SYSTEM AND METHOD FOR ACCELERATED SOFTWARE UPGRADES

• US 20150040115A1
• Filed: 07/31/2014
• Published: 02/05/2015
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: Arista Networks, Inc.
• Original Assignee: Arista Networks, Inc.
• Inventors: Capper, Simon Francis
• Granted Patent: US 9,141,373 B2
• Time in Patent Office: Days
• US Class Current: 717/171
• CPC Class Codes: G06F 8/63 Image based installation; Cloning; Build to order
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57
• CPC Class Codes: G06F 9/4401 Bootstrapping security arrangements therefor G06F21/57
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46

Abstract

A method and apparatus of a device that updates a software image for a network element is described. In an exemplary embodiment, a device receives a signal to update the network element with the new software image, where the network element includes a plurality of hardware forwarding engines and a control plane. The device further boots the control plane with the new software image, where the booting is accomplished without restarting the control plane. In one embodiment, the device boots the control plane by chain booting from a current software image to the new software image. The device additionally restarts and reconfigures the plurality of hardware forwarding engines. In a further embodiment, the device additionally prefills one or more queues in the hardware forwarding engines with keep-alive messages. These keep-alive messages are transmitted during the time that the control plane is being restarted. In a further embodiment, the hardware forwarding engines are reconfigured without restarting them.

Claims

1. A non-transitory machine-readable medium having executable instructions to cause one or more processing units to perform a method to update a network element with a new software image, the method comprising:

receiving a signal to update the network element with the new software image, wherein the network element includes a plurality of hardware forwarding engines and a control plane;

chain booting the control plane with the new software image, wherein the chain booting is accomplished without restarting the hardware forwarding engines; and

restarting the plurality of hardware forwarding engines after the control plane has completed booting the new software image.

2. The non-transitory machine-readable medium of claim 1, further comprising:

assuming control of the plurality of hardware forwarding engines.

3. The non-transitory machine-readable medium of claim 1, wherein the booting of the control plane is a chain boot from a current software image to the new software image.

4. The non-transitory machine-readable medium of claim 1, wherein the new software image is a different version of the current software image.

5. The non-transitory machine-readable medium of claim 1, further comprising:

prefilling a queue in the hardware forwarding engines with a keep-alive message for a network service prior to chain booting of the control plane.

6. The non-transitory machine-readable medium of claim 5, further comprising:

identifying the network service as a service that uses the keep-alive message.

7. The non-transitory machine-readable medium of claim 6, wherein the network service will send a keep-alive message during the time period in which the control plan is chain booting the new software image.

8. The non-transitory machine-readable medium of claim 5, wherein the keep-alive message is a message sent by one device to another device to check that the network service between the two devices is operating.

9. The non-transitory machine-readable medium of claim 5, wherein the keep-alive message is transmitted during the time in which the control plane is restarting.

10. A non-transitory machine-readable medium having executable instructions to cause one or more processing units perform a method to update a network element with a new software image, the method comprising:

receiving a signal to update the network element with the new software image, wherein the network element includes a plurality of hardware forwarding engines, a data plane, and a control plane;

booting the control plane with the new software image, wherein the booting is accomplished without restarting the hardware forwarding engines; and

updating the plurality of hardware forwarding engines, wherein the updating occurs without an interruption to a network processing function of the data plane.

11. The non-transitory machine-readable medium of claim 10, wherein the updating of the plurality of hardware forwarding engines comprises:

analyzing a hardware table of one of the hardware forwarding engines; and

re-programming the hardware table using the new software image based on the analysis.

12. The non-transitory machine-readable medium of claim 11, wherein the analyzing comprises:

analyzing the hardware table for content and structure of the hardware table.

13. A method to update a network element with a new software image, the method comprising:

receiving a signal to update the network element with the new software image, wherein the network element includes a plurality of hardware forwarding engines and a control plane;

booting the control plane with the new software image, wherein the booting is accomplished without restarting the hardware forwarding engines; and

restarting the plurality of hardware forwarding engines after the control plane has completed booting the new software image with the new software image.

14. The method of claim 13, further comprising:

assuming control of the plurality of hardware forwarding engines.

15. The method of claim 13, wherein the booting of the control plane is a chain boot from a current software image to the new software image.

16. The method of claim 13, wherein the new software image is a different version of the current software image.

17. The method of claim 13, further comprising:

prefilling a queue in a hardware forwarding engines with a keep-alive message for a network service.

18. The method of claim 17, further comprising:

identifying the network service as a service that uses the keep-alive message.

19. The method of claim 18, wherein the network service will send a keep-alive message during the time period in which the control plane is rebooting.

20. A network element comprising:

a new software image;

a plurality of hardware forwarding engines; and

a control plane, coupled to the plurality of hardware forwarding engines, that updates the network element with the new software image, the control engine including,

a receive signal module, wherein the receive signal module receives a signal to update the network element with the new software image,

a chain boot module, coupled to the receive signal module, wherein chain boot module boots the control plane with the new software image and the booting is accomplished without restarting the plurality of hardware forwarding engines, and

a restart hardware forwarding engine module, coupled to the chain boot module, wherein the restart hardware forwarding engine restarts the plurality of hardware forwarding engines.