1. Log in to MA5200F and enable Debug to gather Radius packets;
2. Look up the authentication request packet of Code＝1; it contains the MAC address of user (No. 31 or 26-60 attribute), that is to say, MA5200F has notify the MAC address of the user to Radius;
3. Check the configurations of Radius. It is found that Radius sets BAS type to ZXT64E,so the problem is solved after changing it to Huawei MA5200F.