CCIE SP MPLS FAQ: Frame-mode MPLS Operation Figure: SuperNet Service Provider Network Q1. MPLS can function using two different modes. What are they? Answer: Frame-mode—Labeled packets are exchanged as frames at Layer 2 Q2. When using frame-mode MPLS, where is the label header carried within the frame? Answer: The label header is inserted between the Layer-2 and … [Read more...]