4000 Router Series Interface Command Reference

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Parameters

interface-number: Specifies a loopback interface by its number, which can be the number of any existing

loopback interface. If you do not specify this argument, the command displays information about all

existing loopback interfaces on the device.

brief: Displays brief interface information. If you do not specify this keyword, the command displays

detailed interface information.

down: Displays information about interfaces in down state and the causes. Without this keyword, the

command displays information about interfaces in all states.

description: Displays complete interface descriptions. If you do not specify this keyword, the command

displays only the first 27 characters of interface descriptions.

Usage guidelines

This command is supported only after a loopback interface is created.

If the loopback keyword is not specified, the command displays information about all interfaces of the

device.

If the loopback keyword is specified but the interface-number argument is not specified, the command

displays information about all existing loopback interfaces.

Examples

# Display detailed information about interface loopback 0. (Suppose the loopback interface supports

traffic statistics collection.)

<Sysname> display interface loopback 0

LoopBack0

Current state: UP

Line protocol state: UP (spoofing)

Description: LoopBack0 Interface

Bandwidth: 0kbps

Maximum Transmit Unit: 1536

Internet protocol processing: disabled

Physical: Loopback

Last clearing of counters: Never

Last 300 seconds input: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

# Display detailed information about interface loopback 0. (Suppose the loopback interface does not

support traffic statistics collection.)