56-1
Chapter 56 RADIUS Configuration
56.1 Introduction to RADIUS
56.1.1 AAA and RADIUS Introduction
AAA is short for Authentication, Authorization and Accounting, it provide a consistency framework for the
network management safely. According to the three functions of Authentication, Authorization, Accounting, the
framework can meet the access control for the security network: which one can visit the network device,
which access-level the user can have and the accounting for the network resource.
RADIUS (Remote Authentication Dial in User Service), is a kind of distributed and client/server protocol for
information exchange. The RADIUS client is usually used on network appliance to implement AAA in
cooperation with 802.1x protocol. The RADIUS server maintains the database for AAA, and communicates
with the RADIUS client through RADIUS protocol. The RADIUS protocol is the most common used protocol in
the AAA framework.
56.1.2 Message structure for RADIUS
The RADIUS protocol uses UDP to deliver protocol packets. The packet format is shown as below.
Figure 56-1 Message structure for RADIUS
Code field(1octets): is the type of the RADIUS packet. Available value for the Code field is show as below:
1． Access-Request
2． Access-Accept
3． Access-Reject
4． Accounting-Request
5． Accounting-Response
6． Access-Challenge
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