
Configuring Dial Services
1-4
Figure 1-2. Dial-on-Demand Service
Demand Lines and Pools
Demand lines provide the physical connections over which the demand circuits
transmit and receive data. To maximize the number of circuits that can be active
simultaneously, you establish a
demand
pool.
A demand pool is a group of one or more lines that reside in the same slot on the
router. You can connect these lines to a modem, a DSU/CSU, or directly to an
ISDN network (using a router with integral ISDN capability). Within a demand
pool, each line is either a synchronous line, which you can configure for Raise
DTR or V.25bis signaling, or an ISDN line. You identify each demand pool by
assigning a
demand pool ID
.
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.
Dial
Device
Dial
Device
Dial
Device
Dial
Device
Dial
Device
Los Angeles
Chicago
Dallas
New York
Demand
Pool 1:
Slot 2
Back of
Router
Data arrives at the New York router, but the final destination
is Dallas. A port in the demand pool transmits the data.
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