14-WLAN Configuration Guide (AC)

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13-Band navigation configuration
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Configuring band navigation

About band navigation

Band navigation enables an AP to direct dual-band clients (2.4 GHz and 5 GHz) to the 5 GHz radio whenever possible to avoid congestion in the 2.4 GHz band. This can load balance the radios and improve network performance.

As shown in Figure 1, band navigation is enabled in the WLAN. Client 1 and Client 2 are associated with the 2.4 GHz radio. When the dual-band client Client 3 requests to associate with the 2.4 GHz radio, the AP rejects Client 3 and directs it to the 5 GHz radio.

Figure 1 Band navigation

Restrictions: Hardware compatibility with band navigation

For information about MSR routers that can function as ACs, see "Compatibility of hardware and AC functionality."

Restrictions and guidelines: Band navigation configuration

You can configure APs by using the following methods:

·     Configure APs one by one in AP view.

·     Assign APs to an AP group and configure the AP group in AP group view.

·     Configure all APs in global configuration view.

For an AP, the settings made in these views for the same parameter take effect in descending order of AP view, AP group view, and global configuration view.

Do not enable band navigation in a WLAN where most clients in the WLAN support only the 2.4 GHz band or in a WLAN that is sensitive to traffic delay.

Band navigation tasks at a glance

To configure band navigation, perform the following tasks:

1.     Enabling band navigation globally

2.     Enabling AP-based band navigation

3.     (Optional.) Configuring load balancing for band navigation

4.     (Optional.) Configuring band navigation parameters

¡     Setting the maximum number of denials for 5 GHz association requests

¡     Setting the band navigation RSSI threshold

¡     Setting the client information aging time

Prerequisites for band navigation

Complete the following tasks before configuring band navigation:

·     Disable quick association. For more information about quick association, see "Configuring WLAN access."

·     Enable both the 5 GHz and 2.4 GHz radios and bind the radios to the same service template.

Enabling band navigation globally

1.     Enter system view.

system-view

2.     Enable band navigation globally.

wlan band-navigation enable

By default, band navigation is disabled globally.

Enabling AP-based band navigation

Restrictions and guidelines

Band navigation takes effect on an AP only when you enable band navigation both globally and for the AP.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or AP group view.

¡     Enter AP view.

wlan ap ap-name

¡     Enter AP group view.

wlan ap-group group-name

3.     Enable band navigation for the AP.

band-navigation enable

By default:

¡     In AP view, an AP uses the configuration in AP group view.

¡     In AP group view, band navigation is enabled.

Configuring load balancing for band navigation

About this task

An AP rejects the 5 GHz association request of a client when the following conditions are met:

·     The number of clients on the 5 GHz radio reaches the specified threshold.

·     The client number gap between the 5 GHz radio and the radio that has the fewest clients reaches the specified threshold.

Procedure

1.     Enter system view.

system-view

2.     Configure load balancing for band navigation.

wlan band-navigation balance session session [ gap gap ]

By default, load balancing is disabled for band navigation.

Configuring band navigation parameters

Setting the maximum number of denials for 5 GHz association requests

About this task

If the number of times that a 5 GHz radio rejects a client reaches the specified maximum number, the radio accepts the association request of the client.

Procedure

1.     Enter system view.

system-view

2.     Set the maximum number of denials for 5 GHz association requests.

wlan band-navigation balance access-denial access-denial

By default, the maximum number of denials is 1 for 5 GHz association requests.

Setting the band navigation RSSI threshold

About this task

A client might be detected by multiple radios. A 5 GHz radio rejects the association request of a client if the client's RSSI is lower than the band navigation RSSI threshold.

Procedure

1.     Enter system view.

system-view

2.     Set the band navigation RSSI threshold.

wlan band-navigation rssi-threshold rssi-threshold

By default, the band navigation RSSI threshold is 15.

Setting the client information aging time

About this task

When an AP receives an association request from a client, the AP records the client's information and starts the client information aging timer. If the AP does not receive any probe requests or association requests from the client before the aging timer expires, the AP deletes the client's information.

Configure an appropriate client information aging time to ensure both client association and system resource efficiency.

Procedure

1.     Enter system view.

system-view

2.     Set the client information aging time.

wlan band-navigation aging-time aging-time

By default, the client information aging time is 180 seconds.

Band navigation configuration examples

Example: Configuring band navigation

Network configuration

As shown in Figure 2, both the 5 GHz radio and the 2.4 GHz radio are enabled on the AP. Configure band navigation and load balancing for band navigation to load balance the radios.

Figure 2 Network diagram

Procedure

# Create service template 1 and set its SSID to band-navigation.

<AC> system-view

[AC] wlan service-template 1

[AC-wlan-st-1] ssid band-navigation

[AC-wlan-st-1] service-template enable

[AC-wlan-st-1] quit

# Create AP template ap1, and specify the model and serial ID.

[AC] wlan ap ap1 model WA4320i-ACN

[AC-wlan-ap-ap1] serial-id 210235A29G007C000020

# Enter radio view of radio 1, and configure radio 1 to operate in 802.11n (5 GHz) mode.

[AC-wlan-ap-ap1] radio 1

[AC-wlan-ap-ap1-radio-1] type dot11an

# Bind service template 1 to radio 1 of AP 1, and enable radio 1.

[AC-wlan-ap-ap1-radio-1] service-template 1

[AC-wlan-ap-ap1-radio-1] radio enable

[AC-wlan-ap-ap1-radio-1] quit

# Enter radio view of radio 2, and configure radio 2 to operate in 802.11n (2.4 GHz) mode.

[AC-wlan-ap-ap1] radio 2

[AC-wlan-ap-ap1-radio-2] type dot11gn

# Bind service template 1 to radio 2 of AP 1, and enable radio 2.

[AC-wlan-ap-ap1-radio-2] service-template 1

[AC-wlan-ap-ap1-radio-2] radio enable

[AC-wlan-ap-ap1-radio-2] quit

[AC-wlan-ap-ap1] quit

# Enable band navigation globally.

[AC] wlan band-navigation enable

# Enable band navigation for AP 1.

[AC] wlan ap ap1 model WA4320i-ACN

[AC-wlan-ap-ap1] band-navigation enable

[AC-wlan-ap-ap1] quit

# Enable load balancing for band navigation, and set the client number threshold and client number gap threshold to 5 and 2, respectively.

[AC] wlan band-navigation balance session 5 gap 2

# Set the maximum number of denials for 5 GHz association requests to 3.

[AC] wlan band-navigation balance access-denial 3

# Set the band navigation RSSI threshold to 30.

[AC] wlan band-navigation rssi-threshold 30

# Set the client information aging time to 160 seconds.

[AC] wlan band-navigation aging-time 160

Verifying the configuration

1.     Verify that a dual-band client is associated with the 5 GHz radio when it requests to associate with the AP. (Details not shown.)

2.     Verify that a dual-band client is associated with the 2.4 GHz radio when the following conditions are met:

¡     The number of clients on the 5 GHz radio reaches 5.

¡     The client number gap between the 5 GHz radio and the 2.4 GHz radio reaches 2. (Details not shown.)