HP FlexNetwork NJ5000, User Manual

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65
Configuring a loopback test
You can check whether an Ethernet port operates correctly by performing Ethernet port loopback test.
During the test time, the port cannot forward data packets correctly.
Ethernet port loopback test has the following types:
•
Internal loopback test
—Establishes self loop in the switching chip and checks whether there
is a chip failure related to the functions of the port.
•
External loopback test
—Uses a loopback plug on the port. Packets forwarded by the port will
be received by itself through the loopback plug. The external loopback test can be used to
check whether there is a hardware failure on the port.
Configuration guidelines
When you configure a loopback test, follow these restrictions and guidelines:
•
When a port is physically down, you cannot perform an external loopback test on the port.
•
After a port is shut down manually, you can perform neither internal nor external test on the port.
•
When a port is under loopback test, you cannot apply
Rate
,
Duplex
,
Cable Type
, and
Port
Status
configuration to the port.
•
An Ethernet port operates in full duplex mode when a loopback test is performed. It restores its
original duplex mode after the loopback test is finished.
Configuration procedure
1.
From the navigation tree, select
Device
>
Loopback
.
Figure 58 Loopback test page
2.
Select
External
or
Internal
for loopback test type.
3.
Select an Ethernet interface from the chassis front panel.
4.
Click
Test
.
After the test is complete, the system displays the loopback test result.