TFTP Copy Issues

[kylebrogers]

I am trying to copy a new IOS image to a 3825 router.   I have verified that there is significantly more free space in flash than is needed to accommodate the image (83 MB free, new IOS is 34 MB).  I have also verified that the router has the necessary hardware requirements for the new version of IOS, though it is a moot point with this issue.  When I try to copy the image from either TFTPd32 or the Solarwinds TFTP server,the copy gets to about 97% and then shows a mixture of timeouts and out-of-sequence packets (.'s and o's) before telling me the copy job timed out.  I have tried bumping both the "timeout" and "max retransmit" on TFTPd32 to 2-3 times their defaults, but it made no difference.  The router and my laptop are connected to the same 3550.  I have also tried two FTP servers but all I get is "Protocol error" on the router when I try to use either.  I see the following in the TFTP debugs:

Apr  5 19:25:51.054 CDT: TFTP: Sending  ACK for block 689,   socket_id 0x70ADECE4
Apr  5 19:25:51.706 CDT: TFTP: Received block 690, socket_id 0x70ADECE4
Apr  5 19:25:51.706 CDT: TFTP: Sending  ACK for block 690,   socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Received block 691, socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Sending  ACK for block 691,   socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Received block 692, socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Sending  ACK for block 692,   socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Received block 693, socket_id 0x70ADECE4
Apr  5 19:25:51.718 CDT: TFTP: Sending  ACK for block 693,   socket_id 0x70ADECE4.
Apr  5 19:25:54.718 CDT: TFTP: Sending  ACK for block 693,   socket_id 0x70ADECE4.
Apr  5 19:25:58.718 CDT: TFTP: Sending  ACK for block 693,   socket_id 0x70ADECE4.
Apr  5 19:26:03.718 CDT: TFTP: Sending  ACK for block 693,   socket_id 0x70ADECE4O
Apr  5 19:26:07.926 CDT: TFTP: Received block 693, socket_id 0x70ADECE4
Apr  5 19:26:07.926 CDT: TFTP: Sending  ACK for block 693,   socket_id 0x70ADECE4 [timed out]

%Error reading tftp://10.0.0.181/c3825-spservicesk9-mz.124-25e.bin (Timed out)

Anyone have any idea what might be causing this?

[Richard Burts]

I find that for larger image files, such as the one you are attempting to load, that it works better to use FTP rather than TFTP. So my first suggestion would be to try using FTP rather than TFTP.

If you have tried 2 TFTP clients and have tried 2 TFTP servers then it is likely that we can eliminate TFTP client or TFTP server as the cause of the problem. So my second suggestion would be that perhaps the problem is in the image file that you are trying to load. So my second suggestion would be to start over - delete the image file that you are currently working with and start by downloading a new image file from Cisco.

HTH

Rick

[kylebrogers]

As with many things, rebooting the router fixed the problem.  I tried mulitple FTP/TFTP servers and every setting change I could think of on them with no luck.  Once we hit a maintenance window, I rebooted the router and after that it worked the first time.