Home

	Expand Search

DirectConnect for DB2/MVS Connectivity Guide

Appendix B: LU6.2 Sample Networks

Appendix B

This appendix contains two samples for LU6.2 networks on which MAP mainframe components, like DirectCONNECT for DB2/MVS, could run.

The first sample represents a Token Ring network running single sessions only. Conversation-level security is supported. The second sample network represents an SDLC non-switched line that supports parallel sessions. This appendix includes the following sections:

• Sample Token Ring Network
• Sample SDLC Non-Switched Line with Parallel Sessions

  Note: These samples are general. You must make appropriate changes based on your site's requirements and recommendations from your IBM representative.

Sample Token Ring Network

This section covers VTAM and CICS definitions for a sample Token Ring network. This sample uses the following names:

Token Ring Specification	Name
Host LU (CICS region)	CICSSYB
Remote LU name	SYBLU02 SYBLU03 SYBLU04
Remote LU addresses	0, 0, 0
VTAM Logon mode table name	SYSTABV
Sessions	Parallel sessions
RU size	1024
Pacing setting	5
Synch level	Confirm
Security	Verify

VTAM Entries

This section contains the VTAM Logmode entry and network definition statements.

APPL Definition Statement

This statement defines CICS region "CICSSYB" to VTAM.

Logmode Entry

This statement defines mode table "SYBTABV" to VTAM.

Network Definition (PU and LU Statements)

This statement defines your network to VTAM.

CICS Definitions

This section contains the CICS APPLID and the System Initialization Table properties and the CONNECTION and SESSION definitions.

CICS APPLID

The CICS APPLID property must be defined to VTAM as shown in "APPL Definition Statement".

System Initialization Table (SIT)

Set these properties as follows, depending on the versions of CICS you are using.

• CICS Version 3.x

  Property	Value	Notes
  ISC	YES
  TCP	YES	TCP/IP is installed.
  SEC	YES	You are using an external security manager.
  VTAM	YES	VTAM is installed.

• CICS Version 2.x:

  Property	Value	Notes
  ISC	YES
  ZCP	S$
  TCP	S$	TCP/IP is installed.
  VTAM	S$	VTAM is installed.
  EXTSEC	YES	You are using an external security manager.

CONNECTION Definition

Use the following sample as a model. Change it as appropriate to your site, noting the requirements that follow.

Requirements include the following:

• The connection and session are related by the Connection property in the Connection (OBJECT CHARACTERISTICS) and Session (SESSION IDENTIFIERS) definitions.
• The Netname property corresponds to an LU name defined to VTAM.
• Set the value of the SInglesess property to Yes for dependent LUs.
• Set the value of the AUtoconnect property to No for single sessions.
• For conversation-level security:
  • Set the value of the SEcurityname property to a user ID specified in the CICS sign-on table, or use the default sign-on table entry and enter a valid RACF ID.
  • Set the value of the ATtachsec property to Verify.

SESSION Definition

Use the following sample as a model. Change it as appropriate to your site, noting the requirements that follow.

Requirements include the following:

• The connection and session are related by the Connection property in the Connection (OBJECT CHARACTERISTICS) and Session (SESSION IDENTIFIERS) definitions.
• On the SESSION definition, set MAximum=001,000. This setting both defines one session for the LU and sets CICS as the contention loser, improving performance during session initiation (BIND).
• Set the value of the SENDSize and RECEIVESize to match the value specified in the RUSIZES property of the chosen logmode.
• AUtoconnect determines whether CICS attempts to bind sessions when the connection is established. Set the value of this property to No.

Sample SDLC Non-Switched Line with Parallel Sessions

This section covers VTAM, NCP, and CICS definitions for a sample SDLC non-switched line supporting parallel sessions. This sample uses the names in the following table.

SDLC Specification	Name
Remote LU name	NSWLU101
Remote LU addresses	0
VTAM Logmode table name	SYSTABV
Sessions	Parallel sessions
RU size	1024
Pacing setting	5
Synch level	Confirm
Security	Verify

VTAM Entries

This section contains the VTAM Logmode entry and NCP SDLC Group definition.

Logmode Entry

This statement defines mode table "SYBTABV" to VTAM.

The value for RUSIZES matches those used for SENDSize and RECEIVESize. See "SESSION Definition".

NCP SDLC GROUP Definition

Use the following sample as a model. Change it as appropriate to your site, noting the requirements that follow.

Requirements include the following:

• The MAXDATA value should match the RUSIZES defined on the chosen DLOGMOD.
• The following are MAP requirements when defining an independent LU to NCP:
  • Set the value of the XID property to YES in the PU definition.
  • Define an independent LU as LOCADDR=0. You can define more than one independent LU per PU.
  • The RESSCB property defines the number of Boundary Session Control Blocks (BSBs) reserved for this independent LU. You need one BSB for each session in which the independent LU participates.
• The LOGAPPL property is used for error recovery in case the PU becomes inactive. If you specify LOGAPPL, then when the PU is reactivated, VTAM reestablishes the SNASVCMG service session between this LU and the application defined to LOGAPPL.

See Also

• NCP/SSP/EP Resource Definition Reference to define an independent LU to NCP

CICS Definitions

To define an independent LU to CICS, use the following CONNECTION and SESSION definitions as models.

CONNECTION Definition

Use the following sample as a model. Change it as appropriate to your site, noting the requirements that follow.

To allow an independent LU to support parallel sessions, the following conditions are required:

• Set the value of the SInglesess property to No.
• Set the value of the AUtoconnect property to All. If CICS goes down, this property tells CICS to reestablish the SNASVCMG sessions with this LU.
• For conversation-level security:
  • Set the value of the SEcurityname property to a user ID specified in the CICS sign-on table, or use the default sign-on table entry and enter a valid RACF ID.
  • Set the value of the ATtachsec property to Verify.

SESSION Definition

Use this sample as a model. Change it as appropriate to your site, noting the requirements that follow.

Requirements include the following:

• To allow an independent LU to support parallel sessions:
  • Set the value of the Modename property to a logmode that supports parallel sessions; that is, set the values of bits 6 and 7 of the 11th byte of the PSERVIC property to 1.
  • Change the value of the MAximum property to xxx,yyy; where xxx is the maximum number of sessions, and yyy is the number of contention winners. For improved performance, set CICS to be the contention loser (yyy=000).
• Set the value of the AUtoconnect property to No. AUtoconnect determines whether CICS attempts to bind sessions during startup.
• Set the values of the SENDSize and RECEIVESize properties to match the value specified in the RUSIZES property of the chosen logmode.