CHAPTER
10-209
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
OL-21483-02
10
Troubleshooting Upgrading and Downgrading
Software
This chapter describes techniques that you can use to troubleshoot the upgrading and downgrading of
router software. It includes the following sections:
• Validating and Troubleshooting ROM Monitor Software Installation, page 10-209
• Verifying and Troubleshooting the ROM Monitor Version, page 10-210
• Troubleshooting Upgrading and Downgrading ROM Monitor Software on Cisco CRS-1 Routers,
page 10-213
• Troubleshooting Upgrading and Downgrading Cisco IOS XR Software Packages, page 10-214
Validating and Troubleshooting ROM Monitor Software
Installation
The ROM Monitor (ROMMON) is a bootstrap program that initializes the hardware and boots the
Cisco IOS XR software when you power on or reload a router. The ROMMON software is stored on the
bootflash and the ROMMON variables are stored on NVRAM.
See the following sections for information on troubleshooting ROM Monitor versions and upgrading and
downgrading ROM Monitor:
• “Verifying and Troubleshooting the ROM Monitor Version” section on page 10-210
• “Troubleshooting Upgrading and Downgrading ROM Monitor Software on Cisco CRS-1 Routers”
section on page 10-213
Note A copy of the ROMMON software exists on each card. If a card fails to boot the Cisco IOS XR software,
the ROMMON software takes control and places the card in ROMMON mode. Because a card in
ROMMON mode is not running the Cisco IOS XR software, that card will be unavailable for normal
router operations.
Use the following troubleshooting tips when installing ROMMON software:
• If any node cannot be upgraded successfully or if you see error messages similar to the following
message, try reformatting the bootflash and then repeat the upgrade procedure. See Cisco IOS XR
ROM Monitor Guide for the Cisco CRS-1 Router for information on the bootflash upgrade
procedure.
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