Specifying the Logical Interface Number

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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 Interface Naming.

Point-to-Point Protocol (PPP), Cisco High-level Data Link Control (HDLC), and Ethernet circuit cross-connect (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 by including the unit statement:




unit logical-unit-number {
...
}

You can include this statement at the following hierarchy levels:

[edit interfaces interface-name]
[edit logical-systems logical-system-name interfaces interface-name]

The logical unit number can be from 0 through 16,384.

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