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 310/5/06 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