Novell NETWARE 6-DOCUMENTATION Manual page 1473

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the Router ID, you should use the default unless you need a simpler numbering
scheme for administrating several hundred routers on an internetwork.
HINT:
If you are using an unnumbered point-to-point interface, we recommend
that you configure a unique router ID.
Optionally, OSPF can be configured to authenticate its packets by providing
an authentication key —an 8-byte, alphanumeric password—in each OSPF
packet header. OSPF authentication gives you administrative control over
which routers participate in link state exchanges on the internetwork. A router
without proper authentication is excluded from these exchanges and,
essentially, from performing any OSPF routing whatsoever. Novell TCP/IP
enables you to provide authentication for an area and to provide an
authentication key for each network to which the router is connected. By
default, authentication is turned off.
OSPF enables you to assign a cost value to each network interface you
configure. This enables you to establish a preferred route according to the type
of network media connected to the interface. For example, you might want to
increase the cost of an interface that uses a slow link so that, given the choice,
OSPF uses the interface to a faster, less costly link.
Like RIP, OSPF can run over most WAN connections, depending on which
call type you use. On-demand calls, for example, typically use static routes
instead of an active routing protocol.
IMPORTANT:
An active routing protocol, such as OSPF, should not be used on
an on-demand link because it will periodically bring up the link and will cause the
link to continue to stay up.
Permanent calls on an IP network typically use a routing protocol, such as
OSPF or RIP, to communicate routing information. However, they can also
use static routes to conserve bandwidth. OSPF can also run over a
nonbroadcast multiaccess network, such as X.25 or frame relay, but you must
provide the IP address of the peer OSPF router at the other end of each
connection.
HINT:
Novell TCP/IP enables you to run OSPF and RIP on the same router, but
under normal circumstances, you should run them separately on different
interfaces. Although an ASBR must run both protocols so that it can import RIP
routes and propagate them to other OSPF routers, you should not run both on too
many other routers in your OSPF domain. Doing so consumes additional network
bandwidth and router memory, and might even create routing loops.
The extent to which you must configure OSPF depends on the characteristics
of your network, such as its size and topology, and whether it uses other IP