Cabletron Systems SmartSwitch Router, User'S Reference Manual

Page: 39 / 338

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