Specify the Logical Interface Number

Each logical interface must have a logical unit number. The logical unit number corresponds to the logical unit part of the interface name. For more information, see Configure Aggregated Interfaces.

PPP, Cisco HDLC, and Ethernet CCC encapsulations support only a single logical interface, whose logical unit number must be 0. Frame Relay and ATM encapsulations support multiple logical interfaces, so you can configure one or more logical unit numbers.

You specify the logical unit number in the unit statement at the [edit interfaces interface-name] hierarchy level:

[edit interfaces]

interface-name {

    unit 0 { 

        ...

    }

}

interface-name {

    unit logical-unit-number {

        ...

    }

}

The logical unit number can range from 0 through 16384.