
Implementation Notes
3-15
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 update packets and protocol-specific messages from keeping
the circuit up, you can configure traffic filters that determine which packets are
transmitted over an established dial 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.
To configure traffic filters, see Configuring Traffic Filters and Protocol
Prioritization.
Protocol Prioritization
When you configure your router, you can prioritize the traffic sent across a
synchronous line interface using protocol prioritization. Being able to prioritize
traffic is important for your time-sensitive applications.
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