[c-nsp] ASR920 l2cp over mpls xconnect

[cnsp at marenda.net]

Hi,

i got two ethernet-links, 
- one between me-3800'x and 
- one between me-3800 and asr920.
They have been created doing mpls-xconnect's.

Connecting my own "CE2.0" CPE's, 
- on the first link, my OAM's find their way, everything OK.
- On the Circuit with the asr920, the OAM's don't come out on the other end,
  so my NNI Ports are marked "down".
  (disabling OAM, LLDP neighborhood comes up, my inband-mgmt is working,
...)

I do not have access to those devices from our carrier,
and have not got exact model and IOS Version.
Is there any special to configure? 
Something like "l2cp tunnel all" ?

(I found "transparent-cfm" but this is in the context of
CarrierEthernetConfig and not MPLS.)

I hope that STP BPDUs will be transported (in both directions) over that
xconnect.

Thank you for any ideas,

Juergen.