
Dial-on-Demand Implementation Notes
117353-B Rev. 00
6-15
Static Routes
You need to configure the demand circuit protocols so they do not send broadcast
messages to the network. Once you disable broadcast messages, the router must
determine the destination address using a static route.
A static route specifies the transmission path that data must follow to another
network. This path is based on the destination address of the data. Protocols that
can use static routes include:
• AURP
•DECnet
• DLSw
•IP
•IPX
• XNS
Demand circuits require static routes if you disable the circuit’s routing update
protocols. To configure a static route, you need to specify in the protocol’s routing
table the address of the network to which you will be sending data. The address
must be unique to that circuit. For more information about static routes for each of
these protocols, see the appropriate protocol manual.
Dial Optimized Routing
Dial optimized routing lets you exchange IP RIP and IPX RIP/SAP routing
updates only when a connection is active. By limiting when the router sends
updates, dial optimized routing reduces the number of connections as well as line
costs.
For each dial-on-demand circuit, you have the choice of enabling dial optimized
routing. If you enable dial optimized routing, the router establishes a demand
connection only for outbound data packets, or if it receives a request from the
protocol. The presence of IP RIP and IPX RIP/SAP packets alone will not trigger
a dial connection. If you disable dial optimized routing, any packet can initiate
demand connections.
To configure dial optimized routing, see “Customizing PPP and Frame Relay
Demand Circuits” on page 10-6.
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