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I have just upgraded from FTTC (vdsl) to FTTP supplied by City Fibre. I was and still am using my Cisco 891F router.
With FTTC I was using an old BT modem so I had an Ethernet WAN connection to that, with no sub interfaces or VLANS.
After reading about VLAN 911 on various forums I created a sub interface on the WAN Ethernet port (VLAN 911) and modified the dialer configuration accordingly and got connected using my existing Vodafone credentials.
However, two days later (today) the connection went down and debugging my router showed I had a PPPoE authentication error. I contacted Vodafone support and got new credentials and all is working again.
For those interested here are the relevant bits of configuration.
interface GigabitEthernet8
description **** Ethernet to ONT ****
no ip address
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet8.911
encapsulation dot1Q 911
pppoe enable group global
pppoe-client dial-pool-number 1
!
interface Dialer0
description **** Interface to Internet ****
mtu 1492
ip address negotiated
ip access-group INTERNET-IN in
ip nat outside
ip inspect NetDNA-FW out
ip virtual-reassembly in
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 1
dialer idle-timeout 0
dialer persistent
dialer-group 1
no cdp enable
ppp mtu adaptive
ppp chap hostname dsl*******@broadband.vodafone.co.uk
ppp chap password 0 ********
ppp ipcp dns request
ppp ipcp route default
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