Cisco Systems 3560 Manual De Usuario

For more information, see the command reference for this release.

During 802.1x authentication, depending on the switch port state, the switch can grant a client access to 
the network. The port starts in the unauthorized state. While in this state, the port that is not configured 
as a voice VLAN port disallows all ingress and egress traffic except for 802.1x authentication, CDP, and 
STP packets. When a client is successfully authenticated, the port changes to the authorized state, 
allowing all traffic for the client to flow normally. If the port is configured as a voice VLAN port, the 
port allows VoIP traffic and 802.1x protocol packets before the client is successfully authenticated.

If a client that does not support 802.1x authentication connects to an unauthorized 802.1x port, the 
switch requests the client’s identity. In this situation, the client does not respond to the request, the port 
remains in the unauthorized state, and the client is not granted access to the network.

In contrast, when an 802.1x-enabled client connects to a port that is not running the 802.1x standard, the 
client initiates the authentication process by sending the EAPOL-start frame. When no response is 
received, the client sends the request for a fixed number of times. Because no response is received, the 
client begins sending frames as if the port is in the authorized state.

You control the port authorization state by using the authentication port-control or dot1x port-control 
interface configuration command and these keywords:

force-authorized—disables 802.1x authentication and causes the port to change to the authorized 
state without any authentication exchange required. The port sends and receives normal traffic 
without 802.1x-based authentication of the client. This is the default setting.

force-unauthorized—causes the port to remain in the unauthorized state, ignoring all attempts by 
the client to authenticate. The switch cannot provide authentication services to the client through the 
port.

Enable the MAC authentication bypass feature.

Enable periodic re-authentication of the client.

authentication port-control {auto 
| force-authorized | force-un 
authorized}

Enable manual control of the authorization state of 
the port.

Set the 802.1x timers.

authentication violation {protect | 
restrict | shutdown}

dot1x violation-mode {shutdown 
| restrict | protect}

Configure the violation modes that occur when a 
new device connects to a port or when a new 
device connects to a port after the maximum 
number of devices are connected to that port.

Display 802.1x statistics, administrative status, 
and operational status for the switch or for the 
specified port.