MPLS-Enabled Applications: Emerging Developments and New Technologies

8.13. STUDY QUESTIONS

1. Discuss some of the BGP properties that make it a desirable PE-CE routing protocol from the service provider's point of view. Give examples of how these properties can be used.

2. Describe what happens when a transport LSP goes down in the core, when a dynamic routing protocol is used between the provider and the customer. How is the interaction different in the case of multi-homing? To avoid a route flap towards the customer, what are the requirements on the PE device?

3. Differentiated VPN treatment in the core can be achieved by either using different next-hops for the different services or by having policies matching on LSP names. What requirements does the next-hop solution impose on the deployment?

4. Describe some of the advantages of using Route Reflectors in L3VPN deployments.

5. Discuss the advantages of route target filtering versus partitioning of prefixes to RRs from a point of view of network growth.

6. Revisit the network in Section 8.5.2.1 and evaluate the CPU load on the PEs if instead of an RR deployment a full mesh of BGP sessions was deployed. What is the impact of a busy CPU on PE on the rest of the PEs in the network, and on the convergence time.

7. Provide one deployment example where route-target filtering provides an advantage and one where it does not.

8. Discuss how MPLS Diffserv can be coupled with flexible resolution of VPN routes over a restricted set of LSPs to provide QoS for a VPN setup.

9. Describe some of the drivers behind IPv6 L3VPNs.

10. Suppose a service ...