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Additional info for Advanced MPLS VPN Solutions (AMVS) 1.0
The connectivity categorization divides VPNs into simple VPNs (with any-to-any connectivity), overlay VPNs where a single site participates in more than one simple VPN, Central Services VPNs, where some sites have limited connectivity and Network Management VPNs, which are really only a special case of Central Services VPN. Review Questions Answer the following questions: 2-38 ■ What are the major Overlay VPN topologies ■ Why would the customers prefer partial mesh over full mesh topology? ■ What is the difference between an Intranet and an Extranet?
The Service Provider is responsible for transport of layer-2 frames between customer sites and the customer takes responsibility for all higher layers. 2-14 Advanced MPLS VPN Solutions Copyright 2000, Cisco Systems, Inc. Overlay VPN IP Tunneling Internet Protocol (IP) Generic Route Encapsulation (GRE) IP Security (IPSec) Internet Protocol (IP) VPN is implemented with IP-over-IP tunnels • Tunnels are established with GRE or IPSec • GRE is simpler (and quicker), IPSec provides authentication and security © 2000, Cisco Systems, Inc.
There are, however, a number of advanced VPN topologies with more complex connectivity requirements: 2-34 ■ Overlapping VPNs, where a site participates in more than one VPN ■ Central Services VPN, where the sites are split in two classes – server sites that can communicate with all other sites and client sites that can only communicate with the servers, but not with other clients. ■ Network Management VPN, which is used to manage CE devices in scenarios where the Service Provider owns and manages CE devices.