Operation Manual - Multicast
Quidway S3500 Series Ethernet Switches Chapter 1 IP Multicast Overview
Huawei Technologies Proprietary
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All members in the group can receive the packets. Membership of a multicast group is
dynamic, that is, hosts can join and leave groups at any time.
A multicast group can be either permanent or temporary. Part of addresses in the
multicast group is allocated by the official, known as the permanent multicast group. IP
addresses of a permanent group keep unchanged but the members in the group can
change. The number of members in a permanent multicast group can be random or
even 0. Those IP multicast addresses that are not reserved for permanent multicast
groups can be used by temporary groups.
Ranges and meanings of Class D addresses are shown in Table 1-1.
Table 1-1 Ranges and meanings of Class D addresses
Class D address
range
Meaning
224.0.0.0∼224.0.0.255
Reserved multicast addresses (addresses of permanent
groups). Address 224.0.0.0 is reserved. The other
addresses can be used by routing protocols.
224.0.1.0∼238.255.255
.255
Multicast addresses available for users (addresses of
temporary groups). They are valid in the entire network.
239.0.0.0∼239.255.255
.255
Multicast addresses for local management. They are
valid only in the specified local range.
Reserved multicast addresses that are commonly used are shown in the following
table:
Table 1-2 Reserved multicast address list
Class D address Meaning
224.0.0.0 Base Address (Reserved)
224.0.0.1 Addresses of all hosts
224.0.0.2 Addresses of all multicast routers
224.0.0.3 Unassigned
224.0.0.4 DVMRP routers
224.0.0.5 OSPF routers
224.0.0.6 OSPF DR (designated router)
224.0.0.7 ST routers
224.0.0.8 ST hosts
224.0.0.9 RIP-2 routers
224.0.0.10 IGRP routers
224.0.0.11 Mobile agents
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