Operation Manual – Port Basic Configuration
H3C S5600 Series Ethernet Switches
Chapter 1 Port Basic Configuration
1-7
Note:
z
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.
z
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.
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.
1.1.8 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...
Use the command...
Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Enable the system to test
connected cables
virtual-cable-test
Required
Note:
z
Optical port (including Combo optical port) does not support VCT
(
virtual-cable-test
) function.
z
Combo electrical port supports VCT function only when it is in UP condition (using
undo shutdown command), normal Ethernet electrical port always supports this
function.
