IGMP- Leaving a group IGMP Leave-Group Example: R leaves from a Group2242.0.1 R R sends IgMP Leave-Group Network a to224.00.2 (ALL-ROUTERS MCAST.NET) DR dr receives it Network b DR stops forwarding packets for 224.2.0.1 to network a if R: Receiver no more 224.2.0.1 group DR: Designated Router members on networka 2021/2/11
IGMP – Leaving a group Example : R leaves from a Group 224.2.0.1 R sends IGMP Leave-Group to 224.0.0.2 (ALL-ROUTERS.MCAST.NET) DR receives it. DR stops forwarding packets for 224.2.0.1 to Network A if no more 224.2.0.1 group members on Network A. 2021/2/11 22 R DR R: Receiver DR: Designated Router IGMP Leave-Group Network A Network B
Today's Lecture Why Multicast? iP multicast service models Host-Router Signaling: IGMP Multicast Distribution Trees and Forwarding Multicast Routing protocols Reliable multicast ulticast Overlay Reading List 2021/2/11
Today’s Lecture Why Multicast? IP multicast service models Host-Router Signaling: IGMP Multicast Distribution Trees and Forwarding Multicast Routing Protocols Reliable multicast Multicast Overlay Reading List 2021/2/11 23
IP multicast routing Purpose: share Group information among routers, to implement better routing for data distribution distribution tree structure Source tree vs shared tree Routing protocols are used in conjunction with IGMP 2021/2/11
IP multicast routing Purpose: share Group information among routers, to implement better routing for data distribution Distribution tree structure Source tree vs shared tree Routing protocols are used in conjunction with IGMP 2021/2/11 24
Source distribution tree Source S Notation: (S, G) S= Source G= GI A B D F C E R Receiver 1 Receiver 2 2021/2/11 25
Source Distribution Tree 2021/2/11 25 Receiver 1 E A B D F Source Notation: (S, G) S = Source G = Group C Receiver 2 S R R
Shared distribution Tree Source S1 Notation:, G all sources G= Group Shared Root B D F S2 C E R Receiver 1 Receiver 2 2021/2/11 26
Shared Distribution Tree 2021/2/11 26 Receiver 1 E A B D F Source Notation: (*, G) * = all sources G = Group C Receiver 2 S1 R R Shared Root S2