HP ProCurve 6120G/XG Manual page 160

TACACS+ Authentication
Configuring TACACS+ on the Switch
Figure 4-4. Advanced TACACS+ Settings Section of the TACACS+ Server User Setup
Then scroll down to the section that begins with "Shell" (See Figure 4-5).
Check the Shell box.
Check the Privilege level box and set the privilege level to 15 to allow "root"
privileges. This allows you to use the single login option.
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