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Troubleshooting
Unusual Network Activity
Also, ensure that the switch port used to access the RADIUS server is not
blocked by an 802.1X configuration on that port. For example, show port-
access authenticator < port-list > gives you the status for the specified ports.
Also, ensure that other factors, such as port security or any 802.1X configura-
tion on the RADIUS server are not blocking the link.
The authorized MAC address on a port that is configured for both
802.1X and port security either changes or is re-acquired after
execution of aaa port-access authenticator < port-list > initialize. If the port is
force-authorized with aaa port-access authenticator <port-list> control authorized
command and port security is enabled on the port, then executing initialize
causes the port to clear the learned address and learn a new address from the
first packet it receives after you execute initialize.
A trunked port configured for 802.1X is blocked. If you are using
RADIUS authentication and the RADIUS server specifies a VLAN for the port,
the switch allows authentication, but blocks the port. To eliminate this prob-
lem, either remove the port from the trunk or reconfigure the RADIUS server
to avoid specifying a VLAN.
Radius-Related Problems
The switch does not receive a response to RADIUS authentication
requests. In this case, the switch will attempt authentication using the
secondary method configured for the type of access you are using (console,
Telnet, or SSH).
There can be several reasons for not receiving a response to an authentication
request. Do the following:
■ Use ping to ensure that the switch has access to the configured RADIUS
server.
■ Verify that the switch is using the correct encryption key for the desig-
nated server.
■ Verify that the switch has the correct IP address for the RADIUS server.
■ Ensure that the radius-server timeout period is long enough for network
conditions.
■ Verify that the switch is using the same UDP port number as the server.
RADIUS server fails to respond to a request for service, even though
the server’s IP address is correctly configured in the switch. Use
show radius to verify that the encryption key the switch is using is correct for
the server being contacted. If the switch has only a global key configured, then
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