Definitive MPLS Network Designs [Electronic resources] نسخه متنی

Chapter 5. Global Service Provider Design Study

Chapter 4, "National Telco Design Study") or a service provider having deployed a dense network in a particular region of the world.

Typically the profile of Globenet's customer base is medium-to-large international enterprises with sites in multiple countries and a requirement to rely on a unique service provider for their telecommunications services rather than dealing with a plethora of national and international carriers. Furthermore, for such enterprises, the cost of international leased lines is still very significant (although more affordable than a few years ago, at least in some regions). Therefore, purchasing the necessary international capacity to build a private network is typically a costly proposition, leaving aside the complexity of having to deal with a large set of regional connectivity providers.

Globenet's network is made up of a broad range of links that differ significantly in terms of speed and technology in various regions.

This chapter's objective is to discuss the current Globenet network design that illustrates an international service provider with respect to the set of objectives and network characteristics of such networks. In particular, this chapter details the following key design aspects:

Layer 3 Multiprotocol Label Switching (MPLS) virtual private network (VPN) scalability

Inter-autonomous system (AS) and interprovider operations of Layer 3 VPN and quality of service (QoS)

Virtual POP involving interprovider MPLS Traffic Engineering (TE)

Fine-grain QoS control in some parts of the core combining DiffServ and MPLS DiffServ-aware Traffic Engineering

Asynchronous Transfer Mode (ATM) pseudowire deployment for trunking of ATM infrastructure over MPLS

Introduction of IPv6 Layer 3 VPNs