CCIE SP MPLS FAQ: Provider Edge (PE) to Customer Edge (CE) Connectivity Options
Figure: PE-to-CE Connectivity Options—Sample Topology
Q1. What are the four ways in which routing information can currently be learned from a CE router?
Q2. When running a dynamic routing protocol between PE and CE, how can the PE identify which routing update belongs to which VRF?
Q3. Is it possible for multiple routing contexts of different routing processes to be associated with the same VRF?
Q4. When running OSPF PE CE, how many layers of routing hierarchy are necessary?
Q5. Is it necessary for a VPN site OSPF area 0 to be directly attached to the MPLS VPN backbone?
Q6. When running OSPF as the routing protocol between the PE routers and the C routers, are routing adjacencies formed across the MPLS VPN backbone?
Q7. How are routing loops prevented between sites when running OSPF PE CE?
Q8. Which feature is necessary to allow VPN sites to run the same autonomous system number?