Skip to main content

Printing the Routing Table in DSDV protocol

Printing the routing table for any protocol is quite a easier task if the data structure is known. You may read the post on "printing the routing table for AODV protocol" 

Now this post will let you know how to print the routing table when using DSDV protocol. As you know, the DSDV protocol is a table driven protocol in which each node maintains a Routing table for a given source to destination and the table gets updated periodically to maintain the routes.

But AODV protocol is a on demand routing protocol that deals with Route Request, Route Reply for forming the routes. So printing the routing table takes a minor tweak. But the DSDV protocol handles the routing table as a data structure, here is the steps to do it.

OS Used : Linux Mint 17 - 64 bit
NS2 Used : ns-2.35
Files to be modified: dsdv.cc and dsdv.h

Step 1:
The folder where ns2 installed on my machine /home/pradeepkumar/ns-allinone-2.35/ns-2.35
Execute these commands to access the DSDV protocol
$prompt] cd /home/pradeepkumar/ns-allinone-2.35/ns-2.35
$prompt] cd dsdv
$prompt] ls 
This commands will list you all the files in the folder ~dsdv/
Now open the files dsdv.cc and dsdv.h

Step 2: dsdv.h 
We will be printing the routing table in a file called dsdv.txt
include this line in the class DSDV_Agent{....
under protected mode as given below
.........
protected:
FILE *fp;
......

Step 3: dsdv.cc

input the following line inside the constructor DSDV_Agent() as shown below

DSDV_Agent::DSDV_Agent (): Agent (PT_MESSAGE), ll_queue (0), seqno_ (0),
  myaddr_ (0), subnet_ (0), node_ (0), port_dmux_(0),
  periodic_callback_ (0), be_random_ (1),
  use_mac_ (0), verbose_ (1), trace_wst_ (0), lasttup_ (-10),
  alpha_ (0.875),  wst0_ (6), perup_ (15),
  min_update_periods_ (3) // constants
 {

fp=fopen("dsdv.txt","w");

Step 4: dsdv.cc
There is a function called updateRoute(), include the red colored line given below in to the function as shown below.

void
DSDV_Agent::updateRoute(rtable_ent *old_rte, rtable_ent *new_rte)
{
  int negvalue = -1;
  assert(new_rte);

  Time now = Scheduler::instance().clock();

  char buf[1024];
  //  snprintf (buf, 1024, "%c %.5f _%d_ (%d,%d->%d,%d->%d,%d->%d,%lf)",
  snprintf (buf, 1024, "%c %.5f _%d_ (%d,%d->%d,%d->%d,%d->%d,%f)",
   (new_rte->metric != BIG
    && (!old_rte || old_rte->metric != BIG)) ? 'D' : 'U',
   now, myaddr_, new_rte->dst,
   old_rte ? old_rte->metric : negvalue, new_rte->metric,
   old_rte ? old_rte->seqnum : negvalue,  new_rte->seqnum,
   old_rte ? old_rte->hop : -1,  new_rte->hop,
   new_rte->advertise_ok_at);
fprintf (fp, "%c %.5f _%d_ (%d,%d->%d,%d->%d,%d->%d,%f)\n",
   (new_rte->metric != BIG 
    && (!old_rte || old_rte->metric != BIG)) ? 'D' : 'U', 
   now, myaddr_, new_rte->dst, 
   old_rte ? old_rte->metric : negvalue, new_rte->metric, 
   old_rte ? old_rte->seqnum : negvalue,  new_rte->seqnum,
   old_rte ? old_rte->hop : -1,  new_rte->hop, 
   new_rte->advertise_ok_at);

  table_->AddEntry (*new_rte);
fprintf(fp,"(%d),Route table updated..\n",myaddr_);
fprintf (fp,"VWST %.12lf frm %d to %d wst %.12lf nxthp %d [of %d]\n",now, myaddr_, new_rte->dst, new_rte->wst, new_rte->hop, new_rte->metric);

  if (trace_wst_)
    trace ("VWST %.12lf frm %d to %d wst %.12lf nxthp %d [of %d]",
  now, myaddr_, new_rte->dst, new_rte->wst, new_rte->hop,
  new_rte->metric);
  if (verbose_)
    trace ("VS%s", buf);
}

Step 4: compile and make
Execute the following steps one by one
$prompt] cd /home/pradeepkumar/ns-allinone-2.35/ns-2.35
$prompt] make
if there is no error, execute any tcl file that has the dsdv protocol as the routing protocol and run it  using ns filename.tcl
here is a sample output of the pradeep.txt file

D 0.03011 _0_ (1,-1->1,-1->4,-1->1,12.030111)
(0),Route table updated..
VWST 0.030110562161 frm 0 to 1 wst 6.000000000000 nxthp 1 [of 1]
D 12.95121 _0_ (1,1->1,4->6,1->1,23.451213)
(0),Route table updated..
VWST 12.951212565148 frm 0 to 1 wst 5.250000000000 nxthp 1 [of 1]
D 25.24463 _0_ (1,1->1,6->8,1->1,34.432132)
(0),Route table updated..
VWST 25.244631607088 frm 0 to 1 wst 4.593750000000 nxthp 1 [of 1]

Here is the screenshot of the simulation
DSDV Routing table
DSDV Routing table
If you are unsure how to do it, you may send your email address through the comment section or contact page to receive these files. 

T S Pradeep Kumar 

Comments

Popular posts from this blog

AWK Scripts for NS2 to process data from Trace Files

AWK Scripts are very good in processing the data from the log (trace files) which we get from NS2. If you want to process the trace file manually, here is the detailHere is a sample of trace file from NS2 (However ns2 supports a new type of trace file also), but this post will make you understand the old trace format only.r 0.030085562 _0_ MAC  --- 0 message 32 [0 ffffffff 1 800] ------- [1:255 -1:255 32 0] r 0.030110562 _0_ RTR  --- 0 message 32 [0 ffffffff 1 800] ------- [1:255 -1:255 32 0] s 1.119926192 _0_ RTR  --- 1 message 32 [0 0 0 0] ------- [0:255 -1:255 32 0]
AWK Scripts are very good in processing the data column wise. For example
the first column in the above trace file represents r, s which indicates receive, sent respectively. If we want to trace the entire r and s alone from this trace file we can represent it as $1
So
$1 represents ACTION
$2 Time
$3 Node ID
$4 Layer
$5 Flags
$6 seqno
$7 type
$8 Size
$14 Energy (if the network nodes includes EnergyModel)To run the awk script in Li…

nam installation - Segmentation Fault (Solved)

If you are encountering "Segmentation Fault" error while running nam in Ubuntu 14.04 or Linux Mint 17+ editions, this post will be helpful for you.

Download the nam file from this link

First, remove the nam which was installed earlier using the following command 

pradeep@localhost $] sudo apt-get remove nam

and install the new nam which was downloaded just now. go to the folder where the file was downloaded and issue the following command

pradeep@localhost $]  sudo dpkg --install nam_1.15-10_i386.deb

See the screenshot below to install and use nam

 T S Pradeep Kumar

Installation of ns2 in Ubuntu 18.04 - NS2 Tutorial # 2

ns2 installation in Ubuntu 18.04

Unlike earlier version of ubuntu, the 18,04 version does not support the direct installation of ns2, because of the latest C/C++ compiler (7.x), but the latest C/C++ compiler supported by ns2 is gcc-4.8. So this post and video tells you about the installation of gcc-4.8 version, then ns2 and then configuration.
Here are the steps, Please follow the video given below for more information.

$] tar zxvf ns-allinone-2.35.tar.gz


$] sudo apt install gcc-4.8 g++-4.8

if you have installed ubuntu just now, you can try these commands also in the beginning

$] sudo apt update
$] sudo apt install build-essential autoconf automake libxmu-dev

$] cd ns-allinone-2.35/ns-2.35
$] gedit Makefile.in
$] gedit linkstate/ls.h

line number 137, change erase to this->erase
$] cd ..
$] ./install

export PATH=$PATH:/home/pradeepkumar/ns-allinone-2.35/bin:/home/pradeepkumar/ns-allinone-2.35/tcl8.5.10/unix:/home/pradeepkumar/ns-allinone-2.35/tk8.5.10/unix
export LD_LIBRARY_PATH=$L…