
Dial Services Overview
114062 Rev. A 1-5
How Demand Lines, Pools, and Circuits Work Together
When you create demand circuits, you assign a demand pool ID to each circuit.
Note that many demand circuits can use the same demand pool and, therefore, can
use the same lines in that pool. The line itself does not have a specific network
address; it is the circuit that has the associated network address.
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 it 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 lines, pools and circuits.
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
DS0014A
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