Bug in simplex-link?

[Sara Trabucchi <trabucch@cefriel.it>]

Hi,
After creating a simplex-link I can't obtain a reference to the handle
for the queue . These are  the commands I gave:
set lnk  [$ns simplex-link $n1 $n2 1.5Mb 10 ms DropTail]
puts [$lnk queue]

I received  "Invalid command name".  On the contrary if I write:

set lnk  [$ns duplex-link $n1 $n2 1.5Mb 10 ms DropTail]
puts [$lnk queue]

It' OK.
 Am I doing something wrong, or is there a bug in simplex-link ?
Could anybody help me?
Thanks in advance
                                                   Sara