Chapter4.Introduction to Multiprotocol Label Switching

Chapter 4. Introduction to Multiprotocol Label Switching

Multiprotocol label switching (MPLS) represents the next level of standards-based evolution in combining Layer 2 (data link layer) switching technologies with Layer 3 (network layer) routing technologies. The primary objective of this standardization process is to create a flexible networking fabric that provides increased performance and scalability. MPLS also enables advanced features such as traffic engineering capabilities, Quality of Service (QoS) and Class of Service (CoS) awareness, and facilitates the deployment of Virtual Private Networks (VPNs).

MPLS is designed to work with a wide variety of transport mechanisms; however, the initial implementations focus on leveraging ATM, IP, and Frame Relay, which are already deployed in large-scale service provider networks. This chapter highlights the details of IP + ATM-based networks and their capabilities as they apply to the deployment of MPLS and the requirements on a multiservice switch.