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Configuring IP Multicasting and Multimedia Services
5-2
117355-C Rev 00
MOSPF Overview
MOSPF is a multicasting extension of the OSPF protocol that allows a router to
forward multicast IP traffic within an OSPF Version 2 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 a:
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 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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