Customizing OSPF Multicast Extensions
117355-A Rev. A 5-3
Figure 5-1. OSPF Autonomous Systems
MOSPF supports four types of multicasting:
• Intra-area multicasting for OSPF internal routers
• Intra-area and inter-area multicasting for OSPF border routers
• Intra-area and inter-AS multicasting for OSPF boundary routers
• All multicasting types
IP0055A
External
ASBR
OSPF/
MOSPF
IR
External
network
Area 0.0.0.2
OSPF/
MOSPF
IR
OSPF/
MOSPF
IR
OSPF/
MOSPF
IR
OSPF/
MOSPF
IR
Area 0.0.0.1
Backbone
(Area 0.0.0.0)
OSPF/
MOSPF
BR
OSPF/
MOSPF
BR
Key
IR Internal router
BR Border router
ASBR Boundary router
OSPF AS
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