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Deployment of IP Multicast in Campus Infrastructures

Deployment of IP Multicast in Campus Infrastructures. Kevin Almeroth (almeroth@cs.ucsb.edu) UC--Santa Barbara http://www.internet2.edu/multicast/ http://www.cs.ucsb.edu/~almeroth/talks/I2-ATL-01.ppt. Outline. multicast protocols overview—see the WWW site super-brief overview

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Deployment of IP Multicast in Campus Infrastructures

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  1. Deployment of IP Multicastin Campus Infrastructures Kevin Almeroth (almeroth@cs.ucsb.edu) UC--Santa Barbara http://www.internet2.edu/multicast/ http://www.cs.ucsb.edu/~almeroth/talks/I2-ATL-01.ppt

  2. Outline • multicast protocols overview—see the WWW site • super-brief overview • state of deployment • getting started with deployment • working group activities • addendum: router configs—see the WWW site

  3. Unicast performs routing and forwarding at the same time, and in the source-to-receiver direction source

  4. Multicast Routing (and Functions) routing (path determination) [but in the reverse direction] packet forwarding and replication handling dynamic membership---path pruning/grafting source

  5. Building the Reverse Path source

  6. Building an RP Tree source

  7. Forwarding Data routing (path determination) [but in the reverse direction] packet forwarding and replication handling dynamic membership---path pruning/grafting source

  8. Question for the Ages How to find the source(s)? source source

  9. How to Find the Sources? • broadcast everywhere • receivers decide when they do not want the traffic • any source multicast (ASM) [PIM-SM/MBGP/MSDP/IGMPv2] • use a rendezvous point (RP) • receivers send joins along reverse path to RP • sources send traffic to RP • source specific multicast (SSM) [PIM/MBGP/IGMPv3] • require receivers to already know source(s) • use some out-of-band mechanism

  10. SA SA Join Join Join Join Join SA How MSDP works with PIM-SM A RP Source C D RP RP B Receiver RP MSDP peer PIM message Physical link MSDP message

  11. Join Join Join Join Join Join How SSM Works A Source C D B Receiver PIM message Physical link

  12. State of Deployment

  13. Status of the Multicast Pieces(Support for IGMPv2 & PIM-SM/MBGP/MSDP) • network: lots of vendors support multicast routing: Cisco & Juniper then Nortel, Foundry, Lucent, others, etc. • OSs/kernel: most kernels support functions (IGMPv2) • applications: • MBone tools (http://www-mice.cs.ucl.ac.uk/multimedia/software/) • IPTV, Real, MediaPlayer, and now LOTS others…

  14. Status of the Multicast Pieces(Support for IGMPv2 & PIM-SM/MBGP/MSDP) • content: • UofO (http://videolab.uoregon.edu/) • GRID (http://www-fp.mcs.anl.gov/fl/accessgrid/) • ICAIR CSPAN (http://cspan.icair.org/) • On-the-I (http://www.on-the-i.com/) • Yahoo (http://www.broadcast.com/broadband/) • NASA (http://www.nasa.gov/ntv/ntvweb.html) • UCSB (http://imj.gatech.edu/) • All the commodity traffic (sdr)

  15. Status of the Multicast Pieces(Support for IGMPv3 & SSM) • network: most vendors already support it since functionality in the core has been simplified • OSs/kernel: test kernels available • http://videolab.uoregon.edu/projects.html • applications: lots of talk, but not much action • http://videolab.uoregon.edu/projects.html • content: without supporting software/hardware, content is not there

  16. Status of Deployment • nice and stable in Abilene (since early 1999) • some commercial ISPs… • but typically service is not announced and is not supported • issues are beginning to be only political/financial (layers 8&9) • to track multicast deployment and stats… • see http://imj.ucsb.edu/mantra/ • see http://dast.nlanr.net/projects/beacon/

  17. Latest Multicast Topology

  18. The Internet2 (Abilene) Topology

  19. Site Deployment:Getting StartedandUsing Multicast

  20. Deploying Multicast Locally • experiment with multicast on a local network • try one- or few-hop multicast topology • connect to I2 • experiment with advanced applications • transition to production service

  21. Resources • I2 multicast WWW page • http://www.internet2.edu/multicast/ • I2 multicast mailing list • send email to listproc@internet2.edu with: subscribe wg-multicast Your-Name • in the body of the message • I2 multicast working group meetings • at Joint Techs meetings (http://www.ncne.nlanr.net/training/techs/)

  22. Working Group Activities • Continue robust backbone service • track deployment and use • support Source Specific Multicast (SSM) • provide support for gigapop and campus deployment • Increase deployment • campuses, international and commodity peering • provide assistance beyond the NOC

  23. Working Group Activities • Increase use of multicast • encourage campuses to offer events • advertise availability of events to non-geeks • new service to track events • Increase variety of applications • create opportunities to use multicast in novel ways • new service to track tools/applications

  24. Conclusions • Stable backbone • Key first step • Deployment in some campuses (low hanging fruit) • Working on building a robust service • More than just one-to-many packet delivery • applications, support, service, etc. • Lots of issues with legacy infrastructure

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