Ericsson ECN330 Manuel d'utilisateur télécharger pdf (Page 28)

Figure 14, VPLS reference model [10]

In the figure 14, full mesh MPLS tunnels are between the provider edges

(PE). This is the basis of any virtual private network service. Inside the tun-

nels there are inner tunnels (pseudo wires) that connect the participating

PEs in the virtual private LAN service. The blue and orange customer edges

(CE) appear to be in the same LAN as long as they are using the virtual pri-

vate LAN service. [10] [11]

4.3 Edge Network

Service providers are beginning to offer next generation services such as tri-

ple play for customers and businesses. The new service consists of IPTV,

voice over IP (VoIP) and data. Because the triple play significantly increases

the bandwidth per subscriber, the network architecture is shifting from cen-

tralized model to a distributed model. In general, this means that a simple

DSL aggregation layer is evolving towards a scalable multi-gigabit Ethernet.

At the edge of the network it means that the old Broadband Remote Access

Server (BRAS) products will have to move aside to give room for new

Ethernet-centric edge routers. The starting point for building next generation

network architecture is basically the same for all service providers. The main

task in the old model was increasing access rates from dial-up speeds to the

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Ericsson ECN330 Manuel d'utilisateur Page 28