
Dial Services Overview
1-5
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.
How Demand Pools and Demand Circuits Work Together
When the router has data to send across a demand circuit, that circuit searches for
an available demand line from its associated demand pool.
When the circuit finds an available line, the router then establishes a dial-up
connection to the remote router. The router terminates the connection when the
router stops sending or receiving data, when you manually take down the
connection, or when the configured time interval for an active connection expires.
Figure 1-3 shows the relationship between demand circuits and demand pools.
Figure 1-3. Example of Demand Pools and Circuits
Circuit 1 – 192.32.14.1
(the local interface to get to Los Angeles)
Circuit 2 – 192.32.15.1
(the local interface to get to Chicago)
Circuit 3 – 192.32.16.1
(the local interface to get to Dallas)
Dial
Device
Chicago
Circuit 2 – 192.32.15.2
Dial
Device
Dial
Device
New York
Demand Pool 1:
Dial
Device
Dial
Device
Dallas
Los Angeles
192.32.14.0
Circuit 1 – 192.32.14.2
Circuit 3 – 192.32.16.2
192.32.16.0
192.32.15.0
Line 1
Line 2
Configuration of the New York Router
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