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Discussion in 'Networking' started by Rob Cuttell, Apr 13, 2004.

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  1. Rob Cuttell

    Rob Cuttell Thread Starter

    Apr 13, 2004
    While trying to learn about a Cisco series 1900 switch, I enabled TACACS, (whatever that is!) Now when I try to enter Privileged Mode instead of asking for a password, the console says, "No IP address". As I am unable to get into Privileged Mode I am stuck! Any ideas?
  2. plucnik


    Aug 19, 2003
  3. hermes


    Aug 12, 2000
    TACACS is used for AAA services. If you turn it on it will go looking for a TACACS server to authenticate you against.

    Is the switch new or used? Did you use an existing config? I am thinking along the lines that it was set to authenticate users against a TACACS database. It is fairly common for users to set a router or switch up to authenticate users then lose communication with the TACACs server, so locking out all the users.

    Personally I would just turn it back off.

    TACACS (Terminal Access Control Access Control System)
    AAA (Authentication, Authorization and Accounting)
  4. Grinler

    Grinler Malware Specialist

    Mar 10, 2004
    If you did not write the changes to flash, then you should be able to reset the switch to revert back to the previous configuration.

    If you did write, you will have to boot your switch into recovery mode. Instructions on how to do this can be found here:

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