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Central Services Extranet—Hybrid<br />
(Overlay + P2P) Implementation<br />
Implementation<br />
Amsterdam<br />
London<br />
Paris<br />
VoIP GW<br />
VoIP GW<br />
VoIP GW<br />
Service Provider Network<br />
Service provider<br />
Extranet Infrastructure<br />
Provider Edge<br />
Router<br />
Provider Edge<br />
Router<br />
Provider Edge<br />
Router<br />
Provider Edge<br />
Router<br />
Provider Edge<br />
Router<br />
Frame Relay Virtual Circuit<br />
Frame<br />
Relay<br />
Infrastructure<br />
Frame Relay<br />
Edge switch<br />
Frame Relay<br />
Edge switch<br />
Frame Relay<br />
Edge switch<br />
Customer A<br />
Customer B<br />
Customer C<br />
© 2002, Cisco Systems, Inc. www.cisco.com <strong>MPLS</strong> v2.1-42<br />
The network diagram shown above describes an interesting scenario where peerto-peer<br />
<strong>VPN</strong> and overlay <strong>VPN</strong> implementation can be used to provide end-to-end<br />
service to the customer.<br />
The VoIP service is implemented with Central Services extranet topology, which<br />
is in turn implemented with peer-to-peer <strong>VPN</strong>. The connectivity between PErouters<br />
in the peer-to-peer <strong>VPN</strong> and the customer routers is implemented with an<br />
overlay <strong>VPN</strong> based on Frame Relay. The PE-router of the peer-to-peer <strong>VPN</strong> and<br />
the CE-routers act as CE-devices of the Frame Relay network.<br />
Copyright © 2002, Cisco Systems, Inc. <strong>MPLS</strong> <strong>VPN</strong> <strong>Technology</strong> 49
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