z/OS Communications Server: SNA Programming
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BIND request

z/OS Communications Server: SNA Programming
SC27-3674-00

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The BIND request establishes the LU-LU session. The BIND request contains the session parameters used for the session. The two types of BIND requests are non-negotiable and negotiable. When you use the non-negotiable type, the BIND request contains the session parameters that the PLU decided to use for the session. These parameters might be the same as those suggested in the CINIT. If the SLU agrees with the session parameters, it sends a positive response to the BIND to establish a session. If the SLU does not agree with the session parameters, it rejects the request, and the LU-LU session is not established.

When the negotiable type BIND is used, if the SLU does not agree with the session parameters provided by the PLU, it can change them and return the modified parameters with its positive response. If the PLU agrees with the changes, the session has been established, and communication can begin. Otherwise, the PLU must issue a CLSDST macroinstruction to terminate the session; this causes VTAM® to send an UNBIND request to the SLU and the session is terminated.

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