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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Internet Access

Internet routing is usually done via the BGP table of the MPLS VPN network of the service provider. This BGP table is in the global routing space, not in the VRF context. By default, the VRF sites can communicate only with other VRF sites in the same VPN, not with anything in the global routing space. Therefore, something must be done to provide Internet access (global context) to the CE routers (VRF context). The following sections detail how to provide Internet access to VRF sites. Obviously, Internet access is only possible for the IP subnets of the customer that are not from the private IP addressing space (RFC 1918).

Note

As soon as the VPN has Internet connectivity, there is a potential security risk. It is important to ...

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