3Com Switch 7750 Configuration Guide Guide

520 CHAPTER 48: AAA & RADIUS & HWTACACS CONFIGURATION
[SW7750-hwtacacs-hwtac] user-name-format without-domain
[SW7750-hwtacacs-hwtac] quit
# Configure the domain name of the HWTACACS scheme to hwtac.
[SW7750] domain hwtacacs
[SW7750-isp-hwtacacs] scheme hwtacacs-scheme hwtac
Troubleshooting AAA
& RADIUS &
HWTACACS
Configuration
Troubleshooting the
RADIUS Protocol
The RADIUS protocol is at the application layer in the TCP/IP protocol suite. This
protocol prescribes how the switch and the RADIUS server of the ISP exchange
user information with each other.
Symptom 1: User authentication/authorization always fails.
Possible reasons and solutions:
■ The user name is not in the userid@isp-name format, or no default ISP domain
is specified on the switch - Use the correct user name format, or set a default
ISP domain on the switch.
■ The user is not configured in the database of the RADIUS server - Check the
database of the RADIUS server, make sure that the configuration information
about the user exists.
■ The user input an incorrect password - Be sure to input the correct password.
■ The switch and the RADIUS server have different shared keys - Compare the
shared keys at the two ends, make sure they are identical.
■ The switch cannot communicate with the RADIUS server (you can determine by
pinging the RADIUS server from the switch) - Take measures to make the
switch communicate with the RADIUS server normally.
Symptom 2: RADIUS packets cannot be sent to the RADIUS server.
Possible reasons and solutions:
■ The communication links (physical/link layer) between the switch and the
RADIUS server is disconnected/blocked - Take measures to make the links
connected/unblocked.
■ None or incorrect RADIUS server IP address is set on the switch - Be sure to set
a correct RADIUS server IP address.
■ One or all AAA UDP port settings are incorrect - Be sure to set the same UDP
port numbers as those on the RADIUS server.
Symptom 3: The user passes the authentication and gets authorized, but the
accounting information cannot be transmitted to the RADIUS server.
Possible reasons and solutions: