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CiscouBR924 Software Configuration Guide
OL-0337-05 (8/2002)
APPENDIX
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Using Cisco IOS Software

This appendix describes the basics about using the Cisco IOS software that is installed on every
Cisco uBR924 cable access router. This appendix describes the following topics:
•Accessing the Router’s Command-Line Interface
•Understanding the Command-Line Interface
•Understanding Cisco IOS Configuration Files
•Useful Commands
Caution Before attempting to reconfigure the Cisco uBR924 cable access router at a subscriber site, contact your
provisioning or billing system administrator to ensure remote configuration is allowed. To ensure proper
levels of service for all customers, service providers typically disable remote configuration of the cable
modems on their system and allow only the configuration that is specified by the cable provisioning or
billing system.
If remote configuration is disabled, any changes you make do not re main in effect after the
Cisco uBR924 router is powered off and on. Instead, the router returns to its previous configuration. In
some cases, these settings will cause the cable interface to disconnect and may be lost when the cable
interface is reset.

Accessing the Router’s Command-Line Interface

The Cisco uBR924 router’s command-line interface (CLI) can be accessed either through a Telnet
connection over a TCP/IP network or by a direct connection to the router’s console port. See the
following sections for more information.
Note The Cisco uBR924 router also supports accessing the CLI through the Cisco w eb server, but this feature
is automatically disabled when the Cable Monitor is active. See AppendixB, “Using the Cable Monitor
Tool” for details.