Troubleshooting Scrambled Output When Booting From Rom - Cisco 7603 - Modular Expansion Base Installation Manual

Chapter 4 Troubleshooting
Table 4-5
Table 4-5
Possible Problem
Configuration
register setting is
incorrect
Break key was
pressed during
boot process
Console cable was
inserted or
removed during
boot process, or
console was
power-cycled
during boot
process

Troubleshooting Scrambled Output When Booting from ROM

When the user boots from the ROM, the router displays an indecipherable text on the console.
OL-5077-7
describes solutions for the router frozen in the ROMMON mode.
Booting: Router Is Stuck in ROM Monitor Mode
Solution
At the ROM monitor prompt (>), enter b to boot the system.
1.
If a configuration exists in NVRAM, the system displays a
2.
blank message. Press the Enter key to continue.
If a configuration does not exist in NVRAM, the setup menu
appears. Skip the setup process.
Use the show version command to determine the
3.
configuration register setting.
Look for an invalid configuration register setting. The
4.
default is 0x101, which disables the Break key and forces the
router to boot from ROM. A typical "bad" setting has a 0 in
the least significant bit (for example, 0x100).
5. For details about setting the configuration register, see the
hardware installation and maintenance publication.
At the ROM monitor prompt, enter c to allow the router to
continue booting.
1. Press the Enter key and wait for the ROM monitor prompt
(>).
If the ROM monitor prompt appears, enter c at the prompt to
2.
continue the booting process.
Troubleshooting Router Booting Issues
Cisco 7600 Series Routers Module Guide
4-13