To configure a dialer interface as a secondary or dial backup, use the backup interface dialer command in interface configuration mode. To disable this feature, use the no form of this command.

backup interface dialer number

no backup interface dialer number

Syntax Description

number Dialer interface number to use as the backup interface.

Command Default

Disabled

Command Modes

Interface configuration

Command History

Release Modification
11.2 This command was introduced.

Usage Guidelines

Multiple dialer interfaces can use the same dialer pool, which might have a single ISDN interface as a member. Thus, that ISDN interface can back up different serial interfaces and can make calls to different sites.

Examples

The following example shows the configuration of a site that backs up two leased lines using one BRI. Two dialer interfaces are defined. Each serial (leased line) interface is configured to use one of the dialer interfaces as a backup. Both of the dialer interfaces use dialer pool 1, which has BRI 0 as a member. Thus, BRI 0 can back up two different serial interfaces and can make calls to two different sites.

interface dialer0
 ip unnumbered loopback0
 encapsulation ppp
 dialer remote-name Remote0
 dialer pool 1
 dialer string 5550112
 dialer-group 1
interface dialer1
 ip unnumbered loopback0
 encapsulation ppp
 dialer remote-name Remote1
 dialer pool 1
 dialer string 5550134
 dialer-group 1
interface bri 0
 encapsulation PPP
 dialer pool-member 1
 ppp authentication chap
interface serial 0
 ip unnumbered loopback0
 backup interface dialer 0
 backup delay 5 10
interface serial 1
 ip unnumbered loopback0
 backup interface dialer 1
 backup delay 5 10

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