Licensing Requirements and Limitations for Roaming

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

Client

To implement the fast roaming feature, the client must support fast roaming technology.

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.

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

The APs on which WLAN roaming is implemented must use the same SSID and security profiles, and the security profiles must have the same configurations.
In direct forwarding mode, if the ARP entry of a user is not aged out in time on the access device connected to the AP after the user roams, services of the user will be temporarily interrupted. You are advised to enable STA address learning on the AC. After the function is enabled, the AP will send a gratuitous ARP packet to the access device so that the access device can update ARP entries in a timely manner. This ensures nonstop service transmission during user roaming.
You can use either of the following methods to enable STA address learning according to the version of your product:
- Run the learn client ip-address enable command in the service set view.
IEEE 802.11r supports open system, WPA2-PSK, and 802.1X authentication.
The 802.11r fast roaming and Protected Management Frame (PMF) functions are mutually exclusive. If the 802.11r fast roaming function has been configured, the PMF function cannot be configured.
STAs that are not compatible with 802.11r cannot associate with WLANs on which the 802.11 fast roaming function is enabled. To guarantee normal network services for users, replace the earlier STA model with the one that supports 802.11r, or create two VAPs using the same SSID with one enabling 802.11r and the other disabling it, and retain other configurations.
When 802.1X authentication is used for 802.11r, some STAs may get offline and online again during reauthentication due to compatibility issues if 802.1X reauthentication is enabled.
When configuring inter-AP roaming between different service VLANs, ensure that the gateway for these service VLANs is located on the same device.
Pay attention to the following precautions when configuring agile distributed SFN roaming:
- Network planning precautions:
  - Agile distributed SFN roaming is supported only by the AD9430DN-12 (including matching RUs) and AD9430DN-24 (including matching RUs). RUs support agile distributed SFN roaming in the following combination modes:
    - Between the R230D and R240D (Note: Only the 2.4 GHz radio of the R230D and R240D supports agile distributed SFN roaming, and the 5 GHz radio does not support.)
    - Among the R250D, R250D-E, R251D, R251D-E, and R450D
  - For the central AP, after agile distributed SFN roaming is enabled, the total number of agile distributed SFN roaming STAs on a single frequency band (2.4 GHz or 5 GHz) of all RUs does not exceed 128, and that of STAs associated with other VAPs on the same band does not exceed 128.
  - After agile distributed SFN roaming is enabled, configure all RUs to work on the same channel. When agile distributed SFN roaming is enabled on the 5 GHz frequency band, configure non-radar channels.
  - RUs involved in roaming must be associated with the same central AP but do not support agile distributed SFN roaming between central APs.
  - Inter-RU roaming is Layer 2 roaming within a central AP. Agile distributed SFN roaming is not performed on Layer 3.
- Configuration precautions:
  - When agile distributed SFN roaming is enabled for both the 2.4 GHz and 5 GHz radios, it is recommended that different SSIDs be used. Otherwise, the radio switchover may occur, affecting user experience.
  - Agile distributed SFN roaming can be enabled only on one VAP of a radio. If multiple VAPs are configured on a radio, it is recommended that the total VAP rate limit on all VAPs with agile distributed SFN roaming disabled be set to 5 Mbit/s.
    
    If agile distributed SFN roaming is enabled on a VAP of a radio in an AP group, the roaming tracks of all the STAs that are connected to the central AP and associated with the radio may carry the s flag.
  - Radios enabled with agile distributed SFN roaming do not support channel scanning, channel calibration, or smart roaming.
  - Agile distributed SFN roaming can be configured based only on AP groups but not based on APs.
  - RUs involved in agile distributed SFN roaming need to have the following items configured the same:
    - SSID
    - VAP profile and VAP ID
    - Security policy. Agile distributed SFN roaming supports these encryption modes: WPA+PSK, WPA2+PSK, WPA-WPA2+PSK, WPA+802.1X (EAP authentication), WPA2+802.1X (EAP authentication), WPA-WPA2+802.1X (EAP authentication), and Portal+PSK.
Pay attention to the following points when configuring inter-AC roaming:
- Inter-AC roaming is supported only in distributed VXLAN gateway scenarios, and only Layer 2 inter-AC roaming is supported.
- ACs in the same mobility group must run the same system software of the C version. Otherwise, inter-AC roaming may fail.
- The mobility group name and IP address for establishing an inter-AC tunnel must be configured on each AC in the mobility group. ACs must be added to the mobility group.
- The IP addresses used for establishing an inter-AC tunnel between ACs in a mobility group must be the CAPWAP source IP addresses of the ACs. When multiple CAPWAP source IP addresses are configured, only on CAPWAP source IP address can be used to establish an inter-AC tunnel.
- The mobility group name must be the same on each AC.
- A maximum of 16 ACs can be added to a mobility group, and one AC can be added only to one mobility group.
- Roaming cannot be performed between WLAN ACs and switches.
The 802.11r fast roaming function is not available for the AirEngine 8760-X1-PRO, AirEngine 8760R-X1, AirEngine 8760R-X1E, AirEngine 6760-X1, AirEngine 6760-X1E, AirEngine 6760R-51, AirEngine 6760R-51E, AirEngine 5760-51, AirEngine 5760-22W, and AirEngine 5760-22WD.