Multiple inputs Single output Router

[Frank Chu <frankchu_ns@yahoo.com>]

Am I correct in the following understandings ?

1. Queueing displine can only be implemented in
"link"s which simulate output queues

2. If a multiple inputs (say, 2 inputs) and single
output router, I will have to use this:

  n1---->Link1----\
                  n3--->Link3--->
  n2---->Link2----/

 Then packets from Link 1 and 2 will arrive in
classifier of n3 first and then be aggregated into
Link3's buffer.  But, how does NS do the aggregation ?
 First come first in ?

 If two packets arrive at the same time (simulation
time), which one will enter the Link3 ? Is it possible
to have unfair situation that packets from one link
enter a lot while the other seldom have chances ?

  Thanks,

Frank
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