Avaya Configuring PPP Services Bedienungsanleitung Seite 39

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PPP Concepts
308639-14.00 Rev 00
2-11
PPP is automatically configured on lines that you select for dial services. PPP,
with either CHAP or PAP, implements a router identification mechanism that dial
services require.
Nortel Networks provides three types of dial services: dial-on-demand,
bandwidth-on-demand, and dial backup. For information on how to configure
dial-on-demand, bandwidth-on-demand, and dial backup lines, see Configuring
Dial Services.
Dial-on-Demand
Dial-on-demand enables you to establish a circuit “on demand” as opposed to
having a leased-line connection, which is always available. By using a circuit on a
demand basis, you can have a network connection only when you need it and
significantly reduce your line costs.
Bandwidth-on-Demand
Bandwidth-on-demand uses secondary, dial-up lines to augment a primary, leased
line (or lines) or an initial dial-on-demand line when the primary line experiences
congestion. Congestion occurs when traffic volume exceeds the configured
congestion threshold. Bandwidth-on-demand brings up these secondary lines one
at a time, as needed, up to a maximum of 30 lines, including the primary lines. Up
to 30 lines can be combined into a multilink bundle, depending upon platform
constraints, total bundle speed, variance in member links speeds, and traffic
characteristics. When congestion abates, the secondary lines become inactive.
Please consult the Nortel Networks Technical Solutions Center in your area for
design guidelines.
Dial Backup
If a primary PPP, frame relay, or standard line fails and you have enabled dial
backup, the router automatically establishes a backup line and data transmission
continues.
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