Device Management Issues

Fault Symptom

Failed to log in to an AC through Telnet.

Procedure

1. Check whether a management interface is configured on the AC.

   Error-prone configuration:

   • If no VLANIF interface of a device is configured as a management interface, all VLANIF interfaces can be used to manage the device. After a VLANIF interface is specified as the management interface, you can manage the device only through the specified VLANIF interface but not through other VLANIF interfaces.
   • A maximum of four VLANIF interfaces can be configured as the management interfaces simultaneously.

   <AC> system-view
   [AC] interface vlanif 10
   [AC-Vlanif10] management-interface

   Error-prone configuration: Check whether the configuration is incorrectly performed. If so, run the undo management-interface command to delete the configuration. If not, directly use this interface to manage the device.

2. Check whether the user interface supports Telnet.

   Error-prone configuration: The user interface is not configured to support Telnet.

   <AC> system-view
   [AC] user-interface vty 0 4
   [AC-ui-vty0-4] display this
   #
   user-interface vty 0 4                                                          
    authentication-mode aaa                                                        
    protocol inbound ssh
   #
   return

   Suggestion: Configure the user interface to support Telnet.

   <AC> system-view
   [AC] user-interface vty 0 4
   [AC-ui-vty0-4] authentication-mode aaa
   [AC-ui-vty0-4] protocol inbound all

Fault Symptom

Users cannot log in to the web platform or AC, or the web platform exits unexpectedly after the login.

Procedure

1. Check whether the accounting function is configured on the AC.

   Error-prone configuration: The accounting function is configured but fails, causing unexpected exit of the system.

   <AC> display accounting-scheme default
     Accounting-scheme-name                : default
     Accounting-method                     : RADIUS
     ...

   Suggestion: Delete the configuration of the accounting function.

   <AC> system-view
   [AC] aaa
   [AC-aaa] accounting-scheme default
   [AC-aaa-accounting-default] accounting-mode none

2. Check whether the RADIUS authentication mode is configured in the default authentication profile.

   Error-prone configuration: When no RADIUS authentication server is deployed, the RADIUS authentication mode is configured in the authentication profile. This will cause an authentication failure even if a user enters the correct user name and password.

   <AC> display authentication-scheme default
     Authentication-scheme-name          : default
     Authentication-method               : RADIUS

   Suggestion: Set the authentication mode in the authentication profile to local.

   <AC> system-view
   [AC] aaa
   [AC-aaa] authentication-scheme default
   [AC-aaa-authen-default] authentication-mode local