Operation Manual – Port Correlation Configuration
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 Ethernet Port Configuration
1-4
To do...
Use the command...
Remarks
Enter Ethernet port view
interface interface-type
interface-number
—
Enable flow control
flow-control
Required
Turned off by default
1.1.4 Configuring Loopback Testing on an Ethernet Port
You can enable loopback testing to check whether the Ethernet port functions properly.
Note that no data packets can be forwarded during the testing. Loopback testing falls
into the following two categories:
z
Internal loopback testing, which is performed within switching chips to test the
functions related to the Ethernet ports.
z
External loopback testing, which is used to test the hardware functions of an
Ethernet port. To perform external loopback testing on an Ethernet port, you need
to install a loopback plug on the Ethernet port. In this case, packets sent from the
port are received by the same port.
Follow these steps to enable Ethernet port loopback testing:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Enable loopback testing
loopback
{
external
|
internal
}
Optional
Disabled by default.
Note:
z
As for the internal loopback test and external loopback test, if a port is down, only
the former is available on it; if the port is shut down, both are unavailable.
z
The
speed
,
duplex
,
mdi
, and
shutdown
commands are not applicable during a
loopback testing.
z
With the loopback testing enabled, the Ethernet port operates in the full duplex
mode. With the loopback testing enabled, the original configurations will be
restored.