加密的授权,Datagram Transport Layer Security (DTLS) is required for all OfficeExtend deployments to encrypt the Data Plane traffic. Customers planning to install this device physically in Russia must order the controller with DTLS disabled and then obtain a physical PAK in order to enable a DTLS license and should not download the license from Cisco.com. Please consult your local government regulations to ensure that Data DTLS encryption is permitted. http://www.cisco.com/c/en/us/products/collateral/wireless/5500-series-wireless-controllers/data_sheet_c78-521631.html