15-441 Computer Networking Inter-Domain routing BGP Border Gateway Protocol)
15-441 Computer Networking Inter-Domain Routing BGP (Border Gateway Protocol)
Review Overlay Multicast 10/5/06 ecture #12: Inter-Domain Routing 2
10/5/06 Lecture #12: Inter-Domain Routing 2 Review • Overlay Multicast
Failure of ip multicast Not widely deployed even after 15 years Use carefully -e.g, on LAn or campus, rarely over WAN Various failings Scalability of routing protocols Hard to manage Hard to implement TCP equivalent Hard to get applications to use IP Multicast without existing wide deployment Hard to get router vendors to support functionality and hard to get ISPs to configure routers to enable 10/5/06 ecture #12: Inter-Domain Routing 3
10/5/06 Lecture #12: Inter-Domain Routing 3 Failure of IP Multicast • Not widely deployed even after 15 years! • Use carefully – e.g., on LAN or campus, rarely over WAN • Various failings • Scalability of routing protocols • Hard to manage • Hard to implement TCP equivalent • Hard to get applications to use IP Multicast without existing wide deployment • Hard to get router vendors to support functionality and hard to get ISPs to configure routers to enable
Supporting Multicast on the Internet Application At which layer should multicast be implemented? P ? Network nternet architecture 10/5/06 ecture #12: Inter-Domain Routing
10/5/06 Lecture #12: Inter-Domain Routing 4 Supporting Multicast on the Internet IP Application Internet architecture Network ? ? At which layer should multicast be implemented?
IP Multicast MIT Berkeley UCSD 匚 routers CMU end systems multicast flow Highly efficient Good delay 10/5/06 ecture #12: Inter-Domain Routing
10/5/06 Lecture #12: Inter-Domain Routing 5 IP Multicast CMU Berkeley MIT UCSD routers end systems multicast flow • Highly efficient • Good delay