This one is subtle. Reoptimization is the recalculation of a path from the head to the tail. What about that calculation is missing in multiarea TE?

Break the problem into pieces. Clearly, from the headend's perspective, two places that reoptimization could happen are

• Within the headend's area

• Outside the headend's area

Reoptimization within the headend's area happens normally. Only reoptimization outside the headend's area is different.

In Figure 4-42, an LSP goes from Router A to Router L.

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