OSI/MHS Configuration and Management Manual

Planning Your OSI/MHS Subsystem
OSI/MHS Configuration and Management Manual—424827-003
3-7
How Will You Determine Route-Selection Criteria?
How Will You Determine Route-Selection
Criteria?
Route selection is part of the process of determining which path through the network a
message will take to reach its final destination. The ROUTE objects defined within the
OSI/MHS subsystem determine to which adjacent MTA a particular message will be
routed. When you configure ROUTE objects within OSI/MHS, you are actually defining
the route-selection criteria for messages based on the recipient O/R address.
To determine your route-selection criteria, you must first look at the role of this
OSI/MHS subsystem in the overall network. You should consider the following
questions:
•
What role does the OSI/MHS subsystem play in the network? (PRMD node?
ADMD node?)
•
Where is the OSI/MHS subsystem located in the network? What are the adjacent
MTAs? (Is your adjacent connection an ADMD node that connects to other parts of
the world?)
•
Will you define multiple OSI/MHS subsystems?
•
Will there be multiple adjacent MTAs?
•
Do the adjacent MTAs have single or multiple OSI addresses?
•
Where do you want to route messages? (Only within your own PRMD? Only
within your own country? To several specific countries? Everywhere?)
•
Do you need alternate routes?
•
Is hierarchical routing expected?
•
What O/R names exist in the network?
For example, if you are a PRMD and have multiple MTAs in your own network, you
may choose to have different connections between them (see Figure 3-1). You may
have only one connection to the outside world and to the network, so the routes that
you define for each MTA will be different. You must determine what role each MTA will
play.
Figure 3-1 shows a PRMD with three MTAs and an ADMD with one MTA, all within one
country. MTA2 and MTA3 send messages within their own PRMD. MTA1 sends
messages within its own PRMD, but also to the ADMD. MTA4 sends messages
between PRMD-1 and another country.