Queuing Models in NS2

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M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

OpenFlow in NS3

Installation of OpenFlow in NS3 is a simple task  and here is the method to do that.

NS3 version: ns-3.24.1 and ns-3.25

Assumption: You should have installed #ns3 already in your machine. 

#OpenFlow is a software helpful for Simulating Software Defined Networks (#SDN).

There are some packages needed to enable OpenFlow. Download these packages and try the installation later.

$] sudo apt-get install libboost-all-dev libxml2 libxml2-dev 

Go to the ~ns-allinone-3.24.1/ns-3.24.1 folder and give this command 

$] hg clone http://code.nsnam.org/openflow
(if the above command does not work, the give this command)
$] sudo apt-get install mercurial

$] cd openflow
$] ./waf configure
$] ./waf build 
(if the build failed in the above steps, please give your comments)

$] cd ..
$] ./waf configure --enable-examples --enable-tests --with-openflow=path/to/openflow

In my case 
$] ./waf configure --enable-examples --enable-tests --with-openflow=openflow

After you run the above command, you should get the following screen. (See the selected white line). In the first image, it shows not enabled and the second image shows enabled
OpenFlow
OpenFlow

OpenFlow
OpenFlow

After enabling the openflow give this command 

$] ./waf build 
After this command, ensure that openflow is built as shown below
OpenFlow
OpenFlow





T S Pradeep Kumar

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