Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 42)

100

101

Configuring Dial Services

1-14

117353-B Rev. 00

Dial Backup Service

Dial backup service lets you configure backup lines for failed primary lines. 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 configure 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 you can configure.

Table 1-3

lists the protocols for each type of primary and backup circuit.

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 cannot

be dial backup primaries.

Frame relay PVCs

Backup Any WAN line including ISDN B channels. Lines must be in the dial

backup pool.

Table 1-3. Primary and Backup Circuit Protocols

If the primary circuit’s protocol is The backup circuit’s protocol can be

Standard Async or Sync PPP only

PPP Async or Sync PPP only

Frame relay -- backing up a service record

with only one PVC

Async or Sync PPP only

Frame relay -- backing up the entire frame

relay interface

Frame relay only

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