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NS Fundamentals (contd..)

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1. NS Fundamentals (contd..) Padma Haldar. USC/ISI. 2. Outline. Ns fundamentals Part I (by Chen) ... Tcl commands translates into. series of object creation ... – PowerPoint PPT presentation

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Title: NS Fundamentals (contd..)


1
NS Fundamentals (contd..)
  • Padma Haldar
  • USC/ISI

2
Outline
  • Ns fundamentals Part I (by Chen)
  • NS fundamentals Part II
  • NS Internals

3
Ns Internals
  • Tcl commands translates into
  • series of object creation
  • plumbing of these objects
  • Step-by-step review of how each network component
    gets set up in ns

4
Network Topology Node
Unicast Node
0
0
1
Set ns_ new Simulator multicast on Set n1 ns_
node
set n0 ns_ node
5
Node Addressing
  • Two basic address styles available flat and
    hierarchical
  • Default flat address 32 bits each for node and
    port id
  • Default hier address
  • 3 levels of hierarchy
  • 10 11 11 or 1 9 11 11 if mcast specified
  • Different bit allocation possible for specific
    hier addresses

6
Hierarchical Node
n2
Address classifier
To Port demux
Node entry
Level 3
Level 2
Level 1
ns_ node-config addressing hier
7
Network Topology Link
ns_ duplex-link n0 n1 5Mb 2ms drop-tail
8
Transport
n0
n1
Port Classifier
Port Classifier
Addr Classifier
Addr Classifier
0
0
0
1
dmux_
dmux_
entry_
entry_
classifier_
classifier_
set tcp new Agent/TCP ns_ attach-agent n0 tcp
set tcpsink new Agent/TCPSink ns_ attach-agent
n1 tcpsink
ns_ connect tcp tcpsink
9
Application Traffic Generator
n0
n1
Port Classifier
Port Classifier
Agent/TCPSink
Addr Classifier
Agent/TCP
Addr Classifier
0
0
agents_
agents_
0
1
dmux_
dmux_
entry_
entry_
classifier_
classifier_
set ftp new Application/FTP ftp attach-agent
tcp ns at 1.2 ftp start
10
Routing
Agent/TCP
0
agents_
11
Routing (cont)
Agent/TCP
Agent/TCP
agents_
Link n0-n1
12
Plumbing Packet Flow
n0
n1
Application/FTP
Port Classifier
Port Classifier
Agent/TCPSink
Addr Classifier
Agent/TCP
Addr Classifier
0
0
Link n0-n1
entry_
entry_
Link n1-n0
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