執行tcl檔 --> ns simpleDumbbell.tcl ns:myTrace file3: can't read 'dctcp_alpha_ ': no such variable while executing 'subst $[subst $var]' (procedure '_o154' line5) (object next line 5) invoked from within '_o154 next dctcp_alpha_' ('eval' body line 1) invoked from within 'eval $self next $args' (procedure '_o154' line18) (Agent set line 18) invoked from within '$tcp($i) set dctcp_alpha_'
(procedure 'myTrace' line8) invoked from within 'myTrace file3' _____________________________________________
