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TN3270 Server Implementation 2-7

• The host issues a deactivate physical unit (DACTPU) or disconnects the link.

• The router console is instructed to deconﬁgure the PU.

Determining How LUs Will Be Named

There are several ways in which an LU can be named and assigned to a TN3270 client. It is important to

understand how LU naming and allocation work before designing a TN3270 Server network. The same LU can

be known to VTAM with one name and to the CIP/CPA with a different name. This can be by design, but also

can be accidental, leading to client connection problems and network management problems.

The LU name assigned within the TN3270 Server is created using one of several methods. The method depends

on the conﬁguration of the TN3270 Server and the PU. PUs can be conﬁgured as either direct or DLUR-based.

• Direct—With direct PUs, the TN3270 Server LU names do not necessarily match the LU names deﬁned in

VTAM. To ensure that the LU name used in VTAM matches the LU name used by the TN3270 Server, ensure

that the conﬁguration matches. With the introduction of the function INCLUD0E within the VTAM PU

deﬁnition, VTAM will pass information regarding the real LU names to the TN3270 Server. At this time, the

Network Control Program (NCP) does not support the 0E control vector. Remote TN3270 Servers will not get

the INCLUD0E information.

• DLUR—With DLUR PUs, LU names on the TN3270 Server match names in VTAM. If you use DLUR PUs,

you always get the correct LUNAME information from VTAM. Therefore, you don’t need to specify an

LU-SEED on the router PUs.

In a multihost environment, hosts with DLUS/DLUR implemented require less conﬁguration of the PUs and LUs

on the TN3270 Server.

Other factors that impact the LU naming process are:

• Whether the LU uses DDDLU

• How the LUGROUP is conﬁgured for dynamic LUs

• How the LUSEED is speciﬁed (if at all)

• Whether INCLUD0E is used

• Whether LU nailing is used

Dynamic Deﬁnition of Dependent LUs

Most of the current offerings of TN3270 server implementation use predeﬁned pools ofLUs to support different

terminal types requested by the TN3270 clients. To simplify the management of such conﬁgurations, the Cisco

IOS software TN3270 Server feature supports a VTAM V3R4 feature, called DDDLU, which allows you to

dynamically request LUs using the terminal type provided by TN3270 clients. This feature eliminates the need

to deﬁne any LU conﬁguration in the server to support TN3270 clients emulating a generic 3270 terminal. Only

thePUs needtobe conﬁgured.Conﬁguration forLUsin theserveris necessaryonly forclientsthat requirespeciﬁc

LU names to be secured (such as printers) or use IP addresses for authorization or application selection.

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Cisco 11.0 BT Manual de usuario Pagina 7