HP 6125XLG Configuration Manual page 42

Figure 15 Changing an RPF route
As shown in
back to the source is Switch A, and the multicast data from the source travels through Switch A to Switch
C. When a static multicast route is configured on Switch C with Switch B as its RPF neighbor on the path
back to the source, the multicast data from the source travels along the path: Switch A to Switch B and
then to Switch C.
Creating an RPF route
When a unicast route is blocked, multicast forwarding might be stopped due to lack of an RPF route. In
this case, you can create an RPF route by configuring a static multicast route for a given multicast source,
so that a multicast routing entry is created to guide multicast forwarding.
Figure 16 Creating an RPF route
Multicast Routing Table Static on Switch C
Source/Mask
192.168.0.0/24
Multicast Routing Table Static on Switch D
Source/Mask
192.168.0.0/24
Source
192.168.0.1/24
Multicast packets
As shown in
no static multicast route is configured, the receiver hosts in the OSPF domain cannot receive the multicast
packets from the multicast source in the RIP domain. If you configure a static multicast route on Switch C
Figure 15, when no static multicast route is configured, Switch C's RPF neighbor on the path
Interface RPF neighbor/Mask
Vlan-int10 1.1.1.1/24
Interface RPF neighbor/Mask
Vlan-int20 2.2.2.2/24
RIP domain
Switch A Switch B
Figure 16, the RIP domain and the OSPF domain are unicast isolated from each other. When
OSPF domain
Switch D
Vlan-int10 Vlan-int10
1.1.1.1/24 1.1.1.2/24
Switch C
Multicast static route
35
Receiver
Vlan-int20
2.2.2.1/24
Vlan-int20
Receiver
2.2.2.2/24