Quick mini-howto configure PPPoE client on Cisco IOS.
interface Ethernet0/1
no ip address
pppoe enable
pppoe-client dial-pool-number 1interface Dialer1
mtu 1492
ip address negotiated
ip nat outside
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer-group 1
ppp pap sent-username USERNAME password PASSWORD
ppp ipcp dns request
Ethernet0/1 = interface to PPPoE provider
USERNAME, PASSWORD = your assigned PPPoE username and password
Tested with RDS FTTH, at least with
C2600 Software (C2600-C-M), Version 12.3(19)
Check with show pppoe session, show interface dialer 1.
Do not forget about default route (and NAT if applicable).