You can send RADIUS messages through a Layer 3 VPN routing instance to customer RADIUS servers in a private network. To configure, include the routing-instance statement at the [edit access profile profile-name radius-server] hierarchy level and apply the profile to an interface with the access-profile statement at the [edit interfaces interface-name unit logical-unit-number ppp-options chap] hierarchy level. For more information, see the JUNOS System Basics Configuration Guide.