Configuring the Loopback Interface

On the router, you can configure one physical loopback interface, lo0 , and one or more addresses on the interface. To do this, include the following statements:

 [edit interfaces]  lo0 {   unit 0 {     family inet {  loopback-address  ;       <  loopback-address2  >;       ...     }   } } 

When specifying the loopback address, do not include a destination prefix. Also, do not specify a loopback address on any unit number other than unit 0.