Friday, July 31, 2009

I cant configure my Cisco 1900 Switch. Console just loops?

When I access the console I get :





Catalyst 1900 Management Console


Copyright (c) Cisco Systems, Inc. 1993-1999


All rights reserved.


Enterprise Edition Software


Ethernet Address: 00-90-2B-54-EC-00





PCA Number: 73-2239-04


PCA Serial Number: FAA02173373


Model Number: WS-C1924-A


System Serial Number: FAA0218W0SG


--------------------------------------...





1 user(s) now active on Management Console.





User Interface Menu





[M] Menus


[K] Command Line





Enter Selection:





When i choose M...





This option cannot be used when TACACS+ is in enabled.





Press any key to continue.





then back to main menu


Then K gives me....








Authentication using TACACS+ is in progress.





Timed out waiting for response from server.





Press any key to continue.





What can I do?

I cant configure my Cisco 1900 Switch. Console just loops?
Well, your console access is fine, it's your AAA which is not working. Is this a production switch, or a switch in a lab? If you can reboot it, you should just do a PW recovery on it and wipe it clean:


http://www.cisco.com/en/US/products/hw/s...





If this is a production box and you need that configuration, you will need to figure out what is wrong with the AAA. I can think of a few ways to do this, but perhaps the easiest - assuming you have SNMP R/W to the box - is to grab the config via SNMP and review it, then take out the offending line(s). Alternatively you could check the logs on the ACS box (or if you are not using ACS, logs on whatever box you are using) to see WHY it is failing (authentication or authorization).





Since you are getting a timeout from the attempt my GUESS is that this switch was configured for TACACS before, and now the server is gone, and no secondary auth method exists, which is why I recommend the SNMP option if it is already in production ... password recovery if not.





Hope this helps!
Reply:Considering that this is Cisco, have you attempted to do a wipe of the switch, restore it back to system defaults and tried to telnet in and set it back up? I'm not quite familiar with the 1900 series switch but I am familiar with the 1100, 1200, series APs and the console looping has been fixed with a simple wipe.

love song

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