Controllerless Networks

Currently i do deploy 3 units of IAP105 and either 1 of them configure as master AP and the other 2 units as slave. To confirm the deployment in order i have disconnect the master unit and the other 2 units slave IAP are stilll able to working fine but when i deploy back the master unit it can be connected back to the network and not able to broadcast at all. Any issue on my configuration? and currently my IAP is running on version 6.1.2.3

That should just work seemlessly. The first AP to come up is the master but when that goes down there will be an election and one of the others will take over as master.

You haven't given much information regarding the configuration of this deployment... so it's difficult to help.

my deployment info as below,

3 units of IAP and each unit IAP broadcast Employee and Guest SSID;

Vlan 1 ( management Vlan ) 192.168.1.2 ; 192.168.1.3 ; 192.168.1.4

Vlan 2 ( Employee Vlan )

Vlan 3 ( Guest Vlan )

Virtual IP 192.168.1.2 ( same as one of the management vlan IP )

Have you tried to configure the virtual controller IP to be something other than 1.2, 1.3, or 1.4?  The VC IP is not supposed to overlap any of the AP IPs.

Thanks for the advice, i have change the virtual Controller IP address to another now is working fine.

That bit me at first, too.  I read this correction on the old boards.