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Extra info for Cisco - Introduction to IP Multicast 303
Flood everywhere initially 2. Prune back where no group members 3. Prune on redundant non-shortest path 4. Periodic reflooding Source No Receivers A B Uses Shortest Path Tree 303 1011_05F9_c3 F D RPF Fails (Normal) C E Receiver 1 Receiver 2 59 © 1999, Cisco Systems, Inc. Dense Mode PIM Example Source Link Data Control A B G C D F H E I Receiver 1 303 1011_05F9_c3 Receiver 2 60 © 1999, Cisco Systems, Inc. Cisco Systems Confidential 30 Dense Mode PIM Example Source Initial Flood of Data and Creation of State A B G D F H E I Receiver 1 303 1011_05F9_c3 Receiver 2 61 © 1999, Cisco Systems, Inc.
Does not support shared-trees • Not appropriate for… Large internetworks with a large number of senders and receivers 303 1011_05F9_c3 71 © 1999, Cisco Systems, Inc. PIM Dense Mode • Protocol Independent Supports all underlying unicast routing protocols including: static, RIP, IGRP, EIGRP, IS-IS, BGP, and OSPF • Uses reverse path forwarding Floods network and prunes back based on multicast group member information • Appropriate for... Smaller implementations and pilot networks 303 1011_05F9_c3 72 © 1999, Cisco Systems, Inc.
DVMRP—D istance V ector DVMRP—Distance DVMRP— Vector M ulticast R outing P rotocol Multicast Routing Protocol • Unicast Protocol Dependent—requires its own RIP-like, integrated unicast routing protocol • Constructs separate distribution tree for each source/group • Uses reverse path forwarding to flood-and-prune Floods:: broadcasts packets out all outgoing interfaces on distribution tree, initially assuming every branch is part of the multicast group Prune: Eliminates tree branches without multicast group members, cutting off transmission to LANs without interested receivers, also prunes redundant non-shortest paths from any receiver to the source 303 1011_05F9_c3 68 © 1999, Cisco Systems, Inc.