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Enabling planned upgrade/downgrade of network devices without impacting network sessions

  • US 9,806,943 B2
  • Filed: 04/24/2014
  • Issued: 10/31/2017
  • Est. Priority Date: 04/24/2014
  • Status: Active Grant
First Claim
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1. A method for enabling a planned upgrade or a planned downgrade 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 based on information associated with the TCP session, the second network device being a standby device for the first network device, wherein the information associated with the TCP session is sent by the first network device to the second network device upon establishing the TCP session with the client 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 an active device for the virtual 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, by the second network device, 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,wherein the first network device delivers further requests associated with the TCP session from the client device directly to the server until the virtual service is completed, andwherein the second network device redirects further server responses associated with the redirect network session to the first network device until the virtual service is completed.

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