Cisco 2600XM Series Installation Guide download pdf (Page 13)

LEDs on after powerup; nothing on console

Verify that the baud rate is set to 9600 bps. If that doesn't help, verify that the equipment used for connecting

to the console is operating properly. You can do this by connecting to a known good router to check your

console equipment. If the equipment is successfully tested, but the problem remains, replace the router.

Router boots to ROMmon; no error messages on the console

Set the configuration register to 0x2102 and reload the router:

rommon 1 > confreg 0x2102

rommon 2 > reset

If the router remains in ROMmon, follow the procedure described in ROMmon Recovery for the Cisco 2600

Series Router.

Router boots to ROMmon; error messages on the console

At bootup, one of the following errors may be seen:

device does not contain a valid magic number•

boot: cannot open "flash:"•

boot: cannot determine first file name on device "flash:"•

Error : uncompressed image checksum is incorrect [hex value]•

These mean that either the Flash is empty or the filesystem is corrupted.

To resolve this, copy a valid image onto the Flash. While copying, you will be prompted to erase the old

contents of Flash (if any). Then reload the router. Refer to ROMmon Recovery for the Cisco 2600 Series

Router for instructions on how to copy a valid image into Flash.

Router stops booting after receiving error message

During bootup, the router may display the error message "pre− and post−compression image sizes disagree"

after which booting ceases.

Possible causes include:

corrupted software image•

faulty Flash memory•

faulty DRAM•

bad memory slot•

Begin troubleshooting this issue by copying a new image into Flash. Refer to ROMmon Recovery for the

Cisco 2600 Series Router for instructions on how to copy a valid image into Flash.

If installing a new image fails to resolve the problem, you can try swapping out the memory. If replacing the

Flash and DRAM fails to resolve the problem, there is a chance that the memory slot on the chassis is faulty;

you need to use the TAC Service Request Tool (

registered customers only

) to create a service request in order to

resolve the hardware issue.

Cisco − Hardware Troubleshooting for the Cisco 2600 Series Router

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Cisco 2600XM Series Installation Guide Page 13