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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
Chapter 3 Installing the Cisco 12404 Internet Router
Configuration Changes
Subinterface Configuration Mode
You can configure multiple virtual interfaces (called subinterfaces) on a single
physical interface. Subinterfaces appear to be distinct physical interfaces to the
various protocols. For detailed information on how to configure subinterfaces, see
the appropriate module for a specific protocol in the Cisco IOS software
documentation.
ROM Monitor Mode
If your router does not find a valid system image, or if you interrupt the boot
sequence, the system might enter read-only memory (ROM) monitor mode. From
ROM monitor mode, you can boot the system or perform diagnostic tests.
You can also enter ROM monitor mode by entering the
reload
EXEC command
and then press the Break key during the first 60 seconds of startup.
Configuration Changes
During the first-time startup of an unconfigured router, the system automatically
starts the
setup
command utility and begins displaying an interactive dialog called
the System Configuration Dialog on the system console screen. The System
Configuration Dialog guides you through the configuration process with prompts
for:
•
Global (system-wide) parameters, and
•
Interface (line card) parameters
The System Configuration Dialog prompts and the order in which they appear on
the screen vary depending on the following:
•
Platform
•
Interfaces installed
•
Router
•
Cisco IOS software image the router is running
todd.book Page 56 Tuesday, November 27, 2007 6:02 PM