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MPLS TE autoroute basics

A few days ago I had an interesting discussion about the need for bidirectional MPLS TE tunnels when using MPLS TE forwarding adjacency. Although I’d always thought I knew how MPLS TE FA works, it took me a while to figure out all the details, so I decided to write an in-depth description of this interesting feature ... and realized after a few botched attempts it would be better to start with the fundamentals.

If you want to understand the benefits of MPLS TE FA, you need to know how MPLS TE autoroute works (and what its limitations are), so we’ll start with the MPLS TE autoroute basics.

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