High-Performance Routing

High-Performance Routing (HPR) allows the user to migrate NCP connections to APPN connections without incurring the associated increase in storage and cycles. HPR uses a rapid transport protocol (RTP) connection to transport session traffic between session endpoints. HPR routes can also traverse an existing subarea network, as HPR support provides for the mapping of HPR routes over VR-based TGs between intermediate nodes.

HPR support is available only over APPN host-to-host channel connections and other type 2.1 channel connections. To use HPR over NCP, you must have at least NCP V7R3.

To support High-Performance Routing in the configuration shown in Figure 1, modifications must be made to the switched major nodes defined in VTAM® interchange nodes SSCP1A and SSCP2A.

Figure 1. High-Performance Routing using switched SDLC connections

A diagram that shows where configuration changes need to be made when converting a configuration to enable High-Performance Routing (HPR).

In the following excerpt from switched major node SWND3AB8, defined on SSCP1A, HPR=YES indicates that SWPUAIOA provides HPR support. LLERP=NOTPREF specifies that link-level error recovery procedures are required by this PU only if the adjacent link station requires it.

*--------------------------------------------------------------------
*
*  NCP SWITCHED SDLC CONNECTION TO SSCP2A
*
*--------------------------------------------------------------------
SWPUAIOA PU    ADDR=16,IDBLK=016,IDNUM=00016,CPNAME=SSCP2A,            X
               PUTYPE=2,SIMTYPE=1,                                     X
               MAXPATH=1,MAXDATA=256,MAXOUT=1,PASSLIM=1,               X
               ISTATUS=INACTIVE,IRETRY=NO,DISCNT=YES,SSCPFM=USSSCS,    X
               ANS=CONTINUE,NETID=NETA,                                X
               CONNTYPE=APPN,CPCP=YES,HPR=YES,LLERP=NOTPREF
PATHAIOA PATH  DIALNO=PATH21E-890-3333,PID=5,GID=1,GRPNM=GP3AAIO2
SLAIAIO1 LU    LOCADDR=0,RESSCB=2,                                     X
               PACING=(1,1),VPACING=2,ISTATUS=ACTIVE

In the following excerpt from switched major node SWND4AB8, defined on SSCP2A, HPR=YES indicates that SWPU4A08 provides HPR support. LLERP=NOTPREF specifies that link-level error recovery procedures are required by this PU only if the adjacent link station requires it.

*--------------------------------------------------------------------
*
*  NCP SWITCHED SDLC CONNECTION TO SSCP1A
*
*--------------------------------------------------------------------
SWPU4A08 PU    ADDR=08,IDBLK=008,IDNUM=00008,CPNAME=SSCP1A,            X
               PUTYPE=2,SIMTYPE=1,                                     X
               MAXPATH=1,MAXDATA=256,MAXOUT=1,PASSLIM=1,               X
               ISTATUS=INACTIVE,IRETRY=NO,DISCNT=YES,SSCPFM=USSSCS,    X
               ANS=CONTINUE,NETID=NETA,                                X
               CONNTYPE=APPN,CPCP=YES,HPR=YES,LLERP=NOTPREF
PATH4A08 PATH  DIALNO=PATH21A-890-4008,PID=5,GID=1,GRPNM=GP4AAIO2
SL4A08I1 LU    LOCADDR=0,RESSCB=2,                                     X
               PACING=(1,1),VPACING=2,ISTATUS=ACTIVE
*