mpls routing on linux

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MPLS Multiprotocol Label Switching is a routing protocol, which works in layer 2.5. It insert a lable between IP layer and protocol layer. This looks like VLAN, which works in layer 1.5 and in subnet. But MPLS works in global internet.
Enable MPLS Routing Some distribution may build mpls route as a module, so before start, please check if you have /proc/sys/net/mpls/, if not, then load the module first: