Basic VPRN Operation
Glenn Warnock B.Sc., Mira Ghafary B.Sc., Ghassan Shaheen M.Sc. · 2015
This chapter shows how a Virtual Private Routed Network (VPRN) service provides a Layer 3 multipoint connectivity between customer sites over a provider-managed IP/MPLS core. It talks about the main components and examines the control plane and data plane operation of a VPRN. A service provider can use its IP/MPLS infrastructure to offer multiple VPRN services to different customers. Each customer's VPRN is invisible to other customers' VPRNs because the PE router maintains a separate virtual routing and forwarding (VRF) table for each VPRN service. The CE router peers with the locally connected PE router to exchange customer route information. Most service providers offer two options for AS allocation: one AS per customer or one AS per customer site. The chapter also introduces the new concepts required to support advertising customer routes within the provider core.