Methods and devices for exchanging peer parameters between network devices

• US 8,605,624 B2
• Filed: 08/29/2008
• Issued: 12/10/2013
• Est. Priority Date: 11/27/2002
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Desai, Tushar, Gupta, Shashank, Jain, Praveen, Ghosh, Kalyan K.
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): DUONG, CHRISTINE T
• Application Number:
  US12/202,004
• Publication Number:
  US 20080316942A1
• Time in Patent Office: 1,929 Days
• Field of Search: None
• US Class Current: 370/255
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/0853 by actively collecting configuration information or by backing up configuration information
• 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]
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

Methods and devices are provided for detecting whether peer ports interconnecting two network devices can perform a novel protocol called Exchange Peer Parameters (“EPP”). If the peer ports are so configured to perform EPP, EPP services are exchanged between the peer ports. In a first phase, information is exchanged about peer port configurations of interest. In a second phase, the results of the exchange of information are applied to hardware and/or software of the respective ports, as needed.

Claims

1. A method, comprising:

determining, by a first port of a first network device, that a second port of a second network device supports a protocol to be used to exchange configuration information, wherein the protocol is supported by the first port;

exchanging configuration information by the first port of the first network device with the second port using the protocol after determining, by the first port of the first network device, that the second port supports the protocol; and

automatically configuring the first port according to the exchanged configuration information;

wherein automatically configuring the first port according to the exchanged configuration information comprises automatically configuring the first port to support virtual storage area network (VSANs) that are supported by both the first port and the second port.

2. The method of claim 1, wherein the determining step comprises exchanging information with the second port via Exchange Link Parameter protocol or via Exchange Switch Capability protocol.

3. The method of claim 1, wherein the exchanging step comprises exchanging frames with the second port in type-length-value format or in a fixed frame length format.

4. The method of claim 1, wherein the configuration information comprises trunk mode information.

5. The method of claim 1, further comprising causing the second port to be configured according to the exchanged information.

17. The method of claim 1, wherein the protocol is the Exchange Peer Parameters protocol.

18. The method of claim 1, wherein the configuration information comprises virtual storage area network information, wherein exchanging configuration information by the first network device with the second port using the protocol after determining that the second port supports the protocol comprises:

receiving configuration information from the second port, wherein the configuration information comprises virtual storage area network information indicating one or more virtual storage area networks (VSANs) that are supported by the second port.

19. The method as recited in claim 18, wherein exchanging configuration information by the first network device with the second port using the protocol after determining that the second port supports the protocol further comprises:

sending configuration information to the second port, wherein the configuration information comprises virtual storage area network information indicating one or more VSANs that are supported by the first port.

21. The method as recited in claim 1, wherein exchanging configuration information by the first network device with the second port using the protocol after determining that the second port supports the protocol comprises receiving configuration information from the second port and wherein automatically configuring the first port according to the exchanged configuration information comprises automatically configuring the first port according to the received configuration information.

22. The method as recited in claim 21, wherein exchanging configuration information by the first network device with the second port using the protocol after determining that the second port supports the protocol further comprises sending configuration information associated with the first port to the second port, thereby enabling the second port to be automatically configured according to the configuration information that has been sent to the second port.

23. The method as recited in claim 1, wherein the first network device is a first switch and the second network device is a second switch.

6. A method, comprising:

determining, by a first port of a first network device, that a second port of a second network device supports Exchange Peer Parameters protocol;

exchanging configuration information with the second port using Exchange Peer Parameters protocol; and

automatically configuring the first port according to the exchanged information;

wherein the configuring step comprises configuring the first port to enable transmission of frames to the second port in Extended Interswitch Link format.

7. An apparatus, comprising:

means for determining by a second port of a second network device that a first port of a first network device supports a protocol to be used to exchange configuration information, wherein the protocol is supported by the second port of the second network device;

means for exchanging configuration information by the second port with the first port using the protocol after determining by the second port of the second network device that the first port of the first network device supports the protocol; and

means for configuring a second port of the second network device according to the exchanged configuration information;

wherein configuring the second port of the second network device according to the exchanged configuration information comprises configuring the second port to support VSANs that are supported by both the first port and the second port.

8. An apparatus, comprising:

a first port;

a memory; and

a processor, at least one of the memory or the processor being configured to do the following;

determine, by the first port, that a second port of a second network device supports a protocol to be used to exchange configuration information, wherein the protocol is supported by the first port;

exchange configuration information by the first port with the second port using the protocol after determining, by the first port, that the second port supports the protocol; and

configure the first port according to the exchanged configuration information, wherein the first port is configured to support VSANs that are supported by both the first port and the second port.

9. The apparatus of claim 8, wherein the processor is configured to exchange information, via the first port, with the second port using Exchange Link Parameter protocol or using Exchange Switch Capability protocol.

10. The apparatus of claim 8, wherein the processor is configured to exchange frames, via the first port, with the second port in type-length-value format or in a fixed frame length format.

11. The apparatus of claim 8, wherein the configuration information comprises virtual storage area network information or trunk mode information.

12. The apparatus of claim 8, wherein the processor is further configured to cause the second port to be configured according to the exchanged information.

14. A line card comprising the apparatus of claim 8.

15. A network device comprising the apparatus of claim 8.

13. An apparatus, comprising:

a first port;

a memory; and

a processor, at least one of the memory or the processor being configured to do the following;

determine, via information exchanged via the first port, that a second port supports Exchange Peer Parameters protocol;

exchange, via the first port, configuration information with the second port using Exchange Peer Parameters protocol; and

automatically configure the first port according to the exchanged information;

wherein the processor is configured to enable the first port to transmit frames to the second port in Extended Interswitch Link format.

16. A method, comprising:

determining, by a first port of a first network device, whether a second port of a second network device supports Exchange Peer Parameters protocol, wherein the first port of the first network device supports the Exchange Peer Parameters protocol; and

if the first port of the first network device determines that the second port of the second network device supports the Exchange Peer Parameters protocol, exchanging configuration information with the second port using the Exchange Peer Parameters protocol and automatically configuring the first port according to the exchanged information;

wherein the configuring step comprises configuring the first port to enable transmission of frames to the second port in Extended Interswitch Link format.

20. An apparatus, comprising:

a first port;

a memory; and

a processor, at least one of the memory or the processor being configured to do the following;

determining, by the first port, that a second port of a second network device supports a protocol to be used to exchange configuration information, wherein the protocol is supported by the first port;

exchanging configuration information by the first port with the second port using the protocol after determining, by the first port, that the second port supports the protocol; and

automatically configuring the first port according to the exchanged configuration information;

wherein only VSANs that are supported by both the first port and the second port are permitted to send frames on a link between the first port and the second port.

24. A method comprising:

exchanging configuration information by a first port of a first network device with a second port of a second network device, wherein exchanging configuration information includes;

sending first configuration information to the second port, wherein the first configuration information comprises virtual storage area network information indicating one or more VSANs that are supported by the first port, and

receiving second configuration information from the second port, wherein the second configuration information comprises virtual storage area network information indicating one or more virtual storage area networks (VSANs) that are supported by the second port;

identifying one or more VSANs that are supported by both the first port and the second port by comparing the VSANs supported by the first port with the VSANs supported by the second port; and

automatically configuring the first port according to the exchanged configuration information by automatically configuring the first port to support the VSANs that are supported by both the first port and the second port.