
C-15
User Guide for Cisco Secure ACS for Windows Server
78-16592-01
Appendix C      RADIUS Attributes
IETF Dictionary of RADIUS AV Pairs
5 NAS-Port Physical port number of the AAA 
client that is authenticating the user. 
The AAA client port value (32 bits) 
consists of one or two 16-bit values, 
depending on the setting of the 
RADIUS server extended 
portnames command. Each 16-bit 
number is a 5-digit decimal integer 
interpreted as follows:
•For asynchronous terminal 
lines, async network interfaces, 
and virtual async interfaces, the 
value is 00ttt, where ttt is the 
line number or async interface 
unit number.
•For ordinary synchronous 
network interfaces, the value is 
10xxx.
•For channels on a primary-rate 
ISDN (Integrated Services 
Digital Network) interface, the 
value is 2ppcc.
•For channels on a basic rate 
ISDN interface, the value is 
3bb0c.
•For other types of interfaces, the 
value is 6nnss.
Integer Inbound No
Table C-6 RADIUS (IETF) Attributes (continued)
Number Name Description
Type of 
Value
Inbound/Out
bound Multiple