Advanced MPLS VPN Solutions (AMVS) 1.0

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Managed Network Overlay VPN Implementation Service provider network Central site (hub) Remote site (spoke) Remote site (spoke) Redundant central site router Remote site (spoke) Redundant central site router Network Management Center © 2000, Cisco Systems, Inc. com Dedicated Virtual Circuits are used for network management Page43 Network management VPN is traditionally implemented in combination with overlay VPN services. Dedicated virtual circuits are deployed between any managed CE-router and the central network management router (NMS-router) to which the Network Management Station (NMS) is connected.

25 GRE Split Routing (Dedicated Router) F/R IPSec ATM MPLS VPN © 2000, Cisco Systems, Inc. com Page27 There are a number of different Virtual Networking concepts present in the data communications fields: ■ The Virtual Local Area Networks (VLAN) allow you to implement isolated LANs over the same physical infrastructure ■ Virtual Private Dialup Networks (VPDN) allow customers to use dial-in infrastructure of a Service Provider for their private dial-up connections ■ Virtual Private Networks (VPN) allow customers to use shared infrastructure of a Service Provider to implement their private networks.

GRE is fast and simple to implement and supports multiple routed protocols, but provides no security and is thus unsuitable for deployment over the Internet. An alternate tunneling technology is IPSec, which provides network layer authentication and optional encryption to make data transfer over the Internet secure. IPSec only supports the IP routed protocol. Copyright  2000, Cisco Systems, Inc. MPLS VPN Technology 2-15 Overlay VPN Layer-2 Forwarding Internet Protocol (IP) Point-to-Point Protocol (PPP) Layer-2 Transport Protocol (L2TP) Layer-2 Forwarding (L2F) Point-to-Point Tunneling (PPTP) Internet Protocol (IP) VPN is implemented with PPP-over-IP tunnels • Usually used in access environments (dial-up, DSL) © 2000, Cisco Systems, Inc.

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