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set interfaces pt-1/0/0 mtu 1530
set interfaces pt-1/0/0 vdsl-options vdsl-profile 17a
set interfaces pt-1/0/0 unit 0 encapsulation ppp-over-ether
set interfaces pt-1/0/0 unit 0 vlan-id 10
set interfaces pp0 unit 0 ppp-options pap default-password "<<VDSL Password>>"
set interfaces pp0 unit 0 ppp-options pap local-name <<VDSL Username>>
set interfaces pp0 unit 0 ppp-options pap local-password "<<VDSL Password>>"
set interfaces pp0 unit 0 ppp-options pap passive
set interfaces pp0 unit 0 pppoe-options underlying-interface pt-1/0/0.0
set interfaces pp0 unit 0 pppoe-options idle-timeout 0
set interfaces pp0 unit 0 pppoe-options auto-reconnect 2
set interfaces pp0 unit 0 pppoe-options client
set interfaces pp0 unit 0 family inet negotiate-address
set interfaces vlan unit 0 family inet address <<internal IP range>>/24
set routing-options static route 0.0.0.0/0 next-hop pp0.0
set routing-options generate route 0.0.0.0/0

MTU calculation:

PPP FCS = 4
Payload = 1472
ICMP Header = 8
IPv4 header = 20
PPP header = 2
PPPoE Header = 6
Vlan tag = 4
Ethernet Header = 14
                           = 1530