Licensing Requirements and Limitations for Dual-Link Cold Backup

Involved Network Elements

APs mentioned in this document are Huawei AP products. You are advised to use Huawei APs to connect to the AC.
You can run the display ap-type all command to check the default AP types supported by the device.
When central APs and RUs are used, ensure that their versions are the same. For example, if the central AP version is V200R007C10, the RU version must be V200R007C10.

**Table 1** Mapping between switch versions and AP versions
Product Software Version	AP Software Version
V200R019C10	V200R019C10 V200R019C00 V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R019C00	V200R019C00 V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R013C00	V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R012C00	V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R011C10	V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R011C00	V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R010C00	V200R007C10 V200R006C20 V200R006C10
V200R009C00	V200R006C20 V200R006C10
V200R008C00	V200R005C30 V200R005C20 V200R005C10
V200R007	V200R005C20 V200R005C10
V200R006	V200R005C00

Licensing Requirements

When the device is used as a WLAN AC, the number of online APs supported by the device is controlled by licenses. The device supports a maximum of 16 online APs. To increase the number of online APs supported by the device, apply for and purchase a license from the agent.

AP resource license-1AP for WLAN access controller
AP resource license-16AP for WLAN access controller
AP resource license-32AP for WLAN access controller
AP resource license-64AP for WLAN access controller
AP resource license-128AP for WLAN access controller
AP resource license-512AP for WLAN access controller

For details about how to apply for a license, see Obtaining Licenses in the S1720, S5700, and S6700 Series Switches License Usage Guide.

In dual-link cold backup scenarios, apply for licenses for both the active and standby ACs and load the licenses.

Switches support centralized license control from V200R013. When this function is enabled, you do not need to apply for licenses for the active and standby ACs.

Feature Support in V200R019C10

This feature is supported only by the following models: S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720-HI, S6730S-H, and S6730-H.

Feature Limitations

WLAN service configurations (for example, WMM profile, radio profile, radio, traffic profile, security profile, and security policies) of the same AP must be consistent on the active and standby ACs; otherwise, the AP cannot work properly after an active/standby AC switchover.
The active and standby ACs can be of different models, and their software versions need to match AP versions. ACs based on switches cannot work in dual-link cold backup mode with independent WLAN AC series. For example, dual-link cold backup cannot be configured between the S5720-HI and the ACU2 or AC6605.
N+1 backup cannot be configured concurrently with dual-link backup.
When an active/standby switchover is implemented between two ACs, STAs using open system authentication remain connected to APs while STAs using other authentication modes are disconnected and need to go online again.