Service Advertising Protocol

What Does Service Advertising Protocol Mean?

Service Advertising Protocol (SAP) is an automated internetwork packet exchange (IPX) protocol component for adding and removing services. It is mostly implemented by system administrators and application developers.


SAP is a distance vector protocol that allows network services, such as file/print/gateway servers, to dynamically register data in server information tables. IPX services are then periodically broadcast across a network and its subnetworks.

Techopedia Explains Service Advertising Protocol

At startup, server operating systems (OS) broadcast SAP services to all IPX networks through SAP agents. During shutdown, SAP communicates service unavailability. Then, each SAP agent applies data and service changes for server information table maintenance.

SAP depends on IPX device collaboration. Thus, if a server fails, its associated service is removed.


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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.