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