US Patent 7783931 Alternate communication path between ESSNI server and CEC

An enterprise network interface client application and a local, central electronic complex (CEC) in a dual CEC environment implement an alternative method of communication. Upon a send failure of a command to a first CEC in the environment, the command is sent to a second CEC using a CEC to CEC message mechanism. A method of communicating an asynchronous event is implemented between a microcode layer and an enterprise network interface client application in a dual central electronic complex (CEC) environment. A copy of the event is retained. Upon a send failure of the event to a first CEC in the environment, the copy of the event is sent to a second CEC in the environment.