The strength of the Internet has been its immense scalability and adaptability to accommodate a seemingly unceasing portfolio of applications. In this tradition of adaptability, MultiProtocol Label Switching (MPLS) is the latest technique being implemented in the Internet core. MPLS provides a virtual path capability between packet (label) switches to efficiently carry differentiated services across the Internet. Additionally, MPLS has been enhanced with the capability to precisely engineer traffic tunnels to avoid congestion and more fully utilize all available bandwidth. The greatest strength of MPLS is its seamless coexistence with IP traffic and its reuse of proven IP routing protocols. The white paper provides a problem definition providing the motivation for MPLS and traffic engineering.
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