Avaya Configuring Dial Services Bedienungsanleitung Seite 44

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Configuring Dial Services
1-14
308621-14.00 Rev 00
Dial Backup Service
Dial backup service provides alternate paths between the same two routers for
data to reach its destination if the primary line fails.
A primary line is a leased line, a leased multiline (Standard and PPP only), or a
leased multilink connection. This leased line acts as the physical connection over
which the leased circuit (the logical connection) carries traffic. You designate
these leased circuits as primary circuits, which instructs the router to provide
backup service if the primary line and circuit fail.
If a primary circuit fails and you configured dial backup service for that circuit,
the router activates an available backup line. When the primary circuit is restored,
the router reroutes all traffic from the backup circuit to the primary circuit and
clears the dial backup connection.
Dial backup is supported on asynchronous lines (RS-449), synchronous lines
(RS-449, V.35, RS-422, and X.21), and ISDN interfaces.
Table 1-2
lists the primary and backup lines that you can configure.
Table 1-2. Primary and Backup Lines
Line Type
Primary Any leased line up to T1/E1 rates, including multiline (Standard and
PPP only) and multilink connections. Frame relay multiline circuits and
L2TP circuits cannot be dial backup primaries.
Frame relay PVCs
Backup Any WAN line including ISDN B channels. Lines must be in the dial
backup pool.
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