Which of the following about VPN labels is FALSE?

In an MPLS VPN, a two-level label stack is used. The outer label (transport label) is used to forward the packet across the provider's core network from the ingress PE to the egress PE. This outer label is swapped at each P router. The inner label (VPN or service label) is used by the egress PE to identify the specific VPN (e.g., VPRN) to which the packet belongs. P routers are unaware of the service context and do not inspect or swap the inner VPN label; it remains unchanged as the packet traverses the core network.

A. For VPRN services, MP-BGP is the protocol used to advertise VPN-IPv4 prefixes and their corresponding VPN labels between PE routers.
C. The VPN label is positioned inside the transport label in the MPLS stack, so it is called the "inner label." It identifies the service, so it is also called the "service label."
D. Upon receiving the packet, the egress PE removes the transport label and uses the exposed VPN label to direct the packet to the correct VPRN instance (VRF).

1. Nokia 7750 SR OS MPLS Guide, Release 21.10.R1, "MPLS Label Stack," Section: "Label Operations." (This section describes how P routers operate only on the top label, while PE routers operate on the full label stack).

2. Rosen, E., & Rekhter, Y. (2006). BGP/MPLS IP Virtual Private Networks (VPNs). RFC 4364. Section 4. (This foundational RFC explains that P routers switch packets based on the top label only and that the VPN label is used by the egress PE to identify the VRF).

3. Nokia 7750 SR OS Services Architecture Guide, Release 21.10.R1, "VPRN Service Overview," Section: "VPRN Packet Walkthrough." (This section details the encapsulation process, showing the inner VPN label and outer transport label, and explains the role of each at P and PE routers).