6
Configuring link-up event suppression
To configure link-up event suppression on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3. Set a link-up event
suppression interval.
link-delay
delay-time
mode
up
Link-up event suppression is disabled by
default.
NOTE:
The link-delay mode up command and the link-delay command supersedes each other, and
whichever is configured last takes effect.
Configuring loopback testing on an Ethernet
interface
If an Ethernet interface does not work normally, you can enable loopback testing on it to identify the
problem. Loopback testing has the following types:
• Internal loopback testing—Tests all on-chip functions related to Ethernet interfaces.
• External loopback testing—Tests hardware of Ethernet interfaces. To perform external
loopback testing 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 packet, the hardware of the
interface is faulty.
An Ethernet interface in a loopback test does not forward data traffic.
Configuration restrictions and guidelines
• On an interface that is physically down, you can only perform internal loopback testing. On an
interface administratively shut down, you can perform neither internal nor external loopback
testing.
• During loopback testing, the Ethernet interface operates in full duplex mode. When you disable
loopback testing, the interface returns to its duplex setting.
• Loopback testing is a one-time operation, and is not recorded in the configuration file.
Configuration procedure
To enable loopback testing on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
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