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DES-7200 Configuration Guide Chapter 2 Configuring BGP IP VPN
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2.5.9 CSC: Second Carrier provides
Internet service based on IP
core
2.5.9.1 Networking requirements
A carrier owns a private network in City A, and this network has the BGP gateways to ISP A and
ISP B. This carrier utilizes its private network to provide Internet service to users in City A.
Currently, this carrier expects to expand service to City B, and therefore leases MPLS VPN
service from VPN carrier in the hope of connecting two cities via VPN, so that users in City B can
access Internet through the existing Internet gateways. The internal routes are exchanged via
IGP (OSPF), and the external routes are exchanged via BGP.
2.5.9.2 Network topology