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In contrast with other VPN technologies, MPLS VPN supports optimum any-toany connectivity between customer sites (equivalent to the full mesh of overlay VPN networks) without the end customer having to manually configure anything. The provider only needs to configure the VPN in the Provider Edge (PE) routers. The so-called “hub-and-spoke” topology, which was primarily used to reduce the cost of the network, is no longer needed. The interconnection of CE sites is done automatically by using BGP and an IGP to find the shortest path | MPLS VPN Topologies Overview This chapter describes the most commonly used MPLS VPN topologies and the design and implementation issues associated with them. It includes the following topics n Simple VPN with optimal Intra-VPN routing n Using BGP as the PE-CE routing protocol n Overlapping Virtual Private Networks n Central Services VPN solutions n Hub-and-Spoke VPN solutions n Managed CE Router Service Objectives Upon completion of this chapter you will be able to perform the following tasks n Design and implement simple VPN solutions with optimal intra-VPN routing n Design and implement various routing protocols within VPNs n Design and implement central services VPN topologies n Design and implement hub-and-spoke VPN topologies n Design and implement VPN topology required for managed router services Simple VPN with Optimal Intra-VPN Routing Objectives Upon completion of this section you will be able to perform the following tasks n Describe the requirements of simple VPN solutions n Describe the routing model of these solutions n Describe the optimal intra-VPN routing data flow n Select the optimal PE-CE routing protocol based on user requirements n Integrate the selected PE-CE routing protocol with the MPLS VPN backbone MP-BGP routing 2 MPLS VPN Topologies Copyright 2000 Cisco Systems Inc. Simple VPN Requirements Summary Any site router can talk to any other site Optimum routing across P-network is desired 2000 Cisco Systems Inc. www.cisco.com Chapter 1 -5 In contrast with other VPN technologies MPLS VPN supports optimum any-to-any connectivity between customer sites equivalent to the full mesh of overlay VPN networks without the end customer having to manually configure anything. The provider only needs to configure the VPN in the Provider Edge PE routers. The so-called hub-and-spoke topology which was primarily used to reduce the cost of the network is no longer needed. The interconnection of CE sites is done automatically by using BGP and an IGP to find the
