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Configuring IP Multicast Switching
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 20-6
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.
Video
Multicast Group
(dynamically built)
Network A
OmniSwitch AOS Release 7 Network Configuration Guide
for more information.)
OmniSwitch
Multicast Stream
(destination IP address)
Ports on end stations send
IGMP requests to receive
multicast traffic.
Network B
Example of an IPMS Network
March 2011
IPMS Overview
Source Port
Multicast Server
(source IP address)
page 20-5
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