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Chapter 3.12. QoS Provisioning Framework... > REFERENCE MODEL OF PE-BASED L3 IP VP...

REFERENCE MODEL OF PE-BASED L3 IP VPNS

In PE-based L3 IP VPNs, all network routers are capable of forwarding VPN traffic to appropriate destinations, that is the customer and provider need to cooperate at the routing layer. Reference model of PE-based L3 IP VPNs is presented in Figure 1 (Callon & Suzuki, 2005).

The backbone of provider's network consists of a single or multiple cooperating domains, relying on the IP/MPLS technology. A set of P (P— provider core) routers corresponds to core IP/MPLS routers, which are transparent to VPN services. Aset of PE (PE— provider edge) routers corresponds to network edge routers and implements VPN functionality by means of a set of VPN forwarding instances (VFIs). VFI entities implemented in different PE routers of the single provider's network are mutually interconnected by means of VPN tunnels. VPN tunnel is a logical connection which is created by encapsulating each IP packet at the ingress PE router, that is by adding a proper header in such way that the encapsulated traffic is forwarded through network based on the destination address, and optionally other fields in that header. Depending on the VPN architecture, the VFI concept may be implemented as a virtual router or VPN routing and forwarding (Andersson & Madsen, 2005; Carugi & De Clercq, 2004).


  

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