Multicast Boundary
Usage Scenario
Multicast boundaries are used to control multicast information transmission by allowing the multicast information of each multicast group to be transmitted only within a designated scope. A multicast boundary can be configured on an interface to form a closed multicast forwarding area. After a multicast boundary is configured for a specific multicast group on an interface, the interface cannot receive or send multicast packets for the multicast group.
Principles
As shown in Figure 6-6, DeviceA, DeviceB, and DeviceC form multicast domain 1. DeviceD, DeviceE, and DeviceF form multicast domain 2. The two multicast domains communicate through DeviceB and DeviceD.
Interfaces 1 and Interfaces 2 in this example are GE 1/0/0, GE 2/0/0, respectively.
To isolate the data for a multicast group G from the other multicast domain, configure a multicast boundary on GE 1/0/0 or GE 2/0/0 for group G. Then, the interface no longer forwards data to and receives data from group G.
