Deploying IPv6 Networks [Electronic resources] نسخه متنی

Network Environment

EuropCom is a fictitious pan-European data and long-distance voice MPLS service provider, with POPs in France, the United Kingdom, Spain, Portugal, Italy, Germany, Belgium, Greece, Poland, the Czech Republic, Austria, and Romania. EuropCom has been providing a set of IPv4 services over the past five years to different market segments, residential customers, and businesses. Two of these IPv4 services represent the principal revenue generators: layer 3 MPLS VPN and Internet access. Both services are MPLS switched through the EuropCom integrated MPLS core backbone.

EuropCom network uses a classical architecture with three levels of POPs, as illustrated in Figure 13-1.

Level 1 (L1) POPs form the backbone of the network. They are interconnected over OC-192 and OC-48 links. L1 POPs are also Internet exchanges, connected to major European ISPs. The L1 POPs connect to level 2 (L2) POPs over OC-48 links. L2 POPs aggregate level 3 (L3) POPs over OC-48 and OC-3 links, depending of the size of the L3 POP. Figure 13-2 presents EuropCom network in a geographical context.

In the EuropCom network, Provider Edge (PE) routers are dedicated to either the Internet or layer 3 MPLS VPN access.

The EuropCom backbone has the following characteristics:

Highly secure over a dedicated private network.

Uses high-bandwidth OC-48 and OC-192 backbone links for L1-L1 POPs connectivity, OC-48 for L2-L1 POPs connectivity, and OC-48 to OC-3 for L3-L2 POPs connectivity.

MPLS-based forwarding for both VPN traffic and Internet traffic.

Is overengineered so that QoS is not needed in the core. EuropCom deploys DiffServ in the edge layer only.

Full L1 POP backbone redundancy.

Uses a single autonomous system.

Peers with major Tier 1 carriers.

EuropCom customer base covers the full range of typical ISP customers:

Small businesses EuropCom provides network access and added-value services such as Internet access and Voice over IP (VoIP).

Enterprises EuropCom offers transport, VPN, and Internet access services.

Residential EuropCom provides a variety of services such as Internet and VoIP.

Tier 2 ISP EuropCom offers Carrier Supporting Carrier (CsC) service.