SmartSwitch Router User Reference Manual 39Chapter 1: SSR Product OverviewDisabling a Function or FeatureThe CLI provides for an implicit negate. This allows for the “disabling” of a feature orfunction which has been “enabled”. Use the negate command on a specific line of theactive configuration to “disable” a feature or function which has been enabled. Forexample, Spanning Tree Protocol is disabled by default. If after enabling Spanning TreeProtocol on the SmartSwitch Router, you want to disable STP, you must specify the negatecommand on the line of the active configuration containing the stp enable command.Loading System Images and Configuration FilesThe SSR contains an internal flash on the Control Module and an external PC flash. Theinternal flash contains the SSR boot image and user defined configuration files. Anexternal PC flash contains the system image executed by the Control Module. When anSSR boots, the boot image is executed first, followed by the system image and finishingwith a configuration file.Boot and System ImageOnly one boot image exists on the internal flash of the SSR Control Module. Multiplesystem images can be stored on the external PC flash.Configuration FilesThe SSR uses three special configuration files:• Active – The commands from the Startup configuration file and any configurationcommands that you have made active from the scratchpad (see below).Caution: The active configuration remains in effect only during the current power cycle. Ifyou power down or reboot the SSR without saving the active configuration changes to theStartup configuration file, the changes are lost.• Startup – The configuration file that the SSR uses to configure itself when the systemis powered on.• Scratchpad – The configuration commands you have entered during a managementsession. These commands do not become active until you explicitly activate them.Because some commands depend on other commands for successful execution, theSSR scratchpad simplifies system configuration by allowing you to enter configurationcommands in any order, even when dependencies exist. When you activate thecommands in the scratchpad, the SSR sorts out the dependencies and executes thecommand in the proper sequence.
