CDSREFER start option

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                      (1)            
   .-CDSREFER--=--1--------------.   
>>-+-----------------------------+-----------------------------><
   '-CDSREFER--=--number_of_CDSs-'   

Notes:
  1. CDSREFER is meaningful only if the NODETYPE=NN and CDSERVR=NO start options are also used.

Specifies how many of the nearest central directory servers (CDS) are used for Locate searches and central resource registration. "Nearest" refers to the least-weight CP-CP session paths to a CDS. If CDSREFER=0, then all CDSs in the network are used.

You can change the value of CDSREFER with the MODIFY VTAMOPTS command while VTAM® is running.