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Multicasting

Multicasting. AbdulRahman AbdulSalam Ahmad AlHammar Yousef Yateem. Types of Casting. Unicasting: One-to-one Easy to implement Will waste bandwidth if many people demand the same data. Broadcasting: Multicasting:. Unicasting. Types of Casting. Unicasting: One-to-one Easy to implement

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Multicasting

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  1. Multicasting AbdulRahman AbdulSalam Ahmad AlHammar Yousef Yateem

  2. Types of Casting • Unicasting: • One-to-one • Easy to implement • Will waste bandwidth if many people demand the same data. • Broadcasting: • Multicasting:

  3. Unicasting

  4. Types of Casting • Unicasting: • One-to-one • Easy to implement • Will waste bandwidth if many people demand the same data. • Broadcasting: • One-to-all • Good when all request the same data • Bad if some don’t want it • Multicasting: • One-to-group • Solves both the problems above • More complicated than the two above

  5. Multicasting

  6. The Basic Idea of Multicasting Instead of sending a separate copy of the data for each recipient, the source sends the data only once, and routers along the way to the destinations make copies as needed.

  7. Why Multicasting? • Conserves Bandwidth • Consider stats from Victoria Secrets • More than 1 million web hits during the 1st hour • 283% increase in web traffic during event. • Enhanced Efficiency: • controls network traffic and reduces CPU loads • Optimized performance: • eliminates traffic redundancy • It’s all about the Cost • more bandwidth  more costs

  8. Multicast vs. Unicast Bandwidth Usage for Clients Listening to an 8 Kbps Audio Stream

  9. Multicasting at Transport Layer • Multicasting uses UDP (User Datagram Protocol) as its underlying transport protocol. • No retransmission of packets or acknowledgment in the TL . • Any reliability must be engineered-in at higher level. • The more reliable Multicasting forms, do have negative acknowledgments.

  10. Multicasting at Network Layer(IP Multicasting) • Addressing • IP addresses Class D • Address the message to Multicast group • GroupManagement • Uses Internet Group Management Protocol (IGMP) 3.Routing • Message goes to Rendez-vous Points (RP) • RPs forward message to devices in domain and other RPs. • The Multicast Routing Protocol used is (PIM-SM)

  11. Shortest Path Tree Source Group Member 1 Group Member 2

  12. Rendezvous Point Tree RP Tree Shortest Path Trees Source 1 Rendezvous Point Source 2 Group Member 1 Group Member 2

  13. Applications that use Multicasting: • Video conferencing • Corporate communications • Distance learning • Distribution of software • Stock quotes • News

  14. Sources and refrences • http://www.savetz.com/mbone/ch3_1.html • http://en.wikipedia.org/wiki/Multicasting • http://abilene.internet2.edu/services/multicast.html • http://www.multicasttech.com/ • http://www.internet2.edu/resources/infosheetmulticast.pdf • http://mcast-wiki.internet2.edu/index.php?n=Main.MulticastCookbook • http://www.tcpipguide.com/free/t_IPMulticasting-2.htm • http://www.cisco.com/warp/public/779/largeent/learn/technologies/multicast.html. • http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/ipimt_ov.htm • http://www.answers.com/topic/multicast?method=22 • http://www.uoregon.edu/~joe/understanding-mpeg1-multicast.pdf • http://www.cisco.com/application/pdf/en/us/guest/products/ps6552/c1161/cdccont_0900aecd80310883.pdf • ftp://ftpeng.cisco.com/ipmulticast/networkers00/IntroToIPMulticast.pdf • www.iana.org/assignments/multicast-addresses. http://www.sprintlink.net/multicast/faq.html#JoiningGroups

  15. Questions

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