1. A method comprising: determining, by a routing device of a label switched path (LSP) for a packet, encapsulated by a label stack including an entropy label, whether a downstream routing device of the LSP supports entropy labels, wherein the downstream routing device is a routing device other than an egress routing device of the LSP; when the downstream routing device does not support entropy labels: removing the entropy label from the label stack of the packet; and forwarding the packet, from which the entropy label has been removed, along LSP; and when the downstream routing device supports entropy labels, forwarding the packet, including the entropy label, along the LSP.