Troubleshooting guide

6. Line Testing
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6.1 Testing a line
In line tests, what loops back test frames varies depending on the test type. The following figure
shows what loops back the test frames for various line test types.
Note that line testing for stack configuration is not supported.
Figure 6-1: What loops back the test frames for various line test types
Table 6-1: Test types and fault locations to be identified
6.1.1 Internal loopback test
The internal loopback test, which loops back frames on the Switch, is executed to check for any
faults. You can execute this test for all line types.
The test procedure is described below.
1. Use the inactivate command to put the port to be tested into an inactive state.
2. Execute the
test interfaces command with the internal parameter specified. Wait about
one minute after the execution of the command.
3. Execute the
no test interfaces command, and then check the displayed results.
4. Use the
activate command to place the port back into an active state.
The following figure shows an example of a test in which the sending interval of test frames is set
to two seconds on port number 1 of NIF number 1.
Figure 6-2: Example of an internal loopback test
> inactivate gigabitethernet 1/1
> test interfaces gigabitethernet 1/1 internal interval 2 pattern 4
> no test interfaces gigabitethernet 1/1
Test type What loops back
frames
Fault location to be identified
Internal
loopback test
Switch • AX6700S, AX6600S, and AX6300S series switches
NIF (except for the RJ45 connector and transceiver)
• AX3800S, AX3600S, and AX2400S series switches
Switch (except for the RJ45 connector and transceiver)
Loop connector
loopback test
Loop connector • AX6700S, AX6600S, and AX6300S series switches
NIF (including the RJ45 connector and transceiver)
• AX3800S, AX3600S, and AX2400S series switches
Switch (including the RJ45 connector and transceiver)