HP 5900 series Command Reference Manual: Loopback

Layer 2 - lan switching.
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When the interface comes down, the link-down event is not reported to the CPU unless the interface
is still down when the suppression interval (delay-time) expires.
When the interface goes up, the link-up event is immediately reported.
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
up when the suppression interval (delay-time) expires.
When the interface comes down, the link-down event is immediately reported.
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.
Examples
# Set the link-down event suppression interval to 8 seconds on interface Ten-GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface ten-gigabitethernet 1/0/1
[Sysname-Ten-GigabitEthernet1/0/1] link-delay 8

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 normally, 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 a physically down interface (displayed as in DOWN state), you can only perform an internal
loopback test, and an external loopback test will fail. On an administratively shut down interface
(displayed as in ADM or Administratively DOWN state), you cannot perform an internal or external
loopback test.
The speed, duplex, mdi, and shutdown commands are not available during a loopback test.
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This manual also for:

5920 series

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