Case Study

The network topology shown in Figure 8-12 represents Drolrevo Enterprises WAN architecture.

Figure 8-12. Drolrevo Enterprises WAN

The Drolrevo customer sites serviced are being migrated from Network Service Provider #1 (NSP#1) to Network Service Provider #2 (NSP#2). The customer router is configured with two serial interfaces, each interconnected with a respective network service provider; NSP#1 and NSP#2. Drolrevo Enterprises has implemented an NNI at their main site so that their remote sites, interconnected to either NSP#1 or NSP#2, can communicate with each other through the headquarters site.

NOTE

Routing tables provide the routing information to the headquarters and remote sites so that each site knows how to reach its intended destination.

Drolrevo Enterprises has sites in very remote parts of the world where there is no direct access to their new network service provider. However, NSP#2 does have a NNI agreement with NSP#3 that services these remote locations. It is through this service provider NNI that Drolrevo Enterprises can establish communication with these remote sites.