PPP configuration

[laszlozo]

I use the following configuration snippet on a ISR4k router connected to an MPLS circuit.

!
interface FastEthernet0/0/1
mtu 1774
no ip address
load-interval 30
negotiation auto
!
!
interface FastEthernet0/0/1.1111
encapsulation dot1Q 1111
no ip unreachables
pppoe enable group global
snmp trap link-status
pppoe-client dial-pool-number 1 service-name "xxx"
pppoe-client ppp-max-payload 1766
!
!
interface Dialer1
mtu 1766
ip unnumbered Loopback1111
no ip unreachables
encapsulation ppp
dialer pool 1
keepalive 3 3
!
!
interface Loopback1111
ip address 11.11.11.11 255.255.255.255
no ip unreachables
!
!

I dont really understand how this PPPoE really works without authentication like CHAP or PAP. What am I missing here?

[MHM Cisco World]

Auth is optional 

[balaji.bandi]

most of the time you configure dialer interface with PPP username and password to authenticate with PPPoE , not sure what is the agreement here with MPLS.

can you post show ip interface brief, show ip route ? (is thsi link working ?)