1. A method of processing a packet in a multi-protocol label switching-transport profile (MPLS-TP) network, comprising: classifying an input packet, and extracting or generating at least a packet transport layer (PTL) index through a lookup according to the classification result; performing a lookup for determining a next hop using the extracted or generated PTL index, and acquiring service-specific lookup results; and processing the packet according to the acquired service-specific lookup results, and transmitting the packet through a label switched path (LSP).