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Configuring IP Multicasting and Multimedia Services
5-2
117355-D Rev 00
MOSPF Concepts and Terminology
Multicast OSPF (MOSPF) is a multicasting extension of the OSPF protocol that
allows a router to forward multicast IP traffic within an OSPF Version 2
autonomous system (AS).
An OSPF environment typically consists of an AS divided into multiple areas
connected by an OSPF backbone. You can configure an OSPF/MOSPF router
as one of the following:
Multicasting internal router (IR) that establishes neighbor relationships with
adjacent routers within an area
Multicasting border router (BR) with interfaces to one or more areas and to
the OSPF backbone
Multicasting AS boundary router (ASBR) with one or more interfaces to
external autonomous systems
Figure 5-1
shows an OSPF/MOSPF AS consisting of two OSPF areas connected
by an OSPF backbone.
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