MultiProtocol Label Switching

configname: CONFIG_MPLS

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>MultiProtocol Label Switching
In linux kernel since version 4.1 (release Date: 2015-06-21)  
MultiProtocol Label Switching routes packets through logical
circuits. Originally conceived as a way of routing packets at
hardware speeds (before hardware was capable of routing ipv4 packets),
MPLS remains a simple way of making tunnels.

If you have not heard of MPLS you probably want to say N here.

depends
CONFIG_NET

is depended by
CONFIG_OPENVSWITCH