, when executed by the processor, cause the processor to perform operations comprising;

receiving augmented link state update information via the system, the system comprising an ingress fibre channel label switching router in a fibre channel network;

selecting a route from the ingress fibre channel label switching router to an egress fibre channel label switching router in the fibre channel network, the route comprising a plurality of core fibre channel label switching routers in the fibre channel network and the egress fibre channel label switching router, the route being selected based on the augmented link state update information; and

generating a tunnel setup message having information identifying the plurality of core fibre channel label switching routers in the route.

6. The system of claim 5, the memory storing additional instructions which, when executed by the processor, result in an operation comprising forwarding the tunnel setup message along the route.

7. The system of claim 5, the memory storing additional instructions which, when executed by the processor, result in an operation comprising receiving a response corresponding to the tunnel setup message, the response including label information.

8. The system of claim 5, wherein the memory additionally stores a label information base having label information associated with the ingress fibre channel label switching router.

9. A method comprising:

receiving a fibre channel frame at a first gateway connecting a fibre channel network to a second network that does not support fibre channel frames;

identifying an incoming label associated with the fibre channel frame;

identifying an outgoing label for forwarding the fibre channel frame, the outgoing label determined by referencing an entry in the label information base associated with the first gateway;

inserting the outgoing label to the fibre channel frame;

inserting additional labels into the fibre channel frame to establish a tunnel between the first gateway and a second gateway, the additional labels used to forward the fibre channel frame, via the tunnel, to the second gateway through the second network that does not support fibre channel frames; and

forwarding the fibre channel frame to a next hop, wherein the next hop uses the outgoing label to route the fibre channel frame.

10. The method of claim 9, wherein at least one of the first gateway or the second gateway comprises a fibre channel switch.

11. The method of claim 9, wherein a plurality of labels for forwarding the fibre channel frame are added to the fibre channel frame.

12. The method of claim 9, further comprising:

inserting a control word into the fibre channel frame, the control word used to reorder frames received out of order at the second gateway.

13. The method of claim 9, wherein the additional labels correspond to entries in a label information base of the second network.

14. The method of claim 9, wherein the second gateway connects the second network to another fibre channel network, and wherein the second network comprises an IP network.

15. The method of claim 12, wherein the second gateway removes the control word from the fibre channel frame.

16. The method of claim 9, wherein the first gateway receives a tunnel setup message prior to establishing the tunnel between the first gateway and the second gateway.

17. A system, comprising:

a processor; and

a computer-readable storage medium having stored therein instructions which, when executed by the processor, cause the processor to perform operations comprising;

receiving a fibre channel frame by the system, the system comprising a first gateway connecting a fibre channel network to a second network that does not support fibre channel frames;

identifying an outgoing label for forwarding the fibre channel frame, the outgoing label determined by referencing an entry in the label information base associated with the first gateway;

inserting the outgoing label to the fibre channel frame;

inserting additional labels into the fibre channel frame to establish a tunnel between the first gateway and a second gateway, the additional labels used to forward the fibre channel frame, via the tunnel, to the second gateway through the second network that does not support fibre channel frames; and

forwarding the fibre channel frame to a next hop, wherein the next hop uses the outgoing label to route the fibre channel frame.

18. The system of claim 17, wherein the additional labels correspond to entries in a label information base of the second network.

19. The system of claim 17, further comprising inserting a control word into the fibre channel frame, the control word used to reorder frames received out of order at the second gateway.

20. The system of claim 17, wherein the second gateway removes the control word from the fibre channel frame.