- you need to load the Aruba radius VSA on the Juniper Device.
Next, you will need to check on the Juniper if the "Aruba-Essid-Name" attribute matches the SSID that you want to deal with. You will then have to return the "Aruba-User-Vlan" attribute with the VLAN that you want the user to be in.
You cannot accomplish this without loading the Aruba radius VSA into your Juniper radius server.