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Multicast Address Boundaries Overview Configuring Multicast Address Boundaries
page 5-6 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
Concurrent Multicast Addresses
Because multicast boundaries confine scoped multicast addresses to a particular domain, multicast
addresses can be used concurrently in more than one region in the network. In other words, scoped multi-
cast addresses can be reused throughout the network. This allows network administrators to conserve
limited multicast address space. The figure below shows multicast addresses 239.140.120.0 through
239.140.120.255 being used by both Multicast Domain 1 and Multicast Domain 2.
Concurrent Multicast Addresses Example
Although the same block of multicast addresses—239.140.120.0 through 239.140.120.255—is being used
in two different domains at once, multicast traffic from one domain cannot conflict with multicast traffic in
the other domain because they are effectively confined by boundaries on their corresponding interfaces. In
this case, the boundary 239.140.120.0/24 has been configured on interfaces 172.22.2.120 and 178.14.1.43.
Multicast Domain 1 Multicast Domain 2
Multicast Address Boundary
239.140.120.0/24
Multicast Address Boundary
239.140.120.0/24
VLAN 2
Router
Port
172.22.2.10
VLAN 3
Router
Port
178.14.1.43
239.140.120.x
Multicast Traffic
239.140.120.x
Multicast Traffic