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2-10 TN3270 Design and Implementation Guide

solution to this problem is to use DLUR PUs or direct PUs with INCLUD0E so that VTAM passes all LU names

(static and dynamic LUs) to the CIP/CPA. As an alternative, you can code LU-SEED in the CIP to match VTAM’s

static LU names, if possible.

INCLUD0E

INCLUD0E is a VTAM parameter that can be used with direct PUs to instruct the XCA to allow the LU name

to be included in the ACTLU. If the TN3270 Server receives the LU name as part of the ACTLU, it uses this LU

name and does not relearn the name from the Bind.

The INCLUD0E is available and supported in VTAM Version 4.4. If you use INCLUD0E, you must also apply

the PTFs for the following authorized program analysis reports (APARs):

• APAR OW25501

• APAR OW31436

• APAR OW31805

LU Nailing

DDDLU and LU pooling are increasing in popularity and can be used for most LU needs. The exception,

however, isif a clientmust usea speciﬁcLU name becauseof applicationrequirements. For example,Information

ManagementSystem (IMS) applicationsuse asecurity mechanism to control accessthat isbased on theLU name.

These clients are often groupssuch as personnel departmentsor ofﬁce branches. Forthese clients therequirement

is to lock their LU to an IP address. There are two methods of locking an LU to an IP address. The ﬁrst method

is forthe client to usethe TN3270E function, which allowsthe client to specifythe LU name. Thesecond method

is to use the client LU nailing feature of the Cisco IOS software TN3270 Server feature.

LU address mapping allows a client IP address to be mapped, or “nailed,” to one or more LU local addresses on

one or more PUs. You can then control the relationship between the TN3270 client and the LU. Clients from

traditional TN3270 (non-TN3270E) devices can connect to speciﬁc LUs, which overcomes a limitation of

TN3270 devices that cannot specify a CONNECT LU. LU nailing is also useful for TN3270E clients because it

allows you to perform the conﬁguration of the client at the router, providing central control, rather than at the

client.

The “model matching” feature of the TN3270 Server is designed for efﬁcient use of dynamic LUs. Each client

speciﬁes a terminal model type at connection. When a non-nailed client connects and does not request a speciﬁc

LU, the LU allocation algorithm attempts to allocate an LU that operated with that terminal model the last time

it was used. If no such model is available, the next choice is an LU that has not been used since the PU was last

activated. Failing that, any available LU is used. For dynamic LUs, however, there is a short delay in connecting

the session.

Where a clientor set of clients is nailed to more than one LU, the same logic applies. If the conﬁgured LU nailing

maps a screen client to a set of LUs, the LU nailing algorithm attempts to match the client to a previously used

LU that was most recently used with the same terminal model type as requested by the client for this connection.

Ifa match isfound, that LUis used. Ifa match isnot found, any LU in theset that isnot currently inuse is chosen.

If there is no available LU in the set, the connection is rejected.

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Cisco 11.0 BT Manual de usuario Pagina 10