OSI/MHS Configuration and Management Manual

Troubleshooting Your OSI/MHS Subsystem
OSI/MHS Configuration and Management Manual—424827-003
9-3
Interconnection Problems With Other MTAs
the message selects the highest priority route first. After the message has been
routed, it is placed on a queue until the MR class attributes dictate that it is time to
send the message
•
The URGENT-COUNT and NON-URGENT-COUNT attributes specify how long
the queue can become—how many messages can be on the queue—before
OSI/MHS must attempt to send the message.
•
The URGENT-TIME and NON-URGENT-TIME attributes specify how long a
message can be on the queue before OSI/MHS must attempt to send it.
To send the message to an adjacent MTA, MTA 1 must determine whether it can
open another association and whether it is permitted to open an association with
the MTA defined for the route:
•
The value of the MR class attribute TOTAL_ASSOCS determines how many
associations OSI/MHS can have in progress simultaneously. If the value of the
attribute exceeds the number of outstanding incoming and outgoing
associations, then MTA 1 can attempt to establish a new association. If not,
the message is saved until a new association can be opened.
•
The value of the MTA attribute REM-LOCAL-INIT indicates whether OSI/MHS
is permitted to initiate associations with the adjacent MTA. If not, the MR
process selects the next highest priority route if one exists.
Next, the MR process checks the length of the current message to ensure that it
does not exceed the maximum size for the route (that is, the value of REM-MAX-
MSG-LEN for the adjacent MTA). If the message is too large to send on the
highest priority route, MTA 1 chooses an alternate route if one exists.
2. The MR process requests that its supporting RTS process establish an association
with the adjacent MTA. The MR process identifies the adjacent MTA and passes
the remote and local OSI addresses to be used for the link. The remote address is
determined by the following attributes in the definition of the adjacent MTA object:
REM-PSELECTOR-n,
REM-SSELECTOR-n,
REM-TSELECTOR-n,
REM-NSAP-n.
The local (calling) address consists of the values of the following MTA attributes:
LOC-PSELECTOR-n,
LOC-SSELECTOR-n,
LOC-TSELECTOR-n,
LOC-NSAP-n,
REM-NSAP-n (if the underlying connection is 1980 X.25).
You can specify up to seven links (pairs of addresses) specified for an adjacent
MTA. The MR process first tries the link where n is 1, then the link where n is 2,
and so on, until it either achieves a connection or has tried all links. (If it tries all
the links and still cannot achieve a connection, the MR process tries an alternate