Library /sys$common/syshlp/ncphelp.hlb SET, LINE, ECHO TARGET p-address  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Applies only to FDDI lines.  Specifies the address to which the next
 echo request frame will be sent.  The default ECHO TARGET
 is 00-00-00-00-00-00.  The ECHO TARGET can be set in the volatile
 database, but it cannot be defined in the permanent database.