An experience case of AP repeatedly downloading the version and unable to stabilize the online problem
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Network Topology
N/A
Problem Description
An AP in a site repeatedly downloads the version and cannot go online stably
Process Analysis
First of all, let’s clarify the fault phenomenon. From the output information of the AP, we can see that the AP can download the version from the AC and start it normally, and can enter the command line, but it will download the version again after a few seconds.
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********** * * * H3C WA4320i- ACN BootWare, Version 7.07 * * * *************************** *** Copyright (c) 2004-2016 Hangzhou H3C Technologies Co., Ltd Compiled Date: Jun 20 2016 CPU Type: ATHEROS AR9550 CPU L1 Cache: 32KB CPU Clock Speed: 720MHz Memory Type: DDR2 SDRAM Memory Size: 256MB Memory Speed: 560MHz BootWare Size: 512KB Flash Size: 32MB CPLD Version: 006 PCB Version: Ver.C BootWare Validating... Press Ctrl+B to access EXTENDED-BOOTWARE MENU... Loading the main boot and system image files... Loading file flash:/wa4300-system.bin................................. Done . Loading file flash:/wa4300-boot.bin.................................Done. Image file flash:/wa4300-boot.bin is self-decompressing.........................Done. System image is starting... Startup configuration file does not exist. Line con0 is available. Press ENTER to get started. |
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<H3C>%Sep 27 17:25:58:435 2019 H3C SHELL/5/SHELL_LOGIN: Console logged in from con0. <H3C>%Sep 27 17:26:04:649 2019 H3C CWC/6/CWC_IMG_DOWNLOAD_START: Started to download the image file wa4300.ipe through the CAPWAP tunnel to AC 192.168.100.xxx. Decompressing file wa4300-boot.bin to flash:/wa4300-boot.bin................................Done. Decompressing file wa4300-system.bin to flash:/wa4300-system.bin.......................... ................................................... ...................Done. %Sep 27 17:30:30:425 2019 H3C CWC/6/CWC_IMG_DOWNLOAD_COMPLETE: Downloading the image file wa4300.ipe from AC 192.168.100.xxx through the CAPWAP tunnel is complete. %Sep 27 17:30:30:425 2019 H3C CWC/6/CWC_AP_REBOOT: AP in state Image Data is rebooting. Reason: Image was downloaded successfully. %Sep 27 17:30:37:310 2019 H3C DEV/5/SYSTEM_REBOOT: System is rebooting now. System is starting... In the AP command line, we can see that the version of the AP does not match the version of the AC. At the same time, in the debug wlan capwap information of the AC, there is the following print information: *Jul 20 11:24:49:858 2020 vac CWS/7/FSM: Enter Image Download state. *Jul 20 11:24:49:858 2020 vac CWS/7/ERROR: Failed to get image file 0.000000rom the ram path. *Jul 20 11:24:49:858 2020 vac CWS/7/EVENT: Start get ap ipe offset in file /mnt/slot0#flash:/wa4300.ipe *Jul 20 11:24:49:858 2020 vac CWS/7/EVENT: Get the ap ipe offset in file /mnt/slot0#flash:/wa4300.ipe, errCode=0x0 offset=0 ipeSize=0 |
The version of AP is downloaded from the flash of AC, not from apimge. In the list of matching FIT APs in the release manual, it is stated that the ipe file of this type of AP is not packaged in the AC, and the ipe file of the AP needs to be imported separately to the root directory of the AC.
Therefore, it is suspected that the upload of the AP version in the root directory of the AC is incorrect and inconsistent with the version number of the AC. After the AP downloads the version, and due to the version verification mechanism of the AC, the AC will compare the software version of the AP with the model of the AP saved on the AC. Compare the corresponding relationship between software and hardware versions. If the software versions are consistent, the CAPWAP tunnel is allowed to be established; if the software versions are inconsistent, the AP is notified of this situation. After the AP receives the message that the versions are inconsistent, it will request the version from the AC and upgrade the version, and then re-establish a CAPWAP tunnel connection with the AC.
Therefore, the AP will download the version repeatedly and cannot be online stably.
Solution
Re-upload the correct AP ipe file in the AC root directory, and the AP is stable and registered successfully.