#1  
Old 22-Jul-2009, 19:54
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Default difficult sentence
dears sir in this sentence
TCN BPDUs every Hello Time interval until it gets an acknowledgment
from its upstream neighbor.
i don't understand what is the meaning of upstream
thank you
  #2  
Old 24-Jul-2009, 14:16
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Default Re: difficult sentence
Upstream means towards (e.g., towards the root bridge); downstream means from.

See page 11 here.
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