Chapter 32. MPLS
Objectives
Understand the advantages of MPLS.
Learn the components of an MPLS system.
Compare and contrast MPLS and hop-by-hop routing.
Describe the two methods of label distribution.
Explain the purpose of MPLS traffic engineering.
In a typical router-based network, Layer 3 datagrams pass from a source to a destination on a hop-by-hop basis. Transit routers evaluate each datagram's Layer 3 header and perform a routing table lookup to determine the next hop toward the destination. Although some routers implement hardware and software switching techniques (for example, Cisco Express Forwarding [CEF]) to accelerate the evaluation process by creating high-speed cache entries, these methods rely on the Layer 3 routing protocol to determine ...
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