AAA Authentication Commands

[gfiguereo]

Which command i need to enable in a CATOS 6.1(1b)

to log in to the Switch by console without authentication in the case that the Switch cannot reach the Tacacs+ Server ?

[gfullage]

This should help you out:

http://www.cisco.com/en/US/tech/tk583/tk642/technologies_tech_note09186a0080094ea4.shtml

Specifically, look at the first dot-point in Step A, this tells you exactly what you're after.

[aslam]

You can use the command

set authentication login tacacs none

this should do it for you.

Aslam.