Infrastructure Migration Review Questions n How can you minimize the effect of core migration to MPLS for regular IP traffic?. n What are the benefits of edge-first migration toward
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MPLS VPN Migration Strategies
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Infrastructure Migration
Review Questions
n How can you minimize the effect of core migration to MPLS for regular IP traffic?
Use conditional label advertising
n Can you allocate labels only to PE loopback addresses if you are using an ATM core?
Yes, with conditional label advertising
n What are the benefits of edge-first migration toward MPLS infrastructure?
It is easier and quicker to implement
It enables clear separation of migration issues
It does not involve any IP reconfiguration of core devices in the network
n What are the drawbacks of edge-first migration toward MPLS infrastructure?
When implemented with the GRE tunnels it suffers from encapsulation overhead
It has severe scalability constraints
It requires point-to-point links between islands of MPLS connectivity
n Which migration strategy is better suited for early MPLS VPN pilots?
The Migration from Edge strategy
n Which migration strategy is better for a large-scale MPLS VPN rollout?
The Migration from Core strategy
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Customer Migration to MPLS VPN service
Review Questions
n What are the steps in overlay VPN customer migration toward MPLS VPN?
Remove the link to the overlay VPN after the last site has been migrated
Select one site to act as a central transit site during migration process Migrate other sites step by step Let the IGP take care of the changes in the VPN
Connect the central site through a new virtual circuit or physical interface to the MPLS/VPN backbone and deploy the target PE-CE routing protocol
n What are the necessary steps in layer-3 VPN customer migration toward MPLS VPN?
Announce the tunnel endpoints into the MPLS/VPN backbone
Select a site (or a few sites) to act as a transit point between the old and the new VPN backbone
For every other site, establish connectivity with the new VPN backbone, test routing information exchange and then disable connectivity (GRE tunnels)with the old backbone
When Frame Relay is used only in transition, revert to original encapsulation on the transit site, and put the interface into the new VRF Connect the transit site to the new MPLS/VPN backbone via a
dedicated link (or Frame Relay subinterface) and start PE-CE routing protocol
n Which protocol should you use as the PE-CE routing protocol when migrating customers are using EIGRP as their VPN routing protocol?
BGP