RSUP

Reliable SAP Update Protocol

A bandwidth-saving protocol developed by Cisco to propagate services information. RSUP allows routers to reliably send standard Novell Service Advertising Protocol (SAP) packets only when the routers detect a change in advertised services. RSUP can transport network information either in conjunction with or independently of the Enhanced Interior Gateway Routing Protocol (IGRP) routing function for Internetwork Packet Exchange (IPX).