Case Study: APs Fail to Go Online Because the AP Upgrade Is Configured on the AC but the Upgrade File Does Not Exist

Symptom

The AP upgrade is configured on the native AC of the S7700, but the upgrade file does not exist. As a result, APs fail to go online.

Relevant Alarms and Logs

None

Cause Analysis

An AP version file that does not exist in the SD card is specified when the ap update update-filename command is run on the S7700. As a result, the AP version fails to be updated when the APs attempt to go online.

Procedure

1. Run the display ap all command to check whether the APs are online and the network segments where the APs reside.

   The command output shows that only several new APs fail to go online.

2. Check whether the new AP can obtain an IP address and whether the connectivity between the AP and source IP address of the AC is normal.
   1. Check the CAPWAP source interface configuration.

   2. Check the IP address of the CAPWAP source interface.

   3. Check the IP addresses of offline APs.

   The command output shows that the offline APs have obtained IP addresses that reside on the same network segment as the CAPWAP source IP address, and the connectivity is normal.

3. Check the reason why the APs fail to go online.

   The preceding command output shows that the APs fail to go online due to a DTLS negotiation failure or version update failure.

4. Use the trace function to check the AP online process.

   [s7706] trace object mac-address qqqq-qqqq-qqqq
   [s7706] trace enable

   The preceding command output indicates that the APs fail to go online maybe because the version file fails to be updated.

   Disable the trace function.

   [s7706] undo trace object all
   [s7706] undo trace enable

5. Check the AP upgrade configuration.

   # Display the AP upgrade configuration.

   # Display AP upgrade files on the device.

   The preceding command output shows that the AP upgrade file specified by the ap update update-file-name configuration on the S7706 does not exist in the SD card.

6. After the ap update update-filename ap-type 75 configuration is deleted, the APs go online successfully.