Manual
Recovery From BTS Router Boot to rommon68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
J-67
Recovery From BTS Router Boot to rommon
Introduction
ROM monitor boot conditions
Under certain circumstances the BTS router will initialize with the ROM
monitor (rommon) operating system rather than the IOS. These
circumstances include:
S IOS file is missing from the CF memory card
S IOS file is not the first file on the CF memory card
S IOS file image on the CF memory card is corrupted
S Startup–config file contains an outdated boot system line specifying
an IOS file which has been replaced with an updated version
S Startup–config file contains boot system line with typographical
error(s) in the IOS filename
Description
Router operation on rommon is signalled by the display of the rommon
# > prompt, where # is a number which increments each time a
command is issued. Rommon is a low–level operating system which
provides limited capabilities for router testing and troubleshooting
operations, but does not support any operations on files beyond viewing
directory contents or booting from a specified file. As a result, files can
not be copied or deleted when the router is operating on rommon.
Recovery methods
Two recovery methods are included in this section. The first is the
simplest and requires that a valid, uncorrupted IOS version is installed
on the CF memory card. The second method requires additional
equipment and must be used in instances such as when an IOS file is not
installed on the CF memory card or the installed IOS image is corrupted.
Simple Recovery from Boot to rommon
Requirements
Unless it is certain, that the IOS image on the CF memory card is
corrupted, this method should always be the first attempted to recover
the router from a rommon initialization. This method does not require
any additional equipment beyond the items necessary to load canned
configuration files into the BTS router. To be effective, this method does
require that a valid, uncorrupted IOS image file is installed on the
router’s CF memory card.
Recovery
Follow the procedure in Table J-15 to attempt a simple recovery from a
BTS router rommon initialization.
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