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CiscoPress - Traffic Engineering with MPLS


Almost every busy network backbone has some congested links while others remain underutilized. That's because shortest-path routing protocols send traffic down the path that is shortest without considering other network parameters, such as utilization and traffic demands. Using Traffic Engineering (TE), network operators can redistribute packet flows to attain more uniform distribution across all links. Forcing traffic onto specific pathways allows you to get the most out of your existing network capacity while making it easier to deliver consistent service levels to customers at the same time.



Cisco(r) Multiprotocol Label Switching (MPLS) lends efficiency to very large networks, and is the most effective way to implement TE. MPLS TE routes traffic flows across the network by aligning resources required by a given flow with actual backbone capacity and topology. This constraint-based routing approach feeds the network route traffic down one or more pathways, preventing unexpected congestion and enabling recovery from link or node failures.

Traffic Engineering with MPLS provides you with information on how to use MPLS TE and associated features to maximize network bandwidth. This book focuses on real-world applications, from design scenarios to feature configurations to tools that can be used in managing and troubleshooting MPLS TE. Assuming some familiarity with basic label operations, this guide focuses mainly on the operational aspects of MPLS TE-how the various pieces work and how to configure and troubleshoot them. Additionally, this book addresses design and scalability issues along with extensive deployment tips to help you roll out MPLS TE on your own network.

  • Understand the background of TE and MPLS, and brush up on MPLS forwarding basics

  • Learn about router information distribution and how to bring up MPLS TE tunnels in a network

  • Understand MPLS TE's Constrained Shortest Path First (CSPF) and mechanisms you can use to influence CSPF's path calculation

  • Use the Resource Reservation Protocol (RSVP) to implement Label-Switched Path setup

  • Use various mechanisms to forward traffic down a tunnel

  • Integrate MPLS into the IP quality of service (QoS) spectrum of services

  • Utilize Fast Reroute (FRR) to mitigate packet loss associated with link and node failures

  • Understand Simple Network Management Protocol (SNMP)-based measurement and accounting services that are available for MPLS

  • Evaluate design scenarios for scalable MPLS TE deployments

  • Manage MPLS TE networks by examining common configuration mistakes and utilizing tools for troubleshooting MPLS TE problems


"Eric and Ajay work in the development group at Cisco that built Traffic Engineering. They are among those with the greatest hands-on experience with this application. This book is the product of their experience."

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