If more than one central directory server exists in the network and the value for the CDSREFER start option is 1 (the default), the network node sends all central resource registration requests to the nearest (minimal-weight route) central directory server. You can change this value if you want to disperse directory information to other central directory servers in the network. For more information about this start option, see the z/OS Communications Server: SNA Resource Definition Reference.

You can alternatively specify which central directory servers receive registration requests by using the central resource registration CDS selection function of the directory services management exit. For information about how to use this function, see the z/OS Communications Server: SNA Customization.