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Additional info for Advanced MPLS VPN Solutions (AMVS) 1.0
Overlay VPN Hub-and-Spoke Topology Remote site (spoke) Central site (HUB) Remote site (spoke) Central site router Remote site (spoke) Service Provider Network Remote site (spoke) © 2000, Cisco Systems, Inc. com Page33 The hub-and-spoke topology is the simplest overlay VPN topology – all remote sites are linked with a single virtual circuit to a central CE-router. The routing is also extremely simple – static routing or distance-vector protocol like RIP are more than adequate. If you are using dynamic routing protocol like RIP, splithorizon must be disabled at the hub router, or you must use point-to-point subinterfaces at the hub router to overcome the split-horizon problem.
What is the difference between a simple VPN and a Central Services VPN? ■ What are the connectivity requirements of a Central Services VPN? Advanced MPLS VPN Solutions Copyright 2000, Cisco Systems, Inc. MPLS VPN Architecture Objectives Upon completion of this section, you will be able to perform the following tasks: ■ Understand the difference between traditional peer-to-peer models and MPLS VPN ■ List the benefits of MPLS VPN ■ Describe major architectural blocks of MPLS VPN ■ Explain the need for route distinguisher (RD) and route target (RT) Copyright 2000, Cisco Systems, Inc.
Network Management VPN, which is used to manage CE devices in scenarios where the Service Provider owns and manages CE devices. Advanced MPLS VPN Solutions Copyright 2000, Cisco Systems, Inc. Central Services Extranet Amsterdam Service provider Extranet Infrastructure Customer A VoIP GW Customer B London VoIP GW Paris Customer C VoIP GW Service Provider Network © 2000, Cisco Systems, Inc. com Page41 This diagram shows a sample Central Services extranet implementing international Voice-over-IP service.