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Introduction to AAA Server
RADIUS Overview
Chapter 1 3
Figure 1-1 Generic AAA Network Topology
Establishing a RADIUS Session
The handling of a user request is series of message exchanges that attempts to provide the
user with a network service by establishing a session for the user. This transaction can be
described as a series of actions that exchange data packets containing information related to
the request. Figure 1-2, Client-Server RADIUS Transaction, illustrates the details of the
AAA4.ISP.net
location: Detroit
NAS1
NAS2
NAS3
NAS4
location: Ann Arbor
AAA1.ISP.net
AAA2.ISP.net
location: Flint
AAA3.ISP.net
location: Kalamazoo
Repository
Repository
Repository
Repository
Organization
F User
E User
Organization
Organization
D User
C User
Organization
Organization
B User
A User
Organization
A forwarding server sends
proxied Access-Requests
AAA servers and NASs Users dial-in
to a remote server
exchange requests/replies to a NAS