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118814-D Rev. 00
Nautica Configuration Wizard Reference Guide
OSPF Fundamentals
Using RIP to route information does have limitations; RIP, for
example, only routes over a maximum of 15 routers or hops.
Often, in larger corporations, information needs to be routed over
distances greater than 15 hops. OSPF overcomes this and many
other RIP limitations.
OSPF is set-up around areas, with the central area, or backbone,
being the common link to all areas. The basic rule of thumb with
OSPF is that all the areas need to see the backbone (Area 0), but
they do not have to see each other.
The routers that link the various areas into the backbone are
known as Area Border Routers (ABRs). An ABR is a router that
can see at least 2 other areas (one of which must be the
backbone).
OSPF can be divided into two distinct forms, Intra-Area OSPF,
where information is routed inside an area, or Inter-Area OSPF,
where information is routed between different OSPF areas.
In the table below, click on the topic for which you require further
information.
Intra-Area OSPF
Inter-Area OSPF
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