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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Dual TE Metrics

By default, MPLS TE uses the TE metrics of the links to route the TE tunnels; however, by default the TE link metrics are the same as the IGP link metrics. However, you can override this option when you set the TE metrics. You cannot have two TE metrics, though, to route TE tunnels. One solution, if you want to use two metrics, is to use the IGP metric and TE metric at the same time to route TE tunnels. Network administrators who want one metric for delay and one for bandwidth choose this option. You can use the metric reflecting the delay of the links to indicate what the best paths are for TE tunnels carrying the voice traffic, because the voice traffic needs a small overall delay. You can use the other metric reflecting the ...

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