Apparatus and method for preventing disruption of fibre channel fabrics caused by ReConfigure Fabric (RCF) messages

• US 7,808,924 B2
• Filed: 05/24/2002
• Issued: 10/05/2010
• Est. Priority Date: 05/24/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: DeSanti, Claudio, Di Benedetto, Marco
• Primary Examiner(s): Sam; Phirin
• Application Number:
  US10/155,698
• Publication Number:
  US 20030218986A1
• Time in Patent Office: 3,056 Days
• Field of Search: 370/254
• US Class Current: 370/254
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0039 Electrical control

Abstract

An apparatus and method for preventing the disruption of Fiber Channel Fabrics caused by ReConfigure Fabric (RCF) messages is disclosed. The apparatus includes a storage area network and a plurality of Fiber Channel Switches arranged in a Fabric. Each of the plurality of Switches includes logic to selectively configure their Ports to either reject or accept RCF messages. When configured to reject RCF messages, the Switch Port that receives an RCF message will generate a reject message along with a reason code explanation “E_Port Isolated”, and then transition into an Isolated state. When the Switch that generated the RCF message receives the reject message, its Port also transition into the Isolated state. In accordance with the method of the present invention, either a Storage Service Provider or a client can access the Switches of the Fabric through either a command line interpreter or a management application. Once access to the Fabric is established, the logic of the Ports of the Switches can be selectively configured to reject or accept RCF messages as described above.

Claims

1. A method, comprising:

at a Fibre Channel Switch of a Fabric of a storage area network, receiving a request to configure one or more Ports of the Fibre Channel Switch to reject ReConfigure Fabric messages; and

configuring the one or more Ports of the Fibre Channel Switch to reject ReConfigure Fabric messages,

wherein the Fibre Channel Switch prevents the Fabric from being disrupted by configuring the one or more Ports to reject the ReConfigure Fabric messages; and

wherein the storage area network is configured to enable a plurality of clients to access the Fabric.

2. The method of claim 1, wherein the request to configure the one or more Ports to reject ReConfigure Fabric messages is sent by a Storage Service Provider.

3. The method of claim 1, wherein the request to configure the one or more Ports to reject ReConfigure Fabric messages is sent by a client.

4. The method of claim 1, wherein the Fibre Channel Switch is capable of rejecting ReConfigure Fabric messages by configuring the one or more Ports to reject the ReConfigure Fabric messages.

5. The method of claim 1, wherein the configuring the one or more Ports of the Fibre Channel Switch to reject ReConfigure Fabric messages includes configuring the one or more Ports to generate a reject message with a reason code explanation “

E_Port Isolated”

when ReConfigure Fabric messages are received.

6. The method of claim 1, wherein the request to configure the one or more Ports to reject ReConfigure Fabric messages is initiated through a command line interpreter or a management application.

7. The method of claim 6, wherein the request to configure the one or more Ports of the Switches of the Fabric to reject the ReConfigure Fabric messages is initiated by an action that relates to managing the Fabric.

8. The method of claim 1, wherein a request to the Fibre Channel Switch to reconfiguring the one or more Ports of the Fibre Channel Switch of the Fabric to accept ReConfigure Fabric messages is initiated by an explicit action that relates to managing the Fabric.

9. The method of claim 1, wherein the Fibre Channel Switch uses one of the following types of protocols to send and receive communications over the Fabric:

Fibre Channel, or Fibre Channel over the Internet Protocol (FCIP), or Fibre Channel over any other technology.

10. A method comprising:

at a Fabric of a storage area network, supporting a plurality of Switches;

transmitting communications to and from a plurality of clients who use the Fabric; and

denying the clients the ability to disrupt the Fabric when performing actions that invoke ReConfigure Fabric messages,

wherein the denying the clients the ability to disrupt the Fabric includes configuring the Ports of the Switches of the fabric to reject the ReConfigure Fabric messages.

11. The method of claim 10, wherein the Fabric uses one of the following types of protocols to conduct communications within the Fabric:

Fibre Channel, or Fibre Channel over the Internet Protocol (FCIP), or Fibre Channel over any other technology.

12. The method of claims 11, further comprising the Fabric logically isolating an E_Port which received a ReConfigure Fabric message from a client Switch.

13. The method of claim 11, wherein the denying the clients the ability to disrupt the Fabric includes configuring the Ports of the Switches of the Fabric to generate a reject message with a reason code explanation “

E_Port Isolated”

when ReConfigure Fabric messages-are received.

14. A method to configure a plurality of Fibre Channel Switches arranged in a Fabric of a storage area network, comprising:

at a Fabric of a storage area network, permitting an administrator to establish a connection to the Fabric, the Fabric including a plurality of Switches; and

transmitting messages from the administrator to the Switches requesting that the Switches configure one or more of their Ports to reject ReConfigure Fabric messages,

wherein the Fabric prevents itself from being disrupted when an ReConfigure Fabric message occurs by transmitting requests to the Switches to configure the one or more of the Ports to reject ReConfigure Fabric messages.

15. The method of claim 14, wherein the one or more Switches reject ReConfigure Fabric messages by configuring the Ports of the one or more Switches to reject the ReConfigure Fabric messages.

16. The method of claim 15, wherein the configuring the Ports of the one or more Switches to reject ReConfigure Fabric messages includes configuring the Ports to generate a reject message with a reason code explanation “

E_Port Isolated”

when ReConfigure Fabric messages are received.

17. The method of claim 14, wherein the administrator establishes the connection to the Fabric through a command line interpreter or a management application.

18. The method of claim 14, further comprising the Fabric reconfiguring the Ports to accept ReConfigure Fabric messages by an explicit action related to managing the Fabric.

19. An apparatus comprising;

a storage area network with a Fibre Channel Fabric; and

a plurality of Switches arranged in the Fabric, each of the Ports of the plurality of Switches including;

logic to selectively reject ReConfigure Fabric messages,

wherein the logic for the Switches is further configured to substantially prevent the Fabric from being disrupted by ReConfigure Fabric messages when the logic is selected to reject ReConfigure Fabric messages.

20. The apparatus of claim 19, wherein the logic for each Switch causes the E_Port of each Switch to reject ReConfigure Fabric messages when the logic is selected to reject ReConfigure Fabric messages.

21. The apparatus of claim 20, wherein the logic for each Switch causes the E_Port of each Switch to generate a reject message with a reason code explanation “

E_Port Isolated”

when ReConfigure Fabric messages are received and the logic is selected to reject ReConfigure Fabric messages.

22. The apparatus of claim 19, wherein the logic for each Switch is further configured to selectively allow each E_Port to accept ReConfigure Fabric messages respectively.

23. The apparatus of claim 19, further comprising a connection to provide access to the Fabric, the connection providing access from a command line interpreter or a management application.

24. The apparatus of claim 19, wherein the Fabric relies on one of the following types of protocols for communication:

Fibre Channel, or Fibre Channel over the Internet Protocol (FCIP), or Fibre Channel over any other technology.

25. A Switch configured to be included in the Fabric of a storage area network, the Switch comprising:

Switch ports; and

logic to selectively reject ReConfigure Fabric messages,

wherein the logic of the Switch is further configured to substantially prevent the Fabric from being disrupted by ReConfigure Fabric messages when the logic is selected to reject ReConfigure Fabric messages.

26. The Switch of claim 25, wherein the Switch configures the logic to selectively cause an E_Port of the Switch to reject ReConfigure Fabric messages when the logic is selected to reject ReConfigure Fabric messages.

27. The Switch of claim 26, wherein the Switch further configures the logic to cause an E_Port to generate a reject message with a reason code explanation “

E-Port Isolated”

, if an ReConfigure Fabric message is received and the logic is selected to reject ReConfigure Fabric messages.

28. The Switch of claim 25, wherein the Switch configures the logic to allow ReConfigure Fabric messages to be accepted.