Ipv4 Multicast Route Protocol - Zte ZXR10 ZSR V2 Series Product Description

3.1.2

IPv4 Multicast route protocol

The multicast is a point-to-multipoint or multipoint-to-multipoint communications mode,
namely, multiple receivers receive the same information from single source.
Multicast-based applications include video conference, remote teaching, software
allocation, etc.
3.1.2.1 IGMP
The host uses Internet Group Management Protocol (IGMP) to inform the multicast router
on the network which group the router should join or leave. In this way, the multicast router
on the network knows whether a multicast group member is available on the network, and
decides whether to forward multicast packets to the network. When a multicast router
receives a multicast packet, it checks the multicast destination address of the packet, and
forward packets to the interfaces of all group members or downstream routers.
ZXR10 ZSR V2 supports IGMPv1, IGMPv2 and IGMPv3.
3.1.2.2 PIM-SM
Protocol Independent Multicast-Sparse Mode (PIM-SM) is applied to the following
situations:

Group members are extended across a wide scope.

Network bandwidth resource is limited.
PIM-SM is not dependent on a specific unicast routing protocol. Supposed that all routers
on a shared network segment do not need to send multicast packets, the router must take
the initiative to request to join a multicast group before sending and receiving multicast
packets. By setting the RP (Rendezvous Point), PIM-SM sends multicast information to all
routers supporting PIM-SM. In PIM-SM, the router explicitly joins and leaves the multicast
group to reduce the network bandwidth occupied by data packet and control packet.
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ZXR10 ZSR V2 Series Router Product Description
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