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Robert Ricci authored
Think I got it this time (yeah, I've said that four times before). It requires some extra bookkeeping; we were recording source and dest interface names in tb_plink, but not source and dest node names. With this new information, find_best_link() now has sole responsibility for figuring out if the vlink and plink go in the same direction, and the callers of find_best_link() are now responsible for knowing which direction they are traversing the vlink in (and thus whether they should tell find_best_link() to check the source or dest of the vlink.)
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