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RVS Seminar SS 2002. Performance Simulation of a Multicast Protocol for Small Conferences. Today‘s Presentation. The Diploma Thesis Multicast for Small Conferences The ns-2 Network Simulation Software Status Simulation Questions / Discussion. Diploma Thesis.

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rvs seminar ss 2002

RVS Seminar SS 2002

Performance Simulation of a Multicast Protocol for Small Conferences

today s presentation
Today‘s Presentation
  • The Diploma Thesis
  • Multicast for Small Conferences
  • The ns-2 Network Simulation Software
  • Status
  • Simulation
  • Questions / Discussion
diploma thesis
Diploma Thesis
  • Performance Simulation of a Multicast Protocol for Small Conferences
  • Part I: Building/Modifying ns-2 Modules
  • Part II: Performance Simulation
multicast for small conferences
Multicast for Small Conferences

Report IAM-00-008 (T. Braun)

Topic: Definition of a scalable multicast concept that can be used for small conferencing groups in the internet (especially telephone/audio conferences).

Goal: Reduction of routing table overhead (compared to native multicast)

msc packet format
MSC packet format
  • IPv6 destination address field contains unicast address of the nearest recipient
  • an IPv6 routing header carries the unicast addresses of all other recipient plus the multicast address
msc end systems gateways
MSC end systems / gateways
  • On sending: creation of an MSC packet
  • On receiving:
    • copy the multicast address into the destination field
    • remove the routing header
    • forward to higher level protocols / local receiver group
  • if more unicast addresses are present: remove own address, re-send the packet
msc routers
MSC routers
  • Non-MSC routers: ignore routing header
  • MSC-capable routers
    • analyse destination field and routing header
    • split address list and duplicate packet if members are reached via different outgoing interfaces
    • duplicate packet if a branch occurs after a few hops - but how does the router know this?
the ns 2 network simulator
The ns-2 Network Simulator
  • De facto standard simulation software for academic research
  • Part of the VINT (Virtual InterNet Testbed) project (USC/ISI); current version developed since 1995
  • Website: http://www.isi.edu/nsnam/
ns 2 technology
ns-2 technology
  • Simulation scripts in OTcl
  • Coded in OTcl and C++
  • analysis: tracefiles
  • visualization: NAM (Network Animator)
ns 2 advantages
ns-2 advantages
  • Extensive documentation (~350 pages)
  • Some additional tutorials
    • Marc Greis’s Tutorial on ns-2
    • ns-2 by Example
  • lots of users worldwide, mailing list (archive)
  • specialized modules for LAN, mobile networking, satellite networking, ad-hoc networking
ns 2 disadvantages
ns-2 disadvantages
  • mixed coding in OTcl/C++ makes the code hard to understand
  • very few useful comments in the code
  • frequent changes in the software, documentation not always up to date
  • structure sometimes illogical (no real-world components)
completed work
Completed Work
  • PART I:
    • ns-2 agent (sender/receiver) for end system MSC simulation
    • ns-2 classifier for MSC router simulation
    • (almost) classifier to simulate an MSC/native multicast gateway
  • PART II: real-world data for the simulation (topology, delays, routing)
real world topology
Real-World Topology
  • Backbone networks: Switch, Géant (Europe), Garr (Italy), Abilene (USA)
  • End systems: University web servers
  • Delays measured using ping and traceroute from different looking glasses
  • Transformation into an ns-2 topology with 77 nodes
next step simulation
Next step: Simulation
  • Parameters: group size, group distribution (clustering), number/distribution of MSC-capable routers
  • comparison with native Multicast/explicit Multicast in terms of bandwidth usage, delay, protocol overhead
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