SNAX/XF LU Network Services Manual

Building the ESS Tables
Using LUNS
2–4 097841 Tandem Computers Incorporated
Building the ESS
Tables
In planning for LUNS, you should determine how many ESS tables you need and how
you want to configure them. You have three options:
1. Create a single ESS table and specify it as the default table when a record for it is
added to the SET table. If a default ESS table exists, all SNA terminals on a
Tandem system receive the ESS message 10 and use LUNS.
2. Create one or more tables and associate them with individual terminals through
the ESSTABLE attribute of the SCF ADD LU, ADD PU, or ADD LINE command.
In this way, only those associated terminals receive the ESS message 10 and use
LUNS.
3. Create a default table, but use the ESSTABLE attribute of the SCF ADD LU, ADD
PU, or ADD LINE commands to associate certain terminals with different ESS
tables. Because the SCF attribute overrides the default table name, LUNS uses the
specified tables when processing system requests from these terminals, while
continuing to use the default table with the rest.
The last two options offer flexibility. Option 2 makes it theoretically possible for each
terminal to use a separate ESS table. Thus, you can customize each terminal, allowing
it logon access only to those processes you determine.
Logon, Logoff, and Order
Records
You create all ESS table logon, logoff, and order records with the SNAXUTL ADD
ESSCMD command. The format of this command is as follows:
ADD ESSCMD command-name , CMDTYPE command-type
command-name must contain either a character-coded command or DLU name.
(Note that the character-coded command can use either the alphabetic or single-byte
Katakana character set.)
The CMDTYPE operand command-type must always specify one of the following
values:
INITSELF-RECEIVED
specifies that the logon request is an SNA-formatted INIT-SELF and the logon
record has a command-name field containing a corresponding DLU name. A
logon record with a CMDTYPE of INITSELF-RECEIVED is used only for
passthrough sessions.
ORDER
specifies that LUNS is to establish or terminate a host SSCP-LU path.