Interprovider and Carrier-of-Carriers VPNs Overview

This chapter describes in detail the operation of interprovider and carrier-of-carriers virtual private networks (VPNs) as described in RFC 2547bis, BGP/MPLS VPNs. As VPNs are deployed on the Internet, the customer of a VPN service provider might be another service provider rather than an end customer. The customer service provider depends on the VPN service provider to deliver a VPN transport service between the customer service provider’s points of presence (POPs) or regional networks.

If the customer service provider’s sites have different autonomous system (AS) numbers, then the VPN transit service provider supports carrier-of-carrier VPN service for the interprovider VPN service. If the customer service provider’s sites have the same AS number, then the VPN transit service provider delivers a carrier-of-carriers VPN service.

This chapter discusses the following topics, which provide background information about carrier-of-carriers VPNs:

• Interprovider and Carrier-of-Carriers VPN Standards
• Traditional VPNs, Interprovider VPNs, and Carrier-of-Carriers VPNs
• Interprovider VPNs
• Carrier-of-Carriers VPNs

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