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IPX Routing in the NetWare Environment 5-3
Routing
Information
Protocol (RIP)
RIP allows the exchange of routing information on a NetWare network. IPX
routers use RIP to dynamically create and maintain their routing tables.
RIP allows a router to exchange routing information with a neighboring
router. As a router becomes aware of any changes in the network layout,
it broadcasts this information to any neighboring routers. IPX routers also
send periodic RIP broadcast packets containing all routing information
known to the router. These broadcasts synchronize all routers on the
network and age those networks that might become inaccessible due to a
router going down abnormally.
Service Advertising
Protocol (SAP)
SAP provides routers and servers (that contain SAP agents) with a means of
exchanging network service information.
Through SAP, servers advertise their services and addresses. Routers gather
this information and share it with other routers. This allows routers to
dynamically create and maintain a database (server table) of network
service information. Clients on the network can determine what services are
available and obtain the network address of the nodes (servers) where they
can access those services. Clients require this information to initiate a
session with a file server.
SAP allows a router to exchange information with a neighboring SAP agent.
As a router’s SAP agent becomes aware of any change in the network server
layout, it immediately broadcasts this information to any neighboring SAP
agents. SAP broadcast packets containing all server information known to
the SAP agent are also periodically sent. These broadcasts synchronize all
servers on the network and age those servers that might become
inaccessible due to any abnormal shut down of the router or server.