CORNELL CS 5190 - IP Multicast (69 pages)

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IP Multicast



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IP Multicast

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Pages:
69
School:
Cornell University
Course:
Cs 5190 - Computer Networking

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17 IP Multicast Last Modified 01 14 19 12 02 AM Based on slides by Gordon Chaffee Berkeley Multimedia Research Center URL http bmrc berkeley edu people chaffee 4 Network Layer 4a 1 Outline IP Multicast Multicast routing Design choices Distance Vector Multicast Routing Protocol DVMRP Core Based Trees CBT Protocol Independent Multicast PIM Border Gateway Multicast Protocol BGMP Issues in IP Multicast Deplyment 4 Network Layer 4a 2 What is multicast 1 to N communication Nandwidth conserving technology that reduces traffic by simultaneously delivering a single stream of information to multiple recipients Examples of Multicast Network hardware efficiently supports multicast transport Example Ethernet allows one packet to be received by many hosts Many different protocols and service models Examples IETF IP Multicast ATM Multipoint 4 Network Layer 4a 3 Unicast Problem Sender Sending same data to many receivers via unicast is inefficient Example R Popular WWW sites become serious bottlenecks 4 Network Layer 4a 4 Multicast Efficient one to Sender many data distribution R 4 Network Layer 4a 5 IP Multicast Introduction Efficient one to many data distribution Tree style data distribution Packets traverse network links only once Location independent addressing IP address per multicast group Receiver oriented service model Applications can join and leave multicast groups Senders do not know who is listening Similar to television model Contrasts with telephone network ATM 4 Network Layer 4a 6 IP Multicast Service All senders send at the same time to the same group Receivers subscribe to any group Routers find receivers Unreliable delivery Reserved IP addresses 224 0 0 0 to 239 255 255 255 reserved for multicast Static addresses for popular services e g Session Announcement Protocol 4 Network Layer 4a 7 Internet Group Management Protocol IGMP Protocol for managing group membership IP hosts report multicast group memberships to neighboring routers Messages in IGMPv2 RFC 2236



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