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New Member

IOS Upgrade on Cisco 3750

Hi,

Iam doing an upgrade on cisco 3750 to c3750-ipbasek9-mz.122-25.SED1.bin. I notice some circles during the file transfer. But when i do a MD5 check, it looks fine.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!!!!!!!!!!!!!O!!!!!!!!!!!!!O!!!!!!!!!!!!!O!!!!!!!!!!!!!OO!!!!!!!!!!!!!OOO!!!!!!!!!!!!OO!!!!!!!!!!!!!OOO!!!!!!!!!!!!!OO!!!!!!!!!!!!!OOO!!!!!!!!!!!!!OOO!!!!!!!!!!!!OO!!!!!!!!!!!!!OOO!!!!!!!!!!!!!OO!!!!!!!!!

Am i overlooking something? Is there any problem with the file upgrade.

Please advise.

Regards

Navneet

7 REPLIES
Silver

Re: IOS Upgrade on Cisco 3750

There is some intermitent loss in connection to the tftp server while recieving the image.

Do ensure you verify the checksum of the image. Also do a verify bootflash: command on ur switch before reloading.

HTH

Hoogen

Do rate if this helps :)

New Member

Re: IOS Upgrade on Cisco 3750

Hi Hoogen,

Thanx for the Reply. I did a Verify \MD5 checksum and the output is the same.

So i hope it got copied properly.

Cheers

Navneet

Silver

Re: IOS Upgrade on Cisco 3750

Sure it did then. Verify the checksum too.

HTH

Hoogen

Do rate if i have helped :)

New Member

Re: IOS Upgrade on Cisco 3750

Dear Navneet,

I had also faced similar problem . Can u try changing TFTP Software?

regds,

aman

New Member

Re: IOS Upgrade on Cisco 3750

I am facing similar problem. Changing the tftp server did not solve it

Hall of Fame Super Silver

Re: IOS Upgrade on Cisco 3750

Nojeem

The O in the output indicates a problem with a particular packet being transmitted by TFTP. TFTP has logic to retransmit these packets. When the transfer completes if you do a verify on the new image file and it indicates ok then it should be fine.

If you are getting lots of errors like this it could indicate that there are poor quality or other problems on one of the links that you go through. If you are concerned about the validity of the image file after transfer perhaps you might consider using FTP to make the transfer rather than TFTP. Since FTP uses TCP which is a reliable transport (and TFTP uses UDP) there might be some advantage for TCP in environments with high error rate on some link.

HTH

Rick

New Member

Re: IOS Upgrade on Cisco 3750

Thanks Rick. I thought it might be a link issue but same symptons when directly connected to the switch.

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