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Configuration Guide - WLAN-AC

S5700 and S6720 V200R012C00

This document describes the configurations of WLAN, including WLAN Service Configuration, Radio Resource Management, Roaming, WLAN QoS, WLAN Security, WDS, Mesh, Location, Hotspot 2.0, Dual-Link Cold Backup, N+1 Backup.
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Example for Configuring Smart Roaming

Example for Configuring Smart Roaming

Configuration Process

You need to configure and maintain WLAN features and functions in different profiles. These WLAN profiles include regulatory domain profile, radio profile, VAP profile, AP system profile, AP wired port profile, WIDS profile, WDS profile, and Mesh profile. When configuring WLAN services, you need to set related parameters in the WLAN profiles and bind the profiles to the AP group or APs. Then the configuration is delivered to and takes effect on the APs. WLAN profiles can reference one another; therefore, you need to know the relationships among the profiles before configuring them. For details about the profile relationships and their basic configuration procedure, see WLAN Service Configuration Procedure.

Networking Requirements

Usually, a large number of APs are deployed on the stadium stand. The APs in Figure 6-15 connect to the AC through Switch_A to provide wireless services for users.

To ensure optimal user experience, the IT Dept of the stadium requires that users associate with the nearest APs when moving on the stadium stand.

Figure 6-15  Networking diagram for configuring smart roaming

Data Planning

Table 6-9  AC data planning



RRM profile
  • Name: wlan-rrm

  • Smart roaming threshold type: SNR-based
  • SNR threshold for smart roaming: 15
2G radio profile
  • Name: wlan-radio2g

  • Referenced profile: RRM profile wlan-rrm

5G radio profile
  • Name: wlan-radio5g

  • Referenced profile: RRM profile wlan-rrm

Configuration Roadmap

Configure smart roaming and proper smart roaming parameters to forcibly disconnect weak-signal users (especially sticky terminals) so that the users can reconnect or roam to APs with strong signals.


Some terminals on live networks have low roaming aggressiveness. As a result, they stick to the initially connected APs regardless of whether they move far from the APs, and have weak signals or low rates. The terminals fail to roam to neighbor APs with better signals. They are called sticky terminals.

Configuration Notes

  • No ACK mechanism is provided for multicast packet transmission on air interfaces. In addition, wireless links are unstable. To ensure stable transmission of multicast packets, they are usually sent at low rates. If a large number of such multicast packets are sent from the network side, the air interfaces may be congested. You are advised to configure multicast packet suppression to reduce impact of a large number of low-rate multicast packets on the wireless network. Exercise caution when configuring the rate limit; otherwise, the multicast services may be affected.
    • In direct forwarding mode, you are advised to configure multicast packet suppression on switch interfaces connected to APs.
    • In tunnel forwarding mode, you are advised to configure multicast packet suppression in traffic profiles of the AC.
    For details on how to configure traffic suppression, see "How Do I Configure Multicast Packet Suppression to Reduce Impact of a Large Number of Low-Rate Multicast Packets on the Wireless Network?" in WLAN QoS Configuration of the Configuration Guide - WLAN-AC of the corresponding product version.
  • Configure port isolation on the interfaces of the device directly connected to APs. If port isolation is not configured and direct forwarding is used, a large number of unnecessary broadcast packets may be generated in the VLAN, blocking the network and degrading user experience.

  • In tunnel forwarding mode, the management VLAN and service VLAN cannot be the same. Only packets from the management VLAN are transmitted between the AC and APs. Packets from the service VLAN are not allowed between the AC and APs.


  1. Set the NAC mode to unified on the AC so that users can connect to the network properly.

    <HUAWEI> system-view
    [HUAWEI] authentication unified-mode

    If the NAC mode is changed from traditional to unified, the unified mode takes effect after you save the configuration and restart the device.

  2. Check the basic configuration of the WLAN.

    Check Item



    Check the AP group to which an AP belongs.

    display ap all

    AP group: ap-group1

    Check all profiles referenced by the AP group.

    display ap-group name ap-group1

    VAP profile: wlan-net

    Check all profiles referenced by the VAP profile.

    display vap-profile name wlan-net

    SSID profile: wlan-net

  3. Configure smart roaming.

    # Create the RRM profile wlan-rrm, enable smart roaming in the RRM profile, configure SNR-based roaming trigger mode and roaming threshold to 15 dB.

    <HUAWEI> system-view
    [HUAWEI] sysname AC
    [AC] wlan
    [AC-wlan-view] rrm-profile name wlan-rrm
    [AC-wlan-rrm-prof-wlan-rrm] undo smart-roam disable 
    [AC-wlan-rrm-prof-wlan-rrm] smart-roam roam-threshold check-snr
    [AC-wlan-rrm-prof-wlan-rrm] smart-roam roam-threshold snr 15
    [AC-wlan-rrm-prof-wlan-rrm] quit

    # Create the 2G radio profile wlan-radio2g and bind the RRM profile wlan-rrm to the 2G radio profile.

    [AC-wlan-view] radio-2g-profile name wlan-radio2g 
    [AC-wlan-radio-2g-prof-wlan-radio2g] rrm-profile wlan-rrm
    [AC-wlan-radio-2g-prof-wlan-radio2g] quit

    # Create the 5G radio profile wlan-radio5g and bind the RRM profile wlan-rrm to the 5G radio profile.

    [AC-wlan-view] radio-5g-profile name wlan-radio5g 
    [AC-wlan-radio-5g-prof-wlan-radio5g] rrm-profile wlan-rrm
    [AC-wlan-radio-5g-prof-wlan-radio5g] quit

    # Bind the 5G radio profile wlan-radio5g and 2G radio profile wlan-radio2g to the AP group ap-group1.

    [AC-wlan-view] ap-group name ap-group1 
    [AC-wlan-ap-group-ap-group1] radio-5g-profile wlan-radio5g radio 1
    [AC-wlan-ap-group-ap-group1] radio-2g-profile wlan-radio2g radio 0
    [AC-wlan-ap-group-ap-group1] quit

  4. Verify the configuration.

    # Run the display rrm-profile name wlan-rrm command on the AC to check the smart roaming configuration.

    [AC-wlan-view] display rrm-profile name wlan-rrm
    Smart-roam                                             : enable
    Smart-roam check SNR                                   : enable
    Smart-roam standing SNR threshold(dB)                  : 15
    Smart-roam SNR quick-kickoff-threshold(dB)             : 0
    Smart-roam check rate                                  : disable
    Smart-roam rate threshold(%)                           : 20
    Smart-roam rate quick-kickoff-threshold(%)             : 0
    Smart-roam high level SNR margin(dB)                   : 15
    Smart-roam low level SNR margin(dB)                    : 6
    Smart-roam SNR check interval(s)                       : 3
    Smart-roam unable roam client expire time(m)           : 120

    # When a large number of users in the stadium access the WLAN, they can still enjoy good Internet experience.

Configuration Files

  • AC configuration file

     sysname AC
     rrm-profile name wlan-rrm
      smart-roam roam-threshold check-snr
      smart-roam roam-threshold snr 15
     radio-2g-profile name radio2g
      rrm-profile wlan-rrm
     radio-5g-profile name radio5g
      rrm-profile wlan-rrm
     ap-group name ap-group1
      radio 0
       radio-2g-profile wlan-radio2g
       vap-profile wlan-net wlan 1
      radio 1
       radio-5g-profile wlan-radio5g
       vap-profile wlan-net wlan 1
Updated: 2018-12-24

Document ID: EDOC1100038361

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