Operation Manual – Port Basic Configuration
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1 Port Basic Configuration
1-10
Caution:
z To enable loopback detection on a specific port, you must use the
loopback-detection enable command in both system view and the specific port
view.
z After you use the undo loopback-detection enable command in system view,
loopback detection will be disabled on all ports.
1.2.9 Configuring the Ethernet Port to Run 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.
Table 1-11 Configure the Ethernet port to run loopback test
Operation Command Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the Ethernet
port to run loopback test
loopback { external | internal } Optional
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 100M port, the self-loop headers are
made from four cores of the 8-core cables, 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.
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