GarrettCom MNS-6K 4.1.4 - Manual (Page 122)

M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
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[key=] – [optional for add, mandatory with encrypt] when encryption is enabled,
the secret shared key string must be supplied
[mgrlevel=] and [oprlevel=] – [optional] specifies the manager and
operator level as defined on the TACACS+ server for the respective level of login