In Solaris SLP, you deploy a DA by changing the default setting for the net.slp.isDA property in the host's slp.conf file, then stopping and restarting slpd. This causes slpd to start as a DA. You can assign only one DA per host.
How to Deploy a DA
Become superuser.
Edit the /etc/inet/slp.conf file and set the net.slp.isDA property to true.