multicast messages will be treated as broadcast messages. Thus, all members of the
LAN (or VLAN) will receive data, instead of only multicast members.
A range at the IP addresses which is used only for multicast is defined. Routers at the
network, when receiving a frame addressed to these IP addresses, will route the
frames based on multicast groups. Multicast IP addresses can be:
FF00::/8 address block is reserved for multicast;
Like at the IGMP protocol, there are addresses which are defined and cannot be used
as a multicast address:
FF01::1 – “All nodes in local interface” address, used by hosts;
FF02::2 – “All in local link” address, used by hosts;
FF02::5 – “All nodes in local site” address, used by routers.
Reserved addresses cannot be used as IP multicast addresses. In addition to the addresses shown above, there are
common services, such as PTP multicasting and NTP multicasting, that have specific addresses. Be sure that they’re
not used when configuring an IP Multicast group at the network.
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