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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
AP Fails to Go Online

AP Fails to Go Online

Common Causes

This fault is commonly caused by one of the following:

  • The AP's default IP address conflicts with the IP address of another device on the same LAN.
  • The AP is faulty.
  • The AP does not have an IP address.
  • The network between AP and AC is faulty.
  • The AP fails to be authenticated.
  • The number of APs connected to the AC reaches the upper limit.
  • The parameters such as MAC address and SN on the AP conflict with the parameters on other APs.
  • The versions of AP and AC do not match.
  • The AC does not support this type of AP.
  • The type of AP added offline is different from the actual AP type.

Troubleshooting Flowchart

Figure 27-4 shows the troubleshooting flowchart.
Figure 27-4  Troubleshooting flowchart used when an AP fails to go online

Troubleshooting Procedure

Context

NOTE:

Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel:

Procedure

  1. Check the current AP status.

    Run the display ap command on the device to view the AP status (State field).

    • If the AP status is fault, restart the AP manually. If the AP cannot enter the Normal state after it is restarted, restart the device. If the AP still cannot enter the Normal state, go to step 2.
    • If the AP status is type-not-match, change the AP type to the actual AP type and reset the AP. If the AP is still in Fault state, go to step 2.

  2. Check whether the AP's default IP address conflicts with the IP address of another device on the same LAN.

    NOTE:
    • In WLAN V200R002C00 and earlier versions, the AP's default IP address is 192.168.0.1/24.
    • In WLAN V200R003C00 and later versions, the AP's default IP address is 169.254.1.1/16.

    Use either of the following methods to check whether IP address conflict occurs:

    • Power off the offline AP and run the ping command to check whether the AP's default IP address can be pinged successfully.
      • If so, locate the device with the conflicting IP address and modify the device's IP address. After that, power on the AP. If the AP state cannot become normal, go to step 3.
      • If not, power on the AP and go to step 3.
    • Modify the VLAN to which the offline AP belongs or configure port isolation to isolate the AP from the local LAN. Run the ping command to check whether the AP's default IP address can be pinged successfully.
      • If so, locate the device with the conflicting IP address and modify the device's IP address. After that, delete AP isolation configurations. If the AP state cannot become normal, go to step 3.
      • If not, delete AP isolation configurations and go to step 3.

  3. Check whether the AP is faulty.

    Check whether the power indicators and network cable indicators are normal.

    • If the indicators are abnormal, check whether the power cables and network cables are correctly connected. If the cables are correctly connected, go to step 9.
    • If the indicators are normal, go to step 4.

  4. Check whether the AP has an IP address.

    Run the display ip pool { interface interface-name | name ip-pool-name } used command on the DHCP server to check whether the AP has an IP address.

    • If not, configure a DHCP server when a Layer 2 network exists between AP and AC or configure DHCP Option 43 and DHCP server when a Layer 3 network exists between AP and AC.
    • If so, go to step 5.

  5. Check whether the network between the AP and AC is normal.

    Run the ping command to check whether the device and AP can ping each other.

    • If they cannot ping each other or one end cannot ping another end, modify the VLAN configurations.
    • If they can ping each other, go to step 6.

  6. Check whether the AP is authenticated by the AC.

    Run the display ap-auth-mode command on the device to view the current authentication mode.

    • If the authentication mode is MAC authentication or SN authentication, run the display unauthorized-ap record command to check whether any AP fails to be authenticated. If so, run the ap-confirm { all | { mac ap-mac | sn ap-sn } [ id ap-id ] } command in the WLAN view to add the AP to the whitelist.
    • If the authentication mode is none authentication or the AP has been added to the whitelist, go to step 7.

  7. Check whether the number of APs connected to the AC reaches the upper limit.

    Run the display ap command to check the number of APs in Normal state. If this number exceeds the upper limit, purchase a device of higher performance. If not, go to step 8.

  8. Check whether the MAC address or SN of the AP conflicts with those on another AP.

    Run the display ap command to view the MAC addresses and SNs of APs.

    • If the MAC addresses or SNs conflict, change the settings of the AP.
    • If the MAC addresses or SNs do not conflict, go to step 9.

  9. Check whether the AP version matches the AC version.

    Run the display version command to check the AC version.

    Check the AP version:

    1. Run the display ap-run-info id ap-id command to check AP information.
    2. Log in to the AP from the AC through Telnet.
      NOTE:
      • In WLAN V200R002C00 and earlier versions, the login user name and password are both admin.
      • In WLAN V200R003C00 and later versions, the login user name is admin and the password isadmin@huawei.com.
    3. If the command line Enterprise AP# is displayed, run the show version command to check the AP version.
    4. If the command line ~ # is displayed, type cli, press Enter, and run the show version command to check the AP version.
    5. If the command line <ap-x> is displayed, run the display version command to check the AP version.
    • If the AP version does not match the AC version, replace or upgrade the AP to ensure that the AP version matches the AC version.
    • If the AP version matches the AC version, go to step 10.

  10. Check whether the AC supports this type of AP.

    Run the display ap-type all command to check AP types supported by the AC.

    • If the AC does not support this type of AP, replace the AP with a supported AP.
    • If the AC supports this type of AP, go to step 11.

  11. Check whether the type of the AP added offline is the same as the actual AP type.

    Run the display ap-type all command to check AP types.

    • If the type of the AP added offline is different from the actual AP type, run the undo ap id ap-id command in the WLAN view to delete the AP added offline, and run the ap id ap-id command to add the AP offline again.
    • If the type of the AP added offline is the same as the actual AP type, go to step 12.

  12. Collect the following information and contact technical support personnel:

    • Results of the preceding troubleshooting procedure
    • Configuration file, logs, and alarms of the member switch

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Updated: 2019-05-10

Document ID: EDOC1000079719

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