OpenSLP libraries Service Location Protocol is an IETF standard protocol that is used to discover/advertise services on the network. You can use SLP for anything from locating a suitable printer on your floor to discovering what LDAP directories are available in your organization. This package provides the OpenSLP run-time library package that is linked to SLP aware applications. This library implements RFC 2614 - An API for Service Location. Unless there is a SLP DA in the network, you must install the slpd package to be able to advertise the services.