H3C Technologies H3C S3100 Series Switches - Manual (Page 132)

Operation Manual – Port Basic Configuration
H3C S3100-52P Ethernet Switch Chapter 1 Port Basic Configuration
1-10
Note:
z external:
Performs external loop test. In the external loop test, self-loop headers
(which are made from four cores of the 8-core cables,then the packets forwarded by
the port will be received by itself.) must be used on the port of the switch. 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.
1.2.10 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.
Table 1-12
Enable the system to test connected cables
Operation 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
1.2.11 Configuring the Interval to Perform Statistical Analysis on Port Traffic
By performing the following configuration, you can set the interval to perform statistical
analysis on the traffic of a port.
When you use the display interface interface-type interface-number command to
display the information of a port, the system performs statistical analysis on the traffic
flow passing through the port during the specified interval and displays the average
rates in the interval. For example, if you set this interval to 100 seconds, the displayed
information is as follows:
Last 100 seconds input: 0 packets/sec 0 bytes/sec
Last 100 seconds output: 0 packets/sec 0 bytes/sec