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Chapter 16. CIP Design and Configuration > Defining CSNA support - Pg. 405

CIP Design and Configuration 405 Defining CSNA support The Cisco SNA (CSNA) feature communicates with VTAM on the mainframe using the External Channel Adapter (XCA) driver of VTAM. In support of SNA, the CSNA uses a single channel address for reading and writing to the mainframe. The CSNA function utilizes the CIP virtual interface x/2 for defining internal virtual LANs used for connectivity through LLC2. Assigning CSNA to an I/O Device Address The cnsa command uses the channel path and the device address. The format of the csna interface command is as follows: csna path device [maxpiu value] [time-delay value] [length-delay value] The csna path parameter is subdivided into three arguments: logical path, channel logical address, and control unit address. · The logical path (2 hexadecimal digits) constitutes the address of the physical connection from the mainframe point of view, one hexadecimal digit for the control unit address, and one hexa- decimal digit for the device address. The PCA channel connections require the first two digits of the path value to be 01. The second two digits are configured in the IOCP generation file and should correspond to the appropriate device. · The ESCON logical-channel argument of the csna path parameter must match the ES- CON PATH input port value as defined in the IOCP generation. When using ESCON Directors, this is the port connecting to the mainframe. Without ESCON Directors (direct ESCON attach- ment to the mainframe), the logical-channel argument is 01. The IOCP/HCD macro defi-