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

[Marcin Garstka]

You are right that OAM cells will not get through a l2circuit with 
atm-cc-vc-mux encapsulation but you can easily switch OAMs off on CISCO 
routers. In this case the Cisco routers will not send and receive OAM cells 
and the subinterfaces will never go down (except for LOS on physical 
interface).
The command is 'no oam-pvc manage' in the configuration of PVC. It works 
with IP over ATM, where ATM was tranmitted via l2circuit with 
atm-ccc-vc-mux encapsulation. I have never tested it with MPLS over ATM.
Marcin



At 18:12 2006-01-29, alex wrote:
><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
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