
Dial Services Overview
1-7
To activate additional lines, the router searches the bandwidth-on-demand pool for
an available line. Because lines in a bandwidth pool can reside across slots, you
designate each slot as either preferred, reserved, or local. This designation
determines the order of slots that the router searches for available lines; the
preferred slot is first, the reserved slot is next, and the local slot is last. The local
slot is the slot containing the configured demand pool. When the router activates
additional lines, they adopt the configuration of the congested demand circuit.
PPP multilink is the protocol that enables the router to use multiple lines
simultaneously to transmit data. It provides the functionality for lines at different
speeds to evenly distribute data across multiple lines. For more information about
PPP multilink, refer to “Implementation Notes Specific to Dial-on-Demand” in
Chapter 3.
Figure 1-4 illustrates the addition of two switched lines to provide more
bandwidth for a congested demand line.
Figure 1-4. Additional Lines for a Dial-on-Demand Connection
ISDN
Key:
New York City
Boston
Initial Demand
Circuit
Additional Demand
Circuit
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