Carrier supporting carrier and AToM

Unanswered Question
Feb 13th, 2007

Hello all,

Do any of you has already done any configurations with CSC (where the customer carrier provides MPLS VPN service) and Pseudo-wires on top of it?

At first glance there should be no problems right? Any problems/issues to be aware?

Thanks in advance

I have this problem too.
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mheusinger Tue, 02/13/2007 - 08:36


from an MPLS perspective it does not matter what the payload of a labeled packet is arriving at the core carriers PE. The only real issue I can see now is the MTU end-to-end. AToM requires L2-Frame plus label stack to be within the interface MTU of all interfaces taking part in transportation.

So your core carrier must accept MTUs larger than 1500 Bytes and also have deployed them throughout his MPLS cloud.

Or to rephrase this: you might need to lower the MTU offered to the AToM customer based on the core carrier MTU.

Hope this helps!

Regards, Martin


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