The key components of the config you will need are as follows:
! Radius Config
aaa authentication dot1x default group radius
aaa authorization network default group radius
radius-server host YOUR_SERVER
radius-server key YOUR_KEY
! Enable dot1x globally
! Configure the interfaces
interface range YOUR_RANGE_OF_ACCESS_PORTS
switchport mode access
switchport access vlan YOUR_ACCESS_VLAN
dot1x port-control auto
That is the basic config. You can also get into fancy features, like setting a guest access vlan for when 802.1x authentication fails, etc. The switch configuration is relatively simple. I actually run into more trouble with the radius configuration and configuration of clients for 802.1x pieces.
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