Event: NANOG 33, February 2005, Las Vegas
Author(s): Martin Horneffer, T-Com
Much has been said about traffic engineering with explicit routing vs. tuning of IGP metrics. After a thorough analysis of alternatives, including a full mesh of static and/or dynamic RSVP-based tunnels, T-Com (AS3320) has decided to use the IGP metric-based approach of traffic engineering for its global IP/MPLS-based network. We show how we get the traffic matrix with a home-grown algorithm based on MPLS counters or “LDP statistics,” thus avoiding the need for a full mesh of tunnels just to do the measurements. We also show how we represent the real network in a suitable way for simulation and optimization tools. Last but not least, we discuss some general design issues concerning the IGP metric design. General requirements for IGP metrics in the context of traffic engineering might easily contradict requirements for iBGP route reflection (see “BGP Persistent Route Oscillation Condition,” RFC3345.)
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