Avaya Configuring Dial Services Uživatelský manuál stáhnout pdf (Strana 47)

100

101

Dial Services Overview

117353-B Rev. 00

1-19

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.

Figure 1-9. Example of Backup Pools, Lines, and 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 a pool and assign that pool exclusively to that circuit.

DS0029A

128.32.17.0

128.32.18.0

Circuit 1 - 128.32.17.1

(the local interface to Phoenix)

Circuit 2 - 128.32.18.1

(the local interface to San Francisco)

Configuration of the San Diego router:

San Diego

Phoenix

San Francisco

128.32.17.2

128.32.18.2

Backup pool 1:

Backup line 1

ISDN

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 481 482

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