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mcast-1-post - IP-Multicast(outline Motivation and...

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Ahmed Helmy - UF 1 IP-Multicast (outline) - Motivation and Background - Multicast vs. unicast - Multicast Applications - Delivery of Multicast - Local delivery and multicast addressing - WAN delivery and its model - Group Membership Protocol (IGMP) - Multicast Algorithms and Concepts - Flooding, Spanning Tree, Reverse Path Broadcasting (RPB), Truncated RPB, Reverse Path Multicasting, Center-Based Trees
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Ahmed Helmy - UF 2 - Multicast Routing Protocols - Dense vs. Sparse Multicast - DVMRP - MOSPF - PIM (PIM-DM, PIM-SM) - Multicast and the Internet - The MBONE - Recent deployment Outline (Contd.)
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Ahmed Helmy - UF 3 Unicast vs. Multicast Multicast provides multipoint-to-multipoint communication Today majority of Internet applications rely on point-to-point transmission (e.g., TCP). IP-Multicast conserves bandwidth by replicating packets in the network only when necessary
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Ahmed Helmy - UF 4 Unicast vs. Multicast S R1 R2 R3 R4 S R1 R2 R3 R4 Multiple unicasts Multicast
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Ahmed Helmy - UF 5 Example Multicast Applications One-to-Many Scheduled audio/video distribution: lectures, presentations Push media: news headlines, weather updates Caching: web site content & other file-based updates sent to distributed replication/caching sites Announcements: network time, configuration updates Monitoring: stock prices, sensor equipment
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Ahmed Helmy - UF 6 IP Multicast Applications (contd.) Many-to-One Resource discovery Data collection and sensing Auctions Polling
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Ahmed Helmy - UF 7 Many-to-Many Multimedia Teleconferencing (audio, video, shared whiteboard, text editor) Collaboration Multi-Player Games Concurrent Processing Chat Groups Distributed Interactive Simulation IP Multicast Applications (contd.)
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Ahmed Helmy - UF 8 - Currently: The Multicast Backbone (MBONE) carries audio and video multicasts of IETF meetings, NASA space shuttle missions,.. etc.
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Ahmed Helmy - UF 9 - How do hosts know about new groups? - The Session Directory (SD) tool lists active multicast sessions on MBONE and allows to join a conference using MBONE tools: - vat (visual audio tool), rat (robust audio tool) - vic (video tool) - wb (shared white board) - nte (network text editor), .. etc.
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Ahmed Helmy - UF 10
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Ahmed Helmy - UF 11
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Ahmed Helmy - UF 12
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Ahmed Helmy - UF 13
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Ahmed Helmy - UF 14 Resource Discovery Multicast may be used (instead of broadcast) to transmit to group members on the same LAN. Multicast may be used for resource discovery within a specific scope using the TTL field in the IP header. More Applications ...
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Ahmed Helmy - UF 15 Multicast Scope Control: TTL Expanding-Ring Search to reach or find a nearby subset of a group s 1 2 3
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Ahmed Helmy - UF 16 Multicast Scope Control: Administrative TTL Boundaries to keep multicast traffic within an administrative domain, e.g., for privacy reasons an administrative domain TTL threshold set on interfaces to these links, greater than the diameter of the admin. domain the rest of the Internet
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Ahmed Helmy - UF 17 Multicast Scope Control: Administratively-Scoped Addresses an administrative domain
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