
Dial Services Overview
117353-B Rev. 00
1-7
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, the circuit searches for
an available demand line from its associated demand pool. When it finds an
available line, the router establishes a dial-up connection to the remote router. The
router terminates the connection when there is no more data to send or receive,
when you manually take down the connection, or the scheduled time for an active
connection expires.
Figure 1-3
shows the relationship between demand lines, pools, and circuits using
PPP as the data link layer protocol.
Figure 1-3. Example of Demand Lines, Pools, and Circuits
Circuit 1 – 192.32.14.1
(the local interface to Los Angeles)
Circuit 2 – 192.32.15.1
(the local interface to Chicago)
Circuit 3 – 192.32.16.1
(the local interface to Dallas)
Dial
device
Chicago
Circuit 2 – 192.32.15.2
Dial
device
Dial
device
New York
Demand pool:
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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