MPLS has become an indispensable technology in data network field, and it provides the connection-oriented second layer transmission mode through the third layer network. Such seemingly simple mechanism is very powerful in function and basically changed data network industry. Though network professionals can obtain concepts and protocol information related with MPLS from plenty of resources, they still lack systematic presentation as to how to design MPLS network by specific environment to fully use the advantages of MPLS, for which, this book is edited.