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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
2-41
DES-7200(config-router-af)# exit
DES-7200(config-router)# address-family vpnv4
DES-7200(config-router-af)# neighbor 30.30.30.2 activate
DES-7200(config-router-af)# neighbor 30.30.30.2 next-hop-unchanged
DES-7200(config-router-af)# end
2.3.3 Configure Carrier's Carrier
(CSC)
In a basic MPLS VPN, each site is a traditional IP network with simple network structure.
However, in there are some special VPN users. For example, the VPN user itself is also a
service provider who leases the VPN service of MPLS VPN service provider and then provides
specific services for users. In such a case, the MPLS VPN service provider is called Provider
Carrier or First Carrier, while the VPN user who is also a service provider is called Customer
Carrier or Second Carrier. This networking model is called Carrier's Carrier (CSC).
Fig 12 Model of Carrier's Carrier
2.3.3.1 Basic concepts
First Carrier
First Carrier is also called Provider Carrier, who provides MPLS VPN services for Second
Carriers. In order to support Second Carriers to provide services for their users, the PE device of
First Carrier must support CSC. The First Carrier PE providing services for Second Carriers is
also called CSC-PE.
Second Carrier
Second Carrier is also called Customer Carrier, who leases the MPLS L3VPN service from First
Carrier in order to build its own internal network and then provide services for users. The Second
Carrier CE connecting to the First Carrier is also called CSC-CE.