Re: [ns] Problems with LAN

[Tarik Alj <aljtarik@ozias.inrs-telecom.uquebec.ca>]

> I made a small tcl file with two nodes to check the LAN simulation.
> 
> the file is:
> tmp.tcl:
> 
> 
> #Create a simulator object
> set ns [new Simulator]
>                  
> 
> set f [open trace.1 w]
> $ns trace-all  $f
> 
> 
> proc finish {} {
>                  global ns f
>                  close $f
>                 }
> 
> 
> 
> #Create two nodes
> 
> 
> set n0 [$ns node]
> set n1 [$ns node]
> 
> #Create a duplex link between the nodes
> #$ns duplex-link $n0 $n1 1Mb 10ms DropTail
> set lan[$ns make-lan "$n0 $n1" 1Mb 10ms LL Queue/DropTail Mac/Csma/Cd]
> 
> #Call the finish procedure after 5 seconds of simulation time
> $ns at 5.0 "finish"
> 
> 
> #Run the simulation
> $ns run
> 
> 
> 
> I am getting compilation problems:
> 
> 
> _o14: unable to dispatch method init-vars
>     while executing
> "_o14 init-vars -bw 1Mb -delay 10ms -llType LL -ifqType Queue/DropTail
> -macType Mac/Csma/Cd -chanType Channel"
>     ("eval" body line 1)
>     invoked from within
> "eval $self init-vars $args"
>     (procedure "_o14" line 2)
>     (LanNode init line 2)
>     invoked from within
> "_o14 init _o3 -bw 1Mb -delay 10ms -llType LL -ifqType Queue/DropTail
> -macType Mac/Csma/Cd -chanType Channel"
>     (Class create line 1)
>     invoked from within
> "LanNode create _o14 _o3 -bw 1Mb -delay 10ms -llType LL -ifqType
> Queue/DropTail -macType Mac/Csma/Cd -chanType Channel"
>     invoked from within
> "catch "$className create $o $args" msg"
>     (procedure "new" line 3)
>     invoked from within
> "new LanNode $self  -bw $bw  -delay $delay  -llType $llType  -ifqType
> $ifqType  -macType $macType  -chanType $chanType"
>     (procedure "_o3" line 2)
>     (Simulator make-lan line 2)
>     invoked from within
> "$ns make-lan "$n0 $n1" 1Mb 10ms LL Queue/DropTail Mac/Csma/Cd"
>     (file "tmp.tcl" line 25)
> 
> Even simple simulation is not able to run.
> Will very much thankful if get the solution.
> 
> seema.
> 
Mac/Csma/Cd is not working. But you should be getting an error message instead 
of all the "garbage". What version of ns are you running? I have also noticed a 
typo, there should be a spacing between lan and [ : lan[$ns make-lan "$n0 $n1" 
1Mb 10ms LL Queue/DropTail Mac/Csma/Cd].

Tarik.