Networks-on-chips (NoC) have been introduced as a remedy for the growing problems of current interconnection VLSI chips. Being a relatively new domain in research, simulation tools for NoC are scarce. To fill the gap, we use network simulator NS-2 for simulating multi protocol label switching in NoC, especially at high level chip design. The huge library of network elements with its flexibility to accommodate customized designs like (ASIC), caused to network simulator 2 (NS-2) becomes a viable choice for NoC. We also carry out the NS-2 to simulate MPLS resource reservation mechanism and types of services in NOC.