A multicast routing is a networking method for efficient distribution
of one-to-many traffics. In ZStack Cloud, VPC vRouters receive
multicast information sent by multicast sources and forward the information to VM
instances to realize one-to-many connections on senders and receivers.
ZStack Cloud allows you to use VM instances as the
multicast information receivers, and to use VPC vRouters as multicast routers to
participate in the multicast routing message exchanges.
VPC vRouters support the PIM-SM/PIM-SSM protocol. In the PIM-SM protocol, RP
routers are the key devices in the PIM-SM domain. You can either manually
configure RP addresses or dynamically elect or assign RP addresses according to
the BSR mechanism.
The multicast routing topology is shown in Multicast Routing
Topology.Figure 1. Multicast Routing Topology
