Hello, everyone. We'll start to the chapter on troubleshooting WLAN products. The first article we wrote today is about the common AP online failure. AP online failure is a common fault in WLANs. Many users encounter problems during AP online configuration. Then, this article will help you to find out the reasons why the AP fails to go online.
Troubleshooting Approach
Run the display ap all command on the AC to check the AP status.
Check whether the AP has obtained the IP address.
Check whether the AP model and AC version are normal.
Verify that the MAC address or SN of the AP has been added to the AC trustlist.
Check the license status of the AC to check whether there are idle licenses.
Run the display ap online-fail-record command on the AC to check the cause of the AP online failure.
Check the Logbuffer logs of the AC to check whether ARP conflicts exist.
Run the trace command on the AC to check the AP login process.
Check the diag log information. Contact the TAC.
Troubleshooting Procedure
Run the display ap all command on the AC to check the AP status. If the STA cannot find the AP signal, you need to check the AP status on the AC. Check whether only a few APs or a batch of APs fail to go online. By running this command, you can check whether the state is nor. If the state is nor, it indicates that the AP has gone online. If the AP status is other than that, the AP is not online. In this case, locate the fault based on the cause.
Check whether the AP has obtained an IP address: This step is the first step of checking whether the AP has obtained an IP address. You can check whether the AP has obtained an IP address by checking the status of the address pool on the AC or using the console cable to log in to the AP interface and check whether an IP address exists on the AP interface. If an IP address exists, check whether the IP address is within the range of the AC address pool. If the IP address is incorrect, check the IP address first. Cancel the other address pools and perform the test. In addition, the management IP address pool delivered by the AC to the AP must be unique on the LAN. The IP address pool conflicts with the IP address pool of another device. Otherwise, the IP address conflict may occur on the internal network or the AP may incorrectly obtain the IP address.
Check whether the AP model and AC version are normal. The purpose of this step is to check whether the AP works in FAT mode or Fit mode. You can run the display version command to check whether the AP works in FAT mode or Fit mode. If the FAT mode is used, switch to the FIT mode. You can download the software package from the Huawei official website. If the AP is in Fit mode, the AP version must be consistent with that of the AC. For example, if the AC is V200R020, the AP version must be V200R020 or V200R019. You can also query the restrictions on the release notes on the official website. Before configuring APs to go online, you are advised to query the AP version to prevent APs from going online due to version inconsistency.
Check whether the AP MAC address or SN has been added to the AC trustlist. This step is to check whether the AP MAC address or SN is correct. When configuring the AP to go online, you need to add the AP MAC address or SN to the AC. If the MAC address and SN are incorrect or not entered, the AP fails to go online. In this step, you can also run the display ap all command to check whether the MAC address or SN of the AP is correct.
Check the license status of the AC to check whether there are idle licenses. After the preceding steps are complete, you can check the license status of the AC. If some APs fail to go online, check the license status of APs and check whether the APs fail to go online because of lack of license resources. You can run the display license resource usage command to check the license resource usage. If no license resource is available, purchase it first.
Run the display ap online-fail-record command on the AC to check the cause of the AP online failure. If the cause of the AP online failure cannot be found based on the configuration, you can run this command to check the cause of the AP online failure. You can view the cause in Reason. Then, you can check the cause.
Check the log buffer logs of the Agile Controller to check whether ARP conflicts exist. The purpose of this check is to check the logs. If the address pool configured on the Agile Controller conflicts with other devices, Then, you can check the logs to check whether the ARP conflict alarm or other loop alarms exist on the AC.
Run the trace command on the AC to check the AP online process. If the AP still fails to go online after all the preceding steps are checked, you can only trace the AP online process. The trace information shows the AP's steps, such as DHCP packet exchange and AC configuration delivery. The trace command is as follows:
[AC] trace enable
[AC] trace object mac-address dcd2-fc22-xxx
Check the diag log information and contact the TAC center. If the AP fault cannot be identified after all steps are performed, collect diag log information and trace information and contact the TAC center for assistance.
