To configure 802.1X authentication on an interface:
[edit]user@host# edit protocols dot1x [edit protocols dot1x]user@host# set authenticator
interface ge-0/0/5 supplicant multiple
[edit protocols dot1x]user@host# set
authenticator interface ge-0/0/5/0 reauthentication 120
[edit protocols dot1x]user@host# set
authenticator interface ge-0/0/5 supplicant-timeout 5
[edit protocols dot1x]user@host# set
authenticator interface ge-0/0/5 server-timeout 5
[edit protocols dot1x]user@host# set
authenticator interface ge-0/0/5 transmit-period 60
[edit protocols dot1x]user@host# set
authenticator interface ge-0/0/5 maximum-requests 5