[ns] ques. about mns routing

["Jonathan Hicks" <jdh2j@hotmail.com>]

Using the MPLS simulator, when I make an explicit route the command looks 
like:
$ns at 1.5 "$LSR2 make-explicit-route 7 2_3_4_8_7 3600 -1"

Can anyone tell me what the 3600 or the -1 do?  I have no idea.  Also, does 
the first 7 just indicate the last node in the explicitly stated path?
thanks,
Jonathan

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