Modify the default values for optional parameters.

     SET DEFAULT
         [ DIRECTORY_SERVICE dir-service ]
         [ DISPLAY_MODE display-mode ]
         [ NSAP_FORMAT format ]
         [ PHASEIV_PREFIX addr-prefix ]
         [ REVERSE_DIRECTORY rev-dir-name ]
         [ SYNONYM_DIRECTORY syn-dir-name ]

 This provides a means to preset the values for commonly used parameters,
 such as the reverse address mapping directory name to use for a particular
 directory service.

 This is particularly useful when done in a DECNET_REGISTER initialization
 command file (see "HELP USAGE INITIALIZATION_COMMAND_FILE").

1  –  DEFAULT

 This keywork is required.  It indicates that default parameter values
 are being modified.

 See the SET topic for a general description of the SET DEFAULT command.

2  –  DIRECTORY_SERVICE

 This specifies the directory service to use as the default, when the
 command does not specify a directory service.

     DIRECTORY_SERVICE dir-service

 The service must be one of:

     DIRECTORY_SERVICE LOCAL
     DIRECTORY_SERVICE DECDNS
     DIRECTORY_SERVICE PHASEIV

 If other parameters are specified in the command, this also determines
 the directory service that those additional default value parameters
 apply to.  For example:

     SET DEFAULT DIRECTORY_SERVICE DECdns REVERSE_DIR .DNA_BackTranslation

3  –  DISPLAY_MODE

 This specifies the default display mode to use when the mode is not
 explicitly requested in the command.  The following display modes are
 provided.

     DISPLAY_MODE NAMES     Display only the names
     DISPLAY_MODE BRIEF     Display names and addresses
     DISPLAY_MODE FULL      Display and error check all information

 For example:

     SET DEFAULT DISPLAY_MODE FULL

 See the SHOW DISPLAY-MODE topic for more information on each mode.

4  –  NSAP_FORMAT

 This specifies the default NSAP display format to use when the format is
 not explicitly requested in the command.  The following display formats
 are provided.

     NSAP_FORMAT DNA       Use DNA format
     NSAP_FORMAT OSI       Use OSI format

 For example:

     SET DEFAULT NSAP_FORMAT OSI

 See the SHOW NSAP_FORMAT topic for more information on these display
 formats.

5  –  PHASEIV_PREFIX

 This specifies the default AFI, IDI, and preDSP to use when constructing
 an NSAP from a Phase IV address.  This is used when a Phase IV address
 is specified in an address tower, and an explicit Phase IV prefix is not
 specified.

     PHASEIV_PREFIX addr-prefix

 For example:

     SET DEFAULT PHASEIV_PREFIX 39:840:800AB738

 See the PHASE_IV_PREFIXES topic for details about Phase IV prefix
 values.

6  –  REVERSE_DIRECTORY

 This specifies the default base directory or name entry to use for the
 reverse address mapping links to the node name (also called the back
 translation links).

     REVERSE_DIRECTORY rev-dir-name

 The links under this directory are used to map NSAP values to their
 respective node names.  These directories are used only for the DECdns
 directory service.

 For example:

     SET DEFAULT DIRECTORY_SERVICE DECDNS REVERSE_DIR .DNA_BackTranslation

 For more information, please refer to the NAMES_AND_DIRECTORIES topic.

7  –  SYNONYM_DIRECTORY

 This specifies the default base directory or name entry to use for the
 synonym mapping link to the node name.

     SYNONYM_DIRECTORY syn-dir-name

 The links under this directory are used to map Phase IV synonyms to
 their respective node names.  These directories are used only for the
 DECdns directory service.

 For example:

     SET DEFAULT DIRECTORY_SERVICE DECDNS SYNONYM_DIR .DNA_NodeSynonym

 For more information, please refer to the NAMES_AND_DIRECTORIES topic.