China Telecom China Telecom Huawei Technologies Verizon Inc. Huawei Technologies This draft defines a new type of Outbound Route Filter (ORF), known as the Virtual Private Network (VPN) Prefix ORF. The VPN Prefix ORF mechanism is applicable when VPN routes from different Virtual Routing and Forwarding (VRF) instances are exchanged through a single shared Border Gateway Protocol (BGP) session.The purpose of VPN Prefix ORF mechanism is to control the overload of VPN routes based on RT. With this mechanism, the overload can be limited within the minimum range.