The MPLS WG Archive

["Hamid Ould-Brahim" <hbrahim@nortelnetworks.com>]

Maybe another approach to support this particular case is to use a 
generic layer 2 encapsulation over MPLS (sort of "GRE" principles
for layer-2 over MPLS - something like "GLE": generic
layer 2 ensapsulartion over MPLS-). Therefore the end router will
translate from one layer-2 to the other (no need for
interworking). In reality the translation can happen
anywhere in the network.

Assume you have a FR layer-2 carried over MPLS, and
you want the egress point to be ATM. Then you can negotiate up front
how you want to do this translation (between the source and exit point).
as if you have a frame relay over atm interworking interfaces
(of course in this case you don't need anymore 
interworking interfaces). 

Hamid


Luca Martini wrote:
> 
> 
> It could be possible to actually do the internetworking function in the
> end router device.
> In this case the traffic would transit the network in native mode. If it
> came in ATM AAL5,
> the PDUs would be transported unchanged to the egress router , where
> they would be converted to a different protocol. This could be a vendor
> specific feature, and does not have to be done "in the network".
> In this case the end router doing the conversion has all the information
> it could possibly need to do internetworking successfully.
> 
> Luca Martini
> 
> > Robbie Harrell
> > Senior Consultant
> > Callisma
> > 866-543-5737 pager
> > 8772079316@skytel.com
> 
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> Luca Martini Senior Network Architect, Level 3 Communications -
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