[c-nsp] ATOM Basic Question

Oliver Boehmer (oboehmer) oboehmer at cisco.com
Mon Oct 11 08:43:51 EDT 2004

>   With MPLS-VPN the provider is involved in the customer
> routing. That's to say the CE next hop is the PE router of the
>    Now, if I am having a customer where he is having
> Frame-Relay L2 service.
> The provider role here is on L2 level only and L3 is done
> between customer router only. Now if I am interested to offer ATOM
such that
> the customer is still getting from me Frame-Relay service and it is
> over the MPLS backbone. What will be the next-hop for the customer?
Will it be the
> provider PE router - like the case of MPLS-VPN -, or the Provider
> will be totally transparent for the customer and the customer
> next-hop will be his other branch ?

With ATOM, the MPLS network is (more or less) transparent, 100%
transparent from a Layer3 perspective.. I say "more or less" because
some some L2 stuff like OAM for ATM is performed on the PE.. for example
you can basically replace a legacy Frame-relay L2 service by ATOM..


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