Granted Patent B2

US 8,111,610 · App. 12/020,059 · Granted Feb 7, 2012

Abstract

Claims (37)

1. A method of flagging a port condition in a network, said network comprising a plurality of ports communicating with each other in a ring configuration and operating in accordance with a high-speed network protocol, said method comprising:

detecting a port condition associated with one of the plurality of ports, said port condition normally triggering a re-initialization of the plurality of ports in said network;

generating a non-intrusive condition flag in response to said port condition, the non-intrusive condition flag identifying a source of the port condition; and

sending the non-intrusive condition flag to each of the plurality of ports in the ring configuration to avoid the re-initialization of the plurality of ports in said network,

wherein the non-intrusive condition flag is recognized by one or more enabled ports and ignored by other ports amongst the plurality of ports, said one or more enabled ports being notified of the source of the port condition from said non-intrusive condition flag.

2. The method as in claim 1 , wherein the condition flag is defined in a manner that is not germane with respect to re-initialization of ports in the network under the network protocol.

3. The method of claim 1 , wherein the condition flag is error-tolerant by repeating the same ordered set in sequence.

4. The method of claim 3 , wherein the condition flag is defined by the same ordered set only twice in sequence to prevent re-transmission.

5. The method of claim 4 , wherein the ordered set that defines the condition flag is characterized by being normally ignored by other ports in the network, except for those ports enabled to recognize the ordered set.

6. The method as in claim 4 , wherein the ordered set is not germane with respect to re-initialization of ports in the network under the network protocol.

7. The method of claim 1 , wherein the port condition comprises a segment stall condition.

8. The method of claim 7 , wherein the second port issues a CLS signal to the first port in response to the segment stall condition.

9. The method of claim 1 , wherein the port condition comprises a port busy condition.

10. The method of claim 9 , wherein a CLS signal is issued in response to the port busy condition.

11. The method of claim 1 , wherein the port condition comprises a user defined condition.

12. The method of claim 1 , wherein the condition flag is introduced into the network by a switch to which the ports are operatively coupled.

13. A loop network comprising a plurality of ports communicating with each other in a ring configuration and operating in accordance with a high-speed network protocol, said network configured for flagging a port condition that normally interrupts operations of the network by triggering a re-initialization of each port in the network, said network further comprising:

a device configured for generating a non-intrusive condition flag in response to said port condition, the condition flag identifying a source of the port condition, the device further configured for sending the non-intrusive condition flag to each of the plurality of ports in the ring configuration to avoid the re-initialization of the plurality of ports in said network,

wherein the condition flag is recognized by one or more enabled ports and ignored by other ports amongst the plurality of ports, said one or more enabled ports being notified of the source of the port condition from said non-intrusive condition flag.

14. The network as in claim 13 , wherein the device is a Fibre Channel switch.

15. A switch in a loop network comprising a plurality of ports communicating with each other in a ring configuration and operating in accordance with a high-speed network protocol, said network configured for flagging a port condition that normally interrupts operations of the network by triggering a re-initialization of each port in the network, said network further comprising:

means for identifying the port condition associated with one of the plurality of ports; and

means for generating a non-intrusive condition flag in response to the port condition, the condition flag identifying a source of the port condition, and for sending the non-intrusive condition flag to each of the plurality of ports in the ring configuration to avoid the re-initialization of the plurality of ports in said network,

wherein the condition flag is recognized by one or more enabled ports and ignored by other ports amongst the plurality of ports, said one or more enabled ports being notified of the source of the port condition from said non-intrusive condition flag.

16. A storage area network (SAN) comprising:

the network of claim 13 ;

at least one server coupled to one of the first and second ports;

at least one storage device coupled to another one of the first and second ports.

17. The storage area network (SAN) as in claim 16 , wherein the network comprises a Fibre Channel network.

18. A method of storage area networking, comprising the steps of:

providing the network of claim 13 ;

coupling at least one server to one of the first and second ports;

coupling at least one storage device to one of the first and second ports.

19. The method of claim 1 , wherein the condition flag is a marker represented by one or more currently-undefined ordered sets under the network protocol.

20. The method of claim 1 , wherein said all other ports remain operating without being interrupted by said non-intrusive condition flag.

21. The network of claim 13 , wherein the condition flag is a marker represented by one or more currently-undefined ordered sets under the network protocol.

22. The switch of claim 15 , wherein the condition flag is a marker represented by one or more currently-undefined ordered sets under the network protocol.

Assignments (8)