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Can another definition for an OPSF area be: A multicast domain within a larger autonomous system that is primarily subject to a single LSDB (topology database)?

//edit I'll modify my definition soon.

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    I wouldn't base it on a multicast domain since that might have a different range - an OSPF area can be both larger and smaller than the actual multicast domain(s).
    – Zac67
    Mar 27 at 6:56
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    You can have an OSPF area that may only have some multicast links or does not use multicast at all. Only an OSPF link on a broadcast medium may use multicast, and an OSPF area probably includes many links. The link-local multicast that OSPF may use will not cross a router, so even if all the links are broadcast media, there could be many multicast domains in an OSPF area. On NBMA links, OSPF uses unicast, and it can even be configured to use unicast on a broadcast medium.
    – Ron Maupin
    Mar 27 at 11:29

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