Re: [ns] Re: your mail

["Jun Zhao" <JZhao_NS@hotmail.com>]

Sometimes the "-channel "option in node-config will generate errors.
Try -channeltype instead. It will genearate warnings, but not error!:)
----- Original Message -----
From: "kunchanl" <kunchanl@pollux.usc.edu>
To: "Raj M Verma" <mvrsv@yahoo.com>
Cc: "users ns" <ns-users@ISI.EDU>
Sent: Tuesday, August 28, 2001 9:26 AM
Subject: [ns] Re: your mail


> Maybe you can use Manual routing to set
> n4-n7 as your preferred route?
>
> Kun-chan Lan
>
> On Fri, 24 Aug 2001, Raj M Verma wrote:
>
> > Hello ns users, I'm trying to run a simulation with
> > simple topology having 8 nodes where every node is
> > connected to every other node. I've made n7 as the
> > destination node where it receicves packets from n0 to
> > n6. all the links except n4-n7 are having 1Mb capacity
> > to send the data. the link n4-n7 is having a capacity
> > of 2Mb to send the data. I'm breaking the link between
> > and n2-n7 at a point of time expecting that the
> > traffic from n2 shud flow via n4 'cos it's having more
> > capacity comparitively with other links. But the
> > packets are flowing via n2-n6-n7 and some packets are
> > getting discarded 'cos the link between n6-n7 is
> > capable of handling only 1Mb of data. shud I add any
> > other procedures to make the routers to select the
> > optimal route? thanx in advance.
> > Raj.
> >
> > My code is as follows.
> >
> > set ns [new Simulator -multicast on]
> > $ns rtproto DV
> > $ns color 0 Blue
> > $ns color 1 Red
> > $ns color 2 Green
> > $ns color 3 Orange
> > $ns color 4 Yellow
> > $ns color 5 Brown
> > $ns color 6 Purple
> > set nf [open out.nam w]
> > $ns namtrace-all $nf
> >
> > proc finish {} {
> >     global ns nf
> >     $ns flush-trace
> >     close $nf
> >     exec nam out.nam &
> >     exit 0
> > }
> >
> > set numNode 8
> >
> > for {set i 0} {$i < $numNode} {incr i} {
> >     set n($i) [$ns node]
> > }
> >
> > $ns duplex-link $n(4) $n(7) 2Mb 10ms SFQ
> >
> > for {set i 0} {$i < 7} {incr i} {
> >     for {set j [expr ($i + 1)]} {$j < $numNode} {incr
> > j} {
> > $ns duplex-link $n($i) $n($j) 1Mb 10ms SFQ
> >     }
> > }
> >
> > $ns duplex-link $n(4) $n(7) 2Mb 10ms SFQ
> >
> > for {set i 0} {$i < 7} {incr i} {
> >     set udp($i) [new Agent/UDP]
> >     $ns attach-agent $n($i) $udp($i)
> >     $udp($i) set class_ $i
> > }
> >
> > for {set i 0} {$i < 7} {incr i} {
> >     set cbr($i) [new Application/Traffic/CBR]
> >     $cbr($i) set packetSize_  500b
> >     $cbr($i) set interval_ 0.005
> >     $cbr($i) attach-agent $udp($i)
> > }
> >
> > set null0 [new Agent/Null]
> > $ns attach-agent $n(7) $null0
> >
> > for {set i 0} {$i < 7} {incr i} {
> >     $ns connect $udp($i) $null0
> > }
> >
> > $ns at 0.2 "$cbr(0) start"
> > $ns at 0.4 "$cbr(1) start"
> > $ns at 0.6 "$cbr(2) start"
> > $ns at 0.8 "$cbr(3) start"
> > $ns at 1.0 "$cbr(4) start"
> > $ns at 1.2 "$cbr(5) start"
> > $ns at 1.4 "$cbr(6) start"
> > $ns at 3.2 "$cbr(0) stop"
> > $ns at 3.4 "$cbr(1) stop"
> > $ns at 3.6 "$cbr(2) stop"
> > $ns at 3.8 "$cbr(3) stop"
> > $ns at 4.0 "$cbr(4) stop"
> > $ns at 4.2 "$cbr(5) stop"
> > $ns at 4.4 "$cbr(6) stop"
> >
> > $ns rtmodel-at 1.5 down $n(2) $n(7)
> > $ns rtmodel-at 2.5 up $n(2) $n(7)
> > $ns at 4.5 "finish"
> > $ns run
> >
> >
> >
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>
>