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ENABLING PLANNED UPGRADE/DOWNGRADE OF NETWORK DEVICES WITHOUT IMPACTING NETWORK SESSIONS

  • US 20150312092A1
  • Filed: 04/24/2014
  • Published: 10/29/2015
  • Est. Priority Date: 04/24/2014
  • Status: Active Grant
First Claim
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1. A method for enabling a planned change of a first network device, the method comprising:

  • establishing at the first network device, a TCP session with a client device;

    receiving, at the first network device, a request for a virtual service over a network by the client device;

    creating a redirect network session for the TCP session at a second network device, the second network device being a standby device;

    delivering, by the first network device, the request for the virtual service over a network to a server;

    receiving a change from a network administrator designating the second network device as the active device for the service;

    receiving a server response at the second network device;

    recognizing, at the second network device, that the server response is associated with the redirect network session;

    redirecting the server response to the first network device in accordance with the redirect network session; and

    sending, by the first network device, the server response to the client device.

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