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3. Troubleshooting Functional Failures in Operation
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3.4.4 Actions against Troubles on 1000BASE-X
If a trouble occurs on 1000BASE-X, follow the procedure below to isolate the problem.
1. Checking log
For the log, see the manual "Message Log Reference."
2. Isolating the problem according to the failure analysis method
Isolate the problem according to the failure analysis method listed below.
Table 3-10: Failure Analysis Method for Troubles on 1000BASE-X
5 According to the failure
statistical information
displayed by the show
interfaces command,
check to see if the statistical
information below is
counted for the port.
If counted, see "Problem"
and "Action" columns.
• Long frames
Packets with
invalid frame
length are received.
Follow the jumbo frame setting on the remote system.
6 Check to see if statistics in
the following is not counted
by the show qos
queueing command. If it
is counted, see "Problem"
and "Action" columns.
• discard_pkt
Packets are being
discarded.
Review the system maintenance using discard control and shaper.
No. Troubleshooting Steps Problem Action
1 According to the failure
statistical information displayed
by the show interfaces
command, check to see if the
statistical information below is
counted for the port. If counted,
see "Problem" and "Action"
columns.
• Link down
• Signal detect errors
Line quality on
receiving side is
degraded.
Check the type of fiber optics. For the fiber optics type, see "Hardware
Installation Guide."
Check the attenuation value if an optical attenuator is used. For the
optical level, see "Hardware Installation Guide."
Check the cable length. For the cable length, see "Hardware Installation
Guide."
Check to see if the cable is connected correctly. Check to see if end
surfaces of the cable are dirty. If they are dirty, remove the dirt.
Check to see if the transceiver is connected correctly.
Use the same values as the remote system in configuration commands
speed and duplex.
Follow the segment standard on the remote system.
Check to see if the optical level is correct. For the optical level, see
"Hardware Installation Guide."
Perform the line test on this system and confirm that there is no problem
in the receiving function. See the execution results of the no test
interfaces command and follow the indicated actions.
For the test type to be specified, see "6.1 Testing Line."
No. Troubleshooting Steps Problem Action