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Configuring a loopback test
You can examine whether an Ethernet port operates properly by performing the Ethernet port loopback
test, during which the port cannot forward data packets normally.
Ethernet port loopback test can be one of the following types:
• Internal loopback test—Self loop is established in the switching chip to check whether there is a
chip failure related to the functions of the port.
• External loopback test—A loopback plug is used on the port. Packets forwarded by the port will be
received by itself through the loopback plug. The external loopback test can be used to check
whether there is a hardware failure on the port.
To configure a loopback test:
1. Select Device > Loopback from the navigation tree.
The page for configuring the loopback test appears.
Figure 60 Loopback test configuration page
2. Select an External or Internal option for loopback test type.
3. Select an Ethernet interface from the chassis front panel.
4. Click Test.
After the test is complete, the loopback test result is displayed in the Result area.
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