MULTICASTING ROUTING PROTOCOL

Aim:

To write a ns2 program for implementing multicasting routing protocol.

Algorithm:

Step 1: start the program.

Step 2: declare the global variables ns for creating a new simulator.

Step 3: set the color for packets.

Step 4: open the network animator file in the name of file2 in the write mode.

Step 5: open the trace file in the name of file 1 in the write mode.

Step 6: set the multicast routing protocol to transfer the packets in network.

Step 7: create the multicast capable no of nodes.

Step 8: create the duplex-link between the nodes including the delay time,bandwidth and dropping . queue mechanism.

Step 9: give the position for the links between the nodes.

Step 10: set a udp connection for source node.

Step 11: set the destination node ,port and random false for the source and destination files.

Step 12: setup a traffic generator CBR for the source and destination files.

Step 13: down the connection between any nodes at a particular time.

Step 14: create the receive agent for joining and leaving if the nodes in the group.

Step 15: define the finish procedure.

Step 16: in the definition of the finish procedure declare the global variables.

Step 17: close the trace file and namefile and execute the network animation file.

Step 18: at the particular time call the finish procedure.

Step 19: stop the program.

Program:

# Create scheduler

#Create an event scheduler wit multicast turned on

set ns [new Simulator -multicast on]

#$ns multicast

#Turn on Tracing

set tf [open output.tr w]

$ns trace-all $tf

# Turn on nam Tracing

set fd [open mcast.nam w]

$ns namtrace-all $fd

# Create nodes

set n0 [$ns node]

set n1 [$ns node]

set n2 [$ns node]

set n3 [$ns node]

set n4 [$ns node]

set n5 [$ns node]

set n6 [$ns node]

set n7 [$ns node]

# Create links

$ns duplex-link $n0 $n2 1.5Mb 10ms DropTail

$ns duplex-link $n1 $n2 1.5Mb 10ms DropTail

$ns duplex-link $n2 $n3 1.5Mb 10ms DropTail

$ns duplex-link $n3 $n4 1.5Mb 10ms DropTail

$ns duplex-link $n3 $n7 1.5Mb 10ms DropTail

$ns duplex-link $n4 $n5 1.5Mb 10ms DropTail

$ns duplex-link $n4 $n6 1.5Mb 10ms DropTail

# Routing protocol: say distance vector

#Protocols: CtrMcast, DM, ST, BST

set mproto DM

set mrthandle [$ns mrtproto $mproto {}]

# Allocate group addresses

set group1 [Node allocaddr]

set group2 [Node allocaddr]

# UDP Transport agent for the traffic source

set udp0 [new Agent/UDP]

$ns attach-agent $n0 $udp0

$udp0 set dst_addr_ $group1

$udp0 set dst_port_ 0

set cbr1 [new Application/Traffic/CBR]

$cbr1 attach-agent $udp0

# Transport agent for the traffic source

set udp1 [new Agent/UDP]

$ns attach-agent $n1 $udp1

$udp1 set dst_addr_ $group2

$udp1 set dst_port_ 0

set cbr2 [new Application/Traffic/CBR]

$cbr2 attach-agent $udp1

# Create receiver

set rcvr1 [new Agent/Null]

$ns attach-agent $n5 $rcvr1

$ns at 1.0 "$n5 join-group $rcvr1 $group1"

set rcvr2 [new Agent/Null]

$ns attach-agent $n6 $rcvr2

$ns at 1.5 "$n6 join-group $rcvr2 $group1"

set rcvr3 [new Agent/Null]

$ns attach-agent $n7 $rcvr3

$ns at 2.0 "$n7 join-group $rcvr3 $group1"

set rcvr4 [new Agent/Null]

$ns attach-agent $n5 $rcvr1

$ns at 2.5 "$n5 join-group $rcvr4 $group2"

set rcvr5 [new Agent/Null]

$ns attach-agent $n6 $rcvr2

$ns at 3.0 "$n6 join-group $rcvr5 $group2"

set rcvr6 [new Agent/Null]

$ns attach-agent $n7 $rcvr3

$ns at 3.5 "$n7 join-group $rcvr6 $group2"

$ns at 4.0 "$n5 leave-group $rcvr1 $group1"

$ns at 4.5 "$n6 leave-group $rcvr2 $group1"

$ns at 5.0 "$n7 leave-group $rcvr3 $group1"

$ns at 5.5 "$n5 leave-group $rcvr4 $group2"

$ns at 6.0 "$n6 leave-group $rcvr5 $group2"

$ns at 6.5 "$n7 leave-group $rcvr6 $group2"

# Schedule events

$ns at 0.5 "$cbr1 start"

$ns at 9.5 "$cbr1 stop"

$ns at 0.5 "$cbr2 start"

$ns at 9.5 "$cbr2 stop"

#post-processing

$ns at 10.0 "finish"

proc finish {} {

global ns tf

$ns flush-trace

close $tf

exec nam mcast.nam &

exit 0

}

# For nam

#Colors for packets from two mcast groups

$ns color 10 red

$ns color 11 green

$ns color 30 purple

$ns color 31 green

# Manual layout: order of the link is significant!

#$ns duplex-link-op $n0 $n1 orient right

#$ns duplex-link-op $n0 $n2 orient right-up

#$ns duplex-link-op $n0 $n3 orient right-down

# Show queue on simplex link n0->n1

#$ns duplex-link-op $n2 $n3 queuePos 0.5

# Group 0 source

$udp0 set fid_ 10

$n0 color red

$n0 label "Source 1"

# Group 1 source

$udp1 set fid_ 11

$n1 color green

$n1 label "Source 2"

$n5 label "Receiver 1"

$n5 color blue

$n6 label "Receiver 2"

$n6 color blue

$n7 label "Receiver 3"

$n7 color blue

#$n2 add-mark m0 red

#$n2 delete-mark m0"

# Animation rate

$ns set-animation-rate 3.0ms

$ns run