Referring to the question below from the link above :
Q. Is R3 a "Downstream" LSR to R4 for 10.1.1.0/24?
A. No, data flows from upstream to downstream.
When I read the answer above, I felt there is a typo (any comment) , since the traffic flows from R4 through R3 to reach its final destination 10.1.1.0/24 , hence R3 downstream router to R4, because data flows from upstream (R4) to downstream (R3) to reach its network destination (10.1.1.0/24).
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