How to configure Spectrum Load Balancing in Aruba Instant? What are the parameters and their default values?

Aruba Employee
Aruba Employee

Spectrum Load Balancing (SLB) is a new feature added in InstantOS 3.3, when enabled, the clients are assigned to less loaded channels balancing them across channels among IAPs in a cluster.


This article details on how to enable and configure Spectrum Load Balancing on IAP.


ARM (Adaptive Radio Management) must be enabled for the Spectrum Load Balancing to function.


Environment : This article applies to all Aruba Instant Access Points running Aruba InstantOS or higher.



By default Spectrum Load Balancing is enabled on IAP. However, follow below steps to enable:

From GUI:


  1. Login to web interface of IAP 
  2. In the top-right menu, clicn on "RF"
  3. From the dropdown, select "Enabled" for Spectrum Load Balancing
  4. For further configuration parameters related to SLB, click on "Show Advance Options"
  5. Here, SLB calculating interval, SLB neighbor matching % and SLB Threshold can be configured.
  6. Once finish, click OK.


Below is the screenshot from GUI:



The functionality of SLB in Instant APs is controlled by three(3) configuration parameters as shown below:
  • SLB Calculating Interval: This interval which is mentioned in seconds determines how often spectrum load balancing must be calculated. Default: 30 seconds. Range: 100-600
  • SLB Neighbor Matching:  Value here indicates the percentage (%) for comparing client density of IAP neighbors to determine the client load on a specific AP channel. Default: 75% Range: 20% - 100%
               Note: Lower value in SLB Neighbor Matching triggers SLB easily and effectively.
  • SLB Threshold: Number here indicates the number of clients on a channel. This value is used to calculate client count threshold. When the load for an AP reaches or exceeds the client count threshold, load balancing is enabled on the AP. Default: 2 Range: 1-20
           Note: Lower value here helps SLB to trigger easily and thereby balance the clients among   IAPs in the cluster.
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Last update:
‎07-03-2014 06:43 PM
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