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Linking VRF Tables Between Autonomous Systems

You can connect two separate ASs by simply linking the VPN routing and forwarding (VRF) table in the AS border router of one AS to the VRF table in the AS border router in the other AS. Each AS border router must contain a VRF instance for every VPN configured in both service provider networks. You then configure an IP session between the two AS border routers. In effect, the AS border routers treat each other as customer edge (CE) routers.

Because of the complexity of the configuration, particularly with regard to scaling, this method is not recommended. The details of this configuration are not provided in this manual.

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