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IPX Routing in the NetWare® Environment 6-3
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 one 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 if a router
becomes disconnected from the network 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 strategy 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 one 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. The router also periodically sends SAP broadcast
packets containing all server information known to the SAP agent. These
broadcasts synchronize all servers on the network and age those servers
that might become inaccessible because of any abnormal shut down of the
router or server.