APPENDIX B : Simulation scripts
This is the simulation scripts in TCL used for the simulations in ns-2.

Fast_reroute_one-to-one.tcl
#Create a new simulator object
set ns [new Simulator]
#create tracefiles
set na [open fully_local.tr w]
set nf [open fully_local.nam w]
$ns trace-all $na
$ns namtrace-all $nf
set f0 [open fully_local-bw.tr w]
set fs [open fully_local-seq.tr w]
# Set the colors for the different packets
$ns color 0 black
$ns color 100 blue
$ns color 2 green
$ns color 50 black
$ns color 46 purple
$ns color 3 red
$ns color 4 magenta
proc finish {} {
global ns na nf f0 fs
$ns flush-trace
close $na
close $nf
close $f0
close $fs
exec nam fully_local.nam &
exec xgraph -m fully_local-bw.tr -geometry 800x400 &
exit 0
}
proc attach-expoo-traffic {node sink size burst idle rate} {
global ns
set source [new Agent/CBR/UDP]
$ns attach-agent $node $source
set traffic [new Traffic/Expoo]
$traffic set packet-size $size
$traffic set burst-time $burst
$traffic set idle-time $idle
$traffic set rate $rate
$source attach-traffic $traffic
$ns connect $source $sink
return $source
}
# Define a procedure which periodically records the bandwidth received by the
# traffic sink sink0 and writes it to the file f0.
set totalpkt 0
proc record {} {
global sink0 f0 totalpkt
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set time 0.065
#How many bytes have been received by the traffic sink?
set bw0 [$sink0 set bytes_]
#Get the current time
set now [$ns now]
#Calculate the bandwidth (in MBit/s) and write it to the file
puts $f0 "$now [expr $bw0/$time*8/1000000]"
#Reset the bytes_ values on the traffic sink
$sink0 set bytes_ 0
#Re-schedule the procedure
$ns at [expr $now+$time] "record"
set bw0 [expr $bw0 / 200]
set totalpkt [expr $totalpkt + $bw0]
}
proc recv-pkts {} {
global totalpkt seqerrnb prvseqnb
puts "The Number of Total sent packages are $prvseqnb"
puts "The Number of Total received packages are $totalpkt"
puts "The number of dropped packages are [expr $prvseqnb - $totalpkt]"
puts "The Number of Total recieved unordered packages are $seqerrnb"
}
set prvseqnb -1
set seqerrnb 0
proc seq-record {size rate ftime} {
global prvseqnb seqerrnb sink0 fs
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set tsize [parse-bw $size]
set trate [parse-bw $rate]
set time [expr double($tsize)/double($trate)/8.0]
#Get the current time
set now [$ns now]
# seek the sequence number of packet.
set revseqnb [$sink0 set expected_]
if {$prvseqnb > $revseqnb} {
incr seqerrnb 1
}
# write the sequence number of packet to the file
if {$prvseqnb != $revseqnb} {
puts $fs "$now [$sink0 set expected_]"
set prvseqnb $revseqnb
}
#Re-schedule the procedure
if { [expr $now+$time] < $ftime } {
$ns at [expr $now+$time] "seq-record $size $rate $ftime"
}
}
# routing protocol Distance Vector
$ns rtproto DV
#
# make nodes & MPLSnodes
#
set n0 [$ns node]
set n1 [$ns mpls-node]
set n2 [$ns mpls-node]
set n3 [$ns mpls-node]
set n4 [$ns mpls-node]
set n5 [$ns mpls-node]
set n6 [$ns mpls-node]
set n7 [$ns mpls-node]
set n8 [$ns mpls-node]
set n9 [$ns mpls-node]
set n10 [$ns node]
# Add RSVP-TE agents to all nodes
set rsvp1 [$n1 add-rsvp-agent]
set rsvp2 [$n2 add-rsvp-agent]
set rsvp3 [$n3 add-rsvp-agent]
set rsvp4 [$n4 add-rsvp-agent]
set rsvp5 [$n5 add-rsvp-agent]
set rsvp6 [$n6 add-rsvp-agent]
set rsvp7 [$n7 add-rsvp-agent]
set rsvp8 [$n8 add-rsvp-agent]
set rsvp9 [$n9 add-rsvp-agent]
# add variables for mpls modules
set LSRmpls1 [eval $n1 get-module "MPLS"]
set LSRmpls2 [eval $n2 get-module "MPLS"]
set LSRmpls3 [eval $n3 get-module "MPLS"]
set LSRmpls4 [eval $n4 get-module "MPLS"]
set LSRmpls5 [eval $n5 get-module "MPLS"]
set LSRmpls6 [eval $n6 get-module "MPLS"]
set LSRmpls7 [eval $n7 get-module "MPLS"]
set LSRmpls8 [eval $n8 get-module "MPLS"]
set LSRmpls9 [eval $n9 get-module "MPLS"]
#
# make links
#
$ns duplex-rsvp-link $n0 $n1 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n3 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n5 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n7 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n2 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n4 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n6 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n8 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n9 $n10 10Mb 1ms 0.99 1000 10000 Param Null
# Create a traffic sink and attach it to the node node10
set sink0 [new Agent/LossMonitor]
$ns attach-agent $n10 $sink0
$sink0 clear
# Create a traffic source
set src0 [attach-expoo-traffic $n0 $sink0 200 0 0 5000k]
$src0 set fid_ 100
$ns color 100 magenta
# Enable upcalls on all nodes
Agent/RSVP set noisy_ 255
# Set re-route option to drop
$ns enable-reroute drop
# Start recording
$ns at 0.0 "record"
$ns at 0.3 "seq-record 200 5000k 2.0"
# The setup of working LSP
$ns at 0.0 "$LSRmpls1 create-crlsp $n0 $n9 0 100 1000 +400000 5000 32 1_3_5_7_9_"
# setup of the local recovery paths
$ns at 0.2 "$LSRmpls1 create-erlsp $n0 $n5 1 100 2000 1_2_4_6_5_"
$ns at 0.3 "$LSRmpls3 create-erlsp $n0 $n9 1 100 3000 3_4_6_8_9_"
$ns at 0.4 "$LSRmpls5 create-erlsp $n0 $n9 2 100 4000 5_6_8_9_"
$ns at 0.5 "$LSRmpls7 create-erlsp $n0 $n9 1 100 5000 7_8_9_"
# bind a flow to working LSP
$ns at 0.4 "$LSRmpls1 bind-flow-erlsp 10 100 1000"
#bind backup path to lsp
$ns at 0.7 "$LSRmpls1 reroute-lsp-binding 1000 2000"
$ns at 0.7 "$LSRmpls3 reroute-lsp-binding 1000 3000"
$ns at 0.7 "$LSRmpls5 reroute-lsp-binding 1000 4000"
$ns at 0.7 "$LSRmpls7 reroute-lsp-binding 1000 5000"
#start to send
$ns at 0.5 "$src0 start"
#active failure detection
$ns at 0.1 "$ns activate-rsvp-hello 0.005 3.5"
#break link
$ns rtmodel-at 0.8 down $n5 $n7
#stop sending
$ns at 1.8 "$src0 stop"
#finish simulation
$ns at 2.0 "recv-pkts"
$ns at 2.0 "record"
$ns at 2.0 "finish"
$ns run
Haskin.tcl
#Create a new simulator object
set ns [new Simulator]
set na [open haskin.tr w]
set nf [open haskin.nam w]
$ns trace-all $na
$ns namtrace-all $nf
set f0 [open haskin-bw.tr w]
set fs [open haskin-seq.tr w]
#set colors of messages
$ns color 0 black
$ns color 1 blue
$ns color 2 green
$ns color 50 black
$ns color 46 purple
$ns color 3 red
proc finish {} {
global ns na nf f0 fs
$ns flush-trace
close $na
close $nf
close $f0
close $fs
exec nam haskin.nam &
exec xgraph -m haskin-bw.tr -geometry 800x400 &
exit 0
}
# used to setup the sender
proc attach-expoo-traffic {node sink size burst idle rate} {
global ns
set source [new Agent/CBR/UDP]
$ns attach-agent $node $source
set traffic [new Traffic/Expoo]
$traffic set packet-size $size
$traffic set burst-time $burst
$traffic set idle-time $idle
$traffic set rate $rate
$source attach-traffic $traffic
$ns connect $source $sink
return $source
}
# Define a procedure which periodically records the bandwidth received by the
# traffic sink sink0 and writes it to the file f0.
set totalpkt 0
proc record {} {
global sink0 f0 totalpkt
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set time 0.03532
#How many bytes have been received by the traffic sink?
set bw0 [$sink0 set bytes_]
#Get the current time
set now [$ns now]
#Calculate the bandwidth (in MBit/s) and write it to the file
puts $f0 "$now [expr $bw0/$time*8/1000000]"
#Reset the bytes_ values on the traffic sink
$sink0 set bytes_ 0
#Re-schedule the procedure
$ns at [expr $now+$time] "record"
set bw0 [expr $bw0 / 200]
set totalpkt [expr $totalpkt + $bw0]
}
proc recv-pkts {} {
global totalpkt seqerrnb prvseqnb
puts "The Number of Total sent packages are $prvseqnb"
puts "The Number of Total received packages are $totalpkt"
puts "The number of dropped packages are [expr $prvseqnb - $totalpkt]"
puts "The Number of Total recieved unordered packages are $seqerrnb"
}
set prvseqnb -1
set seqerrnb 0
proc seq-record {size rate ftime} {
global prvseqnb seqerrnb sink0 fs
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set tsize [parse-bw $size]
set trate [parse-bw $rate]
set time [expr double($tsize)/double($trate)/8.0]
#Get the current time
set now [$ns now]
# seek the sequence number of packet.
set revseqnb [$sink0 set expected_]
if {$prvseqnb > $revseqnb} {
incr seqerrnb 1
}
# write the sequence number of packet to the file
if {$prvseqnb != $revseqnb} {
puts $fs "$now [$sink0 set expected_]"
set prvseqnb $revseqnb
}
#Re-schedule the procedure
if { [expr $now+$time] < $ftime } {
$ns at [expr $now+$time] "seq-record $size $rate $ftime"
}
}
# routing protocol distance vector
$ns rtproto DV
# make nodes & MPLSnodes
set n0 [$ns node]
set n1 [$ns mpls-node]
set n2 [$ns mpls-node]
set n3 [$ns mpls-node]
set n4 [$ns mpls-node]
set n5 [$ns mpls-node]
set n6 [$ns mpls-node]
set n7 [$ns mpls-node]
set n8 [$ns mpls-node]
set n9 [$ns mpls-node]
set n10 [$ns node]
# Add RSVP-TE agents to all nodes
set rsvp1 [$n1 add-rsvp-agent]
set rsvp2 [$n2 add-rsvp-agent]
set rsvp3 [$n3 add-rsvp-agent]
set rsvp4 [$n4 add-rsvp-agent]
set rsvp5 [$n5 add-rsvp-agent]
set rsvp6 [$n6 add-rsvp-agent]
set rsvp7 [$n7 add-rsvp-agent]
set rsvp8 [$n8 add-rsvp-agent]
set rsvp9 [$n9 add-rsvp-agent]
# add variables for mpls modules
set LSRmpls1 [eval $n1 get-module "MPLS"]
set LSRmpls2 [eval $n2 get-module "MPLS"]
set LSRmpls3 [eval $n3 get-module "MPLS"]
set LSRmpls4 [eval $n4 get-module "MPLS"]
set LSRmpls5 [eval $n5 get-module "MPLS"]
set LSRmpls6 [eval $n6 get-module "MPLS"]
set LSRmpls7 [eval $n7 get-module "MPLS"]
set LSRmpls8 [eval $n8 get-module "MPLS"]
set LSRmpls9 [eval $n9 get-module "MPLS"]
# make links
$ns duplex-rsvp-link $n0 $n1 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n3 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n5 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n7 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n2 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n4 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n6 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n8 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n9 $n10 10Mb 1ms 0.99 1000 10000 Param Null
# Create a traffic sink and attach it to the node node10
set sink0 [new Agent/LossMonitor]
$ns attach-agent $n10 $sink0
$sink0 clear
# Create a traffic source
set src0 [attach-expoo-traffic $n0 $sink0 200 0 0 5000k]
$src0 set fid_ 100
$ns color 100 magenta
# Enable upcalls on all nodes
Agent/RSVP set noisy_ 255
# Set re-route option to drop
$ns enable-reroute drop
# Start recording
$ns at 0.0 "record"
$ns at 0.3 "seq-record 200 5000k 2.0"
# The setup of working LSP
$ns at 0.0 "$LSRmpls1 create-erlsp $n0 $n9 0 100 1000 1_3_5_7_9_"
# The setup of global recovery LSP
$ns at 0.1 "$LSRmpls1 create-erlsp $n1 $n9 1 100 2000 1_2_4_6_8_9_"
#activate the hello mechanism
$ns at 0.1 "$ns activate-rsvp-hello 0.005 3.5"
#Setup of reverse path. php used..
$ns at 0.4 "$LSRmpls7 create-erlsp $n7 $n2 1 100 2005 7_5_3_1_2_"
# bind a flow to working LSP
$ns at 0.4 "$LSRmpls1 bind-flow-erlsp 10 100 1000"
#start sending traffic
$ns at 0.5 "$src0 start"
#binding working LSP to alternative LSP
$ns at 0.6 "$LSRmpls1 reroute-lsp-binding 1000 2000"
$ns at 0.6 "$LSRmpls3 reroute-lsp-binding 1000 2005"
$ns at 0.6 "$LSRmpls5 reroute-lsp-binding 1000 2005"
$ns at 0.6 "$LSRmpls7 reroute-lsp-binding 1000 2005"
#break link
$ns rtmodel-at 0.8 down $n5 $n7
#stop trffic
$ns at 1.8 "$src0 stop"
#end simulation
$ns at 2.0 "recv-pkts"
$ns at 2.0 "record"
$ns at 2.0 "finish"
$ns run
Local_Reroute.tcl
#Create a new simulator object
set ns [new Simulator]
set na [open local_precalc_shortest.tr w]
set nf [open local_precalc_shortest.nam w]
$ns trace-all $na
$ns namtrace-all $nf
set f0 [open local_precalc_shortest-bw.tr w]
set fs [open local_precalc_shortest-seq.tr w]
#colors for the message types
$ns color 0 yellow
$ns color 100 blue
$ns color 2 green
$ns color 50 black
$ns color 46 purple
$ns color 3 red
$ns color 4 magenta
proc finish {} {
global ns na nf f0 fs
$ns flush-trace
close $na
close $nf
close $f0
close $fs
exec nam local_precalc_shortest.nam &
exec xgraph -m local_precalc_shortest-bw.tr -geometry 800x400 &
exit 0
}
proc attach-expoo-traffic {node sink size burst idle rate} {
global ns
set source [new Agent/CBR/UDP]
$ns attach-agent $node $source
set traffic [new Traffic/Expoo]
$traffic set packet-size $size
$traffic set burst-time $burst
$traffic set idle-time $idle
$traffic set rate $rate
$source attach-traffic $traffic
$ns connect $source $sink
return $source
}
# Define a procedure which periodically records the bandwidth received by the
# traffic sink sink0 and writes it to the file f0.
set totalpkt 0
proc record {} {
global sink0 f0 totalpkt
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set time 0.065
#How many bytes have been received by the traffic sink?
set bw0 [$sink0 set bytes_]
#Get the current time
set now [$ns now]
#Calculate the bandwidth (in MBit/s) and write it to the file
puts $f0 "$now [expr $bw0/$time*8/1000000]"
#Reset the bytes_ values on the traffic sink
$sink0 set bytes_ 0
#Re-schedule the procedure
$ns at [expr $now+$time] "record"
set bw0 [expr $bw0 / 200]
set totalpkt [expr $totalpkt + $bw0]
}
proc recv-pkts {} {
global totalpkt seqerrnb prvseqnb
puts "The Number of Total sent packages are $prvseqnb"
puts "The Number of Total received packages are $totalpkt"
puts "The number of dropped packages are [expr $prvseqnb - $totalpkt]"
puts "The Number of Total recieved unordered packages are $seqerrnb"
}
set prvseqnb -1
set seqerrnb 0
proc seq-record {size rate ftime} {
global prvseqnb seqerrnb sink0 fs
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set tsize [parse-bw $size]
set trate [parse-bw $rate]
set time [expr double($tsize)/double($trate)/8.0]
#Get the current time
set now [$ns now]
# seek the sequence number of packet.
set revseqnb [$sink0 set expected_]
if {$prvseqnb > $revseqnb} {
incr seqerrnb 1
}
# write the sequence number of packet to the file
if {$prvseqnb != $revseqnb} {
puts $fs "$now [$sink0 set expected_]"
set prvseqnb $revseqnb
}
#Re-schedule the procedure
if { [expr $now+$time] < $ftime } {
$ns at [expr $now+$time] "seq-record $size $rate $ftime"
}
}
# routing protocol
$ns rtproto DV
#
# make nodes & MPLSnodes
#
set n0 [$ns node]
set n1 [$ns mpls-node]
set n2 [$ns mpls-node]
set n3 [$ns mpls-node]
set n4 [$ns mpls-node]
set n5 [$ns mpls-node]
set n6 [$ns mpls-node]
set n7 [$ns mpls-node]
set n8 [$ns mpls-node]
set n9 [$ns mpls-node]
set n10 [$ns node]
# Add RSVP-TE agents to all nodes
set rsvp1 [$n1 add-rsvp-agent]
set rsvp2 [$n2 add-rsvp-agent]
set rsvp3 [$n3 add-rsvp-agent]
set rsvp4 [$n4 add-rsvp-agent]
set rsvp5 [$n5 add-rsvp-agent]
set rsvp6 [$n6 add-rsvp-agent]
set rsvp7 [$n7 add-rsvp-agent]
set rsvp8 [$n8 add-rsvp-agent]
set rsvp9 [$n9 add-rsvp-agent]
# add variables for mpls modules
set LSRmpls1 [eval $n1 get-module "MPLS"]
set LSRmpls2 [eval $n2 get-module "MPLS"]
set LSRmpls3 [eval $n3 get-module "MPLS"]
set LSRmpls4 [eval $n4 get-module "MPLS"]
set LSRmpls5 [eval $n5 get-module "MPLS"]
set LSRmpls6 [eval $n6 get-module "MPLS"]
set LSRmpls7 [eval $n7 get-module "MPLS"]
set LSRmpls8 [eval $n8 get-module "MPLS"]
set LSRmpls9 [eval $n9 get-module "MPLS"]
#
# make links
#
$ns duplex-rsvp-link $n0 $n1 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n3 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n5 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n7 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n2 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n4 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n6 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n8 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n9 $n10 10Mb 1ms 0.99 1000 10000 Param Null
# Create a traffic sink and attach it to the node node10
set sink0 [new Agent/LossMonitor]
$ns attach-agent $n10 $sink0
$sink0 clear
# Create a traffic source
set src0 [attach-expoo-traffic $n0 $sink0 200 0 0 5000k]
$src0 set fid_ 100
$ns color 100 magenta
# Enable upcalls on all nodes
Agent/RSVP set noisy_ 255
#function that calculates a new recovery path
proc setup_backup_path {lspid} {
global ns LSRmpls5 n0 n9
set oiface [$LSRmpls5 get-outgoing-iface $lspid]
set fec [$LSRmpls5 get-fec-for-lspid $lspid]
set qosid [$LSRmpls5 get-flowid-for-lspid $lspid]
set failnext [$LSRmpls5 get-failnext-for-lspid $lspid]
if {$failnext != -1} {
set fnodes [split $failnext "_"]
set fnodes [linsert $fnodes 0 $oiface]
} else {
set fnodes $oiface
}
set er [$ns get-shortest-path [[$LSRmpls5 node] id] $fec $fnodes "" ]
while { $er == -1 } {
if { [llength $fnodes] == 0} {
puts "error: routing failure"
return -1
}
set dst [lindex $fnodes end]
set fnodes [lreplace $fnodes end end]
set er [$ns get-shortest-path [[$LSRmpls5 node] id] $dst $fnodes "" ]
}
set er [append $er $er _]
puts "Setting up recovery path $er"
$ns at [$ns now] "$LSRmpls5 create-crlsp $n0 $n9 1 100 2000 +400000 5000 32 $er"
#bind backup path to lsp, value for time found in tracefiles
$ns at 0.8263 "$LSRmpls5 reroute-lsp-binding 1000 2000"
}
# Set re-route option to drop
$ns enable-reroute drop
# Start recording
$ns at 0.0 "record"
$ns at 0.3 "seq-record 200 5000k 2.0"
# The setup of working LSP
$ns at 0.0 "$LSRmpls1 create-crlsp $n0 $n9 0 100 1000 +400000 5000 32 1_3_5_7_9_"
# bind a flow to working LSP
$ns at 0.4 "$LSRmpls1 bind-flow-erlsp 10 100 1000"
#start sending
$ns at 0.5 "$src0 start"
#break link
$ns rtmodel-at 0.8 down $n5 $n7
#active failure detection
$ns at 0.1 "$ns activate-rsvp-hello 0.005 3.5"
# The setup of backup LSP, time added for path calculation
$ns at 0.81949 "setup_backup_path 1000"
$ns at 1.8 "$src0 stop"
$ns at 2.0 "recv-pkts"
$ns at 2.0 "record"
$ns at 2.0 "finish"
$ns run
Makam.tcl
#Create a new simulator object
set ns [new Simulator]
set na [open prealloc.tr w]
set nf [open prealloc.nam w]
$ns trace-all $na
$ns namtrace-all $nf
set f0 [open prealloc-bw.tr w]
set fs [open prealloc-seq.tr w]
#colors for the different message types
$ns color 0 yellow
$ns color 100 blue
$ns color 2 green
$ns color 50 black
$ns color 46 purple
$ns color 3 red
$ns color 4 magenta
proc finish {} {
global ns na nf f0 fs
$ns flush-trace
close $na
close $nf
close $f0
close $fs
exec nam prealloc.nam &
exec xgraph -m prealloc-bw.tr -geometry 800x400 &
exit 0
}
proc attach-expoo-traffic {node sink size burst idle rate} {
global ns
set source [new Agent/CBR/UDP]
$ns attach-agent $node $source
set traffic [new Traffic/Expoo]
$traffic set packet-size $size
$traffic set burst-time $burst
$traffic set idle-time $idle
$traffic set rate $rate
$source attach-traffic $traffic
$ns connect $source $sink
return $source
}
# Define a procedure which periodically records the bandwidth received by the
# traffic sink sink0 and writes it to the file f0.
set totalpkt 0
proc record {} {
global sink0 f0 totalpkt
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set time 0.065
#How many bytes have been received by the traffic sink?
set bw0 [$sink0 set bytes_]
#Get the current time
set now [$ns now]
#Calculate the bandwidth (in MBit/s) and write it to the file
puts $f0 "$now [expr $bw0/$time*8/1000000]"
#Reset the bytes_ values on the traffic sink
$sink0 set bytes_ 0
#Re-schedule the procedure
$ns at [expr $now+$time] "record"
set bw0 [expr $bw0 / 200]
set totalpkt [expr $totalpkt + $bw0]
}
proc recv-pkts {} {
global totalpkt seqerrnb prvseqnb
puts "The Number of Total sent packages are $prvseqnb"
puts "The Number of Total received packages are $totalpkt"
puts "The number of dropped packages are [expr $prvseqnb - $totalpkt]"
puts "The Number of Total recieved unordered packages are $seqerrnb"
}
set prvseqnb -1
set seqerrnb 0
proc seq-record {size rate ftime} {
global prvseqnb seqerrnb sink0 fs
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set tsize [parse-bw $size]
set trate [parse-bw $rate]
set time [expr double($tsize)/double($trate)/8.0]
#Get the current time
set now [$ns now]
# seek the sequence number of packet.
set revseqnb [$sink0 set expected_]
if {$prvseqnb > $revseqnb} {
incr seqerrnb 1
}
# write the sequence number of packet to the file
if {$prvseqnb != $revseqnb} {
puts $fs "$now [$sink0 set expected_]"
set prvseqnb $revseqnb
}
#Re-schedule the procedure
if { [expr $now+$time] < $ftime } {
$ns at [expr $now+$time] "seq-record $size $rate $ftime"
}
}
# routing protocol
$ns rtproto DV
#
# make nodes & MPLSnodes
#
set n0 [$ns node]
set n1 [$ns mpls-node]
set n2 [$ns mpls-node]
set n3 [$ns mpls-node]
set n4 [$ns mpls-node]
set n5 [$ns mpls-node]
set n6 [$ns mpls-node]
set n7 [$ns mpls-node]
set n8 [$ns mpls-node]
set n9 [$ns mpls-node]
set n10 [$ns node]
# Add RSVP-TE agents to all nodes
set rsvp1 [$n1 add-rsvp-agent]
set rsvp2 [$n2 add-rsvp-agent]
set rsvp3 [$n3 add-rsvp-agent]
set rsvp4 [$n4 add-rsvp-agent]
set rsvp5 [$n5 add-rsvp-agent]
set rsvp6 [$n6 add-rsvp-agent]
set rsvp7 [$n7 add-rsvp-agent]
set rsvp8 [$n8 add-rsvp-agent]
set rsvp9 [$n9 add-rsvp-agent]
# add variables for mpls modules
set LSRmpls1 [eval $n1 get-module "MPLS"]
set LSRmpls2 [eval $n2 get-module "MPLS"]
set LSRmpls3 [eval $n3 get-module "MPLS"]
set LSRmpls4 [eval $n4 get-module "MPLS"]
set LSRmpls5 [eval $n5 get-module "MPLS"]
set LSRmpls6 [eval $n6 get-module "MPLS"]
set LSRmpls7 [eval $n7 get-module "MPLS"]
set LSRmpls8 [eval $n8 get-module "MPLS"]
set LSRmpls9 [eval $n9 get-module "MPLS"]
#
# make links
#
$ns duplex-rsvp-link $n0 $n1 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n3 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n5 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n7 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n2 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n4 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n6 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n8 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n9 $n10 10Mb 1ms 0.99 1000 10000 Param Null
# Create a traffic sink and attach it to the node node10
set sink0 [new Agent/LossMonitor]
$ns attach-agent $n10 $sink0
$sink0 clear
# Create a traffic source
set src0 [attach-expoo-traffic $n0 $sink0 200 0 0 5000k]
$src0 set fid_ 100
$ns color 100 magenta
# Enable upcalls on all nodes
Agent/RSVP set noisy_ 255
# Set re-route option to drop
$ns enable-reroute drop
# Start recording
$ns at 0.0 "record"
$ns at 0.3 "seq-record 200 5000k 2.0"
# The setup of working LSP
$ns at 0.0 "$LSRmpls1 create-crlsp $n0 $n9 0 100 1000 +400000 5000 32 1_3_5_7_9_"
# The setup of backup LSP
$ns at 0.2 "$LSRmpls1 reroute-prealloc $n0 $n9 $n10 0 1 100 2000 +400000 5000 32 1_2_4_6_8_9_"
# bind a flow to working LSP
$ns at 0.4 "$LSRmpls1 bind-flow-erlsp 10 100 1000"
# start sending traffic
$ns at 0.5 "$src0 start"
#Break link
$ns rtmodel-at 0.8 down $n5 $n7
#activate hello
$ns at 0.1 "$ns activate-rsvp-hello 0.005 3.5"
$ns at 1.8 "$src0 stop"
$ns at 2.0 "recv-pkts"
$ns at 2.0 "record"
$ns at 2.0 "finish"
$ns run
Best_Effort.tcl
#Create a new simulator object
set ns [new Simulator]
set na [open precalc.tr w]
set nf [open precalc.nam w]
$ns trace-all $na
$ns namtrace-all $nf
set f0 [open precalc-bw.tr w]
set fs [open precalc-seq.tr w]
#colors for the different message types
$ns color 0 yellow
$ns color 100 blue
$ns color 2 green
$ns color 50 black
$ns color 46 purple
$ns color 3 red
$ns color 4 magenta
proc finish {} {
global ns na nf f0 fs
$ns flush-trace
close $na
close $nf
close $f0
close $fs
exec nam precalc.nam &
exec xgraph -m precalc-bw.tr -geometry 800x400 &
exit 0
}
proc attach-expoo-traffic {node sink size burst idle rate} {
global ns
set source [new Agent/CBR/UDP]
$ns attach-agent $node $source
set traffic [new Traffic/Expoo]
$traffic set packet-size $size
$traffic set burst-time $burst
$traffic set idle-time $idle
$traffic set rate $rate
$source attach-traffic $traffic
$ns connect $source $sink
return $source
}
# Define a procedure which periodically records the bandwidth received by the
# traffic sink sink0 and writes it to the file f0.
set totalpkt 0
proc record {} {
global sink0 f0 totalpkt
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set time 0.065
#How many bytes have been received by the traffic sink?
set bw0 [$sink0 set bytes_]
#Get the current time
set now [$ns now]
#Calculate the bandwidth (in MBit/s) and write it to the file
puts $f0 "$now [expr $bw0/$time*8/1000000]"
#Reset the bytes_ values on the traffic sink
$sink0 set bytes_ 0
#Re-schedule the procedure
$ns at [expr $now+$time] "record"
set bw0 [expr $bw0 / 200]
set totalpkt [expr $totalpkt + $bw0]
}
proc recv-pkts {} {
global totalpkt seqerrnb prvseqnb
puts "The Number of Total sent packages are $prvseqnb"
puts "The Number of Total received packages are $totalpkt"
puts "The number of dropped packages are [expr $prvseqnb - $totalpkt]"
puts "The Number of Total recieved unordered packages are $seqerrnb"
}
set prvseqnb -1
set seqerrnb 0
proc seq-record {size rate ftime} {
global prvseqnb seqerrnb sink0 fs
set ns [Simulator instance]
#Set the time after which the procedure should be called again
set tsize [parse-bw $size]
set trate [parse-bw $rate]
set time [expr double($tsize)/double($trate)/8.0]
#Get the current time
set now [$ns now]
# seek the sequence number of packet.
set revseqnb [$sink0 set expected_]
if {$prvseqnb > $revseqnb} {
incr seqerrnb 1
}
# write the sequence number of packet to the file
if {$prvseqnb != $revseqnb} {
puts $fs "$now [$sink0 set expected_]"
set prvseqnb $revseqnb
}
#Re-schedule the procedure
if { [expr $now+$time] < $ftime } {
$ns at [expr $now+$time] "seq-record $size $rate $ftime"
}
}
# routing protocol
#$ns rtproto DV
#
# make nodes & MPLSnodes
#
set n0 [$ns node]
set n1 [$ns mpls-node]
set n2 [$ns mpls-node]
set n3 [$ns mpls-node]
set n4 [$ns mpls-node]
set n5 [$ns mpls-node]
set n6 [$ns mpls-node]
set n7 [$ns mpls-node]
set n8 [$ns mpls-node]
set n9 [$ns mpls-node]
set n10 [$ns node]
# Add RSVP-TE agents to all nodes
set rsvp1 [$n1 add-rsvp-agent]
set rsvp2 [$n2 add-rsvp-agent]
set rsvp3 [$n3 add-rsvp-agent]
set rsvp4 [$n4 add-rsvp-agent]
set rsvp5 [$n5 add-rsvp-agent]
set rsvp6 [$n6 add-rsvp-agent]
set rsvp7 [$n7 add-rsvp-agent]
set rsvp8 [$n8 add-rsvp-agent]
set rsvp9 [$n9 add-rsvp-agent]
# add variables for mpls modules
set LSRmpls1 [eval $n1 get-module "MPLS"]
set LSRmpls2 [eval $n2 get-module "MPLS"]
set LSRmpls3 [eval $n3 get-module "MPLS"]
set LSRmpls4 [eval $n4 get-module "MPLS"]
set LSRmpls5 [eval $n5 get-module "MPLS"]
set LSRmpls6 [eval $n6 get-module "MPLS"]
set LSRmpls7 [eval $n7 get-module "MPLS"]
set LSRmpls8 [eval $n8 get-module "MPLS"]
set LSRmpls9 [eval $n9 get-module "MPLS"]
#
# make links
#
$ns duplex-rsvp-link $n0 $n1 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n3 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n5 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n7 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n2 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n4 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n6 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n8 $n9 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n1 $n2 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n3 $n4 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n5 $n6 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n7 $n8 10Mb 1ms 0.99 1000 10000 Param Null
$ns duplex-rsvp-link $n9 $n10 10Mb 1ms 0.99 1000 10000 Param Null
# Create a traffic sink and attach it to the node node10
set sink0 [new Agent/LossMonitor]
$ns attach-agent $n10 $sink0
$sink0 clear
# Create a traffic source
set src0 [attach-expoo-traffic $n0 $sink0 200 0 0 5000k]
$src0 set fid_ 100
$ns color 100 magenta
# Enable upcalls on all nodes
Agent/RSVP set noisy_ 255
# Set re-route option to drop
$ns enable-reroute drop
# Start recording
$ns at 0.0 "record"
$ns at 0.3 "seq-record 200 5000k 2.0"
# The setup of working LSP
$ns at 0.0 "$LSRmpls1 create-crlsp $n0 $n9 0 100 1000 +400000 5000 32 1_3_5_7_9_"
# The setup of backup LSP
$ns at 0.2 "$LSRmpls1 reroute-precalc $n0 $n9 $n10 0 100 2000 +400000 5000 32 1_2_4_6_8_9_"
# bind a flow to working LSP
$ns at 0.4 "$LSRmpls1 bind-flow-erlsp 10 100 1000"
#start traffic sending
$ns at 0.5 "$src0 start"
#break link
$ns rtmodel-at 0.8 down $n5 $n7
#activate hello
$ns at 0.1 "$ns activate-rsvp-hello 0.005 3.5"
$ns at 1.8 "$src0 stop"
$ns at 2.0 "recv-pkts"
$ns at 2.0 "record"
$ns at 2.0 "finish"
$ns run






APPENDIX C : Ns-2 modifications
This is some of the modifications that had to bee done to implement failure detection by RSVP-TE hellos in ns-2. For the full implementation a patch is available for download from [68].
Ns-mpls-node.tcl
RtModule/MPLS instproc activate_rsvp_hello {Dest Hinterv Dinterv} {
global ns
set class [$self set classifier_]
set node1 [$class set mpls_node_]
set agent1 [$node1 set rsvp_]
set node1_ID [$node1 set id_]
set dest_ [$Dest set id_]
$agent1 start-hello $dest_ $Hinterv
$agent1 hello_check_failure $dest_ $Hinterv $Dinterv $node1_ID
}
Agent/RSVP instproc reschedule_hello_request {Dest H_interv} {
global ns
$ns at [expr [$ns now] + $H_interv] "$self start-hello $Dest $H_interv"
}
Agent/RSVP instproc hello_check_failure {Dest Hintervall Dintervall my_id} {
global ns
set intervall [expr $Hintervall * $Dintervall]
set check_time [expr [$ns now] + $Hintervall * $Dintervall]
$ns at $check_time "$self hello_check $Dest $intervall $my_id"
}
Agent/RSVP instproc reschedule_hello_check {Dest interv my_id} {
global ns
set check_time [expr [$ns now] + $interv]
$ns at $check_time "$self hello_check $Dest $interv $my_id"
}
Agent/RSVP instproc hello_set_lib_error {from_node to_node lspid} {
global ns
puts "Breaking connection for LSP $lspid at [$ns now]"
$self instvar node_
set MPLSnode [eval $node_ get-module "MPLS"]
$ns at [$ns now] "$MPLSnode set-lib-error-for-lspid $lspid 1"
}
Simulator instproc activate-rsvp-hello {hello_int fail_int} {
$self instvar linked_mplsnodes_
set len [llength $linked_mplsnodes_]
for {set i 0} {$i < $len} {incr i} {
set me [lindex $linked_mplsnodes_ $i]
set class [$me set classifier_]
set node1 [$class set mpls_node_]
set agent1 [$me set rsvp_]
set node1_ID [$me set id_]
set mpls_node1 [eval $node1 get-module "MPLS"]
RSVP-objects.h
class HELLO : public RSVPobject {
public:
HELLO(long src, long dst,int ctype);
HELLO(unsigned char *cont);
virtual ~HELLO() {};
inline long get_src_inst() { return con->src_inst;}
inline long get_dst_inst() { return con->dst_inst;}
void dump_object();
private:
struct construct {
long src_inst;
long dst_inst;
};
struct construct *con;
};
RSVP-objects.cc
HELLO::HELLO(long src, long dest, int ctype) {
int cl;
cl = sizeof(struct objheader) + sizeof(struct construct);
contents = new unsigned char[cl];
header = (objheader *)contents;
con = (construct *)(contents + sizeof(struct objheader));
header->ctype = ctype; // 1 is for REQUEST , 2 is for ACK
header->length = 12;
con->src_inst = src;
con->dst_inst = dest;
header->classnum = 22;
header->conlength = cl;
}
HELLO::HELLO(unsigned char *cont) {
header = (objheader *)cont;
contents = new unsigned char[header->conlength];
memcpy(contents, cont, header->conlength);
header = (objheader *)contents;
con = (construct *)(contents + sizeof(struct objheader));
}
void HELLO::dump_object() {
RSVPobject::dump_object();
printf(" HELLO: src instance: %ld dst instance: %ld\n",
con->src_inst, con->dst_inst);
}
RSVP.cc
if (strcmp(argv[1], "start-hello") == 0) {
nsaddr_t destination;
if (argc != 4) {
return (TCL_ERROR);
}
destination = atoi(argv[2]);
send_hello_message(destination, 1); // start by sending a REQUEST message
//reschedule a new REQUEST message
tcl.evalf("%s reschedule_hello_request %i %f", name(), atoi(argv[2]),atof(argv[3]));
return (TCL_OK);
}
// Used to check if HELLO has detected a failure
if(strcmp(argv[1],"hello_check") == 0) {
nsaddr_t destination;
nsaddr_t this_node;
float intervall;
hello_values *hello_req;
hello_values *hello_ack;
hello_req = hello_requested_;
hello_ack = hello_acked_;
double req_time;
double ack_time;
if(argc != 5) {
return (TCL_ERROR);
}
destination = atoi(argv[2]);
intervall = atof(argv[3]);
this_node = atoi(argv[4]);
if(hello_req != NULL){
while((hello_req->node != destination) && (hello_req != NULL)){
hello_req = hello_req->next;
}
if(hello_req->node == destination){
ack_time = hello_req->acked_time;
}
else {
printf("[HELLO] Something is wrong, didn't find instance value for node %i in node %i instance list\n",destination,this_node);
}
}
else {
printf("[HELLO] Something is wrong, there is no instance values list for node % in node %i \n",destination,this_node);
}
if((Scheduler::instance().clock() - intervall) > ack_time ) { // did I loose the connection ?
// set instance value for neighbor to 0
hello_req->neighbor_instance = 0;
// take a new instance value to send to this neighbor
hello_req->my_instance = rand();
elem *node_list;
session *s_list;
psb *p_list;
s_list = s_list_;
while (s_list != NULL) {
p_list = s_list->psb_list;
while (p_list != NULL){
node_list = p_list->ero->get_ero();
while (node_list != NULL) {
if((node_list->nodo == this_node) && (node_list->pun != NULL)){
if(node_list->pun->nodo == destination){
tcl.evalf("%s hello_set_lib_error %i %i %i",name(),destination,this_node,p_list->tid);
tcl.evalf("%s break-link-hello %i", name(),destination);
}
else {break;}
}
node_list = node_list->pun;
}
p_list = p_list->next;
}
s_list = s_list->next;
}
//reschedule a new failure check
tcl.evalf("%s reschedule_hello_check %i %f %i", name(), destination ,atof(argv[3]),this_node);
return (TCL_OK);
}
return (Agent::command(argc, argv));
}
void RSVPAgent::process_hello_message(RSVPmessage *msg, nsaddr_t fromhop) {
hello_values *hello_list;
long src_inst;
long dst_inst;
int c_type;
int rand_int;
HELLO *he = (HELLO *)msg->get_first(22);
src_inst = he->get_src_inst();
dst_inst = he->get_dst_inst();
c_type = he->get_ctype();
if(c_type == 1) { // This is a REQUEST message
hello_list = hello_acked_; // get the instance list
if (dst_inst == 0) { // is this the first message recieved or the sender has lost connection
// during the set time period.
if(hello_list != NULL){
while(hello_list->next != NULL){
if(hello_list->node == fromhop)
{break;}
else {
hello_list = hello_list->next;
}
}
if(hello_list->node != fromhop) {
hello_list->next = new hello_values();
hello_list = hello_list->next;
hello_list->neighbor_instance = src_inst;
rand_int = rand();
hello_list->my_instance = rand_int;
hello_list->node = fromhop;
}
else {
// this node has restarted
hello_list->neighbor_instance = src_inst;
hello_list->my_instance = rand(); // create a new instance for my self since i have restarted
}
}
else // hello_list == NULL
{
hello_list = new hello_values();
hello_list->neighbor_instance = src_inst;
rand_int = rand();
hello_list->my_instance = rand_int; // the instance value is a random number
hello_list->node = fromhop;
hello_acked_ = hello_list;
}
}
send_hello_message(fromhop,2); // send ACK message
}
else if(c_type == 2) { // recieved an ACK message
hello_list = hello_requested_;
if(hello_list == NULL){
printf("Something is wrong, recieved an HELLO ACK object but there is no instance value for this node in the list\n");
}
else {
while(hello_list->next != NULL) {
if(hello_list->node != fromhop){
hello_list = hello_list->next;
}
else {
break;
}
}
if(hello_list->node == fromhop){ // check if the node has restarted
if(hello_list->neighbor_instance != src_inst){
if(hello_list->neighbor_instance == 0){
hello_list->neighbor_instance = src_inst;
}
else {
// printf("Node has restarted\n");
hello_list->neighbor_instance == src_inst;
}
}
hello_list->acked_time = Scheduler::instance().clock(); // updates time for hello_requested
}
}
}
}
void RSVPAgent::send_hello_message(nsaddr_t destination, int ctype) {
if (nam_) {
type_ = PT_HELLO;
}
int rand_int;
hello_values *hello_sessions;
if (ctype == 1) {
hello_sessions = hello_requested_;
}
else if (ctype == 2){
hello_sessions = hello_acked_;
}
long src_inst;
long dst_inst;
// save the values internally in the agent.
if (hello_sessions == NULL){ // shall we make a new record
hello_sessions = new hello_values();
hello_sessions->node = destination;
rand_int = rand();
hello_sessions->my_instance = rand_int;
hello_sessions->neighbor_instance = 0;
if(ctype == 1){
hello_requested_ = hello_sessions; // saves the newly created list object
}
}
else {
while (hello_sessions->next != NULL) { // find this HELLO session
if (hello_sessions->node == destination)
{ break; }
else
{ hello_sessions = hello_sessions->next; }
}
if(hello_sessions->node != destination) {
hello_sessions->next = new hello_values();
hello_sessions = hello_sessions->next;
hello_sessions->node = destination;
if(ctype == 1){
hello_sessions->neighbor_instance = 0;
rand_int=rand();
hello_sessions->my_instance = rand_int;
}
}
}//else (hello_sessions == NULL)
if (ctype == 1) { // This is a REQUEST message
src_inst = hello_sessions->my_instance;
dst_inst = hello_sessions->neighbor_instance;
hello_sessions->old_time = Scheduler::instance().clock();
// printf("REQUEST src_inst : %i dst_inst : %i\n",src_inst,dst_inst);
}
if (ctype == 2) { // This is an ACK message
src_inst = hello_sessions->my_instance; // instance values for ACK
dst_inst = hello_sessions->neighbor_instance; // is created in the recieving function
//printf("ACK src_inst : %i dst_inst : %i\n",src_inst,dst_inst);
}
// Create and send out the HELLO message
RSVPmessage *msg = new RSVPmessage(HELLO_TYPE, 1); // ttl set to 1
msg->add_object(new HELLO(src_inst, dst_inst, ctype));
if (ip6_) {
size_ = msg->get_length() + 40;
} else {
size_ = msg->get_length() + 24;
}
dst_.addr_ = destination;
fid_ = 46; // needs to be 46 to be assosiated with RSVP
Packet *pkt = allocpkt();
pkt->allocdata(msg->get_conlength());
memcpy(pkt->accessdata(), msg->get_contents(), msg->get_conlength());
send(pkt, 0);
delete msg;
}