Chapter 9: IPX Routing Configuration Guide152 SmartSwitch Router User Reference Manualthis information is immediately broadcast to any neighboring routers. Routers also sendperiodic RIP broadcast packets containing all routing information known to the router.The SSR uses IPX RIP to create and maintain a database of internetwork routinginformation. The SSR's implementation of RIP allows the following exchanges ofinformation:• Workstations locate the fastest route to a network number by broadcasting a routerequest.• Routers request routing information from other routers to update their own internaltables by broadcasting a route request.• Routers respond to route requests from workstations and other routers.• Routers perform periodic broadcasts to make sure that all other routers are aware ofthe internetwork configuration.• Routers perform broadcasting whenever they detect a change in the internetworkconfigurations.SSR's RIP implementation follows the guidelines given in Novell's IPX RIP and SAPRouter Specification Version 1.30 document.SAP (Service Advertising Protocol)SAP provides routers with a means of exchanging internetwork service information.Though SAP, servers advertise their services and addresses. Routers gather thisinformation and share it with other routers. This allows routers to create and dynamicallymaintain a database of internetwork service information. SAP allows a router to exchangeinformation with a neighboring SAP agent. As a router becomes aware of any change inthe internetwork server layout, this information is immediately broadcast to anyneighboring SAP agents. SAP broadcast packets containing all server information knownto the router are also sent periodically.The SSR uses IPX SAP to create and maintain a database of internetwork serviceinformation. The SSR’s implementation of SAP allows the following exchanges ofinformation:• Workstations locate the name and address of the nearest server of certain type• Router’s request for the names and addresses of either all or certain type of servers• Response to workstation or router’s request• Periodic broadcast to make sure all other routers are aware of the internetworkconfiguration• Perform broadcasting whenever they detect a change in the internetworkconfigurations
