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PE 1 and PE 2 are PE devices on the service provider backbone. Both of them support the nested
VPN function.
CE 1 and CE 2 are connected to the service provider backbone. Both of them support VPNv4
routes.
PE 3 and PE 4 are PE devices of the customer VPN. Both of them support MPLS L3VPN.
CE 3 through CE 6 are CE devices of the sub-VPNs for the customer VPN.
The key of nested VPN configuration is to understand the processing of routes of sub-VPNs on the service
provider PEs, which is described as follows:
When receiving a VPNv4 route from a CE (CE 1 or CE 2 in this example), a service provider PE
replaces the RD of the VPNv4 route with the RD of the MPLS VPN on the service provider network
where the CE resides, adds the export target attribute of the MPLS VPN on the service provider
network to the extended community attribute list, and then forwards the VPNv4 route as usual.
To implement exchange of sub-VPN routes between customer PEs and service provider PEs,
MP-EBGP peers must be established between service provider PEs and customer CEs.
Figure 38 Network diagram
Device
Interface
CE 1
Loop0
Vlan-int12
Vlan-int11
CE 3
Vlan-int11
CE 5
Vlan-int13
PE 1
Loop0
Vlan-int11
Vlan-int12
PE 3
Loop0
Vlan-int11
Vlan-int12
Vlan-int13
IP address
Device
2.2.2.9/32
CE 2
10.1.1.2/24
11.1.1.1/24
100.1.1.1/24
CE 4
110.1.1.1/24
CE 6
3.3.3.9/32
PE 2
11.1.1.2/24
30.1.1.1/24
1.1.1.9/32
PE 4
100.1.1.2/24
10.1.1.1/24
110.1.1.2/24
319
Interface
IP address
Loop0
5.5.5.9/32
Vlan-int11
21.1.1.2/24
Vlan-int12
20.1.1.1/24
Vlan-int11
120.1.1.1/24
Vlan-int13
130.1.1.1/24
Loop0
4.4.4.9/32
Vlan-int11
21.1.1.1/24
Vlan-int12
30.1.1.2/24
Loop0
6.6.6.9/32
Vlan-int11
120.1.1.2/24
Vlan-int12
20.1.1.2/24
Vlan-int13
130.1.1.2/24

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