You will need to setup SLP on your Servers...
Select one Server that will become your SLPDA, or SLP Directory Agent, and type SLPDA at the Server COnsole prompt.
On the rest of the NetWare Servers, edit the SYS:ETC\SLP.CFG file. Use the following syntax when editing SLP.CFG...
DA IPV4, <IP ADDRESS OF SLPDA>
NOTE **** You may have to clear the READ-ONLY flag on the file to edit it.
Once that is completed, at the Server Console, type...
SET SLP RESET = ON
You should get back 4 messages telling you that SLP has been successfully reset and is now connected to the IP ADDRESS of the SLPDA Server.
Its that easy.
Good Luck.