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Configuring Dial Services

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308621-14.00 Rev 00

Backup Lines and Pools

A backup line is an alternative line that carries 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 that the primary circuits can use. Each

backup pool is identified by a backup pool ID.

The lines in a backup pool can reside in any slot on a router that supports WAN

lines; therefore, the pool can span multiple slots. Lines in a backup pool can

connect to a modem, directly to a PSTN (using the ARN with the V.34 Modem

Adapter Module), or directly to an ISDN network (using a router with internal

ISDN capability).

You can combine asynchronous, synchronous, and ISDN interfaces in a single

pool. The synchronous interfaces can use Raise DTR or V.25bis signaling for

modem connections. The asynchronous interfaces can use Raise DTR, V.25bis, or

Hayes signaling for modem connections. Hayes signaling requires that you use AT

modem commands to send dialing instructions to the modem. The ISDN lines use

ISDN signaling for network connections.

How Backup Lines, Pools, and Circuits Work Together

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

primary circuit and assign it a backup pool ID. If the primary circuit fails, the

router activates the backup line to carry the backup circuit. If your network uses a

multiline or multilink primary, the backup line is activated when the last line in the

multiline or multilink bundle fails. You must first configure a leased circuit and a

backup pool before you can configure backup circuits.

Figure 1-9

shows how backup lines, pools, and circuits work together. The router

in San Diego has two leased lines, one going to a router in Phoenix and the other

to a router in San Francisco. The circuits for each of these destinations are

associated with backup pool 1. If either of these leased lines fails, the San Diego

router activates backup line 1 from backup pool 1 to continue routing traffic to the

destination.

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