upgrading ios on 4500 Supervisor II+

Answered Question
Oct 7th, 2009

I am working at a client site and I need to upgrade the IOS running on a Single Sup II+ engine running in a 4500 Switch chassis. I have searched Cisco specific to the 4500 and I do not get anything back that is specific to performing an IOS upgrade on a Sup II+.

I had an issue with this the last time I tried it about a year ago. I want to make sure I do this properly this time.

I have this problem too.
0 votes
Correct Answer by Edison Ortiz about 7 years 2 months ago

Kevin,

As others indicated, this step was included in the document to prevent customers from getting into rommon mode due to previous incorrect config register setting.

Regards

Edison.

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Kevin Melton Wed, 10/07/2009 - 19:40

Step 6 in this document references setting the config register to 2102. Why do I have to do anything to the config register? The switch is currently running right now on code 12.2(46)SG with no issues. I would not think I would need to change the config register, as I am not in a recovery situation.

Thanks Edison

Kevin

glen.grant Thu, 10/08/2009 - 03:53

If you don't change the register it won't load the code because 0x2101 which is the default says to load the first image it finds in bootflash:. Unless you delete the current image it will always load 12.2.46SG . Changing the register allows you to add the 2nd image into flash and then use a boot statement to point to the new image.

Kevin Melton Thu, 10/08/2009 - 05:15

Thanks for your answer. I actually was planning on deleting the old code and only having it load the new code. That is why I was thinking that I probably did not need to adjust the config-register.

I remember in some disaster recovery situations, I have changed the config-register to 0x2142?... what does that tell it to do?

Thanks again

glen.grant Thu, 10/08/2009 - 08:44

0x2142 tell it to load a default running config with nothing in it . Used for password recovery , you then do a copy start to run and then change the passwords and the config register rback to 0x2101 or 0x2102.

Correct Answer
Edison Ortiz Thu, 10/08/2009 - 05:03

Kevin,

As others indicated, this step was included in the document to prevent customers from getting into rommon mode due to previous incorrect config register setting.

Regards

Edison.

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