08-Radio Resources Management

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08-WLAN radio load balancing configuration
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Configuring WLAN radio load balancing

About WLAN radio load balancing

WLAN radio load balancing dynamically balances clients across radios on APs managed by the same AC. It ensures wireless service quality and adequate bandwidth for clients in high-density WLANs.

Networking scheme

As shown in Figure 1, AP 1 and AP 2 are managed by the same AC and they each have Radio 1 and Radio 2 enabled. Radio load balancing is enabled in the WLAN. Radio 1 and Radio 2 of AP 1 have reached their maximum load. When Client 6 tries to associate with a radio on AP 1, the AC rejects the association request and directs Client 6 to other radios.

Figure 1 Network diagram

Radio load balancing modes and types

The device supports session-mode radio load balancing and the following radio load balancing types:

·     Session gap threshold based—The device performs radio load balancing when the following conditions are met:

¡     The number of clients associated with a radio reaches the session threshold.

¡     The session gap between the radio and the radio that has the fewest clients reaches the session gap threshold.

The session gap is the difference between weighted client value of a radio where the client comes online and the weighted client value of the radio that has the fewest clients within the same AC. The weighted client value is equivalent to the number of clients multiplied by the radio weight value. The radio weight values of 2.4 GHz and 5 GHz radios are 2 and 1, respectively.

·     Band ratio based—The device performs radio load balancing in the following scenarios:

Scenario 1

¡     A client requests to associate with a 5 GHz radio.

¡     The number of clients associated with the 5 GHz radio reaches the session threshold.

¡     The ratio of clients associated with all 5 GHz neighbor radios to clients associated with all 2.4 GHz neighbor radios of the client is larger than the band ratio.

Scenario 2

¡     A client requests to associate with a 2.4 GHz radio.

¡     The number of clients associated with the 2.4 GHz radio reaches the session threshold.

¡     The ratio of clients associated with all 5 GHz neighbor radios to clients associated with all 2.4 GHz neighbor radios of the client is smaller than the band ratio.

 

 

NOTE:

Neighbor radios of a client refer to all radios that receive requests from the client.

Restrictions and guidelines: WLAN radio load balancing configuration

When a client requests to access the WLAN, the system performs radio load balancing only among radios of APs managed by the same AC and can be detected by the client.

WLAN radio load balancing and WLAN load balancing or band navigation are mutually exclusive. For more information about WLAN load balancing and band navigation, see "Configuring WLAN load balancing" and "Configuring band navigation" in Radio Resources Management Configuration Guide.

WLAN radio load balancing tasks at a glance

To configure WLAN radio load balancing, perform the following tasks:

·     (Required.) Enabling WLAN radio load balancing

·     (Optional.) Configuring radio load balancing parameters

·     (Optional.) Configuring overloaded 5 GHz radios to hide SSIDs

Prerequisites for WLAN radio load balancing

Before you configure radio load balancing, make sure the quick association function is disabled. For more information about quick association, see "Enabling quick association" in WLAN Access Configuration Guide.

Enabling WLAN radio load balancing

1.     Enter system view.

system-view

2.     Enable WLAN radio load balancing.

wlan radio-load-balance enable [ mode session value [ gap gap-value | band-ratio 5g-proportion 2.4g-proportion ] [ report-time time ] ]

By default, WLAN radio load balancing is disabled.

Configuring radio load balancing parameters

About this task

The following parameters affect radio load balancing calculation:

·     Radio load balancing RSSI threshold—If a radio detects that the RSSI of a client is lower than the specified RSSI threshold, the radio ignores the association requests of the client.

·     Maximum number of denials for association requests—If the number of times that a radio rejects a client reaches the specified maximum number of denials for association requests, the radio accepts the association request of the client.

Procedure

1.     Enter system view.

system-view

2.     Set the RSSI threshold.

wlan radio-load-balance rssi-threshold rssi-threshold

By default, the RSSI threshold is 30.

3.     Set the maximum number of denials for association requests.

wlan radio-load-balance access-denial access-denial

By default, the maximum number of denials is three for association requests.

Configuring overloaded 5 GHz radios to hide SSIDs

About this task

With this feature enabled, a 5 GHz radio hides its SSID in beacon frames when the following conditions are met:

·     The number of clients associated with the 5 GHz radio reaches the session threshold.

·     The session gap between the 5 GHz radio and another 5 GHz radio on the same AP reaches the session gap threshold.

The 5 GHz radio stops hiding its SSID in beacon frame when either of the following conditions are met:

·     The number of clients associated with the 5 GHz radio falls below the session threshold.

·     The session gap between the 5 GHz radio and another 5 GHz radio on the same AP falls below the session gap threshold.

Restrictions and guidelines

As a best practice, enable this feature when a large number of clients exist in the network.

This feature takes effect only when an AP has multiple 5 GHz radios.

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.     Configure overloaded 5 GHz radios to hide SSIDs.

wlan radio-load-balance overload-5g ssid-hide { disable | enable [ session value [ gap gap-value ] ] } [ force-logoff ]

By default:

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

¡     In AP group view, overloaded 5 GHz radios hide SSIDs.

Display and maintenance commands for WLAN radio load balancing

Execute the display command in any view.

 

Task

Command

Display radio load balancing information for radios that are bound to a service template.

display wlan radio-load-balance status service-template template-name client mac-address

WLAN radio load balancing configuration examples

Example: Configuring WLAN radio load balancing

Network configuration

As shown in Figure 2, AP 1 and AP 2 are managed by the AC and the clients can discover the APs. Client 1 associates with AP 1, and Client 2 through Client 4 associate with AP 2.

Configure the AP to perform radio load balancing on radios of AP 1 and AP 2 when the following conditions are met:

·     The number of sessions on a radio of an AP reaches 3.

·     The session gap between the radio and the radio that has the fewest sessions reaches 2.

Figure 2 Network diagram

Procedure

# Create wireless service template 1, and set its SSID to rlb.

<AC> system-view

[AC] wlan service-template 1

[AC-wlan-st-1] ssid rlb

[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 WA536-WW

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

 # Bind service template 1 to radio 2 of AP 1.

[AC-wlan-ap-ap1] 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

# Create AP template ap2, and specify the model and serial ID.

[AC] wlan ap ap2 model WA536-WW

[AC-wlan-ap-ap2] serial-id 210235A29G007C000021

 # Bind service template 1 to radio 2 of AP 2.

[AC-wlan-ap-ap2] radio 2

[AC-wlan-ap-ap2-radio-2] service-template 1

[AC-wlan-ap-ap2-radio-2] radio enable

[AC-wlan-ap-ap2-radio-2] quit

[AC-wlan-ap-ap2] quit

# Enable WLAN radio load balancing, and set the session threshold and session gap threshold to 3 and 2, respectively.

[AC] wlan radio-load-balance enable mode session 3 gap 2

# Set the RSSI threshold to 30.

[AC] wlan radio-load-balance rssi-threshold 30

# Set the maximum number of denials for association requests to 4.

[AC] wlan radio-load-balance access-denial 4

Verifying the configuration

# Verify that the AC performs radio load balancing on radios of AP 1 and AP 2 when the following conditions are met:

·     The number of sessions on radio 2 of AP 2 reaches 3.

·     The session gap between radio 2 of AP 2 and radio 2 of AP 1 reaches 2. (Details not shown.)

# Verify that radio 2 on AP 1 and radio 2 on AP 2 are load balanced by using the display wlan client command. (Details not shown.)

 

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