
Using ISDN and DDR to Enhance Remote Access Connectivity • Chapter 5 181
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Internetwork Packet Exchange–RIP (IPX–RIP) and Service
Advertising Protocol (SAP)
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Appletalk–Routing Table Maintenance Protocol (RTMP)
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Vines–Routing Table Protocol (RTP)
Snapshot routing does not support link state routing protocols because
of the way that they exchange routing information. Link state protocols—
Intermediate System to Intermediate System Protocol (IS-IS), Open
Shortest Path First (OSPF), Netware Link Service Protocol (NLSP), and
Cisco’s Enhanced IGRP (EIGRP)—exchange information between neigh-
boring routers every 5 to 10 seconds. This update period would essentially ...