SWITCH 300-115 2.1 Configure and verify switch security features

2.1.d Port security

802.1x config example:

Switch(config)# aaa new-model
Switch(config)# radius-server host 10.1.1.1 key SECRET
Switch(config)# radius-server host 10.1.1.2 key SECRET2
Switch(config)# aaa authentication dot1x default group radius
Switch(config)# dot1x system-auth-control
Switch(config)# interface range gigabitethernet1/0/1 – 40
Switch(config-if)# switchport access vlan 10
Switch(config-if)# switchport mode access
Switch(config-if)# dot1x port-control auto

see: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/sw8021x.html