1 / 12

NS Fundamentals (contd..)

NS Fundamentals (contd..). Padma Haldar USC/ISI. Outline. Ns fundamentals – Part I (by Chen) NS fundamentals –Part II NS Internals . Ns Internals. Tcl commands translates into series of object creation plumbing of these objects

mwinston
Download Presentation

NS Fundamentals (contd..)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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. n0 n1 Port Classifier Multicast Node dmux_ Addr Classifier classifier_ Node entry Node entry dmux_ entry_ entry_ Multicast Classifier classifier_ multiclassifier_ 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. n0 n1 duplex link n1 entry_ head_ enqT_ queue_ deqT_ link_ ttl_ drophead_ drpT_ tracing simplex link Network Topology: Link [ns_ duplex-link $n0 $n1 5Mb 2ms drop-tail]

  8. dst_=0.0 dst_=1.0 Agent/TCP Agent/TCPSink agents_ agents_ 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/FTP dst_=0.0 dst_=1.0 Application: Traffic Generator n0 n1 Port Classifier Port Classifier Agent/TCPSink Addr Classifier Addr Classifier Agent/TCP 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. n0 n1 Application/FTP Port Classifier Addr Classifier n1 entry_ 0 Node entry head_ dmux_ enqT_ queue_ deqT_ link_ ttl_ 1 entry_ classifier_ drophead_ drpT_ Routing Agent/TCP 0 agents_

  11. n0 n1 Application/FTP Port Classifier Port Classifier Addr Classifier Addr Classifier 1 0 dmux_ dmux_ 0 1 entry_ entry_ classifier_ classifier_ Link n1-n0 Routing (con’t) Agent/TCP Agent/TCP agents_ Link n0-n1

  12. dst_=0.0 dst_=1.0 0 1 1 0 Plumbing: Packet Flow n0 n1 Application/FTP Port Classifier Port Classifier Agent/TCPSink Addr Classifier Addr Classifier Agent/TCP 0 0 Link n0-n1 entry_ entry_ Link n1-n0

More Related