3.3.4 Higher-Layer Triggered Events
The Extensible Authentication Protocol Method for Microsoft CHAP is initialized on the EAP server when it is invoked by EAP as an authentication method. This occurs when an EAP-enabled protocol, such as RADIUS [RFC2865], invokes EAP. The EAP server proposes the use of the Extensible Authentication Protocol Method for Microsoft CHAP by sending a Challenge-Request message to the peer.<5>