3Com Switch 7750 Configuration Guide

512 CHAPTER 49: AAA & RADIUS & HWTACACS CONFIGURATION
4 The Authenticator field (16 bytes) is used to verify the packet returned from the
RADIUS server; it is also used in the password hiding algorithm. There are two
kinds of authenticators: Request and Response.
5 The Attribute field contains special authentication, authorization, and accounting
information to provide the configuration details of a request or response packet.
This field is represented by a field triplet (Type, Length and Value):
■ The Type field (one byte) specifies the type of the attribute. Its value ranges
from 1 to 255. Table 396 lists the attributes that are commonly used in RADIUS
authentication and authorization.
■ The Length field (one byte) specifies the total length of the Attribute field in
bytes (including the Type, Length and Value fields).
■ The Value field (up to 253 bytes) contains the information about the attribute.
Its content and format are determined by the Type and Length fields.
The RADIUS protocol takes good scalability. Attribute 26 (Vender-Specific) defined
in this protocol allows a device vendor to extend RADIUS to implement functions
that are not defined in standard RADIUS.
Figure 130 depicts the structure of attribute 26. The Vendor-ID field representing
the code of the vendor occupies four bytes. The first byte is 0, and the other three
bytes are defined in RFC1700. Here, the vendor can encapsulate multiple
Table 396 RADIUS attributes
Value of the
Type field Attribute type
Value of the
Type field Attribute type
1 User-Name 23 Framed-IPX-Network
2 User-Password 24 State
3 CHAP-Password 25 Class
4 NAS-IP-Address 26 Vendor-Specific
5 NAS-Port 27 Session-Timeout
6 Service-Type 28 Idle-Timeout
7 Framed-Protocol 29 Termination-Action
8 Framed-IP-Address 30 Called-Station-Id
9 Framed-IP-Netmask 31 Calling-Station-Id
10 Framed-Routing 32 NAS-Identifier
11 Filter-ID 33 Proxy-State
12 Framed-MTU 34 Login-LAT-Service
13 Framed-Compression 35 Login-LAT-Node
14 Login-IP-Host 36 Login-LAT-Group
15 Login-Service 37 Framed-AppleTalk-Link
16 Login-TCP-Port 38 Framed-AppleTalk-Network
17 (unassigned) 39 Framed-AppleTalk-Zone
18 Reply-Message 40-59 (reserved for accounting)
19 Callback-Number 60 CHAP-Challenge
20 Callback-ID 61 NAS-Port-Type
21 (unassigned) 62 Port-Limit
22 Framed-Route 63 Login-LAT-Port