Enabling Loopback Test; Enabling The System To Test Connected Cable - H3C S5100-SI Operation Manual

Enabling Loopback Test

You can configure the Ethernet port to run loopback test to check if it operates normally. The port
running loopback test cannot forward data packets normally. The loopback test terminates
automatically after a specific period.
Follow these steps to enable loopback test:
To do...
Enter system view
Enter Ethernet port view
Enable loopback test
external: Performs external loop test. In the external loop test, self-loop headers must be used on
the port of the switch ( for 1000M port, the self-loop header are made from eight cores of the 8-core
cables, then the packets forwarded by the port will be received by itself.). The external loop test can
locate the hardware failures on the port.
internal: Performs internal loop test. In the internal loop test, self loop is established in the
switching chip to locate the chip failure which is related to the port.
Note that:
After you use the shutdown command on a port, the port cannot run loopback test.
You cannot use the speed, duplex, mdi and shutdown commands on the ports running loopback
test.
Some ports do not support loopback test, and corresponding prompts will be given when you
perform loopback test on them.

Enabling the System to Test Connected Cable

You can enable the system to test the cable connected to a specific port. The test result will be returned
in five seconds. The system can test these attributes of the cable: Receive and transmit directions (RX
and TX), short circuit/open circuit or not, the length of the faulty cable.
Follow these steps to enable the system to test connected cables:
To do...
Enter system view
Enter Ethernet port view
Enable the system to test
connected cables
Use the command...
system-view
interface interface-type interface-number
loopback { external | internal }
Use the command...
system-view
interface interface-type
interface-number
virtual-cable-test
1-6
Remarks
—
—
Required
Remarks
—
—
Required