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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) | Large-Scale MPLS VPN Deployment Overview This chapter describes scalability issues encountered in large-scale MPLS VPN networks and presents a number of solutions that allow these networks to scale while growing. It includes the following topics n MP-BGP Scalability Mechanisms n Partitioned Route Reflectors Objectives Upon completion of this chapter you will be able to perform the following tasks n Understand the MP-BGP scaling issues in large-scale MPLS VPN backbones n Describe the built-in scalability mechanisms n Design and implement networks using partitioned BGP route reflectors MP-BGP Scalability Mechanisms Objectives Upon completion of this section you will be able to perform the following tasks n Understand MP-BGP scaling issues n Describe the automatic filtering in MP-BGP n Describe the functions of the BGP Route Refresh feature n Describe the Outbound Route Filter feature and its benefits 2 Large-Scale MPLS VPN Deployment Copyright 2000 Cisco Systems Inc. Scaling Existing BGP techniques can be used to scale the route distribution route reflectors Each edge PE router needs only the information for the VPNs it supports Only routes for VRFs are configured on the PE router Route-reflectors are used to distribute VPN routing information 200Q Cisco Systems Inc. WWW.cisco.com Chapter 4-5 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 . In very .
