
PPP Concepts
115391-A Rev. A 10-9
PPP Dial Services Support
Bay Networks dial services offer access to switched networks through dial-up line
connections (also called switched lines) that are active only when you choose to
use them. In contrast, a leased line is always available. If you transmit limited
amounts of data, or if your data transmission is intermittent, dial services may let
you run your network more effectively and economically.
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.
Bay 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.
Please consult the Bay Networks Technical Response Center in your area for
design guidelines (see “How to Get Help” on page xxxi).
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