Service Advertising Protocol (SAP)

Definition of Service Advertising Protocol (SAP) in the Network Encyclopedia.

What is the Service Advertising Protocol?

Service Advertising Protocol, also known as SAP, is a Novell NetWare protocol that is used with Internetwork Packet Exchange (IPX) to enable file and print servers to advertise their availability to clients on a network.

Service Advertising Protocol (SAP)
Service Advertising Protocol (SAP) by Cisco

Service Advertising Protocol (SAP) periodically advertises the address of the server and the types of services it can provide to clients. It sends its advertisements by making frequent broadcasts to all machines on the local network. Routers generally forward the advertisements so that network services can be made available to machines throughout an IPX internetwork.

SAP broadcasts

The use of SAP broadcasts on IPX internetworks creates effective limits on the size of a usable IPX internetwork. However, you can configure routers to reduce unnecessary SAP traffic by

  • Filtering unnecessary SAP broadcasts using access lists on routers
  • Using Cisco Systems IPX routers that allow SAP broadcasts to contain update information only, instead of the entire SAP table, and to forward SAP updates only when a change to the SAP table has occurred

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