
Configuring Dial Services
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117353-B Rev. 00
Bandwidth-on-Demand Service
Bandwidth-on-demand service lets you configure additional dial-up lines for:
• A congested leased line
• A congested multilink bundle, which is a set of links between two peer routers
• A congested dial-on-demand line
When data traffic exceeds the capacity of a line or bundle, bandwidth-on-demand
service reduces congestion by adding up to 29 dial-up lines. The router can then
provide a total of 30 lines for communication.
PPP multilink is the protocol that enables the router to use multiple dial-up lines
simultaneously to transmit data. The actual number of lines in a multilink bundle
depends on hardware platform constraints, total speed of the bundle, the speed of
each link, and the type of traffic you are sending.
You can manage the allocation of bandwidth for a multilink bundle using the PPP
BAP. This protocol is available only for ISDN lines; you configure it after you
configure bandwidth-on-demand service. For more information about BAP, refer
to Chapter 8.
Enabling Bandwidth-on-Demand Service
The leased line, demand line, or leased multilink bundle is the physical connection
over which the leased or demand circuit (the logical connection) carries traffic.
The procedure for enabling bandwidth-on-demand service differs for leased
circuits and demand circuits.
For a leased circuit, you designate the circuit as a bandwidth-on-demand circuit.
This instructs the router to provide secondary dial-up lines if the leased circuit
becomes congested.
Note:
For information about adding bandwidth for demand lines, see
“Bandwidth-on-Demand Service for Congested Demand Lines
” on page 1-12.
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