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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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Hierarchical VPNs: Carrier's Carrier MPLS VPNs

In some cases, the customer of the Carrier MPLS VPN backbone network might also want to provide MPLS VPN services to its own customers. This type of connectivity is referred to as hierarchical VPNs, with multiple levels of VPNv4 label allocation.

Figure 6-10 shows that InterCom is now providing MPLS VPN services to GamesNet and SoccerOnline, and they have connectivity within their own extranet.

Figure 6-10. MPLS VPN Extranet Between GamesNet and SoccerOnline

As you can see in Figure 6-10, the InterCom GamesNet and SoccerOnline edge routers now provide MPLS VPN PE router functionality to GamesNet and ...

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