A parks department traces a civic packet between PE and P routers and sees multiple MPLS labels. What do those stacked labels typically represent?
Select an answer to reveal the explanation.
Short Explanation
Two stickers on the same envelope: the outer one gets the packet across the county core LSP, and the inner one tells the far PE which VRF it belongs to. That’s the classic transport-plus-VPN label stack—not AS-path tattooed on the wire.
Full Explanation
In MPLS L3VPN forwarding, packets commonly carry an outer transport (IGP/LDP or SR) label that switches the LSP across P routers and an inner VPN label that identifies the target VRF at the egress PE. P routers typically forward on the outer label only. The stack is not a MAC rewrite copy, pure QoS marking, or an encoding of BGP AS-path segments.