Inter AS Option C is the most complex, insecure, uncommon, but extremely scalable inter provider MPLS VPN solution.
Inter AS MPLS VPN
Is Inter-AS MPLS VPNs commonly deployed ? In real-life deployment which Inter-AS MPLS VPN Option is most common ? What are the use cases of Inter-AS MPLS VPNs ? This is not a theory post , I will share practical information with you.
Inter AS Option B is highly scalable, reasonably secure, but operationally complex inter autonomous MPLS VPN architecture.
Inter AS Option A is the easiest, most flexible, most secure Inter autonomous system MPLS VPN technology.