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IPMS Overview Configuring IP Multicast Switching
page 28-6 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006
Reserved IP 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.
IP Multicast Routing
IP multicast routing can be used for IP Multicast Switching and Routing (IPMSR). IP multicast routing is
a way of controlling multicast traffic across networks. The IP multicast router discovers which networks
want to receive multicast traffic by sending out Internet Group Management Protocol (IGMP) queries and
receiving IGMP reports from attached networks. The IGMP reports signal that users want to join a multi-
cast group.
If there is more than one IP multicast router in the network, the router with the lowest IP address is elected
as the querier router, which is responsible for querying the subnetwork for group members.
The IP multicast routing package provides the following two separate protocols:
Protocol Independent Multicast — Sparse Mode (PIM-SM) and Dense Mode (PIM-DM), which is
described in “PIM” on page 28-7.
Distance Vector Multicast Routing Protocol (DVMRP), which is described in “DVMRP” on page 28-7.
The multicast routing protocols build and maintain a multicast routing database. The multicast routing
protocols forward multicast traffic to networks that have requested group membership to a specific multi-
cast group. IPMS uses decisions made by the routing protocols and forwards multicast traffic to ports that
request group membership. See the OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide
for more information on IP multicast routing protocols.
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
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