[j-nsp] l2circuit for ATM cells carrying IP/MPLS traffic

[alex]

<quote>
[CE router]---ATM----[PE router]--GE--[PE router]----ATM-----[CE router]

This connection works only if on CE routers (cisco) IP traffic is
transmitted but doesn't work if IP/MPLS is used on CE routers.
I think the problem is caused by encapsulation used on CE routers.
Unfortunately cell-relay mode on one of PE routers can not be used (what
in my opinion should solve the problem).
Is there any way to solve this problem without changing to cell-relay
mode on PE routers?

</quote>
The problem could be that Cisco CE routers are sending out F5 OAM cells which are NOT AAAL5-encapsulated and therefore cannot get through. The result is the ATM (sub)interface on CE boxes being DOWN
and not capable of sending anything. In cell-relay mode all cells are getting through and IP/MPLS link works. 
HTH
Cheers
Alex