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2-12 TN3270 Design and Implementation Guide

Note: If the LUSEED is not conﬁgured in VTAM, then you cannot use the DDDLU function.

LU Selection Algorithm

When a user requests an LU from the LU pool, an allocation algorithm that reuses resources is used. The

algorithm gives preference to LUs that are already active, provided the last use was with the same model as the

new client. In the following two situations the algorithm will choose an LU that has not been used before:

• If the used LU was last used with a different model.

• If the last time the LU was used there was a failure on the mainframe side (a time-out occurred while getting

the ACTLU or Bind/USS10). If such a failure occurs, the LU is moved to the “bad” list.

Figure 2-3 illustrates the decision process used by the LU selection algorithm.

DDDLU,LUSEED on SWMN,

DLUR PU

The LU-SEED parameter on the channel-attached router cannot be

conﬁgured under DLUR. Therefore, the LU names must be created in VTAM

based on the VTAM LUSEED parameter. The TN3270 Server learns the LU

names from VTAM.

DDDLU,LUSEED on SWMN,

INCLUD0E on direct PU

The LU names are created in VTAM based on the VTAM LUSEED

parameter. The TN3270 Server learns the LU names from VTAM.

DDDLU,LUSEED on SWMN,

direct PU without INCLUD0E

If you use the LU-SEED parameter on the channel-attached router, the LU

names on the router are created according to the LU-SEED parameter. The

LU names in VTAM are created according to VTAM LUSEED parameter.

This means that the LU names might not match. It is a good idea to make

LU-SEED parameters on the router and in VTAM identical. However, the

TN3270 Server will learn the name of the LU from the ﬁrst Bind received (if it

carries the SLU name).

If you do not use the LU-SEED parameter on the channel-attached router, the

LU names on the router default to the ﬁrst six characters of the conﬁgured PU

followed by the two-byte hexadecimal number of the respective LOCADDR

of this LU. If you want the LU names to be identical on the router and in

VTAM, you must create the VTAM LU names according to the naming

convention described above.

Factors How the Name Is Assigned

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Cisco 11.0 BT Manual de usuario Pagina 12