CE:- This is the customers interface to the service providers network. This is typically an L3 aware box.
The ce routers exchange routing information with other CE routers it also exchange routing info with the pe.
PE: This interface between the customer and the service provider.
Functions of PE:-
a.> Run a common routing protocol in the provider core between other routers and the PE.
b> Run a second routing protocol this is done to exchange the VPRN routes this is done between the PE.
c> Run a routing protocol between the PE and the CE.
These routers are aware of the MPLS running and the VPRN.
P routers:-
These are the provider core routers, they may have intercnnection with the PE routers or other P routers but they will never be connected with the CE routers.
In this case the MPLS functions are enabled but the boxes are not aware of the vprn services.
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