95
Parameter
Description
Group Setting
MVR VLAN Select a MVR VLAN.
Group Name Configures the group name.
Start Address Configures the multicast start address.
Quantity
Configures the quantity of the multicast address.
Apply
Click
Apply
to take effect the settings.
Refresh
Click
Refresh
to begin configuring this screen afresh.
6.2.5
Multicast Address
A multicast address is associated with a group of interested receivers. According to RFC 3171,
addresses 224.0.0.0 to 239.255.255.255, the former Class D addresses, are designated as
multicast addresses in IPv4.
The IANA owns the OUI MAC address 01:00:5e, therefore multicast packets are delivered by
using the Ethernet MAC address range 01:00:5e:00:00:00 - 01:00:5e:7f:ff:ff. This is 23 bits of
available address space.
The first octet (01) includes the broadcast/multicast bit. The lower 23 bits of the 28-bit multicast
IP address are mapped into the 23 bits of available Ethernet address space. This means that there
is ambiguity in delivering packets. If two hosts on the same subnet each subscribe to a different
multicast group whose address differs only in the first 5 bits, Ethernet packets for both multicast
groups will be delivered to both hosts, requiring the network software in the hosts to discard the
un-required packets.
Class
Address Range
Supports
Class A
1.0.0.1 to 126.255.255.254
Supports 16 million hosts on each of 127
networks.
Class B
128.1.0.1 to 191.255.255.254
Supports 65,000 hosts on each of 16,000
networks.
Class C
192.0.1.1 to 223.255.254.254
Supports 254 hosts on each of 2 million
networks.
Class D
224.0.0.0 to 239.255.255.255
Reserved for multicast groups.
Class E
240.0.0.0 to 254.255.255.254
Reserved for future use, or Research and
Development Purposes.
Summary of Contents for NGI-M08C4POE8-2
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