Feature Description
Multiprotocol Label Switching (MPLS) is a protocol that uses labels to route packets instead of using IP addresses. UPF supports MPLS to switch MPLS traffic using VPP as the data plane forwarder. VPP encapsulates and decapsulates subscriber traffic with MPLS labels.
UPF supports MPLS encapsulation over the N9 interface for 5G deployments using VPP in this release. The N9 interface connects two UPFs. It is the interface between Intermediate I-UPF (Visited) and UPF Session Anchor (Home).
For more information, refer to the MPLS Support on UPF chapter.