Multicast Addresses - HP FlexFabric 5700 Series Configuration Manual

Multicast addresses

IP multicast addresses
IPv4 multicast addresses:
•
IANA assigns the Class D address block (224.0.0.0 to 239.255.255.255) to IPv4 multicast.
Table 2 Class D IP address blocks and description
Address block
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
NOTE:
Glop is a mechanism for assigning multicast addresses between different ASs. By filling an AS
number into the middle two bytes of 233.0.0.0, you get 255 multicast addresses for that AS. For more
information, see RFC 2770.
Table 3 Common permanent multicast group addresses
Address
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
Description
Reserved permanent group addresses. The IP address
224.0.0.0 is reserved. Other IP addresses can be used by
routing protocols and for topology searching, protocol
maintenance, and so on.
group addresses. A packet destined for an address in this block
will not be forwarded beyond the local subnet regardless of the
TTL value in the IP header.
Globally scoped group addresses. This block includes the
following types of designated group addresses:
•
•
Administratively scoped multicast addresses. These addresses
are considered locally unique rather than globally unique. You
can reuse them in domains administered by different
organizations without causing conflicts. For more information,
see RFC 2365.
Description
All systems on this subnet, including hosts and routers.
All multicast routers on this subnet.
Unassigned.
DVMRP routers.
OSPF routers.
OSPF designated routers and backup designated routers.
Shared Tree (ST) routers.
ST hosts.
RIPv2 routers.
Mobile agents.
DHCP server/relay agent.
Table 3
232.0.0.0/8—SSM group addresses.
233.0.0.0/8—Glop group addresses.
6
lists common permanent