I need help, pls help me...

All experts here, I’m undergraduate student and now I prepare for my thesis. My thesis title is MPLS over Optical Network. I need to come out a simulation and design the network that i implement. However, the problem i face is I dunnoe which simulator to download. I hope the simulator is a freeware and it can provide a good help file and correct manual. Besides that, I hope the simulator can function as add and drop because it can make my work easier and easy for me to learn. So, I hope all experts here can give me some comments and i will appreciate all the comments you all give me. Thanks very much, all experts here. :smiley:

Sorry, besides that…i hope the simulator can let me add bandwith, buffer, throughput and so on…thanx very much