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:
- the first network device;
establishing a TCP session with a client device;
receiving via the TCP session, a request for a virtual service over a network;
delivering the request for the virtual service to a server;
sending a server response associated with the virtual service to the client device;
receiving further requests associated with the TCP session from the client device; and
creating, by the second network device, a redirect network session for the TCP session, the second network device being a standby device for the first network device;
delivering, by the first network device, the request for the virtual service to a server;
receiving, from a network administrator, a change designating the second network device as an active device for the virtual service;
receiving, by the second network device, from the server, a server response associated with the virtual service;
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.
1 Assignment
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Accused Products
Abstract
Provided are methods and systems for enabling a planned upgrade or a planned downgrade of a first network device. A method may commence with receiving a request for a virtual service via a Transmission Control Protocol (TCP) session between the first network device and the client device. The method may further include creating, by a second network device being a standby device for the first network device, a redirect network session for the TCP session. The method may continue with delivering, by the first network device, the request for the virtual service to a server. Upon a change designating the second network device as an active device for the virtual service, the second network device may receive, from the server, a server response associated with the virtual service and redirect the server response to the first network device for further sending of the server response to the client device.
334 Citations
19 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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the first network device; establishing a TCP session with a client device; receiving via the TCP session, a request for a virtual service over a network; delivering the request for the virtual service to a server; sending a server response associated with the virtual service to the client device; receiving further requests associated with the TCP session from the client device; and creating, by the second network device, a redirect network session for the TCP session, the second network device being a standby device for the first network device; delivering, by the first network device, the request for the virtual service to a server; receiving, from a network administrator, a change designating the second network device as an active device for the virtual service; receiving, by the second network device, from the server, a server response associated with the virtual service; 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. - 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, the system comprising:
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a first network device to; establish a TCP session with a client device; receive, via the TCP session between the first network device and the client device, a request for a virtual service over a network; deliver the request for the virtual service to a server; receive, from a network administrator, a change designating a second network device as an active device for the virtual service; and send a server response associated with the virtual service to the client device; receive further requests associated with the TCP session from the client device; and deliver the further requests associated with the TCP session to the server until the virtual service is completed; and
the second network device, the second network device being a standby device for the first network device, the second network device;creating a redirect network session for the TCP session; receiving, from the server, the server response associated with the virtual service; redirecting the server response to the first network device in accordance with the redirect network session; receiving further server responses associated with the virtual service from the server; and redirecting the further server responses 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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Specification