Large-Scale MPLS VPN Deployment

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Large-Scale MPLS VPN Deployment

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A network designer that wants to design a scalable MPLS VPN solution is always faced with a number of scalability issues, several of them being related to the MPLS VPN architecture: n MPLS VPN uses internal BGP (IBGP) to propagate VPNv4 routes between PE routers. Default IBGP implementation requires a full-mesh of BGP sessions between PE routers—a design that is only appropriate for very small networks. n As the number of MPLS VPN customers grows, the PE routers have to store more and more customer routes (in traditional overlay VPN implementations, the customer routes are not seen by the provider routers—this issue is therefore not present in overlay VPN implementations)....

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