Multiple media access control (MAC) addresses

• US 8,493,959 B2
• Filed: 08/12/2010
• Issued: 07/23/2013
• Est. Priority Date: 02/14/2006
• Status: Expired due to Fees

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Rupavatharam, Sreekanth
• Primary Examiner(s): Thier, Michael
• Assistant Examiner(s): Elliott, IV, Benjamin H
• Application Number:
  US12/855,506
• Publication Number:
  US 20100306571A1
• Time in Patent Office: 1,076 Days
• Field of Search: 370/312, 370/349, 370/379, 370218-221, 370254-257, 370/389, 370/390, 370/392, 370/395.31, 370/395.32, 370/395.54, 370/432, 370/469, 370/471, 709/208, 709/209, 709/245, 710/110
• US Class Current: 370/349
• CPC Class Codes: H04L 12/40195 by using a plurality of nodes

Abstract

A method for providing multiple media access control (MAC) addresses in a device of a master/slave system may include providing a first MAC address in a MAC address storage of the device. The method may also include providing a second MAC address in a multicast table entry of a multicast hash filter of the device.

Claims

1. A system comprising:

a slave device communicatively connected to a master device in the system,

the slave device including;

a first storage device that stores a real media access control (MAC) address of the slave device,

the real MAC address of the slave device mapping to a real Internet protocol (IP) address associated with the slave device, and

a second storage device that stores a virtual MAC address that is different from the real MAC address of the slave device,

the second storage device being different from the first storage device, and

the virtual MAC address mapping to a real IP address associated with the master device and a virtual IP address associated with the master device, and

when a failure is associated with the master device, the slave device is to;

receive the virtual MAC address from the master device,

store the virtual MAC address in the second storage device,

receive and process information, intended for the master device, based on the virtual MAC address, and

receive administrative services based on the real MAC address of the slave device.

2. The system of claim 1, where the second storage device includes a programmable multicast hash filter that stores the virtual MAC address.

3. The system of claim 1, where the second storage device is contained in a communication interface of the slave device.

4. The system of claim 1, where the master device includes a programmable multicast hash filter that stores the virtual MAC address.

5. The system of claim 1, where, when storing the virtual MAC address, the slave device is to:

store the virtual MAC address in the second storage device when the slave device assumes a role of the master device.

6. The system of claim 1, where the system further comprises:

a different slave device to;

use a real MAC address, of the different slave device, and the virtual MAC address when the slave device fails to assume a role of the master device.

7. The system of claim 1, where the administrative services include one or more of checking interfaces of the slave device, configuring the slave device, or executing diagnostics for the slave device.

8. The system of claim 1, where, when receiving the administrative services, the slave device is to:

receive the administrative services based on the real MAC address of the slave device during a time interval when the slave device assumes a role of the master device after the failure.

9. A method comprising:

storing, in a first storage device of a slave device, a real media access control (MAC) address of the slave device,

the real MAC address of the slave device mapping to a real Internet protocol (IP) address associated with the slave device;

receiving, by the slave device, a virtual MAC Address from a master device,

the virtual MAC address mapping to a real IP address associated with the master device and a virtual IP address associated with the master device;

storing, in a second storage device of the slave device, the virtual MAC address,

the second storage device being different from the first storage device;

using, by the slave device, the real MAC address of the slave device to access administrative services when a failure is associated with the master device; and

using, by the slave device, the virtual MAC address to process traffic, intended for the master device, when the failure is associated with the master device.

10. The method of claim 9,

where the second storage device includes a programmable multicast hash filter, and

where storing the virtual MAC address occurs after the slave device begins to act as the master device.

11. The method of claim 9, further comprising:

using, by a different slave device, the virtual MAC address to process other traffic, intended for the master device, when the slave device fails to operate as the master device.

12. The method of claim 9, where using the real MAC address of the slave device to access the administrative services includes:

determining the real IP address associated with the slave device based on the real MAC address of the slave device, and

accessing the administrative services using the real IP address associated with the slave device.

13. The method of claim 9, further comprising:

storing the virtual MAC address in a multicast hash filter of the master device; and

transmitting the virtual MAC address from the master device to the slave device.

14. The method of claim 13, where transmitting the virtual MAC address comprises:

determining that the master device is inoperable, and

transmitting the virtual MAC address from the master device to the slave device after determining that the master device is inoperable.

15. A non-transitory computer-readable medium storing instructions, the instructions comprising:

one or more instructions that, when executed by at least one processor of a slave device, cause the at least one processor to;

store a real media access control (MAC) address of the slave device in a first storage component of the slave device,

the real MAC address of the slave device mapping to a real Internet protocol (IP) address associated with the slave device;

receive a virtual media access control (MAC) address from a master device,

the virtual MAC address mapping to a real IP address associated with the master device and a virtual IP address associated with the master device;

store the virtual MAC address in a second storage component of the slave device,

the second storage component being different from the first storage component;

use the real MAC address of the slave device to access administrative services; and

use the virtual MAC address to process data, intended for the master device, after a failure of the master device.

16. The non-transitory computer-readable medium of claim 15, where the second storage component includes a programmable multicast hash filter.

17. The non-transitory computer-readable medium of claim 16, where the one or more instructions to store the virtual MAC address include:

one or more instructions that, when executed by the at least one processor, cause the at least one processor to;

store the virtual MAC address in the programmable multicast hash filter after the slave device assumes a role of the master device.

18. The non-transitory computer-readable medium of claim 15, where the master device includes a programmable multicast hash filter that stores the virtual MAC address.

19. The non-transitory computer-readable medium of claim 15, where the one or more instructions to use the real MAC address of the slave device to access the administrative services include:

one or more instructions that, when executed by the at least one processor, cause the at least one processor to;

determine the real IP address associated with the slave device based on the real MAC address of the slave device, and

access the administrative services based on the real IP address associated with the slave device.

20. The non-transitory computer-readable medium of claim 15, where the administrative services include one or more of checking interfaces of the slave device, configuring the slave device, or executing diagnostics for the slave device.