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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

tacacs-server optional-passwords — global

Synopsis

tacacs-server optional-passwords
no tacacs-server optional-passwords

Configures

Password authentication

Default

Disabled

Description

This command makes the user’s password optional, depending on the TACACS server’s configuration. When this feature is enabled, the router tries to authenticate the user with the username only. If that fails, the router tries again with both the username and password.

This command is for TACACS and extended TACACS only; it does not work with TACACS+.

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