
Configuring Dial Services
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IPX RIP and SAP Broadcast Timers
To prevent broadcast messages from keeping the demand circuit up, you can
configure Routing Information Protocol (RIP) and Service Advertising Protocol
(SAP) broadcast timers for IPX transmission.
RIP and SAP broadcast timers enable you to control the frequency of update
packet transmissions. These broadcast timers allow you to configure how often
update transmissions occur. You can even eliminate RIP and SAP broadcasts
entirely. By controlling broadcast traffic, you can prevent the demand circuit from
remaining active unnecessarily.
For information about broadcast timers, refer to Configuring IPX Services.
Traffic Filters
To prevent routing updates and protocol-specific messages from keeping the
circuit up, you can configure traffic filters that specify which packets are permitted
across an established dial-up line and which packets are prevented from bringing
up a dial-up line.
Traffic filters enable the router to selectively relay or drop a packet, frame, or
datagram, based on standard protocol fields or user-defined fields.
If you implement inbound filters, the router drops unwanted packets at the
interface where the router receives data. By filtering incoming data, you can
prevent the unwanted packets from passing on to the destination interface.
If you implement outbound filters, the router drops unwanted packets before
dialing a line. The router continues to filter the data so the unwanted packets do
not keep the circuit up.
You can also filter outbound packets to prevent the inactivity timer from resetting.
For example, RIP packets can always be sent out, but if no other data is sent, the
inactivity time expires and the line goes down.
To configure traffic filters, see Configuring Traffic Filters and Protocol
Prioritization.
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