Private-config at NVRAM

[lee dongsik]

Does anybody know what these private-config & underlying-config in NVRAM
are and what their purposes are? I looked all over on Cisco CCO site but
couldn't find any relevant information about them.  Thank you.

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IOS 12.0(9)

7500_Router#dir nvram:
Directory of nvram:/

1 -rw- 14285 startup-config
2 ---- 5 private-config
3 -rw- 14285 underlying-config

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