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Figure 55 Scenario where the Level 2 carrier is an MPLS L3VPN service provider
NOTE:
As a best practice, establish equal cost LSPs between the Level 1 carrier and the Level 2 carrier if
equal cost routes exist between them.
228BNested VPN
The nested VPN technology exchanges VPNv4 routes between PEs and CEs of the ISP MPLS
L3VPN and allows a customer to manage its own internal VPNs.
771HFigure 56 shows a nested VPN
network. On the service provider's MPLS VPN network, there is a customer VPN named VPN A. The
customer VPN contains two sub-VPNs, VPN A-1 and VPN A-2.
The service provider PEs consider the customer's network as a common VPN user and do not join
any sub-VPNs. The service provider CE devices (CE 1 and CE 2) exchange VPNv4 routes including
sub-VPN routing information with the service provider PEs, which implements the propagation of the
sub-VPN routing information throughout the customer network.
The nested VPN technology supports both symmetric networking and asymmetric networking. Sites
of the same VPN can have the same number or different numbers of internal VPNs. Nested VPN
also supports multiple-level nesting of internal VPNs.
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