Troubleshooting Network Boot Problems308614-14.20 Rev 00 B-17Maintaining the Router SoftwareThe AN/ANH or ARN router file system resides on the flash memory card, whichis not user serviceable.You use Technician Interface commands to maintain the local file system on theAN/ANH or ARN router flash memory card. For more information, see UsingTechnician Interface Software and Using Technician Interface Scripts.When Technician Interface commands require that you specify a volume, alwaysspecify volume 1 for an AN/ANH or ARN router.Upgrading the Software ImageYou can upgrade an AN/ANH or ARN router’s kernel file (krnl_an.exe for theAN/ANH or krnl_arn.exe for the ARN) using one or both of the followingoptions:• Use Netboot to start the router.This option upgrades the image only in the router’s RAM.• Use TFTP to transfer the image to the router’s flash memory card, then useLocal Boot to start the router.This option upgrades the image in both the router’s flash memory card and inRAM.Caution: Be very careful when you use the format command. This commanderases all files on the local flash memory card, and the AN/ANH or ARNrouter will not be able to local-boot an image or configuration file until youreplace the files. You can avoid this situation by partitioning the flash memorycard. See Using Technician Interface Software or Configuring and ManagingRouters with Site Manager.Caution: If you use TFTP to transfer an upgraded image to an AN/ANH orARN router flash memory card, and the file transfer is interrupted (forexample, if the router resets, reboots, or loses power), the router’s local filesystem on the flash memory card becomes corrupted and the router cannotboot locally until you restore the file system.
