IPMS Overview Configuring IP Multicast Switching
page 32-6 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
IPMS Overview
A multicast group is defined by a multicast group address, which is a Class D IP address in the range
224.0.0.0 to 239.255.255.255. (Addresses in the range 239.0.0.0 to 239.255.255.255 are reserved for
boundaries.) The multicast group address is indicated in the destination address field of the IP header. (See
“Reserved IP Multicast Addresses” on page 32-7 for more information.)
IPMS tracks the source VLAN on which the Internet Group Management Protocol (IGMP) requests are
received. The network interfaces verify that a multicast packet is received by the switch on the source (or
expected) port.
IPMS Example
The figure on the following page shows an IPMS network where video content can be provided to clients
that request it. A server is attached to the switch that provides the source (i.e, multicast) IP addresses.
Clients from two different attached networks send IGMP reports to the switch to receive the video content.
Example of an IPMS Network
Video
OmniSwitch
Network A
Network B
Multicast Server
(source IP address)
Multicast Stream
(destination IP address)
Ports on end stations send
IGMP requests to receive
multicast traffic.
Source Port
Multicast Group
(dynamically built)
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