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EDA 1200 System Overview

address) of the multicast stream originator. This enables the use of multiple

sources of the same multicast address within the same network. It can for

example be used for different contents providers for the same multicast group.

The Internet Assigned Numbers Authority (IANA) has allocated the 232/8

address range for SSM. The following figure illustrates IANA allocation of IP

multicast addresses for the ASM and SSM address ranges.

Figure 26 IANA ASM and SSM Address Ranges

The messages used for ASM and SSM are slightly different.

3.3.2 Multicast Applications

Multicast technology can be used for different applications. The intended

application determines the requirements and desired characteristics of network.

There are three main categories of applications:

• Operator multicast services such as IPTV, radio and so on. Traffic should

be optimized using IGMP snooping in each node to reduce network load.

• TLS with Multicast. This is most likely a service for corporations and other

companies. Multicast traffic optimization by the operator is not necessary.

The TLS customer may implement optimizations mechanisms in order to

lower the load on the TLS network. From the access network point of view,

the streams are flooded across the whole TLS VLAN.

• Multicast in single edge network. This is used in network where VLAN per

End-user is used. No traffic optimization is needed in the access network

with this type of applications. The Broadband Network Gateway (BNG,

defined in TR-101) is the multicast replicator that sends the stream to each

End-user. In practice the stream can be flooded in each VLAN. This type

of application can also be used to connect to the core network when a

multicast source resides in an EDA End-user premises.

The following figure illustrates the three categories.

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APC IP DSLAM Guía de usuario Pagina 40