
Troubleshooting Network Boot Problems
114074 Rev. A A-17
Upgrading the Software Image
You can upgrade an AN/ANH’s software image (krnl_an.exe) using one or both of
the following options:
• Use Netboot to start the AN/ANH.
This option upgrades the image only in the AN/ANH’s RAM.
• Use TFTP to transfer the image to the AN/ANH’s local file system, then use
Local Boot to start the AN/ANH.
This option upgrades the image in both the AN/ANH’s local file system and in
memory.
Restoring a Local File System
If the local file system becomes corrupted, you must restore it by upgrading the
software image.
If for any reason the AN/ANH resets, reboots, or loses power while restoring or
compacting its Flash card file system, it automatically Netboots the configuration
file and software image. (Note that you must already have the network set up for
Netboot to succeed.)
After the AN/ANH successfully Netboots, you can use TFTP to restore the
software image and configuration file on the local file system.
Caution: If you use TFTP to transfer an upgraded image to an AN/ANH Flash
card, and an interruption in the file transfer occurs (for example, if the
AN/ANH resets, reboots, or loses power), the AN/ANH’s local file system
becomes corrupted and it cannot boot locally until the file system is restored.
Caution: Compacting the file system on a Flash card can take up to 15
minutes. When you compact a router’s file system, always let compaction
complete before you reset the router.
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