End node start option list

An end node is an APPN node that relies on the services of a network node to provide directory and route selection services. It does this by registering its resources to a network node server. An end node is conceptually located on the periphery of an APPN network, as shown in Figure 1.

Figure 1. VTAM end node B127 in an APPN network
A diagram that shows a VTAM end node, B127, is located on the periphery of an APPN network.

The example that follows illustrates the start options for B127. It is the combination of NODETYPE=EN and HOSTSA not coded that defines this node as a pure end node. CPCP=YES allows this end node to activate CP-CP sessions with an adjacent network node, acting as the end node's network node server. The end node is permitted to activate CP-CP sessions with only one adjacent network node (its network node server) at a time.

NETID, SSCPID, and SSCPNAME are required start options. HOSTPU is not required. However, it is recommended if you are using NetView® because NetView uses the name specified to determine which VTAM® host physical unit it is tracing. The CONFIG start option identifies a unique name of the configuration list to be activated when VTAM starts.

The CINDXSIZ start option specifies the maximum size of the CID and CONVID index tables. The new default value is 8176 bytes.

The CONNTYPE start option specifies for a type 2.1 PU whether the connection is established as a LEN connection or attempted as an APPN connection. CONNTYPE=APPN (the default value) specifies that the connection is attempted as an APPN connection.

The HPR start option specifies the level of HPR support provided by VTAM. HPR=RTP indicates that this VTAM end node provides RTP-level HPR support, meaning that it can be the endpoint of an HPR route. RTP is the default HPR value for VTAM end nodes.

The STRGR start option allows you to rename the generic resources structure. STRGR is a valid start option only on an APPN node running at least MVS™ V5R1. A sysplex environment and an MVS coupling facility are also required. If this system is part of a sysplex, and this system is being used for test purposes, STRGR=ISTGENERIC_TEST would specify ISTGENERIC_TEST as the name of the generic resource structure used by this system. The name you choose must conform to the restrictions specified in z/OS Communications Server: SNA Resource Definition Reference.

The VERIFYCP start option is used to specify whether VTAM is to perform LU-LU session-level verification during activation of LU 6.2 sessions involving control points. VERIFYCP=NONE specifies that no verification of the partner LU's identity is to take place during session activation.

The VFYRED start option specifies whether the node should attempt to perform resource verification reduction. VFYRED=YES indicates that LU 6.2 session initiation requests do not need to be delivered to the target LU. Using the VFYRED start option allows you to significantly reduce directed verification searches. For more information about the VFYRED start option, see the z/OS Communications Server: SNA Network Implementation Guide and the z/OS Communications Server: SNA Resource Definition Reference. 
*  =====> BEGINNING OF DATA SET ATCSTR27
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*   ATCSTR27 - VTAM START LIST FOR AN APPN END NODE - B127           *
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         CINDXSIZ=8176,         ** CIT & CONVT INDEX TABLE SIZE      **X
         CONFIG=27,             ** MAJOR NODE ACTIVATION CONFIG LIST **X
         CONNTYPE=APPN,         ** APPN CONNECTION TO APPN PU        **X
         CPCP=YES,              ** CP-CP SESSION                     **X
         HOSTPU=B127NPU,        ** HOST SUBAREA PU NETWORK NAME      **X
         HPR=RTP,               ** RTP-LEVEL HPR SUPPORT             **X
         NETID=NETB,            ** HOST NETWORK IDENTIFIER           **X
         NODETYPE=EN,           ** END NODE                          **X
         SSCPID=1027,           ** UNIQUE SSCP IDENTIFIER            **X
         STRGR=ISTGENERIC_TEST, ** GENERIC RESOURCES STRUCTURE       **X
         VERIFYCP=NONE,         ** PARTNER LU VERIFICATION           **X
         VFYRED=YES,            ** LU 6.2 VERIFICATION REDUCTION     **X
         SSCPNAME=B127N         ** GATEWAY SSCP NAME                 **
*  =====> END OF DATA SET ATCSTR27