Ip Multicast Features - 3Com 3032 Configuration Manual

500 C 33: IP M
HAPTER ULTICAST

IP Multicast Features

Class D address is 1110, the range of the multicast addresses is from 224.0.0.0 to
239.255.255.255.
The multicast group can be either permanent or temporary. The permanent group
has a constant group address assigned by IANA, while the number of members in
the group can be random, even zero. Temporary multicast groups can use that
group address, which is not reserved, but the number of members in the
temporary multicast group cannot be zero.
The range and meaning of Class D address are as follows:
Table 574 Range and Meaning of Class D Addresses
Class D address range
224.0.0.0 to 224.0.0.255
224.0.1.0 to 238.255.255.255
239.0.0.0 to 239.255.255.255
The reserved multicast addresses, which are frequently used, are as follows:
Table 575 List for Reserved Multicast Addresses
Class D address range
224.0.0.0
224.0.0.1
224.0.0.2
224.0.0.3
224.0.0.4
224.0.0.5
224.0.0.6
224.0.0.7
224.0.0.8
224.0.0.9
224.0.0.11
224.0.0.12
224.0.0.13
224.0.0.14
224.0.0.15
224.0.0.16
224.0.0.17
224.0.0.18
......
The multicast protocol changes the Class D address into the hardware/media
address. For example, in an Ethernet MAC address, the range of the reserved
corresponding Ethernet addresses that IANA obtains the IEEE-802 MAC is from
01-00-5e-00-00-00 to 01-00-5E-ff-ff-ff.
In simple TCP/IP routing, the path of a data packet transmission is from the source
address to the destination address following the principle of hop-by-hop. But in
Meaning
Reserved multicast address (Permanent group
address)
Subscriber available multicast address (Temporary
group address)
The multicast address not managed or at specific
locations
Meaning
Reference addresses (reserved)
All systems on this subnet
All routers on this subnet
Not for distribution
DVMRP routers
OSPF routers
OSPF DR
ST routers
ST hosts
RIP-2 routers
Active agents
DHCP Server/trunk agent
All the PIM routers
RSVP encapsulation
All the CBT routers
Assigned SBM
All the SBMS
VRRP
......