Case Study 7: Implementing Hub and Spoke Topologies with OSPF

When a hub and spoke design needs to be deployed using a MPLS VPN, a single CE router functions as the hub router with other CE routers connecting to the hub site over the SP MPLS infrastructure. Figure 14-43 shows a SP network implementing hub and spoke using OSPF for Customer A sites.

Figure 14-43. Case Study 7: Hub and Spoke with OSPF Topology
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In the network illustrated in Figure 14-43, CE1-A is configured using OSPF PE-CE connectivity to PE1-AS1 and functions as the hub-site CE router for Customer A. CE Routers CE2-A, CE3-A, and CE4-A function as spoke CE ...

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