
Configuring Dial Services
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In Figure 1-3, three circuits share two physical lines that make up Demand Pool 1.
Note that only two of the circuits using Demand Pool 1 can be active
simultaneously because only two modems are available. The IP addresses are
associated with each circuit, not with the physical line.
In addition to assigning a demand pool ID to each circuit, you can also assign
phone lists (for use with V.25bis and ISDN dialing) and protocol interfaces. You
can read about these options later in this manual.
Activating Demand Circuits
The router activates a demand circuit under one of three conditions:
• The router has data to send across the circuit.
When the router has data to transmit, it automatically selects one of the
demand lines from the circuit’s associated demand pool. As long as data is
going across the line, the end-to-end connection remains active.
• You enable the Force Dial parameter.
To activate a line immediately, you configure the Force Dial parameter. Using
this parameter, you force the router to initiate a connection regardless of
whether there is data activity. To configure this parameter, refer to Chapter 8.
• You specify a time of day to activate the circuit.
Using the Schedule option, you can schedule the circuit’s availability for a
specific day and time. The schedule parameters are part of the circuit’s
configuration (refer to Chapter 8). The Schedule option also allows you to
configure whether the router uses the Inactivity Time parameter to
dynamically deactivate the connection.
Adding Bandwidth for Demand Lines
To provide more bandwidth for a congested demand line, you can use up to 29
additional lines from an existing bandwidth-on-demand pool, providing a total of
30 lines for communication. Adding bandwidth to aid a demand line benefits
time-critical applications that rely on data reaching its destination efficiently.
The router determines that the demand line is congested when the traffic over the
line exceeds a certain user-configured threshold. The router--configured as the
congestion monitor--then searches for an available line from the
bandwidth-on-demand pool that you associate with this demand circuit.
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