Cisco 6500 Sup 2 MSFC2 re-appearing config

Posted on 2009-04-28
Medium Priority
Last Modified: 2012-08-13

We have recently aquired a second-hand Cisco 6506 with a Sup2 and MFSC2 which is running IOS natively. It arrived with a config already preset which we considered odd at the time. Having had a look at It I think i can see why it arrived with a config present. It doesnt matter how many times I erase the startup-config, create another one, rewrite it back again etc etc, it still retains a good chunk of config including vlans in vtp mode, most annoying!

Looking at the file system, there's a whole chunk of files ive never had the pleasure of meeting before:


Im beginning to wonder if one of these files have a standard config in them which is always applied, acting almost as a factory default.

Before i get too heavy-handed with this lot and start breaking things, does anyone have any advice on how to tackle this?

Many thanks.
Question by:jackstark
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Expert Comment

by:Don Johnston
ID: 24249789
If you do a "erase start" and then reload, it boots up with a configuration?

Author Comment

ID: 24249889
Yes that's right.
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Accepted Solution

Don Johnston earned 1500 total points
ID: 24250174
Never run into that before.


dir nvram:

then delete each file. i.e.

delete nvram:startup-config
delete nvram:private-config

then delete the vlan database

delete const_nvram:vlan.dat

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Author Comment

ID: 24250241
Thanks for the prompt replies. Before i dive in and start deleting, what are the implications of these files being removed, particularly private-config and underlying-config?

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Expert Comment

by:Don Johnston
ID: 24250302
There won't be a configuration. :-)

startup-config the simply the startup configuration.
private-config is used to store things like crypto keys.
vlan.dat is the vlan database file.

Author Comment

ID: 24250383
Thank you...

and underlying-config?
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Expert Comment

by:Don Johnston
ID: 24250741

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