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Advanced MPLS VPN Solutions (AMVS) 1.0

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Large networks usually deploy a layered combination of these technologies, for example: 2-26 ■ Partial mesh in the network core ■ Redundant hub-and-spoke for larger branch offices (spokes) connected to distribution routers (hubs) ■ Simple hub-and-spoke for non-critical remote locations (for example, home offices). Advanced MPLS VPN Solutions Copyright  2000, Cisco Systems, Inc. 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 Page25 Each VPN paradigm also has a number of drawbacks: ■ Overlay VPNs require a full mesh of virtual circuit between customer sites to provide optimum inter-site routing ■ All the virtual circuits between customer sites in an overlay VPN have to be provisioned manually and the bandwidth must be provisioned on a site-to-site basis (which is not always easy to achieve). ■ The IP-based overlay VPN implementations (with IPSEC or GRE) also incur high encapsulation overhead (ranging from 20 to 80 bytes per transported datagram).

The overall network implemented with a VPN solution is divided into the Customer network (C-network), which is exclusively under customer’s control and the Provider network (P-network), the shared infrastructure used to offer the VPN services. A contiguous part of the C-network is called a customer site. The device linking a customer site with the P-network is called Customer Edge (CE) device. Most commonly this is a router, called CE-router. This component was traditionally named Customer Premises Equipment (CPE).

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