Luxul XMS-1024P - Manual (Page 117)

117
User Guide
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If the number of client devices is variable, Multicast transmission will be the most
efficient delivery method.
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When multiple client devices are receiving the same information form a Multicast
group, the Multicast Server sends the Multicast group information to each device
once. The client device then handles the Management of the Multicast session to
which it belongs.
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Each user can join and leave the Multicast group at any time.
Multicast Address
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Multicast IP Address:
As specified by IANA (Internet Assigned Numbers Authority) Class D IP Addresses are
used as destination addresses of Multicast packets. The Multicast IP Addresses range
from 224.0.0.0~239.255.255.255. The following table displays the range and description
of Multicast IP Addresses.
Multicast IP Address range Description
224.0.0.0～224.0.0.255 Reserved Multicast Addresses used for routing protocols
and other Network protocols
224.0.1.0～224.0.1.255 Addresses for Video Conferencing
239.0.0.0～239.255.255.255 Local Multicast Addresses which are used in the local
Network only
Table 8-1 Range of the special Multicast IP
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Multicast MAC Address:
When a unicast packet is transmitted in an Ethernet Network, the destination MAC
address is the MAC address of the receiving device. When a Multicast packet is trans-
mitted in an Ethernet Network, the destination is not a single device but a group with
a variable number of members, so a Multicast MAC Address (a logical MAC address), is
used as the destination address.
As stipulated by IANA the high-order or OID (Organizational Identifier) 24 bits of a
Multicast MAC Address will be 01-00-5E while the low-order 23 bits of a Multicast MAC
address are the low-order 23 bits of the Multicast IP Address. The mapping relationship
is described in Figure 8-2.