Enabling "preferred master" on Instant AP (IAP) does not work if "Instant" is broadcast.

MVP Expert
MVP Expert


  WLAN administrator can enforce a particular Instant AP to act as a Master.

Starting from InstantOS version  we can selectively choose one of the member in the cluster and set it as "Preferred Master".

Provisioning of IAP as a master can be done by using the Instant UI or CLI.

But enabling this option in a specific AP will not take effect if factory default SSID "Instant" is still being broadcasted.



Two APs in cluster (AP1 & AP2) with AP1 initially acting as master. Factory-default SSID "Instant" is seen broadcasted.



Set "preferred master" to enable for AP-2 and then reboot the specific AP for the changes to take effect.


Once the AP reboots and comes up you could see the AP being set to "Init ---> slave" during the boot process and the AP-2 continues to act as slave irrespective of preferred master being set.

To verify that the config is present please execute #show ap-env on AP-2

AP2# show ap-env

Antenna Type:Internal
iap_master:1      ---------> this indicates that the preferred master has been set to "enable"



To make the specific AP act as preferred master we have to configure a non-factory default SSID so that the "instant" SSID gets removed.

Now go to AP2 --- 'Edit' and enable "preferred master". Reboot the specific AP for changes to take effect.

AP2 comes up as a master AP and then the AP1 reboot itself and joins the cluster as a slave.


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Revision #:
3 of 3
Last update:
‎05-28-2016 02:15 AM
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