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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: 1000kbps
Maximum Transmit Unit: 1536
Internet protocol processing: disabled
Physical: Loopback
Last clearing of counters:
Last 300 seconds input:
Last 300 seconds output:
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.)
<Sysname> display interface loopback 0
LoopBack0
Current state: UP
Line protocol state: UP(spoofing)
Description: LoopBack0 Interface
Maximum Transmit Unit: 1536
Internet protocol processing : disabled
Physical: Loopback
Last clearing of counters:
Table 9 Command output
Field
Current state
Line protocol state
Description
Bandwidth
Maximum Transmit Unit
Internet protocol processing: disabled
Never
0 bytes/sec, 0 bits/sec, 0 packets/sec
0 bytes/sec, 0 bits/sec, 0 packets/sec
Never
Description
Physical layer state of the interface:
•
UP—The loopback interface can receive and transmit packets.
•
Administratively DOWN—The interface was manually shut down
by using the shutdown command.
Data link layer protocol state of the interface. UP (spoofing) means that
the data link layer protocol state of the interface is up, but the link is an
on-demand link or is not present.
Description string of the interface.
Expected bandwidth of the interface. This field is not displayed when
the value is 0.
MTU of the interface.
Indicates that the interface cannot process Layer 3 packets (displayed
when the interface is not configured with an IP address).
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