You have multiple MPLS LSP domains that you want to internetwork. Your provider's backbone is IP. How to internetwork without disrupting the outlying MPLS domains or the provider?
A) have MP-BGP exchange labeled routes between the MPLS domains and the provider
B) have MPLS LSPs utilize GRE tunnels
C) use MPLS Traffic Engineering across the multiple MPLS domains and the core
D) have each PE receive IP packets, add an MPLS header, and forward them to the next PE in the LSP

Question

Quizplus · Accepted Answer

Using GRE tunnels allows MPLS LSPs to be encapsulated over an IP backbone without disrupting the existing MPLS domains or the provider's IP network.

You Have Multiple MPLS LSP Domains That You Want to Internetwork