NN

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>>-+----------------+------------------------------------------><
   '-NN--=--+-NO--+-'   
            '-YES-'     

Specifies whether the adjacent node is expected to be a network node.

If you specify a value for NN, it is validated when a connection is attempted to an adjacent node. If the adjacent CP is not the type of node that is expected, then connection setup fails. If NN is not specified, then the APPN capabilities of the adjacent node are identified and accepted when a connection is established.
NN=NO
Specifies that the adjacent node is expected to be an end node.
NN=YES
Specifies that the adjacent node is expected to be a network node.

Restriction: In a peripheral subnetwork boundary configuration between a border node and a network node without border node function, the border node appears to the non-border node as an end node. In this case, coding NN=YES on the definition statement that represents the border node, a connection failure will occur. Avoid the failure by not coding the NN operand or by coding NN=NO.