How to configure 5G-prior access on an AC

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In 5G-prior access mode, if an AP and a STA support both the 5 GHz and 2.4 GHz frequency bands, the AP can request the STA to associate with the 5 GHz radio preferentially.

On the live network, most STAs support both the 5 GHz and 2.4 GHz frequency bands, and a STA usually associates with an AP's 2.4 GHz radio by default when connecting to the Internet. To connect to the 5 GHz radio, you need to manually select the 5 GHz radio. When the 2.4 GHz frequency band has many users or severe interference, the 5 GHz frequency band can provide a better access service for wireless users. The 5G-prior access function enables STAs to preferentially associate with the 5 GHz radio.

5G-prior access is implemented as follows:

When an AP receives a Probe Request frame from a STA, the AP checks the radio receiving the frame. If the Probe Request frame is received by the 2.4 GHz radio, the AP does not send a Probe Response frame. If the Probe Request frame is received by the 5 GHz radio, the AP sends a Probe Response frame immediately. Then the STA associates with the 5 GHz radio.

If only the 2.4 GHz radio receives 25 Probe Request frames continuously but the 5 GHz radio does not receive any Probe Request frame, the AP returns a Probe Response frame on the 2.4 GHz radio. Then the STA associates with the 2.4 GHz radio.

For details about how to configure 5G-prior access on an AC (taking the AC6605 as an example), see:

V200R005:

Configuring 5G-Prior or Normal Access

V200R006:

http://support.huawei.com/ehedex/pages/DOC1000088060DEE1226D/07/DOC1000088060DEE1226D/07/resources/dc/dc_cfg_wlan_rrm_0009.html?ft=0&id=dc_cfg_wlan_rrm_0009]
Configuring Band Steering

Other related questions:
Configure 5G-prior access
Configure 5G-prior access. When an AP and STA support both 5 GHz and 2.4 GHz frequency bands, the AP can request the STA to associate with the 5 GHz radio first. When the AP receives a Probe Request frame from the STA, it checks the radio receiving the Probe Request frame. If the Probe Request frame is received by the 2.4 GHz radio, the AP does not return a Probe Response frame. If the Probe Request frame is received by the 5 GHz radio, the AP returns a Probe Response frame. Then the STA associates with the 5 GHz radio. If only the 2.4 GHz radio receives 25 Probe Request frames continuously but the 5 GHz radio does not receive any, the AP returns a Probe Response frame through the 2.4 GHz radio. Then the STA associates with the 2.4 GHz radio. To implement the 5G-prior access function, an AP must have the same SSID and security policy on the 5 GHz and 2.4 GHz radios. In addition, it is recommended that the power of the 5 GHz radio configured on the AP be greater than that of the 2.4 GHz radio. Configuration: [HUAWEI] wlan [HUAWEI-wlan-view] ap id 0 [HUAWEI-wlan-ap-0] access priority 5g (Run the command on APs in the WLAN view.)

Do APs support 5G-prior access
Single-radio APs do not support 5G-prior access. To support 5G-prior access, APs and STAs must support dual bands. The AP2010DN does not support the 5G-prior access function.

Configuring access interfaces on WLAN devices
The following example describes how to configure an access interface on a WLAN device: An access interface can connect to a user host. [HUAWEI]vlan batch 2 //Create a VLAN. [HUAWEI]interface gigabitethernet0/0/1 [HUAWEI-GigabitEthernet0/0/1]port link-type access //Set the interface type to access. [HUAWEI-GigabitEthernet0/0/1]port default vlan 2 //Add the interface to VLAN 2. [HUAWEI-GigabitEthernet0/0/1]quit

How to configure roaming on an AC
By default, the AC supports intra-AC roaming, which can be implemented as long as the basic WLAN services are configured and the source and destination APs have the same SSID and security policy. To implement inter-AC roaming, you need to configure the master controller, mobility group, and home agent. Note the following points when configuring WLAN roaming: 1. Two APs must use the same SSID and security profile. 2. In the direct forwarding mode, services of a roaming user may be interrupted for a short period because ARP entries of the access device connected to an AP do not age in time. To prevent this problem, run the learn client ip-address enable command in the VAP profile view on the AC to enable STA IP address learning. This function enablesAPs to promptly send gratuitous ARP packets to the access device for ARP entry updates, so that user services will not be interrupted during roaming. By default, STA IP address learning is enabled. 3. A maximum of 16 ACs can be added to a mobility group. An AC can be added only to one mobility group. 4. ACs in the same mobility group must use the same software version, otherwise inter-AC roaming may fail. 5. In dual-link hot standby (HSB) scenarios, roaming between active and standby ACs is not supported. Service interruption may occur if users roam in this scenario.

How do WLAN devices restrict access from low-rate STAs
For details about how to configure an AC to restrict access from low-rate STAs, see: V200R005: Restricting Access from Weak-Signal or Low-Rate STAs V200R006: Configuring Smart Roaming

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