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Beginner

Unable to upload new IOS file to 3850 switch

I am not able to upload a new IOS file to a 3850 switch currently on 16.6.5. 

 

TFTP transfer fails with: 

%Error opening tftp://10.x.x.x/cat3k_caa-universalk9.16.06.06.SPA.bin (Timed out)

 

Copying from USB fails: 

%Error reading usbflash0:/cisco/cat3k_caa-universalk9.16.06.06.SPA.bin (I/O error)

 

There is more than enough space on the flash. I tried different IOS version files with no success. Also tried different USB sticks and 2 different TFTP servers. 

 

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Community Legend

Re: Unable to upload new IOS file to 3850 switch

Is TFTP block size configured for 8192? Try using TFTP block size of 1468 and try again.
If TFTP block size 1468 works then this is due to CSCvq01204.
11 REPLIES 11
VIP Mentor

Re: Unable to upload new IOS file to 3850 switch

is the USB set to FAT format ?
can the switch ping the TFTP server ? does the same issue happen with FTP ?
Beginner

Re: Unable to upload new IOS file to 3850 switch

Hi Mark, 

 

Yes, the USB is FAT32, and yes, I can ping the TFTP server.

 

I only have this problem on switches on version 16.6.5. I have no problem transferring the file to a switch on an older version like 3.6.8e 

VIP Mentor

Re: Unable to upload new IOS file to 3850 switch

Thats odd that both TFTP and the USB functions are down , im running 16.6.5 but on 9300s have not seen that issue yet , theres no ACL blocking the TFTP protocol , is it the same for FTP too ?

have you tried rebooting the switch ? is the USB even being recognized when you do a dir usb: ?
Not all USBs work so i would try a few different usbs to be sure

i dont see any caveats open relating to the issue on your release notes
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-6/release_notes/ol-16-6-3850.html#pgfId-1246127
Beginner

Re: Unable to upload new IOS file to 3850 switch

I just tried FTP and it worked. Which gives me one working option. 

 

Not sure why TFTP is failing. I will upgrade to the new version and see if TFTP is still messed up. 

 

Thanks for your suggestion 

VIP Mentor

Re: Unable to upload new IOS file to 3850 switch

Thats good , i would upgrade and check the USB function is working too
TFTP could be blocked on the network at some level it is on our global net by multiple security devices
Highlighted

Re: Unable to upload new IOS file to 3850 switch

Hi,

 

Try defining the source interface for the TFTP.

"ip tftp source interface <interface name>"

SD-WAN Specialist
Spooster IT Services
Beginner

Re: Unable to upload new IOS file to 3850 switch

I tried command previously and it didn't make  any change for me

Hall of Fame Community Legend

Re: Unable to upload new IOS file to 3850 switch

Is TFTP block size configured for 8192? Try using TFTP block size of 1468 and try again.
If TFTP block size 1468 works then this is due to CSCvq01204.
Beginner

Re: Unable to upload new IOS file to 3850 switch

Yes, that worked. Thanks a lot Leo. 

 

This bug is reported on 16.6.6, but it looks like it is happening on 16.6.5 as well. 

Hall of Fame Community Legend

Re: Unable to upload new IOS file to 3850 switch


@yuli7641 wrote:

This bug is reported on 16.6.6, but it looks like it is happening on 16.6.5 as well. 


Would it be possible if a TAC Case is raised? 

This would give TAC a sense of "visibility" on how many people are affected by this bug.  Make sure TAC also updates the "known affected version" to include 16.6.5.

Beginner

Re: Unable to upload new IOS file to 3850 switch

Yes, I did have a case regarding this. I will try to get them to update the affected versions 

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