pppoe on 802.1q with cos

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I search a configuration for a CPE (cisco 800 or 1700 or 1800).

I have tu use an Ethernet port (not the ATM interface, I have a modem).
I have to tag all my packet with a vlan ID (ID 2900 so ISL not working) in
I have to tag all my packet witch CoS (at 2 or 4).

The configuration work if I have the pppoe-client on my interface directly but
it's not tagged in 802.1q and my provider need it.

Do you have some other configuration for that ?

The relevant configuration :

interface FastEthernet0/0
 no ip address
 speed 100
 pppoe-client dial-pool-number 1
interface Dialer0
 description PPPoE to ISP
 mtu 1492
 ip address negotiated
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 ip flow ingress
 ip nat outside
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer idle-timeout 270
 dialer-group 1
 keepalive 5 2
 ppp authentication pap chap callin
 ppp chap hostname loing@realm
 ppp chap password xxxxx
 ppp ipcp address accept
ip route Dialer0

What I need is somthing like :

interface FastEthernet0/0.2900
 no ip address
 encapsulation dot1Q 2900
 pppoe-client dial-pool-number 1

but pppoe-client is not supported on subinterface.


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