Cabletron Systems SmartSwitch Router, Руководство пользователя

Страница: 246 / 338

Chapter 16: IPX Routing Configuration Guide
246 SmartSwitch Router User Reference Manual
this information is immediately broadcast to any neighboring routers. Routers also send
periodic RIP broadcast packets containing all routing information known to the router.
The SSR uses IPX RIP to create and maintain a database of internetwork routing
information. The SSR's implementation of RIP allows the following exchanges of
information:
• Workstations locate the fastest route to a network number by broadcasting a route
request.
• Routers request routing information from other routers to update their own internal
tables 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 of
the internetwork configuration.
• Routers perform broadcasting whenever they detect a change in the internetwork
configurations.
SSR's RIP implementation follows the guidelines given in Novell's IPX RIP and SAP
Router Specification Version 1.30 document.
SAP (Service Advertising Protocol)
SAP provides routers with a means of exchanging internetwork service information.
Through SAP, servers advertise their services and addresses. Routers gather this
information and share it with other routers. This allows routers to create and dynamically
maintain a database of internetwork service information. SAP allows a router to exchange
information with a neighboring SAP agent. As a router becomes aware of any change in
the internetwork server layout, this information is immediately broadcast to any
neighboring SAP agents. SAP broadcast packets containing all server information known
to the router are also sent periodically.
The SSR uses IPX SAP to create and maintain a database of internetwork service
information. The SSR’s implementation of SAP allows the following exchanges of
information:
• Workstations locate the name and address of the nearest server of certain type
• Routers request the names and addresses of either all or certain type of servers
• Servers respond to the workstation’s or router’s request
• Routers make periodic broadcasts to make sure all other routers are aware of the
internetwork configuration
• Routers perform broadcasting whenever they detect a change in the internetwork
configurations