Label switching in fibre channel networks

• US 8,462,790 B2
• Filed: 09/24/2009
• Issued: 06/11/2013
• Est. Priority Date: 04/01/2002
• Status: Active Grant

• 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): Phillips, Hassan
• Assistant Examiner(s): Mais, Mark A
• Application Number:
  US12/566,013
• Publication Number:
  US 20100008375A1
• Time in Patent Office: 1,356 Days
• Field of Search: 370/389, 370/392, 370/394, 370/395.1, 370/397, 370/400, 370/401, 370/409, 370/410, 370/430, 370/464, 370/465, 370/466, 370/470, 370/471, 370/474, 370/475, 370/479, 370/498, 370/395.5
• US Class Current: 370/394
• 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 a fibre channel frame at a first gateway connecting a first fibre channel network to an Internet Protocol (IP) network;

identifying an incoming label associated with the fibre channel frame, the incoming label determined using fibre channel routing mechanisms;

swapping the incoming label associated with the fibre channel frame with an outgoing label, the outgoing label determined by referencing an entry in a label information base associated with the first gateway;

inserting additional labels into the fibre channel frame to establish a tunnel between the first gateway and a second gateway, the additional labels determined using Internet Protocol (IP) routing mechanisms and used to forward the fibre channel frame in the IP network to the second gateway, the second gateway connecting the IP network to a second fibre channel network;

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

2. The method of claim 1, wherein the IP network supports label switching.

3. The method of claim 1, wherein the additional labels correspond to entries in a label information base of the IP network.

4. The method of claim 1, wherein a label indicator is contained in the fibre channel header.

5. The method of claim 1, wherein the second gateway detects that frames transmitted by the first gateway were dropped and requests retransmission of the dropped frames.

6. The method of claim 1, wherein the second gateway removes the control word from the fibre channel frame.

7. The method of claim 1, wherein the first gateway receives a tunnel setup message prior to establishing the tunnel between the first gateway and the second gateway.

8. A system, comprising:

an interface configured to receive a fibre channel frame at a first gateway connecting a first fibre channel network to an Internet Protocol (IP) network;

a processor configured to identify an incoming label associated with the fibre channel frame, the incoming label determined using fibre channel routing mechanisms and swap the incoming label associated with the fibre channel frame with an outgoing label, the outgoing label determined by referencing an entry in a label information base associated with the first gateway;

wherein additional labels are inserted into the fibre channel frame to establish a tunnel between the first gateway and a second gateway, the additional labels determined using Internet Protocol (IP) routing mechanisms and used to forward the fibre channel frame in the IP network to the second gateway, the second gateway connecting the IP network to a second fibre channel network;

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

9. The system of claim 8, wherein the IP network supports label switching.

10. The system of claim 8, wherein the additional labels correspond to entries in a label information base of the IP network.

11. The system of claim 8, wherein a label indicator is contained in the fibre channel header.

12. The system of claim 8, wherein the second gateway detects that frames transmitted by the first gateway were dropped and requests retransmission of the dropped frames.

13. The system of claim 8, wherein the second gateway removes the control word from the fibre channel frame.

14. The system of claim 8, wherein the first gateway receives a tunnel setup message prior to establishing the tunnel between the first gateway and the second gateway.

15. A non-transitory computer readable storage medium having computer code embodied therein, the non-transitory computer readable storage medium, comprising:

computer code for receiving a fibre channel frame at a first gateway connecting a first fibre channel network to an Internet Protocol (IP) network;

computer code for identifying an incoming label associated with the fibre channel frame, the incoming label determined using fibre channel routing mechanisms;

computer code for swapping the incoming label associated with the fibre channel frame with an outgoing label, the outgoing label determined by referencing an entry in a label information base associated with the first gateway;

computer code for inserting additional labels into the fibre channel frame to establish a tunnel between the first gateway and a second gateway, the second gateway connecting the IP network to a second fibre channel network, and the additional labels determined using Internet Protocol (IP) routing mechanisms and used to forward the fibre channel frame in the IP network to the second gateway;

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

16. The non-transitory computer readable storage medium of claim 15, wherein the IP network supports label switching.

17. The non-transitory computer readable storage medium of claim 15, wherein the additional labels correspond to entries in a label information base of the IP network.

18. The non-transitory computer readable storage medium of claim 15, wherein a label indicator is contained in the fibre channel header.

19. The non-transitory computer readable storage medium of claim 15, wherein the second gateway detects that frames transmitted by the first gateway were dropped and requests retransmission of the dropped frames.

20. The non-transitory computer readable storage medium of claim 15, wherein the second gateway removes the control word from the fibre channel frame.