Unable to boot c7204VXR from TFTP

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May 4th, 2007
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I am trying to get a cisco 7204VXR w/ a NPE-225 to boot its IOS image from a tftp server.

I can access the TFTP server just fine. My interface f0/0 and the tftp server are in the same subnet (directly connected).

The boot statement says: boot system tftp <iosname> <IP>

After a reload the router hangs for a long time and then logs a message, that he was unable to load the image via tftp:

%Error opening tftp://<ip>/<image> (Timed out)

and continues to boot the file in the flash.

When I connect a sniffer, I see no packets leaving from the router, so no tftp requests anything.

I already tried several different ways to sell the tftp statement (boot system tftp and boot system tftp://), but nothing changes.

Which interface will the router use to connect to the tftp server? not the onboard interface on the npe?

I am really swamped.

Any help would be greatly appreciated.


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bjornarsb Fri, 05/04/2007 - 07:46
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you need to Enable booting from a Trivial File Transfer Protocol (TFTP) server,

setting the Configuration Register

The configuration register can be set in the configuration mode with the config-register 0x value command. See the following sample output:

Router# configure terminal

Enter configuration commands, one per line. End with CNTRL/Z.

Router(config)#config-register 0x2142



%SYS-5-CONFIG_I: Configured from console by console

Boot Field Meaning


Stays at the system bootstrap prompt (ROM monitor) on a reload or power cycle


Boots the boot helper image as a system image


Full boot process, which loads the Cisco IOS image into flash memory


Specifies a default filename for booting over the network from a TFTP server




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