Configuring Physical State Change Suppression On An Ethernet Interface; Performing A Loopback Test On An Ethernet Interface - HP 6125XLG Configuration Manual

Configuring physical state change suppression on an Ethernet
interface
IMPORTANT:
Do not configure physical state change suppression on an Ethernet interface with MSTP, or Smart Link
enabled.
The physical link state of an Ethernet interface is either up or down. Each time the physical link of a port
goes up or comes down, the interface immediately reports the change to the CPU. The CPU then notifies
the upper-layer protocol modules (such as routing and forwarding modules) of the change for guiding
packet forwarding, and automatically generates traps and logs, informing the user to take
corresponding actions.
To prevent frequent physical link flapping from affecting system performance, configure physical state
change suppression to suppress the reporting of physical link state changes. The system reports physical
layer changes only when the suppression interval expires.
When the link-delay delay-time command is configured:
The link-down event is not reported to the CPU unless the interface is still down when the suppression
•
interval (delay-time) expires.
The link-up event is immediately reported.
•
When the link-delay delay-time mode up command is configured:
The link-up event is not reported to the CPU unless the interface is still up when the suppression
•
interval (delay-time) expires.
• The link-down event is immediately reported.
When the link-delay delay-time mode updown command is configured, 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.
To configure physical state change suppression on an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet
interface view.
3. Configure physical
state change
suppression on the
interface.

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:
Command
system-view
interface interface-type
interface-number
link-delay [ msec ]
delay-time [ mode { up |
updown }]
6
Remarks
N/A
N/A
By default, the link-down or link-up event is
immediately reported to the CPU.
If you configure this command multiple times on an
Ethernet interface, the most recent configuration
takes effect.