A large number of devices appear AP and AC How to deal with the version mismatch failure ().

In Huawei WLAN architectures, the Access Controller (AC) and Access Point (AP) communicate via CAPWAP tunnels and must run compatible software versions to establish control channels successfully. When a version mismatch occurs during AP registration, the AC rejects the AP connection or fails to load configuration profiles onto the AP. The standard technical resolution for a version mismatch failure is to upgrade or align the software image of either the AP or AC so that both operating system versions reside within the officially supported compatibility matrix. Once the software versions match, the AP can complete CAPWAP tunnel establishment and successfully join the AC.

B: Replacing functional AP hardware is unnecessary because version mismatches stem from software incompatibility rather than hardware defects. C: Replacing the network switch does not address software image incompatibilities between the AC and AP managed over CAPWAP. D: POE power issues affect hardware powering, not software version negotiation failures between an online AP and AC.

1. Huawei Technologies Co., Ltd., "HCIA-WLAN V3.0 Training Material," Chapter 8: WLAN Troubleshooting, Section 8.2: AP Registration Failures, pp. 312-315, 2021.

2. Huawei Documentation, "AC6605 & AC6005 & AC6003 V200R019C00 Troubleshooting Guide: AP Fails to Go Online Due to Version Mismatch," Document ID: EDOC1100127021, 2020.