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This chapter describes hot to configure dialer interfaces, which can be configured as the logical intermediary between one or more physical interfaces and another physical interface that is to function as backup.
For a complete description of the dial backup commands in this chapter, refer to the "Dialer Profiles Backup Commands" chapter of the Dial Solutions Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.
To configure a dialer interface and a specific physical interface to function as backup to other physical interfaces, perform the tasks in the following sections:
See the "Dialer Profile for ISDN BRI Backing Up Two Leased Lines Example" for a comprehensive backup example using Dialer Profiles. In this example, one BRI functions as backup to two serial lines and can make calls to two different destinations.
To configure the dialer interface that will be used as an intermediary between a physical interface that will function as backup interface and the interfaces that will use the backup, use the following commands beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| interface dialer number | Create a dialer interface. | ||
| Specify IP unnumbered loopback. | |||
| Specify PPP encapsulation. | |||
| dialer remote-name username | Specify the remote router's CHAP authentication name. | ||
| dialer string dial-string | Specify the remote destination to call. | ||
| dialer pool number | Specify the dialing pool to use for calls to this destination. | ||
| dialer-group group-number | Assign the dialer interface to a dialer group. |
To configure the physical interface that is to function as backup, use the following commands beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| interface type number | Specify the interface. | ||
| Specify PPP encapsulation. | |||
| dialer pool-member number | Make the interface a member of the dialing pool that the dialer interface will use; make sure the number arguments have the same value. | ||
| ppp authentication chap | Specify CHAP authentication. |
To configure one or more interfaces to use a backup interface, use the following commands beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| interface type number | Specify the interface to be backed up. | ||
| Specify IP unnumbered loopback. | |||
| backup interface dialer number | Specify the backup interface. | ||
| backup delay enable-delay disable-delay | Specify delay between the physical interface going down and the backup being enabled, and between the physical interface coming back up and the backup being disabled. |
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 physical interface BRI 0 as a member. Thus, physical interface 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 5551212 dialer-group 1 interface dialer1 ip unnumbered loopback0 encapsulation ppp dialer remote-name Remote1 dialer pool 1 dialer string 5551234 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 dialer1 backup delay 5 10
Posted: Mon May 3 11:45:35 PDT 1999
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