Here is a sample config for PPPoE configuration. Replace interface names, usernames and passwords with the right ones for you network.
Authentication details should come from your ISP.


vpdn enable
no vpdn logging
!
vpdn-group 1
request-dialin
protocol pppoe
!
!
!
!
interface FastEthernet0/0
description My LAN
ip address 10.0.0.0 255.255.255.0
ip nat inside
!
interface FastEthernet0/1
description Connection To PPPoE Supplier
no ip address
pppoe enable
pppoe-client dial-pool-number 1
!
interface Dialer1
ip address negotiated
ip nat outside
ip mtu 1492
encapsulation ppp
no ip mroute-cache
dialer pool 1
dialer-group 1
ppp authentication pap
ppp pap sent-username “username” password “password”
!
dialer-list 1 protocol ip permit
ip nat inside source list 1 interface Dialer1 overload
ip route 0.0.0.0 0.0.0.0 dialer1
access-list 1 permit 10.0.0.0 0.0.0.255