module21-mcast

module21-mcast - IP Multicasting Relates to Lab 10. It...

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1 IP Multicasting Relates to Lab 10. It covers IP multicasting, including multicast addressing, IGMP, and multicast routing.
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2 Many applications transmit the same data at one time to multiple receivers Broadcasts of Radio or Video Videoconferencing Shared Applications A network must have mechanisms to support such applications in an efficient manner Applications with multiple receivers
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3 Motivation "Together, Internet broadcasting and multicasting are the next chapters in the evolution of the Internet as a revolutionary catalyst for the information age." Vint Cerf,Senior vice president of MCI/Worldcom,April 1999.
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4 Multicasting Multicast communications refers to one-to-many or many-to- many communications. IP Multicasting refers to the implementation of multicast communication in the Internet Unicast Broadcast Multicast
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5 Multicasting over a Packet Network Without support for multicast at the network layer: Multiple copies of the same message is transmitted on the same link
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6 Multicasting over a Packet Network With support for multicast at the network layer: Requires a set of mechanisms: (1) Packet forwarding can send multiple copies of same packet (2) Multicast routing algorithm which builds a spanning tree (dynamically)
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7 Semantics of IP Multicast IP multicast works as follows: Multicast groups are identified by IP addresses in the range 224.0.0.0 - 239.255.255.255 (class D address) Every host ( more precisely: interface) can join and leave a multicast group dynamically » no access control Every IP datagram send to a multicast group is transmitted to all members of the group » no security, no “floor control” The IP Multicast service is unreliable
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8 Network Interface IP IP Multicast UDP TCP Socket Layer Stream Sockets Datagram Sockets Multicast Sockets User Layer The IP Protocol Stack IP Multicasting only supports UDP as higher layer There is no multicast TCP !
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9 IP Multicasting There are three essential components of the IP Multicast service: IP Multicast Addressing IP Group Management Multicast Routing
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10 Multicast Addressing Class D 1 multicast group id 28 bits 0 1 1 All Class D addresses are multicast addresses: Class From To D 224 .0.0.0 239 .255.255.255 Multicast addresses are dynamically assigned. An IP datagram sent to a multicast address is forwarded to everyone who has joined the multicast group If an application is terminated, the multicast address is (implicitly) released.
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11 Types of Multicast addresses The range of addresses between 224.0.0.0 and 224.0.0.255, inclusive, is reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols Multicast routers should not forward any multicast datagram with destination addresses in this range. Examples of special and reserved Class D addresses, e.g,
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This note was uploaded on 03/05/2012 for the course CS 458 taught by Professor Staff during the Fall '08 term at UVA.

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module21-mcast - IP Multicasting Relates to Lab 10. It...

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