Recently I have read the source code of the up*/down* routing algorithm. It seems that this algorithm only updates the hops[lid_no][port], does not update the lft (linear forward tables). So , how does the switch forward the packet ? Does the switch look up the hops[lid_no][port] to forward the packet? Another problem is that there are two arrays , lft and new_lft. I don't know the difference between these two tables, can anyone tell me ?
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