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Multicast Open Shortest Path First (MSOPF) is not a separate protocol, but rather is a set of extensions to Open Shortest Path First (OSPF) routing protocol. To allow OSPF to carry multicast routing information, RFC 1584 added a new Link State Advertisement (LSA) type 6 called MOSPF LSA.


Cisco does not support MOSPF.MOSPF is a set of multicast extensions to OSPF that uses LSA Type 6. By default, when a Cisco router receives a Type 6 LSA packet it will generate a "%OSPF- 4-BADLSATYPE" error message. To avoid this error message, you can configure your routers to ignore Type 6 LSA packets:


Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#router ospf 100

Router(config-router)#ospf ignore lsa mospf



MOSPF has not enjoyed a particularly wide acceptance for several reasons, mostly related to the fact that it uses a dense-mode multicast-forwarding scheme, and because it is protocol dependant. It turns out to be most useful in networks.


Also See:

Multicast Extensions to OSPF

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‎08-23-2017 12:55 PM
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I strongy disagree that MOSPF uses dense-mode for multicast forwarding.

Every MOSPF router has information about receivers (received via MOSPF LSAs) and senders (unicast routing table and multicast datagrams) so why to flood any data?