[Knowledge sharing]How to locate faults of DHCP, AAA, or NAC service during user access ?

When locating faults of DHCP, AAA, or NAC service during user access, you can create diagnosis objects to trace services and locate the faults. The full-process tracing function traces and displays the packet interaction process between a traced object and an AC or AP based on the information about the object 

Example: 

1. Collect trace information, such as a user's MAC address 58-1f-28-fc-fc-fc, the MAC of a test station

   <AC> system-view[AC] trace object mac-address 58-1f-28-fc-fc-fc[AC] trace enable
   

2. Delete all traced objects after collecting the trace information.

   [AC] undo trace object all[AC] undo trace enable
   

The following parameters can be used when you want to locate the faults: 

DHCP service: based on the MAC address.

AAA and NAC services: based on the MAC address, IP address, user name, user VLAN ID, access mode, or interface number.

Tip:
1)To ensure that you can diagnose the entire DHCP service process, create a diagnosis object based on the MAC address. 

2)You can use this command also to cover the AP online process to check in which step the fault occurs on the AP, and locate the fault.

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