Hi, It will be difficult to have fully mesh BGP between PE routers in MPLS network. A single pop itself may have 2 or more PE routers and just for forming neighborship it will be difficult spare interfaces. P routers in MPLS make things easier and will have NLRI informations to any PE routers. To make things more easier you can also use RR which can be at certain locations and through P routers you can have the Reachbility easily. HTH Yogesh.
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