588 CHAPTER 49: BGP/MPLS VPN CONFIGURATION
[CE1] vlan 201
[CE1-vlan201] port gigabitethernet 2/1/1
[CE1-vlan201] quit
[CE1] interface Vlan-interface 201
[CE1-Vlan-interface201] ip address 10.1.1.1 255.255.255.0
[CE1-Vlan-interface201] ospf cost 1
# Configure OSPF.
[CE1] ospf 100 router-id 10.10.10.129
[CE1-ospf-100] import-route direct
[CE1-ospf-100] area 0.0.0.0
[CE1-ospf-100-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[CE1-ospf-100-area-0.0.0.0] network 12.1.1.0 0.0.0.255
4 Configure CE2
# Configure interface.
[CE2] vlan 202
[CE2-vlan202] port gigabitethernet 2/1/2
[CE2-vlan202] quit
[CE2] interface Vlan-interface 202
[CE2-Vlan-interface202] ip address 12.1.1.2 255.255.255.0
[CE2-Vlan-interface202] ospf cost 100
[CE2-Vlan-interface202] quit
[CE2] vlan 201
[CE2-vlan201] port gigabitethernet 2/1/1
[CE2-vlan201] quit
[CE2] interface Vlan-interface 201
[CE2-Vlan-interface201] ip address 20.1.1.1 255.255.255.0
[CE2-Vlan-interface201] ospf cost 1
# Configure OSPF.
[CE2] ospf 100 router-id 20.20.20.20
[CE2-ospf-100] area 0.0.0.0
[CE2-ospf-100-area-0.0.0.0] network 12.1.1.0 0.0.0.255
[CE2-ospf-100-area-0.0.0.0] network 20.1.1.0 0.0.0.255
Nested BGP/MPLS VPN
Configuration Example
Network requirements
A VPN user has multiple nodes to access the service provider’s BGP/MPLS
backbone network. And this VPN is divided into three sub-VPNs: VPN1, VPN2 and
VPN3.
Some of the nodes of these sub-VPNs directly access a PE in the network, and
some access a PE through the father VPN. That is, the adopted network structure
is unsymmetrical.
This example mainly describes the configuration of VPN1; the configuration of
other sub-VPNs is similar.
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