Chapter 4. IP Routing with IPMPLS VPNs

Chapter 4. IP Routing with IP/MPLS VPNs

This chapter covers the following topics:

• Introduction to Routing for the Enterprise MPLS VPN

• Network Topology

• Addressing and Route Summarization

• Site Typifying WAN Access: Impact on Topology

• Site Typifications and Connectivity Standards Routing Between the Enterprise and the Service Provider

• Case Study: BGP and EIGRP Deployment in Acme, Inc.

This chapter's objectives are to define the options and technical implementations for the various routing mechanisms available to enterprises for typical IP virtual private network (VPN) deployments. Routing is the cornerstone of every IP network. Without a properly designed IP routing schema, a network is in danger of suffering from severe stability and scaling issues.

In this chapter, you will learn about the requirements for supporting the converged world of Multiprotocol Label Switching (MPLS) VPNs and how they influence the addressing and routing policies applicable in the enterprise. The aim is to provide a deployable approach that the enterprise can use as a guideline, as well as to show you how to address these policies to the service provider. Specifically, Acme, Inc.'s foundation routing and addressing needs are covered in the case study section.

This chapter introduces the concept of routing between the customer edge (CE) and the provider edge (PE). To assist with this, we will use Acme's intranet WAN as the proof point for the basis of the MPLS VPN service.