Cisco Cisco IOS Software Release 12.0(2a)T1 Guide De Dépannage

Introduction
 Before You Begin
      Conventions
      Prerequisites
      Components Used
 Check Configuration Register Settings
 Look for a Valid Image in Flash
      Download using TFTP from ROMmon
      Download using Xmodem from ROMmon
 Related Information

This page explains how to recover a Cisco 2600 Series Router and a VG200 stuck in ROMmon (

rommon#

..>

 prompt).

For more information on document conventions, see the Cisco Technical Tips Conventions.

There are no specific prerequisites for this document.

This document is not restricted to specific software and hardware versions.

The information presented in this document was created from devices in a specific lab environment. All of the
devices used in this document started with a cleared (default) configuration. If you are working in a live
network, ensure that you understand the potential impact of any command before using it.

If the router is stuck in ROMmon mode, the first setting that should be checked is the value of the
configuration register.

The first four bits of the configuration register comprise the boot field. The value of the boot field defines the
source of a default Cisco IOS® software image that will be used to run the router. If the value of the boot field
is 0 (configuration register value of XXX0), on startup the system enters and remains in the ROM monitor
mode (rommon>), awaiting a user command to boot the system manually. For more information on the