Avaya Configuring Dial Services Manual de usuario descargar pdf (Pagina 36)

Configuring Dial Services

1-10

Figure 1-6. Dial Backup Support in an ISDN Network

Backup Lines and Pools

Backup lines provide an alternative line to carry data if the primary line fails. It is

advantageous, therefore, to have one or more backup lines to ensure data

transmission. To assign one or more backup lines to a primary line, you establish a

backup pool.

A backup pool is a collection of lines the primary circuits can use. You can

connect these lines to a modem or directly to an ISDN network (using a router

with integral ISDN capability). A backup line can reside in any slot in the router

that supports WAN lines. In addition, a backup pool can span multiple slots. Each

backup pool is identiﬁed by a backup pool ID.

How Backup Pools and Primary Circuits Work Together

For each circuit that needs a backup, you designate that circuit as a primary circuit

and assign it a backup pool ID. If the primary line fails, the router activates the

backup line to carry the backup circuit. The backup circuit inherits the

conﬁguration and protocol characteristics of the primary circuit. Note that you

must ﬁrst conﬁgure a leased circuit and a backup pool before you conﬁgure a

primary circuits.

You can assign the same backup pool ID to more than one primary circuit. If you

want only one backup line dedicated to a primary circuit, then you should

conﬁgure only one line in the pool and assign that pool exclusively to that circuit.

Dial Backup Line

Primary Leased Line

Router Router

ISDN

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Avaya Configuring Dial Services Manual de usuario Pagina 36