ZXR10 8900E series Core Switch Product Description
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the multicast information sent form some multicast sources and do not want to
receive information from other sources. SSM model directly builds the shortest
path tree between the multicast source and multicast data receiver, which is
highly efficient.
For ASM model, intra-domain and inter-domain multicast routing protocols are different.
Intra-domain protocol is mainly PIM protocol and inter-domain protocol uses MSDP and
MBGP protocols. For SSM model, there is no difference between intra-domain and
inter-domain protocols. As the receiver knows the location of the multicast source in
advance, multicast information can be transmitted by channel construction via PIM-SSM
protocol. Meanwhile, SSM model also needs the support of IGMPv3.
ZXR10 8900E, supporting IGMPv2, IGMPv3 and MLDv1/v2, IPv4 PIM-DM and
IPv4/v6-based PIM-SM and PIM-SSM, can provide complete multicast solutions. Besides,
to provide enhanced and more reliable multicast services and guarantee the provisioning
and operation of multicast services, 8900E also supports Multicast route guard and
anycast RP functions.
Multicast route guard can prevent unauthorized connection of multicast servers.
Designating a port as the multicast router port can allow multicast router control
messages to pass, otherwise they are discarded.
In multicast network, the existence of a single RP may become the bottleneck or Single
point of failure may occur. Anycast RP is to set multiple RPs with the same address in the
same PIM-SM domain and establish MSDP peer relation between these RPs. The
receiver originates RPT join to the nearest RP; the multicast originates registration to the
nearest RP; each RP only maintains part source/group information in PIM-SM domain
but it will exchange registration information via MSDP with other RPs. When one RP is
faulty, the new registration multicast source and the joined multicast receiver will
automatically select another near RP to perform registration and joining. Anycast RP
ensures new multicast data stream can be established between the new multicast source
and receiver at any time to realize RP load balance and backup.
3.2.5
Controllable Multicast
IPTV (Internet Protocol Television), also called network television, is a service using IP
broadband network integrated with Internet, multimedia and telecommunication
technologies to provide interactive services like live TV, video on demand and online
browsing. It transmits stream media files or service control requests on the basis of IP
and completes demand and playing of the programs. The user terminals can be IP
set-top box + television or PC.
From network implementation, IPTV can be regarded as a specific application of
controllable multicast technology. Traditional multicast technology cannot control
unauthorized multicast services and thus cannot meet the controllable and manageable
requirements of telecommunication operators. Controllable multicast technology adds
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