802.1x configuration

Why to use dot1x authentication ? dot1x authentication can be used to secure access to the network. 
•enable “aaa” on the switch “ aaa new-model”

•Define external radius-servers:

–Radius-server host hostname | ip-address} key string

•Define the authentication method for 802.1x

–Aaa authentication dot1x default group radius

•Enable 802.1x globally “dot1x system-auth-control”

•Configure each switchport that uses 802.1x

–Switch(config-if)#dot1x port-control {force-authorized | force-unauthorized | auto}

•Force-authorized: the port always authorize any connected client (default state)

•Force-unauthorized: the port is forced to never authorize any connected client (client need to disconnect/reconnect)

•Auto: the port uses 802.1x exchange to move from unauthorized to the authorized state

•Allow multiple hosts on a switchport

–Dot1x host-mode multi-host

•“show dot1x all”

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