Loopback - H3C S12500 Series Manual

When the interface goes up, the link-up event is immediately reported.
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With the link-delay delay-time mode up command configured:
When the interface goes up, the link-up event is not reported to the CPU unless the interface is still
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up when the suppression interval (delay-time) expires.
When the interface comes down, the link-down event is immediately reported.
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With the link-delay delay-time mode updown command configured, when the interface comes down or
goes up, the link-down or link-up event is not reported to the CPU unless the interface is still down or up
when the suppression interval (delay-time) expires.
On a port, if you configure the link-delay command multiple times, the most recent configuration takes
effect.
Do not configure this command on a port with MSTP enabled.
The link-delay delay-time command and the link-delay delay-time mode up command are not
supported.
Examples
# Set the physical state change suppression interval to 8 seconds on interface GigabitEthernet 3/0/1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1
[Sysname-GigabitEthernet3/0/1] link-delay 8

loopback

Use loopback to perform a loopback test on an Ethernet interface.
Use undo loopback to cancel a loopback test on an Ethernet interface.
Syntax
loopback { external | internal }
undo loopback
Default
Loopback test is disabled on an interface.
Views
Ethernet interface view
Predefined user roles
network-admin
mdc-admin
Parameters
external: Performs an external loopback test on the Ethernet interface. The keyword is not supported in
the current software version. The keyword is reserved for future support.
internal: Performs an internal loopback test on the Ethernet interface.
Usage guidelines
If an Ethernet interface does not work normally, you can perform a loopback test on it to identify the
problem.
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