Multiple parallel SNA NJE sessions between two nodes

SNA NJE protocols in JES2 prohibit multiple SNA sessions between two VTAM® APPLIDs. However, using multiple APPLIDs per node, each with a unique logon identifier, you can start multiple SNA NJE sessions between two adjacent nodes. You can define up to 999 unique APPLIDs and logon identifiers for each node. In the following example Figure 1, each node has three unique LOGON(n)s and three APPLID statements which can be started in parallel on three different SNA lines.

Figure 1. Parallel SNA NJE sessions between two nodes

 +---------------+                      +---------------+
 |               |                      |               |
 |  NODE1        |                      |  NODE2        |
 |               |                      |               |
 +---------------+                      +---------------+

 NJEDEF  OWNNODE=1                      NJEDEF  OWNNODE=2

 LOGON1  APPL=APN1A                     LOGON1  APPL=APN2A
 LOGON2  APPL=APN1B                     LOGON2  APPL=APN2B
 LOGON3  APPL=APN1C                     LOGON3  APPL=APN2C

 APPL(APN1A)  NODE=1                    APPL(APN1A)  NODE=1,LOGON=1
 APPL(APN1B)  NODE=1                    APPL(APN1B)  NODE=1,LOGON=2
 APPL(APN1C)  NODE=1                    APPL(APN1C)  NODE=1,LOGON=3
 APPL(APN2A)  NODE=2,LOGON=1            APPL(APN2A)  NODE=2
 APPL(APN2B)  NODE=2,LOGON=2            APPL(APN2B)  NODE=2
 APPL(APN2C)  NODE=2,LOGON=3            APPL(APN2C)  NODE=2

 LINE15  UNIT=SNA                       LINE25  UNIT=SNA
 LINE16  UNIT=SNA                       LINE26  UNIT=SNA
 LINE17  UNIT=SNA                       LINE27  UNIT=SNA
 ------------------                     -------------------
 $S LOGON1-3                            $SLOGON1-3
 $S LINE15-17                           $SLINE25-27

 $S N,A=APN2A      (generates a connection between APN1A and APN2A)

 $S N,A=APN2B      (generates a connection between APN1B and APN2B)

 $S N,A=APN2C      (generates a connection between APN1C and APN2C)