Orange Labs Orange Labs INSIDE Secure Huawei Network Zen The EAP Re-authentication Protocol (ERP) defines extensions to the Extensible Authentication Protocol (EAP) to support efficient re-authentication between the peer and an EAP Re-authentication (ER) server through a compatible authenticator. This document specifies Diameter support for ERP. It defines a new Diameter ERP application to transport ERP messages between an ER authenticator and the ER server, and a set of new Attribute-Value Pairs (AVPs) that can be used to transport the cryptographic material needed by the re-authentication server.