[Option] /Conn[ection] id_or_name;connection_string [[;id_or_name;connection_string]…] [Description] 
(Optional). Specifies that the connection manager with the specified name or GUID is located in the package, and specifies a connection string. This option requires that both parameters be specified: the connection manager name or GUID must be provided in the id_or_name argument, and a valid connection string must be specified in the connection_string argument. For more information, see Integration Services Connections. At run time, you can use the /Connection option to load package configurations from a location other than the location that you specified at design time. The values of these configurations then replace the values that were originally specified. However you can use the /Connection option only for configurations, such as SQL Server configurations, that use a connection manager. To understand how package configurations are applied, see SSIS Package Configurations and Behavior Changes to Integration Services Features in SQL Server 2008 R2.