Information About Router Recovery
The standard way to install new software on the Designated Shelf Controller (DSC) is by using the install command in administration EXEC mode. However, if the DSC is unable to boot the Cisco IOS XR software or you want to completely replace the existing software, you can reinstall the software while the DSC is in ROM Monitor mode. When you install the Cisco IOS XR software from ROM Monitor mode, you must use a special software installation file with a vm file extension. These files are called vm files. You cannot install software in package installation envelope (PIE) files from ROM Monitor mode.
![]() Note |
Installation using a vm file in ROM Monitor mode should be performed only from the DSC of the system. |
![]() Caution |
Reinstalling the Cisco IOS XR software from ROM Monitor mode replaces the currently installed router software and causes substantial router downtime. We recommend installing or upgrading software packages from administration EXEC mode using PIE files, as described in the Upgrading and Managing Cisco IOS XR Software module of the System Management Configuration Guide for Cisco CRS Routers . |