Sample console

The example in Figure 1 and the accompanying information illustrate SNALINK operation.

The line number notations in the example have been added for clarity. They do not appear in the console output.

Figure 1. SNALINK console example

Line 1              | Init complete, APPLID SNALKB03, TCPIP id TCPIPB
Line 2              | Maximum RU size is 00000600
Line 3     SNALKC04 | DLC path 00000001 pending
Line 4     SNALKC04 | Ready to accept bind from remote LU
Line 5     SNALKA04 | DLC path 00000002 pending
Line 6     SNALKA04 | Sending BIND request for SNA send session
Line 7     SNALKA04 | OPNDST   CHECK err. R15 00000004 R0 00000010 RTNCD 00000010 FDBK2 00000000
Line 8     SNALKA04 | OPNDST   sense: SSENSEI,SSENSMI,USENSEI: 00000000
Line 9     SNALKA04 | DLC path 00000002 pending
Line 10    SNALKA04 | Sending BIND request for SNA send session
Line 11    SNALKA04 | OPNDST   CHECK err. R15 00000004 R0 00000010 RTNCD 00000010 FDBK2 00000000
Line 12    SNALKA04 | OPNDST   sense: SSENSEI,SSENSMI,USENSEI: 00000000
Line 13    SNALKC04 | Received BIND request for SNA receive session
Line 14    SNALKC04 | Sending BIND request for SNA send session
Line 15    SNALKC04 | SNA receive session established
Line 16    SNALKC04 | SNA send session established
Line 17    SNALKC04 | Accepting DLC path 00000001
Line 18    SNALKA04 | DLC path 00000002 pending
Line 19    SNALKA04 | Sending BIND request for SNA send session
Line 20    SNALKA04 | SNA send session established
Line 21    SNALKA04 | Accepting DLC path 00000002
Line 22    SNALKA04 | Received BIND request for SNA receive session
Line 23    SNALKA04 | SNA receive session established
Line 24    SNALKC04 | NSEXIT CLEANUP request for receive session
Line 25    SNALKC04 | RECEIVE  CHECK err. R15 00000004 R0 0000000C RTNCD 0000000C FDBK2 0000000B
Line 26    SNALKC04 | RECEIVE  sense: SSENSEI,SSENSMI,USENSEI: 00000000
Line 27    SNALKC04 | DLC path 00000001 pending
Line 28    SNALKC04 | Ready to accept bind from remote LU
Line 29    STOP SNALINK
Line 30             | Received STOP command, shutting down

Line number: Description
Lines 1 and 2: SNALINK displays its startup information from its command line parameters, which are customized as described in z/OS Communications Server: IP Configuration Reference. The maximum RU size and all other values are displayed in hexadecimal.
Lines 3 and 4: The TCPIP address space, TCPIPB, issues a DLC CONNECT to establish a session with the remote LU SNALKC04. SNALKC04 is higher in the collating sequence than the local LU name SNALKB03. Consequently, SNALKB03 takes the passive role in connecting to SNALKC04, and waits for SNALKC04 to establish a session.
Lines 5 and 6: TCP⁄IP issues another DLC CONNECT to establish a session with SNALKA04. In this case, SNALKA04 is lower in the collating sequence. Consequently, SNALKB03 takes an active role in connecting to SNALKA04.
Lines 7 and 8: The session establishment attempt to SNALKA04 has failed, as indicated by the (nonzero) return code and the sense information printed.
Lines 9 through 12: Thirty seconds later, TCP⁄IP again tries to connect to SNALKA04.
Lines 13 and 14: SNALINK receives a BIND request from SNALKC04. SNALINK calls the resulting session the receive session, because it is used only to send data from SNALKC04. Now that the active end has initiated communication, SNALKB03 as the passive end, sends a BIND request to establish a send session.
Lines 15 through 17: The send and receive sessions are fully established. Establishment of the send session causes SNALINK to accept the corresponding DLC path.
Lines 18 through 23: TCP⁄IP again tries to connect to SNALKA04. This time it is successful (success is indicated by no nonzero return codes).
Lines 24 through 26: SNALKC04 terminates its sessions, and various error messages result.
Lines 27 and 28: Thirty seconds later, TCP⁄IP again tries to establish communication with SNALKC04. As in lines 13 and 14, SNALKB03 is the passive partner.
Lines 29 and 30: The operator issues a STOP SNALINK command, which causes SNALINK to stop. All DLC paths and SNA sessions are ended.