– Uninterrupted LU-LU sessions, if the supporting DLUS (SSCP) fails
– SLU init, PLU init, and Third-party init
Restrictions
The DLUR option, as implemented on the router network node, has the following
functional restrictions:
vOnly secondary LUs (SLUs) can be supported by the DLUR function. An LU
supported by DLUR cannot function as a primary LU (PLU). Therefore, the
downstream physical unit (DSPU) should be configured as secondary.
vBecause only SLUs are supported, Network Routing Facility (NRF) and Network
TerminalOption (NTO) are not supported.
vExtended recovery facility (XRF) and XRF/CRYPTO are not supported.
vYoumust be able to establish an APPN-only or APPN/HPR-only session between
DLUS and DLUR. The CPSVRMGR session cannot pass through a subarea
network.
VTAM Considerations for DLUR
The following are example VTAM Switched Major Node definitions for DLUR.You
should note that PATHstatements are necessary only if VTAM is initiating the
connection to the DSPU.
Youshould refer to

VTAM Resource Definition Reference

SC31-6427, for details of
the DLC parameter statements for the Switched Major Node definitions.
DABDLURX VBUILD TYPE=SWNET,MAXGRP=400,MAXNO=400,MAXDLUR=20
************************************************************************
*IN THE DLCADDR, THE 'SUBFIELD_ID' = CV SUBFIELD OF THE CV91 *
* MINUS 0X90. *
*FOR EXAMPLE, THE CV94 SUBFIELD IS CODED ON DLCADDR=(4,X,... *
************************************************************************
************************************************************************
* Following are PU Statements for 2.0 and for 2.1
************************************************************************
************************************************************************
* 2.0 PU STATEMENT
************************************************************************
*PU20RT PU ADDR=05,PUTYPE=2,MAXPATH=8,ANS=CONT,USSTAB=AUSSTAB,
* ISTATUS=ACTIVE,MAXDATA=521,IRETRY=YES,MAXOUT=7,
* PASSLIM=5,IDBLK=017,IDNUM=00035,MODETAB=AMODETAB
* LOGAPPL=ECHO71,DLOGMOD=M23278I1
************************************************************************
* Path statements are not required if the DSPU is initiating the
* connection to VTAM
************************************************************************
*PU20LU1 LU LOCADDR=2 11
*PU20LU2 LU LOCADDR=3
*PU20LU3 LU LOCADDR=4
************************************************************************
* 2.1 PU STATEMENT
************************************************************************
*PU21RT PU ADDR=06,PUTYPE=2,CPNAME=PU21RT,ANS=CONT,MAXPATH=8,
* ISTATUS=ACTIVE,USSTAB=AUSSTAB,MODETAB=AMODETAB
* LOGAPPL=ECHO71,DLOGMOD=M23278I 1
************************************************************************
************************************************************************
*
* Following are examples of path statement coding for various
* DLC types.
** There is no difference in the path statement definitions
* between a PU 2.0 and a PU 2.1
*
* Path statements are required if VTAM is initiating the connection
* to the DSPU.
*
************************************************************************
************************************************************************
APPN
10 MRS V3.2 Protocol Config Ref Vol2