Few days ago. Me and my colleague were struggling with a configuration to enable internet access to a Fiber internet connection of KPN (it wasn’t a business line but a home user internet connection)
To enable this configuration. You can do the following:
On the internet interface (we used a HWIC-4ESW) the following commands. (With a business line the internet interface is not in a TRUNK mode).
interface FastEthernet0/3/1 description CAP-ID INT Poortnummer met E-nmr switchport trunk allowed vlan 1,6 ( native should be there ) switchport mode trunk mac-address <clone mac address of kpn experiabox> duplex full speed 100
Add a VLAN interface with the number 6. (You use an different interface first you can look to the VDSL Configuration https://glazenbakje.wordpress.com/2010/03/22/cisco-ios-router-vdsl-configuration-dutch-isp/)
interface Vlan6 no ip address load-interval 30 pppoe enable group global pppoe-client dial-pool-number 12
This dialer interface is pretty standard for a pppoe configuration
interface Dialer12 description Customer Traffic PPPoE Connection mtu 1492 ip address negotiated ip verify unicast reverse-path no ip redirects no ip proxy-arp ip nat outside no ip virtual-reassembly encapsulation ppp dialer pool 12 dialer-group 12 no cdp enable ppp pap sent-username <mac address KPN Experiabox>@direct-adsl password KPN ppp ipcp mask request ppp ipcp address accept
This internet interface had a 100mb/s download and upload.