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Configuring Dial Services
8-2
308621-14.00 Rev 00
Bandwidth-on-Demand Terminology
Table 8-1 lists the terminology that Site Manager and this guide use to describe
circuits in a bandwidth-on-demand configuration.
PPP Multilink
Multilink is a feature of PPP that you can enable for individual PPP links. Site
Manager automatically configures PPP multilink when you configure circuits for
bandwidth-on-demand service.
Links are logical communication channels between two routers. A typical link
includes two ISDN B channels, one dial-up modem connection, and a leased 64
Kb/s line. Multilink enables you to:
Group lines of different speeds.
Distribute traffic more evenly among the lines.
Maintain packet sequence.
Monitor traffic volume (for bandwidth-on-demand service).
These features are particularly beneficial for bandwidth-on-demand
configurations, where the router activates additional dial-up lines to relieve
congestion over a single leased line, a leased multilink bundle, or a demand line.
Table 8-1. Terminology for Bandwidth-on-Demand Service
Type of Circuit Referred to As
Leased circuit
Leased multilink circuit
Bandwidth circuit
You designate a leased circuit as a bandwidth circuit to
enable bandwidth-on-demand service.
Dial-on-demand circuit Demand circuit
This is a demand circuit for which you can provide
bandwidth-on-demand service. You do not designate this
as a bandwidth circuit.
Dial-up circuit that helps the
congested leased circuit
Dial-up or secondary circuit
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