1-8Class D address range Description239.0.0.0 to 239.255.255.255 Administratively scoped multicast addresses, which are forspecific local use only.As specified by IANA, the IP addresses ranging from 224.0.0.0 to 224.0.0.255 are reserved for networkprotocols on local networks. The following table lists commonly used reserved IP multicast addresses:Table 1-3 Reserved IP multicast addressesClass D address range Description224.0.0.1 Address of all hosts224.0.0.2 Address of all multicast routers224.0.0.3 Unassigned224.0.0.4 Distance vector multicast routing protocol (DVMRP) routers224.0.0.5 Open shortest path first (OSPF) routers224.0.0.6 Open shortest path first designated routers (OSPF DR)224.0.0.7 Shared tree routers224.0.0.8 Shared tree hosts224.0.0.9 RIP-2 routers224.0.0.11 Mobile agents224.0.0.12 DHCP server/relay agent224.0.0.13 All protocol independent multicast (PIM) routers224.0.0.14 Resource reservation protocol (RSVP) encapsulation224.0.0.15 All core-based tree (CBT) routers224.0.0.16 The specified subnetwork bandwidth management (SBM)224.0.0.17 All SBMS224.0.0.18 Virtual router redundancy protocol (VRRP)224.0.0.19 to 224.0.0.255 Other protocolsLike having reserved the private network segment 10.0.0.0/8 for unicast, IANA has also reserved thenetwork segment 239.0.0.0/8 for multicast. These are administratively scoped addresses. With theadministratively scoped addresses, you can define the range of multicast domains flexibly to isolate IPaddresses between different multicast domains, so that the same multicast address can be used indifferent multicast domains without causing collisions.Ethernet multicast MAC addressWhen a unicast IP packet is transported in an Ethernet network, the destination MAC address is theMAC address of the receiver. When a multicast packet is transported in an Ethernet network, a
