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Hitless software upgrades

  • US 9,378,005 B2
  • Filed: 04/12/2013
  • Issued: 06/28/2016
  • Est. Priority Date: 12/28/2005
  • Status: Expired due to Fees
First Claim
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1. A system comprising:

  • a first processor; and

    a second processor;

    wherein the first processor is configured to operate, using a first image, in an active mode and the second processor is configured to operate, using the first image, in a standby mode while the first processor is operating in the active mode;

    wherein the first processor is capable of performing a set of functions while operating in the active mode;

    wherein the second processor is not capable of performing the set of functions while operating in the standby mode; and

    wherein in response to a signal;

    the first processor is configured to cease operating in the active mode;

    the second processor is configured to, using the first image, start operating in the active mode when the first processor ceases operating in the active mode, wherein the second processor is capable of performing the set of functions while operating in the active mode;

    the first processor is configured to boot with a second image, the second image being different from the first image, and subsequent to booting with the second image start operating in the standby mode using the second image, wherein the first processor is not capable of performing a second set of functions while operating in the standby mode;

    the second processor is configured to cease operating in the active mode;

    the first processor is configured to, using the second image, start operating in the active mode when the second processor ceases operating in the active mode, wherein the first processor is capable of performing the second set of functions when operating in the active mode; and

    the second processor is configured to boot with the second image, and subsequent to booting with the second image start operating in the standby mode using the second image, wherein the second processor is not capable of performing the second set of functions while operating in the standby mode.

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