with cluster solution do i need to configure one access point as master and the others as slave?
In thi8s case, the access point release is 2.0 (1) and connected with UC540. The lan interface on UC 540 is configured as access point vlan native 1. This system doesen't work correctly. Phones spa525g2 are not always connected, i nedd to reset very frequently the access point.
With the AP541 N there is not an option for Master vs Slave the Clustering option is really only for allowing the clustered AP541N to share configuration settings and changes.
With using this in a UC540 Network I would suggest calling in and opening a case with our UC support group here in the small business support center.They have good experience with setting up the AP541N in a UC network.
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