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Extra resources for Advanced MPLS VPN Solutions (AMVS) 1.0
The Service Provider allocates portions of its address space to the customers and manages the packet filters on the PE-routers to ensure full Reachability between sites of a single customer and isolation between customers. 2-18 Advanced MPLS VPN Solutions Copyright 2000, Cisco Systems, Inc. Peer-to-Peer VPN with Controlled Route Distribution Customer A Site #1 Service provider network Point-of-Presence Customer A Site #2 The P-router contains all customer routes Uplink PE-router Customer-A P-router PE-router Customer-B Customer B Site #1 Each customer has a dedicated PE router that only carries its routes Customer isolation is achieved through lack of routing information on PE router © 2000, Cisco Systems, Inc.
Overlay and Peer-to-Peer VPN Objectives Upon completion of this section, you will be able to perform the following tasks: ■ Describe the differences between overlay and peer-to-peer VPN ■ Describe the benefits and drawbacks of each VPN implementation option ■ List major technologies supporting overlay VPNs ■ Describe traditional peer-to-peer VPN implementation options Copyright 2000, Cisco Systems, Inc. MPLS VPN Technology 2-9 VPN Implementation Technologies VPN services can be offered based on two major paradigms: • Overlay Virtual Private Networks where the Service Provider provides virtual point-topoint links between customer sites • Peer-to-Peer Virtual Private Networks where the Service Provider participates in the customer routing © 2000, Cisco Systems, Inc.
The Service Provider needs detailed IP routing knowledge, which is not readily available in traditional Service Provider teams. Copyright 2000, Cisco Systems, Inc. MPLS VPN Technology 2-21 Drawbacks of Traditional Peerto-Peer VPNs Shared PE router Dedicated PE router • All customers share the same (provider-assigned or public) address space • All customers share the same address space • High maintenance costs associated with packet filters • Each customer requires a dedicated router at each POP • Lower performance— each packet has to pass a packet filter © 2000, Cisco Systems, Inc.
Advanced MPLS VPN Solutions (AMVS) 1.0