VTAM Host Configuration Considerations for Dynamic LU Allocation

 

 

Figure 2

VTAM Host Values Defining LUSEED and LUGROUP

Example VTAM host values defining LUSEED and LUGROUP name parameters:

TN3270PU

PU

.

 

*

define other PU parameters

 

 

IDBLK=05D,

 

 

 

 

IDNUM=30001,

 

 

 

 

LUSEED=TN3X1###,

*

define the seed component of the LU names

 

 

 

 

 

created by DDDLU (e.g. LOCADDR 42 will have

 

 

 

 

 

the name TN3X1042)

 

 

LUGROUP=AGROUP

*

define the LU group name

*

 

 

 

 

 

TN3X1100

LU

LOCADDR=100,

*

define a terminal which requires a

 

 

MODETAB=AMODETAB

 

specific LU name

*

 

 

 

 

 

TN3X1101

LU

LOCADDR=101,

*

define a printer which requires a specific

 

 

DLOGMODE=M3287CS

 

LU name

Example VTAM host values defining LUGROUPname, AGROUP:

 

AGROUP

LUGROUP

 

*

define LU group to support various

 

 

 

 

 

terminal types

327802E

LU

USSTAB=USSXXX,

*

define template to support IBM 3278

 

 

LOGAPPL=TPXP001,

 

terminal model 2 with Extended Data

 

 

DLOGMOD=SNX32702,

 

Stream. Note that the USS messages in

 

 

SSCPFM=USS3270

 

USSXXX should be in 3270 datastream.

3278S2E

LU

USSTAB=USSYYY,

*

define template to support IBM 3278

 

 

LOGAPPL=TPXP001,

 

terminal model 2 with Extended Data

 

 

DLOGMOD=SNX32702,

 

Stream, for TN3270E clients requesting

 

 

SSCPFM=USSSCS

 

BIND-IMAGE.

327805

LU

USSTAB=USSXXX,

*

define template to support IBM 3279

 

 

LOGAPPL=TPXP001,

 

terminal model 5

 

 

DLOGMOD=D4C32785,

 

 

 

 

SSCPFM=USS3270

 

 

@

LU

USSTAB=USSXXX,

 

this is the default template to match any

 

 

LOGAPPL=TPXP001,

 

other terminal types

 

 

DLOGMOD=D4A32772,

 

 

 

 

SSCPFM=USS3270

 

 

With the configuration shown in Figure 2 defined in the host, the ACTPU sent by VTAM for the PU TN3270PU will have the “Unsolicited NMVT Support” set in the system services control point (SSCP) capabilities control vector. This allows the PU to dynamically allocate LUs by sending NMVT with a “Reply Product Set ID” control vector.

After the TN3270 server sends a positive response to the ACTPU, it will wait for VTAM to send ACTLUs for all specifically defined LUs. In the sample configuration shown in Figure 2, ACTLUs will be sent for TN3X1100 and TN3X1101. The server sends a positive response and sets SLU DISABLED. The LOCADDR of these LUs are put into the specific LU cache and reserved for specific LU name requests only.

To allow sufficient time for the VTAM host to send all the ACTLUs, a 30-second timer is started and restarted when an ACTLU is received. When the time expires, it is assumed all ACTLUs defined in VTAM for the PU have been sent. All LUs that have not been activated are available in a generic LU pool to be used for DDDLU unless they have been reserved by the configuration using the generic-pool deny TN3270 configuration command.

Configuring TN3270 Server on the Channel Interface Processor 9

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Cisco Systems 11.0 BT manual IDBLK=05D