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Configuring Interfaces

Configure the interfaces on your router. This example shows configurations for Asynchronous Transfer Mode (ATM), SONET, loopback, and out-of-band management interfaces. For more information about configuring interfaces, see the JUNOS Network Interfaces Configuration Guide.

Configure an ATM interface:



[edit]
interfaces {


at-4/0/0 {
description core-router; 


atm-options {
vpi 0 maximum-vcs 1024;
ilmi;
}




unit 131 {
description to-other-core-router;
encapsulation atm-snap;
point-to-point;
vci 0.131;


family inet {
address 12.1.1.1/30;
}


family iso;
}


}


}

The fxp0 interface can be used for out-of-band management. However, because most service providers use inband communication for management (because of lower operating costs), you can disable this interface to make the router more secure.



[edit]
interfaces {


fxp0 {
disable;
}


}

Configure the loopback interface. To protect the Routing Engine, apply a firewall filter to the router’s loopback interface. This filter, which you define at the [edit firewall] hierarchy level, checks all traffic destined for the Routing Engine that enters the router from the customer interfaces. Adding or modifying filters for every interface on the router is not necessary.



[edit]
interfaces {


lo0 {


unit 0 {


family inet {


filter {
input protect-routing-engine;
}


address 10.10.5.1/32;
}




family iso {
address 48.0005.80dd.f900.0000.0001.0001.0000.0000.011.00;
}


}


}


}

Configure a SONET interface:



[edit]
interfaces {


so-2/0/0 {
description To-other-router;
clocking external;


sonet-options {
fcs 32;
payload-scrambler;
}




unit 0 {


family inet {
address 10.1.5.1/30;
}


family iso;
}


}


}

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