Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
27
No. Items to check Cause Action
whether there is a
count for the following
item for the target line:
If there is a count, see
the Cause and Action
columns.
 Link down
Check whether the cables are connected
correctly (for example, check for incomplete
insertion). For cable connections, see the
Hardware Instruction Manual.
Replace with the connection interface
supported by the Switch. For the connection
interfaces supported by the Switch, see the
Hardware Instruction Manual and Configuration
Guides.
2 Use the show
interfaces
operation command to
display the
receive-error statistics,
and check whether
there is a count for the
following items for the
target line: If there is a
count, see the Cause
and Action columns.
 CRC errors
 Symbol errors
Check the cable type. For the cable types, see
the Hardware Instruction Manual.
Check the cable length. For the cable length,
see the Hardware Instruction Manual.
Check whether the cables are connected
correctly (for example, check for incomplete
insertion). For cable connections, see the
Hardware Instruction Manual.
Replace with the connection interface
supported by the Switch. For the connection
interfaces supported by the Switch, see the
Hardware Instruction Manual and Configuration
Guides.
3 Use the show
interfaces
operation command to
check the line type and
line speed on the
target line. If the line
type or speed is
invalid, see the Cause
and Action columns.
The cable is not
compatible.
Check the cable type. For the cable types, see
the Hardware Instruction Manual.
The values specified for
the speed and duplex
configuration commands
are different from those
on the remote device.
For the speed and duplex configuration
commands, specify the same values that are
on the remote device.
4 Use the show
interfaces
operation command to
display the failure
statistics, and check
whether there is a
count for the following
item for the target port:
If there is a count, see
the Cause and Action
columns.
 Long frames
Packets exceeding the
maximum allowed frame
length are received.
Adjust the jumbo frame settings to those on the
remote device.
3.4.4 Actions to be taken for 100BASE-FX [AX1250S]/1000BASE-X problems
If a 100BASE-FX [AX1250S] /1000BASE-X problem occurs, use the procedure below to
isolate the failure.
1. Viewing logged data
For details about the information in the operation log, see the Message Log
Reference.
2. Isolating the cause of the problem according to the failure analysis method