Fibre channel switch that enables end devices in different fabrics to communicate with one another while retaining their unique fibre channel domain—IDs

• US 7,876,711 B2
• Filed: 12/24/2008
• Issued: 01/25/2011
• Est. Priority Date: 06/26/2003
• Status: Expired due to Fees

• Current Assignee: Cisco Systems, Inc., Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Banerjee, Subrata, Edsall, Thomas, Raimondo, Bruno, Jain, Ankur, Bergamasco, Davide, Dutt, Dinesh G., Bharadwaj, Rajeev, Gai, Silvano
• Primary Examiner(s): Kumar; Pankaj
• Assistant Examiner(s): Scheibel; Robert C
• Application Number:
  US12/343,843
• Publication Number:
  US 20090141657A1
• Time in Patent Office: 762 Days
• Field of Search: None
• US Class Current: 370/254
• CPC Class Codes: H04L 2212/00 Encapsulation of packets
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/74 Address processing for routing
• CPC Class Codes: H04L 49/357 Fibre channel switches
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

A Fibre Channel Switch which enables end devices in different Fabrics to communicate with one another while retaining their unique Fibre Channel Domain_IDs. The Switch is coupled to a first fabric having a first set of end devices and a second fabric having a second set of end devices. The Switch is configured to enable communication by the first set of end devices associated with the first fabric with the second set of end devices associated with the second set of end devices using the unique Domain_IDs of each of the first set and the second set of end devices. In one embodiment of the invention, the first and second fabrics are first and second Virtual Storage Array Networks (VSANs) respectively. In an alternative embodiment, the first fabric and the second fabric are separate physical fabrics.

Claims

1. A switch comprising:

a first interface connected to a first plurality of devices including a first device in a first virtual storage area network (VSAN), the first plurality of devices having a first domain identifier (D_ID);

a second interface connected to a second plurality of devices including a second device in a second VSAN, the second plurality of devices having a second D_ID;

a processor configured to determine that the first device and the second device reside in a same inter-VSAN, wherein the first D_ID of the first device is exported to the second device upon determining that the first device and the second device reside in the same inter-VSAN.

2. The switch of claim 1, wherein the first D_ID of the first device is exported to the second device upon determining that the second device resides in a transit VSAN.

3. The switch of claim 1, wherein the switch is a border switch.

4. The switch of claim 3, wherein the border switch is configured to be part of both the first fabric and the second fabric.

5. The switch of claim 1, wherein the switch receives a plurality of Fabric Shortest Path First (FSPF) frames.

6. The switch of claim 5, wherein the switch forwards the plurality of FSPF frames to a plurality of devices that reside in the same inter-VSAN.

7. The switch of claim 5, wherein the switch forwards the plurality of FSPF frames to a plurality of devices that reside in a transit VSAN.

8. The switch of claim 1, wherein the switch determines the contents of a name server database exported from the first VSAN to the second VSAN.

9. The switch of claim 1, wherein the switch exchanges Inter-VSAN routing protocol (IVRP) messages with border switches in the first VSAN and the second VSAN.

10. A method comprising:

receiving a first plurality of frames from a first plurality of devices including a first device in a first virtual storage area network (VSAN), the first plurality of devices having a first domain identifier (D_ID), the first plurality of frames received at a fibre channel switch;

receiving a second plurality of frames from a second interface connected to a second plurality of devices including a second device in a second VSAN, the second plurality of devices having a second D_ID;

determining that the first device and the second device reside in a same inter-VSAN, wherein the first D_ID of the first device is exported to the second device upon determining that the first device and the second device reside in the same inter-VSAN.

11. The method of claim 10, wherein the first D_ID of the first device is exported to the second device upon determining that the second device resides in a transit VSAN.

12. The method of claim 10, wherein the switch is a border switch.

13. The method of claim 12, wherein the border switch is configured to be part of both the first fabric and the second fabric.

14. The method of claim 10, wherein the switch receives a plurality of Fabric Shortest Path First (FSPF) frames.

15. The method of claim 14, wherein the switch forwards the plurality of FSPF frames to a plurality of devices that reside in the same inter-VSAN.

16. The method of claim 14, wherein the switch forwards the plurality of FSPF frames to a plurality of devices that reside in a transit VSAN.

17. The method of claim 10, wherein the switch determines the contents of a name server database exported from the first VSAN to the second VSAN.

18. The method of claim 10, wherein the switch exchanges Inter-VSAN routing protocol (IVRP) messages with border switches in the first VSAN and the second VSAN.

19. An apparatus comprising:

means for receiving a first plurality of frames from a first plurality of devices including a first device in a first virtual storage area network (VSAN), the first plurality of devices having a first domain identifier (D_ID), the first plurality of frames received at a fibre channel switch;

means for receiving a second plurality of frames from a second interface connected to a second plurality of devices including a second device in a second VSAN, the second plurality of devices having a second D_ID;

means for determining that the first device and the second device reside in a same inter-VSAN, wherein the first D_ID of the first device is exported to the second device upon determining that the first device and the second device reside in the same inter-VSAN.

20. The apparatus of claim 19, wherein the first D_ID of the first device is exported to the second device upon determining that the second device resides in a transit VSAN.