Enabling planned upgrade/downgrade of network devices without impacting network sessions
First Claim
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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Abstract
Exemplary embodiments for enabling planned network changes such as an upgrade or downgrade of a network device are disclosed. The systems and methods provide for planned upgrades and downgrades for network devices without impacting existing network sessions, by utilizing two network devices simultaneously, and creating a redirect network session for a predetermined period of time. In so doing, all network traffic may be gradually transferred to the second network device, until the sessions processed by the first network device time out. The first network device can then be taken offline for upgrade or downgrade, without any disruption to the network service or loss of network traffic.
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Citations
20 Claims
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1. A method for enabling a planned upgrade or a planned downgrade of a first network device, the method comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for enabling a planned upgrade or a planned downgrade of a first network device during a TCP session, the first network device configured to:
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establish a TCP session with a client device; receive a request for a virtual service over a network by the client device; deliver the request for the virtual service over a network to a server; receive a change from a network administrator designating a second network device as an active device for the virtual service, the second network device being a standby device for the first network device, the second device creating a redirect network session for the TCP session based on information associated with the TCP session, 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; receive a redirected server response from the second network device; and send the redirected 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, and wherein 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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory processor-readable medium having instructions stored thereon, which when executed by one or more processors, cause the one or more processors to perform the following operations:
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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, and wherein 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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Specification