topic Re: Collecting core dump on CISCO 4451 router - TFTP timing out in Routing and SD-WAN

Collecting core dump on CISCO 4451 router - TFTP timing out

stork — Sun, 04 Apr 2021 13:56:07 GMT

I'm trying to copy a core dump from my Cisco 4451 router, but it keeps timing out when the file is almost done being transferred.

> copy bootflash:/core/<core dumbe> tftp: < server IP>

> timeout error occurs once the file is almost complete.

Is there something that can be done to prevent this or is the file just too big and I need to get someone to console in and copy to a usb device or something?

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

Leo Laohoo — Sun, 04 Apr 2021 14:03:18 GMT

Archive the files in the coredump folder and then export it out.

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

stork — Sun, 04 Apr 2021 14:11:50 GMT

I don't suppose you could point me in the right direction of some documents for doing this on the router.

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

Georg Pauwen — Sun, 04 Apr 2021 17:12:08 GMT

Hello,

you could try and change the TFTP blocksize. Try different values...

4451(config)#ip tftp blocksize

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

Leo Laohoo — Sun, 04 Apr 2021 23:08:53 GMT

@stork wrote:

I don't suppose you could point me in the right direction of some documents for doing this on the router.

archive tar /create <FILENAME>.tar bootflash:/core

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

stork — Mon, 05 Apr 2021 12:33:35 GMT

All this did was may a bigger file, which is the issue I believe.

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

Georg Pauwen — Mon, 05 Apr 2021 12:42:39 GMT

Hello,

not sure which TFTP server software you are using, but try the Solarwinds server, maybe it is the software that causes your problem...

https://www.solarwinds.com/free-tools/free-tftp-server

Re: Collecting core dump on CISCO 4451 router - TFTP timing out

stork — Mon, 05 Apr 2021 17:49:11 GMT

Well Solarwinds worked! I was using 3CDaemon. Was going to try the blocksize next but didn't need to this time.