I don't know about renaming it, but you should be able to copy it either 
to a TFTP server or back to flash if you have enough memory.

Something like

copy flash:vlan.dat flash:vlan.old

moreejt@pcxperience.com wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Thank you everyone.
>
> we did a config clear all and some other things.  The switch is allowing
> systems to talk to each other now but the vlans and some other stuff
> that was previously configured is still configured.
>
> Can I rename the vlan.dat file so as recover it if needed?
>
> We've made progress but managed to get it stuck at the rommon prompt.
> It won't autoboot.  I have to type boot manually.
>
> VERY stupidly I did not copy down the config-register parameter which
> was originally 0x81008 or something like that.  We have been toggling it
> between 2142 and 2102 as part of recovery efforts.  I don't know what to
> put it back to.
>
> - --
> JT Morée
> PC Xperience, Inc.
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> =V9no
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>   

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