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Examples
# Set the link-down event suppression interval to 8 seconds on interface GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] link-delay 8
# Set the link-up event suppression interval to 800 milliseconds on interface GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] link-delay msec 800 mode up
loopback
Use loopback to perform a loopback test on an Ethernet interface.
Syntax
loopback { external | internal }
Views
Ethernet interface view
Predefined user roles
network-admin
Parameters
external: Performs an external loopback test on the Ethernet interface.
internal: Performs an internal loopback test on the Ethernet interface.
Usage guidelines
If an Ethernet interface does not work correctly, you can perform a loopback test on it to identify the
problem.
An Ethernet interface in a loopback test does not forward data traffic.
On an administratively shut down Ethernet interface (displayed as in ADM or Administratively
DOWN state), you cannot perform an internal or external loopback test.
The speed, duplex, mdix-mode, and shutdown commands are not available during a loopback
test.
During a loopback test, the Ethernet interface operates in full duplex mode. When the loopback test
is complete, the port returns to its duplex setting.
Examples
# Perform an internal loopback test on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] loopback internal
Loop internal succeeded!
port auto-power-down
IMPORTANT:
Fiber ports do not support this command.
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