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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.
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 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, perform the following tasks beginning in global configuration mode:
| Task | Command |
|---|---|
| Step 1 Create a dialer interface. | interface dialer number |
| Step 2 Specify IP unnumbered loopback. | ip unnumbered loopback0 |
| Step 3 Specify PPP encapsulation. | encapsulation ppp |
| Step 4 Specify the remote router's CHAP authentication name. | dialer remote-name name |
| Step 5 Specify the remote destination to call. | dialer string string |
| Step 6 Specify the dialing pool to use for calls to this destination. | dialer pool number |
| Step 7 Assign the dialer interface to a dialer group. | dialer-group number |
To configure the physical interface that is to function as backup, perform the following tasks beginning in global configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the interface. | interface type number |
| Step 2 Specify PPP encapsulation. | encapsulation ppp |
| Step 3 Make the interface a member of the dialing pool that the dialer interface will use; make sure the number arguments have the same value. | dialer pool-member number |
| Step 4 Specify CHAP authentication. | ppp authentication chap |
To configure one or more interfaces to use a backup interface, perform the following tasks beginning in global configuration mode:
| Task | Command |
|---|---|
| Step 1 Specify the interface to be backed up. | interface type number |
| Step 2 Specify IP unnumbered loopback. | ip unnumbered loopback0 |
| Step 3 Specify the backup interface. | backup interface dialer number |
| Step 4 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. | backup delay enable-delay disable-delay |
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
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