Converting Cisco 877 from ADSL to FTTC

Normally when we deploy FTTC to a client in an MPLS VPN we use the Cisco 887 and bypass the BT installed VDSL modem. On this occasion the client is already fully kitted out with Cisco 877 routers and is not minded to replace them all straight away so we need to check out the config needed. In short we need to stop using the ATM interface and hook up an ethernet interface into the VDSL modem supplied by BT.

Stage 1 – Disable the ATM port

int ATM0

Stage 2 – Create the new vlan and and assign to a switch port

vlan 100

int E3
 switchport access vlan 100

Stage 3 – Create the BVI and enable PPPoE

interface Vlan100
 description *** FTTC ***
 no ip address
 pppoe enable group local
 pppoe-client dial-pool-number 1

Stage 4 – Enable VPDN

vpdn enable
vpdn-group 1

Stage 5 – Set up the dialer interface

interface Dialer0
 mtu 1492
 ip address negotiated
 ip virtual-reassembly
 encapsulation ppp
 dialer pool 1
 ppp chap hostname XXXXXXX
 ppp chap password XXXXXXX

Stage 6 – Add a default route

ip route Dialer0

Thats the lot, it should all work now – Good Luck!

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