[ns] MNS V2.0 - Help Me Please

[Shyam Subramanian <sshyam10@yahoo.com>]

Hi,

I am a novice to both MPLS and NS-2, i just installed
the MNS V2.0 on my Linux system, i was trying to run
thro some examples so that i can get a grasp of MNS, i
am attaching the example code and the error that i got
along with this mail. Any help is appriciated.

############## ex1.tcl code ################
#Create a simulator object
set ns [new Simulator]

#Open the nam trace file
set nf [open out.nam w]
$ns namtrace-all $nf

#Define a 'finish' procedure
proc finish {} {
        global ns nf
        $ns flush-trace
	#Close the trace file
        close $nf
	#Execute nam on the trace file
        exec ./../nam-1.0a10/nam out.nam &
        exit 0
}


# Insert your own code for topology creation
# and agent definitions, etc. here

# Node Defenition
set Node0 [$ns node]
set LSR1  [$ns mpls-node]
set LSR2  [$ns mpls-node]
set LSR3  [$ns mpls-node]
set Node4 [$ns node]

# Define links between these nodes

$ns duplex-link $Node0 $LSR1  2Mb 10ms CBQ
$ns duplex-link $LSR1  $LSR2  1Mb 10ms CBQ
$ns duplex-link $LSR2  $LSR3  1Mb 10ms CBQ
$ns duplex-link $LSR3  $Node4 1Mb 10ms CBQ

# Creating Ldp Agent on all the mpls nodes

#             setup-er-lsp{FEC ER(Explicit Route)
LSPID}

$ns at 0.1 "$LSR1 setup-er-lsp 3 1_2_3 1000"
$ns at 0.1 "$LSR1 setup-er-lsp 3 1_2_3 1100"

# setup-cr-lsp{FEC ER LSPID Bandwidth BufferSize
PacketSize Setup-prio HoldingPrio

#ns at 0.1 "$LSR1 setup-cr-lsp 3 1_2_3 1200 350K 400
200 7 3"

$ns at 1.0 "$SBT start"
$ns at 1.0 "$HBT start"
$ns at 1.0 "$RT1 start"

$ns at 10.0 "$LSR1 setup-cr-lsp 3 1_2_3 1300 450K 400
200 7 3"
$ns at 11.0 "$RT2 start"

$ns at 30.0 "$RT2 stop"
$ns at 31.0 "$LSR1 release-lsp-using-release 1300"

$ns at 40.0 "$SBT stop"
$ns at 40.0 "$HBT stop"
$ns at 40.0 "$RT1 stop"
 

#Call the finish procedure after 5 seconds simulation
time
$ns at 41.0 "finish"

#Run the simulation
$ns run

##########################End of code#############

##################The error that i got is ########

[Shyam@b348n ns-2.1b8a]$ ./ns myexample/mpls/ex1.tcl 
can't read "SBT": no such variable
    while executing
"$ns at 1.0 "$SBT start""
    (file "myexample/mpls/ex1.tcl" line 48)
[Shyam@b348n ns-2.1b8a]$ 

###############END of ERROR #######################

Thanks in advance

Shyam

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