Using SNALINK LU6.2 internal traces

The SNALINK LU6.2 internal traces are written to the location specified by the SYSPRINT statement in the SNALINK LU6.2 cataloged procedure. These traces provide information about the internals of the SNALINK LU6.2 address space.

SNALINK LU6.2 internal tracing is enabled by specifying the following statement in the SNALINK LU6.2 configuration data set:

TRACE DETAIL ALL

The SNALINK LU6.2 internal trace can also be started by passing a MODIFY console command to the SNALINK LU6.2 interface. The following MODIFY command starts internal tracing:

MODIFY procname,TRACE DETAIL ALL

In this example, procname is the member name of the cataloged procedure used to start the local SNALINK LU6.2 address space.

See the z/OS Communications Server: IP Configuration Reference for detailed descriptions of the TRACE statement parameters and the TRACE subcommand parameters.

Figure 1. SNALINK LU6.2 internal trace output

EZA5926I LU62CFG : STARTING PASS 1 OF 2
EZA5926I LU62CFG : STARTING PASS 2 OF 2
 1 EZA5927I LU62CFG : NO ERRORS DETECTED - INITIALIZATION WILL CONTINUE
EZA5932I INITIALIZATION COMPLETE - APPLID: SNAL621A  TCP/IP: TCPCS
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
 7 EZA5994I CNOS FOR INDEPENDENT PARTNER; SESSLIM=0002, WINNER=0001, LOSER=0001
EZA5984I   OLU= SNAL621A, DLU= SNAL622A, IP ADDRESS= 9.67.22.2
EZA6029E OPRCNOS  ERR. R15 00000000 R0 0000000B RTNCD 00000000 FDBK2 0000000B
EZA6030E OPRCNOS  ERR.  RCPRI= 0008,  RCSEC= 0001
EZA6031E OPRCNOS  SENSE CODE RECEIVED:  08570003
EZA6032E          SENSE CODE SPECIFIED: 00000000
EZA6023E UNABLE TO COMPLETE CNOS ON LU SNAL622A FOR 9.67.22.2
 2 EZA6009W CONVERSATIONS FOR 9.67.22.2 TERMINATED
EZA6011E UNABLE TO ALLOCATE SEND CONVERSATION FOR 9.67.22.2
 1 EZA5933I LINK SNALU62L OPENED
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
EZA5936I RECEIVE CONVERSATION ALLOCATED FOR 9.67.22.2
EZA5986I VTAM CONVERSATION ALLOCATED; CONVID= 01000011, SID= F6ABEEC3DCB90B89
EZA5984I   OLU= SNAL622A, DLU= SNAL621A, IP ADDRESS= 9.67.22.2
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
 2 EZA5935I SEND CONVERSATION ALLOCATED FOR 9.67.22.2
EZA5986I VTAM CONVERSATION ALLOCATED; CONVID= 01000012, SID= EAABEEC3D9B90C3F
EZA5984I   OLU= SNAL621A, DLU= SNAL622A, IP ADDRESS= 9.67.22.2
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
 4 EZA5992I IP DATAGRAM ADDED TO THE VTAM SEND QUEUE, LENGTH= 276, 
QUEUE COUNT = 1
EZA5985I   LU= SNAL622A, LINKNAME= SNALU62L, IP ADDRESS = 9.67.22.2
 3 EZA5988I VTAM SENT LOGICAL RECORD; CONVID= 01000012, 
SID= EAABEEC3D9B90C3F, LENGTH= 280
EZA5984I   OLU= SNAL621A, DLU= SNAL622A, IP ADDRESS= 9.67.22.2
EZA5995I NUMBER OF IP PACKETS SENT ON 9.67.22.2 = 1
 6 EZA5999I   450001140315000040014D4C09431601094301020800D58BEFBF74
0AB56D2E96EF8F85CA03EFDD80
EZA5999I   78B6FE8035FE858058EE968017DAAD8015B4AE80092C55803DA14680271B7D807DCC5
E8074502580
EZA5999I   39CDF68000F24D8023BE0E8012A9F5805434A6804C9F1D806249BE805779C5807B955
6800961ED80
EZA5999I   7C2F6E800DFF958006B006800E7ABD801C2F1E80597B65803444B6800B298D805508
CE80352D3580
EZA5999I   2B13668006AE5D80217C7E807455058079DC168060492D80644A2E804232D580175E
C6804F39FD80
EZA5999I   6831DE802206A580625B768062C0CD805FF38E806F10758021922680021D9D80664F3
E805C904580
EZA5999I   03C2D6806C906D807E04EE8075C615801FAD868039593D8011D49E801DF1E5807412
368000000000
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
EZA5997I CONNECTION 9.67.22.2 WILL TIMEOUT IN 600 SECONDS
 3 EZA5989I VTAM RECEIVED LOGICAL RECORD; CONVID= 01000011, 
SID= F6ABEEC3DCB90B89, LENGTH= 280
EZA5984I   OLU= SNAL622A, DLU= SNAL621A, IP ADDRESS= 9.67.22.2
EZA5996I NUMBER OF IP PACKETS RECEIVED ON 9.67.22.2 = 1
 6 EZA5999I   4500011402E8000040014D7909430102094316010000DD8BEFBF74
0AB56D2E96EF8F85CA03EFDD80
EZA5999I   78B6FE8035FE858058EE968017DAAD8015B4AE80092C55803DA14680271B7D807DCC5
E8074502580
EZA5999I   39CDF68000F24D8023BE0E8012A9F5805434A6804C9F1D806249BE805779C5807B955
6800961ED80
EZA5999I   7C2F6E800DFF958006B006800E7ABD801C2F1E80597B65803444B6800B298D805508C
E80352D3580
EZA5999I   2B13668006AE5D80217C7E807455058079DC168060492D80644A2E804232D580175E
C6804F39FD80
EZA5999I   6831DE802206A580625B768062C0CD805FF38E806F10758021922680021D9D80664F3
E805C904580

EZA5999I   03C2D6806C906D807E04EE8075C615801FAD868039593D8011D49E801DF1E5807412
368000000000
 5 EZA5990I IP DATAGRAM PACKED INTO MESSAGE, LENGTH= 276
EZA5985I   LU= SNAL622A, LINKNAME= SNALU62L, IP ADDRESS = 9.67.22.2
EZA5938I RECEIVED OPERATOR SHUTDOWN REQUEST
 2 EZA5937I LINK SNALU62L CLOSED
 3 EZA5989I VTAM RECEIVED LOGICAL RECORD; CONVID= 01000011, 
SID= F6ABEEC3DCB90B89, LENGTH= 280
EZA5984I   OLU= SNAL622A, DLU= SNAL621A, IP ADDRESS= 9.67.22.2
EZA5996I NUMBER OF IP PACKETS RECEIVED ON 9.67.22.2 = 1
 6 EZA5999I   4500011402E8000040014D7909430102094316010000DD8BEFBF74
0AB56D2E96EF8F85CA03EFDD80
EZA5999I   78B6FE8035FE858058EE968017DAAD8015B4AE80092C55803DA14680271B7D807DCC5
E8074502580
EZA5999I   39CDF68000F24D8023BE0E8012A9F5805434A6804C9F1D806249BE805779C5807B955
6800961ED80
EZA5999I   7C2F6E800DFF958006B006800E7ABD801C2F1E80597B65803444B6800B298D805508C
E80352D3580
EZA5999I   2B13668006AE5D80217C7E807455058079DC168060492D80644A2E804232D580175E
C6804F39FD80
EZA5999I   6831DE802206A580625B768062C0CD805FF38E806F10758021922680021D9D80664F3
E805C904580
EZA5999I   03C2D6806C906D807E04EE8075C615801FAD868039593D8011D49E801DF1E5807412
368000000000
 5 EZA5990I IP DATAGRAM PACKED INTO MESSAGE, LENGTH= 276
EZA5985I   LU= SNAL622A, LINKNAME= SNALU62L, IP ADDRESS = 9.67.22.2
EZA5938I RECEIVED OPERATOR SHUTDOWN REQUEST
 2 EZA5937I LINK SNALU62L CLOSED

Following are brief explanations of the numbered items in the output:

1

Messages written to the MVS™ system console.

2

VTAM® send and receive conversation status.

3

Information about the VTAM API interface data flow.

The VTAM interface information contains the LU type 6.2 conversation ID (Convid), the VTAM session ID (SID), length of the VTAM logical record, the origin and destination VTAM application LUs, and the home IP address.

The VTAM logical record length should be four greater than the length of the TCP/IP datagram packet to account for the VTAM logical record header.

4

Information about data received from the TCP/IP DLC connection.

Datagrams received from the SNALINK LU6.2 DLC connection are unpacked from the DLC message and added to the appropriate VTAM send queue for transmission.

5

Information about data received from the VTAM API interface.

Datagrams received from the VTAM API are packed into a DLC message buffer.

6

Hexadecimal display of data passed through the SNALINK LU6.2 address space.

There should be a hexadecimal display for every 4 and 5 event.

7

Change number of sessions (CNOS) data.

See the z/OS Communications Server: SNA Programmer's LU 6.2 Guide for more information about CNOS processing.