Routing Multicast Traffic with MOSPF
Problem
You want to distribute your multicast routing tables with MOSPF.
Solution
Unfortunately, Cisco does not support MOSPF. As mentioned in the
Introduction to this chapter, 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
Router(config-router)#
65530
ospf ignore lsa mospf
Router(config-router)#end
Router#
Discussion
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 that meet several key requirements:
They should use a relatively small number of multicast applications.
These applications should have few servers and many group members, with the group members scattered throughout the network.
The network must use OSPF as its unicast protocol.
The applications should deliver a flow of multicast traffic that is neither heavy enough to cause congestion problems on the slowest links in the network, nor so light that relationships time out in the routers.
Few router vendors have implemented MOSPF. Increasingly, the multicast routing protocol ...
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