Microsoft PowerPoint - NPAS_exp7.ppt []Matlab clear all j=1; f i 0 0 01 2* i
clear all i=0:0.01:2*pi;
i (i)for i=0:0.01:2*pi y(j)=sin(i); z(j)=cos(i);
y=sin(i); z=cos(i); plot(i,y,'r');
j=j+1; end
i=0:0.01:2*pi; plot(i,y,'r');
xlabel( X-axis ) ylabel('Y-axis') legend('Sin','Cos')
Traffic shaperp (Traffic shaper)

Leaky bucket T k b k tToken bucket
Leaky bucket algorithmy g


Token
$exp2 set idle_time_ 325ms
#UDP set a2 [new Agent/UDP]
#flow id1$tbf set qlen_ 100
$ns attach-tbf-agent $n0 $a $tbf
#
#
g
#
#0.0, exp1exp2
#20 0,exp1exp2,,set exp2 [new Application/Traffic/Exponential]
#
#20.0,exp1exp2,, NAM
$ns at 20.0 "$exp1 stop;$exp2 stop;close $f;close $nf;exec nam out.nam &;exit 0"
$ns run
Differentiated service network best-effort servicemultimedia service IETFIETF
Integrated Service, IntServ
Disadv: high complexity scalabilityDisadv: high complexity, scalability Differentiated Service, DiffServ




E dit d F di (EF)Expedited Forwarding (EF) low delay, low jitter, low loss rate
Ass red For arding (AF)Assured Forwarding (AF) throughput
Client trafficDiffServclient trafficClient trafficDiffServclient traffic
DiffServ CodePoint

Ti  Slidi  Wi d  Th  C l  M k  (TSWTCM)Time Sliding Window Three Color Marker (TSWTCM) Single Rate Three Color Marker (SRTCM), Two Rate  Three Color Marker (TRTCM)                             (for Three Color Marker (TRTCM)                             (for  token bucket)
SRTCM T k  b k t Ct k Token bucket Ctoken Token bucket C tokentoken
Token bucket CtokenToken  bucket token Token bucket Etoken

TRTCM T k  b k t Pt k Token bucket Ptoken
Token bucket PtokenToken Token bucket PtokenToken  bucket Ctoken Token bucket P token
Token bucket CPtoken
Average throughputg g p