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Configuring an ISDN Dialer Interface as a Backup Interface

Configuring the ISDN interface as a backup interface ensures continuous network connectivity. The Services Router can be configured to fail over to the ISDN interface if the primary connection experiences interruptions in Internet connectivity.

To configure an ISDN interface as the backup interface, include the backup-options statement at the [edit interfaces interface-name unit logical-unit-number] hierarchy level:



[edit interfaces interface-name unit logical-unit-number]
backup-options {
interface dln.0;
}

interface-name is the primary interface. The backup interface is specified as dln.

Example: Configuring an ISDN Interface as the Backup Interface

The following example illustrates a backup configuration using a primary serial interface, two dialer interfaces, and a physical ISDN interface.

See Figure 51 for the topology used for this example.

Figure 51: ISDN Backup Topology

Image g017025.gif

Configure dialer interface dl0 as the backup interface on the primary serial interface t1-4/0/1:

Configuration on the Primary Serial Interface



[edit interfaces]
t1-4/0/1 {
encapsulation ppp;


backup-options {
interface dl0.0;
}




unit 0 {


family inet {
address 192.168.10.2;
}


}


}

Configuration on the Dialer Interface



[edit interfaces]
dl0 {
encapsulation ppp;


unit 0 {


dialer-options {
pool 10;
dial-string 5552222;
activation-delay 10;
deactivation-delay 10;
}




family inet {


address 172.20.10.2 {
destination 172.20.10.1;
}


}


}


}

Configuration on the Physical ISDN Interface



[edit interfaces]
br-1/0/0 {


isdn-options {
calling-number 5558888;
spid1 51255511110101 5551111;
spid2 51255511120101 5551112;
switch-type ni1;
t310 70;
}




dialer-options {
pool 10 priority 3;
pool 2 priority 25;
}


}

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