Rvs seminar ss 2002
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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

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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

Questions discussion

Questions / Discussion

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