IBM SC30-3865-04 - Manual (Page 333)

Before beginning the steps below, use the appropriate preceding section to
configure OSI over a LAN, X.25, or Frame Relay.
1. Enter the DN configuration process. Exit OSI config> and enter NCP> . Use the
protocol DN command.
2. Define the global DNA address. Use the define executor address command to
configure the DNA node and area number of the router.
3. Globally enable DNA. Use the define executor state command to enable the
DNA protocol to run on the router.
4. Enable inter-area routing. If the L2 routing algorithm is distance vector at level
2, use the define executor type area command to ensure that this router can
exchange DNA IV level 2 routing information.
5. Enable the DNA IV circuit. Enable the circuit that the router will use to exchange
the routing information. Use the define circuit type state on command.
DNA IV and DNA V Algorithm Considerations
DNA IV uses a distance-vector routing algorithm. DNA V can use either a
distance-vector or a link-state routing algorithm. The algorithm is selected according
to what is enabled and disabled, and combinations that can result from these two
protocols:
DNA IV disabled and OSI/DNA V enabled
This combination is considered a pure OSI/DNA V environment and the
algorithm is automatically set to link-state at both levels 1 and 2 regardless
of how the set algorithm command is configured.
DNA IV enabled and OSI/DNA V disabled
This combination is considered a pure DNA IV environment and the
algorithm is set automatically to distance-vector regardless of how the set
algorithm command is configured.
DNA IV enabled and OSI/DNA V enabled
This is a mixed environment and the algorithm information is configured and
read out of SRAM. Use the set algorithm command to configure this
information into SRAM.
Using OSI/DECnet V
Chapter 9. Using OSI/DECnet V 303