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IPMS Overview
Configuring IP Multicast Switching
page 23-4
OmniSwitch 6624/6648 Network Configuration Guide
April 2004
Reserved Multicast Addresses
The Internet Assigned Numbers Authority (IANA) created the range for multicast addresses, which is
224.0.0.0 to 239.255.255.255. However, as the table below shows, certain addresses are reserved and
cannot be used.
IGMP Version 3
IGMP is used by IPv4 systems (hosts and routers) to report their IP multicast group memberships to any
neighboring multicast routers. IGMP version 2 (IGMPv2) handles forwarding by IP multicast destination
address only. IGMP version 3 (IGMPv3) handles forwarding by source IP address and IP multicast desti-
nation address. OmniSwitch 6600 Series switches support IGMPv2 and IGMPv3.
Note.
See
“Configuring the IGMP Proxy Version” on page 23-6
for information on configuring the IGMP
version.
In IGMPv2, each membership report contains only one multicast group. In IGMPv3, membership reports
contain many multicast groups up to the Maximum Transmission Unit (MTU) size of the interface.
IGMPv3 uses source filtering and reports multicast memberships to neighboring routers by sending
membership reports.
Address or Address Range
Description
224.0.0.0 through 224.0.0.255
Routing protocols (e.g., OSPF, RIP2)
224.0.1.0 through 224.0.1.255
Internetwork Control Block (e.g., RSVP, DHCP, commer-
cial servers)
224.0.2.0 through 224.0.255.0
AD-HOC Block (e.g., commercial servers)
224.1.0.0 through 224.1.255.255
ST Multicast Groups
224.2.0.0 through 224.2.255.255
SDP/SAP Block
224.252.000.000 through 224.255.255.255
DIS Transient Groups
225.000.000.000 through 231.255.255.255
Reserved
232.000.000.000 through 232.255.255.255
Source Specific Multicast
233.000.000.000 through 233.255.255.255
GLOP Block
234.000.000.000 through 238.255.255.255
Reserved
239.000.000.000 through 239.255.255.255
Administratively Scoped