Configuring Agile Distributed SFN Roaming

Context

In the agile distributed Wi-Fi networking, some scenarios require high network connection stability, such as healthcare scenarios. In this case, you can run the sfn-roam enable command to enable agile distributed SFN roaming. All RUs are deployed to work on the same channel and use the same BSSID for communicating with STAs. When the STAs move within the signal coverage of the same SSID, they are not aware of roaming and services are not interrupted.

Pre-configuration Tasks

Before configuring agile distributed SFN roaming, complete the following tasks:

Configure the central AP and RUs to go online.
Configure STAs to go online.
Configure all RUs to work on the same channel. For details, see Configuring Basic Radio Parameters.

Procedure

Run system-view
The system view is displayed.
Run wlan
The WLAN view is displayed.
Run vap-profile name profile-name
The VAP profile view is displayed.

By default, the system provides the VAP profile default.
Run sfn-roam enable
Agile distributed SFN roaming is enabled.

By default, agile distributed SFN roaming is disabled.
Bind the VAP profile to an AP group. For details, see Binding VAP Profiles.
Run quit
Return to the WLAN view.
(Optional) Configure agile distributed SFN roaming parameters.
1. Run the rrm-profile name profile-name command to create an RRM profile and enter the RRM profile view.
  By default, the system provides the RRM profile default.
2. Configure agile distributed SFN roaming decision parameters.
  - Run the sfn-roam roam-check check-interval check-interval-value command to set the decision period for agile distributed SFN roaming.
    
    The default decision period for agile distributed SFN roaming is 700 milliseconds.
  - Run the sfn-roam report-interval report-interval-value command to set the interval for RUs to report STA RSSIs.
    
    By default, RUs report STA RSSIs to the central AP at an interval of 400 milliseconds.
  - Run the sfn-roam roam-check sta-holding times sta-holding-times command to set the number of STA holding times for agile distributed SFN roaming.
    
    By default, the number of STA holding times for agile distributed SFN roaming is 3.
  - Configure parameters that affect criteria for determining the cumulative RSSI change value of STAs.
    - Run the sfn-roam roam-check rssi-accumulate threshold rssi-accumulate-value command to set the cumulative RSSI change threshold for agile distributed SFN roaming.
      
      By default, the cumulative RSSI change threshold of agile distributed SFN roaming STAs is 8 dB.
  - Configure parameters that affect criteria for determining the RSSI gap.
    - Run the sfn-roam roam-check gap-rssi gap-rssi command to set the RSSI gap for agile distributed SFN roaming RUs.
      
      The default RSSI gap for agile distributed SFN roaming RUs is 6 dB.
  - Configure parameters that affect criteria for determining the higher RSSI of agile distributed roaming RUs than that of the local RU.
    - Run the sfn-roam roam-check better-times better-times command to set the number of times the RSSI of agile distributed SFN roaming RUs is higher than that of the local RU.
      
      By default, the number of times the RSSI of agile distributed SFN roaming RUs is higher than that of the local RU is 2.
    - Run the sfn-roam roam-check high-threshold high-threshold-value command to set the upper RSSI threshold for agile distributed SFN roaming.
      
      By default, the upper RSSI threshold for agile distributed SFN roaming is -55 dBm.
    - Run the sfn-roam roam-check low-threshold low-threshold-value command to set the lower RSSI threshold for agile distributed SFN roaming.
      
      By default, the lower RSSI threshold for agile distributed SFN roaming is -60 dBm.
3. Run the quit command to return to the WLAN view.
4. Enter the AP group radio view.
  1. Run the ap-group name group-name command to enter the AP group view.
  2. Run the radio radio-id command to enter the radio view.
5. Configure radio parameters related to agile distributed SFN roaming.
  - Run the cts disable command to disable RUs from responding to STAs with CTS packets.
    
    By default, RUs are enabled to respond to STAs with CTS packets.
  - Run the cts delay delay-time command to set a delay for RUs to respond to STAs with CTS packets.
    
    By default, RUs respond to STAs with CTS packets with no delay.
  - Run the beacon disable command to disable RUs from sending Beacon frames.
    
    By default, RUs are enabled to send Beacon frames.
6. Run the quit command to return to the AP group view.
7. Run the quit command to return to the WLAN view.
8. Run the radio-2g-profile name profile-name or radio-5g-profile name profile-name command to enter the 2G or 5G radio profile view.
9. Run the rrm-profile profile-name command to bind the RRM profile to the 2G or 5G radio profile.
10. Run the quit command to return to the WLAN view.
11. Bind the radio profile to an AP group. For details, see Binding a Radio Profile.

Verifying the Configuration

Run the display vap-profile { all | name profile-name } command to check the agile distributed SFN roaming state in the VAP profile.
Run the display rrm-profile { all | name profile-name } command to check agile distributed SFN roaming parameters in the RRM profile.