Option 1: Inter-Provider VPN Using Back-to-Back VRF Method
The VRF-to-VRF approach is the simplest method for allowing MPLS VPN providers to exchange VPN routing information for CE sites in different MPLS domains. In this approach, the border provider edge (PE) routers residing in different autonomous systems function as ASBRs. These ASBRs are interconnected either via a single link consisting of logical subinterfaces or via multiple physical links. VRFs are configured on the ASBRs to collect VPN client routes. Each subinterface or interface connected between the ASBRs is dedicated to a single client VRF. The single client VRF can run eBGP, RIPv2, EIGRP, OSPF, or static routing to distribute the VPN routes to its adjacent peer. The use of eBGP ...
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