Performing A Loopback Test On An Ethernet Interface - HP FlexFabric 12900 Series Configuration Manual

Layer 2-lan switching
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Step
4.
Set the link-up event
suppression interval.
5.
Set the link-updown
event suppression
interval.
The link-delay command and the link-delay mode command overwrite each other, and whichever is
configured last takes effect.
Do not configure physical state change suppression on a port with MSTP enabled.

Performing a loopback test on an Ethernet interface

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.
Loopback tests include the following types:
Internal loopback test—Tests all on-chip functions related to Ethernet interfaces.
External loopback test—Tests the hardware of Ethernet interfaces. To perform an external loopback
test on an Ethernet interface, connect a loopback plug to the Ethernet interface. The switch sends
test packets out of the interface, which are expected to loop over the plug and back to the interface.
If the interface fails to receive any test packets, the hardware of the interface is faulty.
Configuration restrictions and guidelines
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, and shutdown commands are not available during a loopback test.
During a loopback test, the Ethernet interface operates in full duplex mode. When a loopback test
is complete, the port returns to its duplex setting.
Configuration procedure
To perform a loopback test on an Ethernet interface:
Step
1.
Enter system view.
2.
Enter Ethernet interface view.
Command
link-delay [ msec ]
delay-time mode up
link-delay [ msec ]
delay-time mode updown
Command
system-view
interface interface-type
interface-number
6
Remarks
By default, each time the physical link of a port
comes up, the interface immediately reports the
change to the CPU.
When this command is configured:
The link-up event is not reported to the CPU until
the interface is still up when the suppression
interval (delay-time) expires.
The link-down event is immediately reported.
By default, each time the physical link of a port
comes up or goes down, the interface immediately
reports the change to the CPU.
When this command is configured, the link-up or
link-down event is not reported to the CPU until the
interface is still up or down when the suppression
interval (delay-time) expires.
Remarks
N/A
N/A

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