Configuring TN3270 on a Channel Interface Processor
Note To enable the TN3270 server feature, you must have a CIP installed in a Cisco 7000 family router. The TN3270 server is different from the TN3270 terminal emulation access feature described in the “Configuring TN3270” chapter of the Access Services Configuration Guide .
Configuring TN3270 on a Channel Interface Processor
The following sections describe additional features of TN3270 server support on the CIP. The features discussed include the following:
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Dynamic LU Allocation
Formation of LU Model Type and Number
Specific LU Allocation
SNA Session
Multiple Hosts Support
You will also need to understand the following information before proceeding with TN3270 configuration tasks:
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VTAM Host Configuration Considerations for Dynamic LU Allocation
TN3270 Configuration Modes
Dynamic LU Allocation
This will be the most common form of request from TN3270 clients emulating a TN3270 terminal. The user typically wants to specify emulating a particular terminal type and normally is not interested in what LOCADDR or LU name is allocated by the host, as long as a network solicitor logon menu is presented. The server will perform the following on such a session request:
•Form an EBCDIC string based on the model type and number requested by the client (see “Formation of LU Model Type and Number” for the algorithm used). This string is used as a field in a Reply product set ID (PSID) network management vector transport (NMVT).
•Allocate a LOCADDR from the next available LU in the generic LU pool. This LOCADDR is used in the NMVT.
•Send the formatted Reply PSID NMVT to VTAM.
When VTAM receives the NMVT, it will use the EBCDIC model type and number string to look up an LU template under the LUGROUP. For example, the string “327802E” will find a match in the sample configuration shown in Figure 2. An ACTLU will be sent and a terminal session with the model and type requested by the client is established.
Formation of LU Model Type and Number
VTAM requires a model type and number from the Reply PSID NMVT to use as a key to look up in the LU group to find an LU template. The model type is a four character string; the model number is a two or three character string. The server will accept the following formats of terminal type string from the client:
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6Configuring TN3270 Server on the Channel Interface Processor
