Methods and apparatus for automatic session validation for distributed access points

• US 9,256,416 B1
• Filed: 03/28/2013
• Issued: 02/09/2016
• Est. Priority Date: 03/28/2013
• Status: Active Grant

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Vemula, Murali, Madasamy, Siva, Ramachandra, Srihari, Kudethur, Pradeep
• Primary Examiner(s): Rampuria, Satish
• Application Number:
  US13/852,602
• Time in Patent Office: 1,048 Days
• Field of Search: 717168-178, 709220-222
• US Class Current: 1/1
• CPC Class Codes: G06F 8/61 Installation
• CPC Class Codes: G06F 8/62 Uninstallation

Abstract

In some embodiments, a method includes installing at an access point that (1) includes a first software image and (2) is operatively coupled to a network controller via network, a second software image different from the first software image. The method includes defining in response to the installation, a virtual client disposed in the access point. The virtual client is configured to send to the network controller via the network a first validation data unit that causes the network controller to send a second validation data unit to the access point if the first validation data unit is received by the network controller. The method also includes installing at the access point that includes the second software image, the first software image and uninstalling the second software image if the access point does not receive the second validation data unit in response to the first validation data unit.

Claims

1. A method, comprising:

installing, at an access point that (1) includes a first software image and (2) is operatively coupled to a network controller via a network, a second software image different from the first software image;

defining, in response to the installing and at the access point, a virtual client configured to send, at a first time and to the network controller via the network, a first validation data unit that causes the network controller to send a second validation data unit to the access point;

sending, to the network controller, a signal indicative of a successful receipt of the second validation data unit if the virtual client receives the second validation data unit at a second time after the first time, the signal indicative of the successful receipt of the second validation data unit being indicative of a time value associated with an elapsed time between the first time and the second time; and

sending, to the network controller, a signal indicative of a failure of a receipt of the second validation data unit if the virtual client does not receive the second validation unit from the network controller.

2. The method of claim 1, wherein the second validation data unit is different than the first validation data unit.

3. The method of claim 1, further comprising if the access point receives the second validation data unit in response to the first validation data unit, sending, to the network controller, a signal indicative of a successful installation of the second software image.

4. The method of claim 1, wherein the virtual client is a first virtual client, the method further comprising defining, at the access point, a second virtual client configured to receive, via the network controller and the network, the second validation data unit.

5. The method of claim 1, further comprising defining a plurality of virtual clients, each virtual client from the plurality of virtual clients configured to send a stream of data units to the network controller, the plurality of virtual clients configured so that a number of virtual clients from the plurality of virtual clients is more than fifty percent of the computing resources of the access point are used.

6. The method of claim 1, further comprising if the access point receives the second validation data unit after a pre-determined time period, sending, to the network controller, the signal indicative of the failure of the receipt of the second validation data unit.

7. An apparatus, comprising:

an access point configured to be operatively coupled to a network controller via a network, the access point including a processor configured to execute a validation module, a first software image, a first virtual client and a second virtual client; and

the first virtual client configured to send a validation data unit via the network controller to the second virtual client,

the validation module configured to send a signal indicative of a successful installation, at the access point, of a second software image, the validation module configured to send the signal in response to receiving an indication that the second virtual client received the validation data unit,

the validation module configured to send, to the network controller, a signal indicative of a failure of a receipt of the second validation data unit if the second virtual client does not receive a subsequent validation unit from the network controller.

8. The apparatus of claim 7, wherein the validation data unit is a first validation data unit, the first virtual client is configured to send a second validation data unit to the second virtual client via a path that excludes the network.

9. The apparatus of claim 7, wherein the first virtual client that is configured to initiate a Dynamic Host Configuration Protocol request such that the first virtual client is configured to communicate via the network.

10. The method of claim 7, wherein the first virtual client is configured to request an internet protocol address for the first virtual client via the network, the internet protocol address being included in the Dynamic Host Configuration Protocol request such that the first virtual client is configured to communicate via the network.

11. The apparatus of claim 7, wherein the validation module is configured to define a plurality of virtual clients, the first virtual client and the second virtual client included in the plurality of virtual clients, each virtual client from the plurality of virtual clients configured to send a stream of data units to the network controller, the plurality of virtual clients configured so that a number of virtual clients from the plurality of virtual clients is more than fifty percent of the computing resources of the access point are used.

12. The apparatus of claim 7, wherein the first virtual client is configured to send the validation data unit at a first time, the first virtual client is configured to send at a second time after the first time, to the network controller, a signal indicative of a status of the software upgrade.

13. A method, comprising:

receiving, at an access point and from a network controller via a network, an indication of a network fault;

defining, in response to the indication and at the access point, a virtual client that is configured to send, to the network controller, a first validation data unit that causes the network controller to send a second validation data unit;

if the access point receives the second validation data unit in response to the first validation data unit, sending, to the network controller, a signal indicative of a receipt of the second validation data unit; and

sending, to the network controller, a signal indicative of a failure of a receipt of the second validation data unit if the virtual client does not receive the second validation unit from the network controller.

14. The method of claim 13, wherein the virtual client is a first virtual client, the method further comprising defining at the access point, a second virtual client that is configured to receive, via the network controller and the network, the second validation data unit.

15. The method of claim 13, further comprising defining the virtual client such that the virtual client configured to request an Internet protocol address for the virtual client via the network, the internet protocol address being included in the first data validation unit.

16. The method of claim 13, wherein the indication of the network fault was initiated by an administrator.

17. The method of claim 13, further comprising if the access point received the second validation data unit after a pre-determined time period in response to the first validation data unit, sending, to the network controller, the signal indicative of the failure of the receipt of the second validation data unit.

18. The method of claim 13, further comprising:

in absence of receiving the second validation unit from the network controller;

uninstalling a first software image installed at the access point; and

installing a second software image previously installed at the access point.