Restrictions and Guidelines for Reversible Password Types
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Password type 0 and 7 are replaced with password type 6. So password type 0 and 7, which were used for administrator login to the console, Telnet, SSH, webUI, and NETCONF must be migrated to password type 6. No action is required if username and password are type 0 and 7 for local authentication such as CHAP, EAP, and so on.
Note
Type 6 encrypted password and Autoconversion to password type 6 are supported from is supported from Cisco IOS XE Amsterdam 17.2 and later releases.
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If the startup configuration of the device has type 6 password and you downgrade to a version in which type 6 password is not supported, you will be locked out of the device.