set ns [new Simulator]
source tb_compat.tcl

set node0 [$ns node]
set node1 [$ns node]
set node2 [$ns node]

tb-set-node-os $node0 FC4-STD
tb-set-node-os $node1 FC4-STD
tb-set-node-os $node2 FC4-STD

set link0 [$ns duplex-link $node0 $node1 100Mb 0ms DropTail]
set link1 [$ns duplex-link $node1 $node2 100Mb 0ms DropTail]


$ns run