[ns] Can't Seen any tcp flow in trace file
Hi All,
I am a newbie to ns2 and trying to simulate a fat-tree like topology of depth 3
in the simulator. I am using DV routing protocol for routing and the leafs in
the topology send packets to the root of the tree (which in my case is a sink).
I have used the following to attach sources to the leaf nodes:
for {set i 1} {$i = $switches*$hosts} {incr i} {
#Create a TCP agent and attach it to hosts
set tcp($i) [new Agent/TCP]
# Create exponential traffic sources and attach it to tcp agents
set e($i) [new Application/Traffic/Exponential]
$e($i) set packetSize_ 500
#$e($i) set interval 0.005
$e($i) set burst_time_ 990ms
$e($i) set idle_time_ 10ms
$e($i) set rate_ 100k
$e($i) attach-agent $tcp($i)
}
And I attach all the leaves to the root-sink node as follows:
#Create a Null agent (a traffic sink) and attach it to node n(3)
set null0 [new Agent/Null]
$ns attach-agent $n(0) $null0
#Connect the traffic source with the traffic sink
for {set i 1} {$i = $switches*$hosts} {incr i} {
$ns connect $tcp($i) $null0
}
(Other links in the topology also seem fine, as shown in nam. Further, I also
started all the sources at the end of .tcl file)
But when I inspect the trace file, I don't see any tcp flows in the file. I
just see flows of type rtprotodv in the file.
What could be wrong here?
Thanks,
Salman
Re: [ns] Can't Seen any tcp flow in trace file
Sorry for the previous email: I have just spotted my mistake.
Regards,
Salman
From: salma...@live.com
To: ns-users@isi.edu
Subject: Can't Seen any tcp flow in trace file
Date: Wed, 19 Dec 2012 14:29:06 -0600
Hi All,
I am a newbie to ns2 and trying to simulate a fat-tree like topology of depth 3
in the simulator. I am using DV routing protocol for routing and the leafs in
the topology send packets to the root of the tree (which in my case is a sink).
I have used the following to attach sources to the leaf nodes:
for {set i 1} {$i = $switches*$hosts} {incr i} {
#Create a TCP agent and attach it to hosts
set tcp($i) [new Agent/TCP]
# Create exponential traffic sources and attach it to tcp agents
set e($i) [new Application/Traffic/Exponential]
$e($i) set packetSize_ 500
#$e($i) set interval 0.005
$e($i) set burst_time_ 990ms
$e($i) set idle_time_ 10ms
$e($i) set rate_ 100k
$e($i) attach-agent $tcp($i)
}
And I attach all the leaves to the root-sink node as follows:
#Create a Null agent (a traffic sink) and attach it to node n(3)
set null0 [new Agent/Null]
$ns attach-agent $n(0) $null0
#Connect the traffic source with the traffic sink
for {set i 1} {$i = $switches*$hosts} {incr i} {
$ns connect $tcp($i) $null0
}
(Other links in the topology also seem fine, as shown in nam. Further, I also
started all the sources at the end of .tcl file)
But when I inspect the trace file, I don't see any tcp flows in the file. I
just see flows of type rtprotodv in the file.
What could be wrong here?
Thanks,
Salman
Re: [ns] Can't Seen any tcp flow in trace file
I had the same start and finish time and hence no activity...
CC: ns-users@ISI.EDU
From: kiran13...@gmail.com
Subject: Re: [ns] Can't Seen any tcp flow in trace file
Date: Wed, 19 Dec 2012 21:55:28 +
To: salma...@live.com
Wt was the mistake?
Sent from my iPhone
On 19 ಡಿಸೆಂಬರ್ 2012, at 08:35 PM, Salman Malik salma...@live.com wrote:
Sorry for the previous email: I have just spotted my mistake.
Regards,
Salman
From: salma...@live.com
To: ns-users@isi.edu
Subject: Can't Seen any tcp flow in trace file
Date: Wed, 19 Dec 2012 14:29:06 -0600
Hi All,
I am a newbie to ns2 and trying to simulate a fat-tree like topology of
depth 3 in the simulator. I am using DV routing protocol for routing and
the leafs in the topology send packets to the root of the tree (which in my
case is a sink). I have used the following to attach sources to the leaf
nodes:
for {set i 1} {$i = $switches*$hosts} {incr i} {
#Create a TCP agent and attach it to hosts
set tcp($i) [new Agent/TCP]
# Create exponential traffic sources and attach it to tcp agents
set e($i) [new Application/Traffic/Exponential]
$e($i) set packetSize_ 500
#$e($i) set interval 0.005
$e($i) set burst_time_ 990ms
$e($i) set idle_time_ 10ms
$e($i) set rate_ 100k
$e($i) attach-agent $tcp($i)
}
And I attach all the leaves to the root-sink node as follows:
#Create a Null agent (a traffic sink) and attach it to node n(3)
set null0 [new Agent/Null]
$ns attach-agent $n(0) $null0
#Connect the traffic source with the traffic sink
for {set i 1} {$i = $switches*$hosts} {incr i} {
$ns connect $tcp($i) $null0
}
(Other links in the topology also seem fine, as shown in nam. Further, I
also started all the sources at the end of .tcl file)
But when I inspect the trace file, I don't see any tcp flows in the file. I
just see flows of type rtprotodv in the file.
What could be wrong here?
Thanks,
Salman
