The RUs and central AP reside on the same Layer 2 network on an agile distributed WLAN. The default PVID of the central AP's downlink interfaces is the management VLAN ID and cannot be changed. That is, the central AP's downlink interfaces join the management VLAN (mVLAN) by default and cannot be removed from the mVLAN, but they can be added to other VLANs. The working mode of the interfaces must be set to middle.
RUs can go online only after the central AP reports RU information to the AC. Therefore, the central AP must go online first.
- Each RU can only discover one central AP. After the central AP and RUs go online, the AC delivers configurations to the central AP, and the central AP delivers configurations to its connected RUs.
For details, see the AC6605&AC6005&ACU2(AC&FITAP) Product Documentation.
Step 1 Log in to the enterprise technical support website at http://support.huawei.com/enterprise.
Step 2 Click WLAN.
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Step 3 Click the name of the product to be queried, for example, AC6605.
Step 4 Choose Product Documentation Sets > Product Documentation to find the AC6605&AC6005&ACU2(AC&FITAP) Product Documentation for your AC software version.
Step 5 Open the AC6605&AC6005&ACU2(AC&FITAP) Product Documentation. Choose Configuration > CLI-based Configuration > WLAN Service Configuration Guide > Configuring APs to Go Online/Configuring the Central AP and RUs to Go Online in the navigation tree on the left, and follow the instructions.
![[From Beginner to Expert] Q&A: How Do I Configure APs to Go Online-2661103-2](http://forum.huawei.com/enterprise/en/data/attachment/forum/201805/08/113937kdz456t9zcxtchrz.png)
AC6605&AC6005&ACU2(AC&FITAP) Product Documentation