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2-2 TN3270 Design and Implementation Guide

Figure 2-1 TN3270 Session Overview

Hardware and Software Requirements

This section provides information about the hardware and software required to use the TN3270 Server. For

additional information about what is supported in the various releases of the Cisco IOS software and the CIP

microcode, see the information on CCO.

Router Software Requirements

The TN3270 Server consists of a system image and a new microcode image. These are bundled as one combined

image. The TN3270 Server feature was ﬁrst included in the Cisco IOS Release 11.0BT special release. It is also

included in release 11.2 and later. LU nailing, the process of mapping an IP address to an LU, was ﬁrst included

in the Cisco IOS Release 11.3.

Router Hardware Requirements

The CIP hardware microcode must be CIP22-23 or later. The CPA hardware level must be CIP26-2 or later with

Cisco IOS Release 11.3T or later.

Mainframe Requirements

The hosts communicating via SNA with the TN3270 Server must be running VTAM V4R2. You can use VTAM

V3R4, but DLUR operation is not supported in V3R4 and proper Dynamic Deﬁnition of Dependent LU

(DDDLU) operation may require program temporary ﬁxes(PTFs)to be applied to VTAM. We recommend using

VTAM V4R2.

TN3270 Client Requirements

Based on the RFC standards, the Cisco TN3270 Server will work with any client that implements the TN3270

or TN3270E protocols.

Planning for Implementation

Thissectiondiscussesthe followingconsiderations thatmust beaddressed beforeimplementing aTN3270 Server

in your network:

• Where to Place the TN3270 Server and How Many Servers You Need

• Implementing TN3270 Server on a CIP/CPA

• Deﬁning PUs

TN3270

Server

TCP/IP

VTAM Applications

VTAM

CIP Router

Client Session Flow

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Cisco 11.0 BT Manual de usuario Pagina 2