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New Member

SFP+ Voltage low warning useless logging?

Hi

4500X switch is continuously logging following errors from one port. SFP in the port is Cisco original SFP+ 10GBase-LR.

Should the SFP be replaced or is there a way to get rid of this useless error cluttering the log?

Thanks

Feb 25 13:26:30.618 eet: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1/15: Voltage low warning; Operating value: 3.09 V, Threshold value: 3.10 V.

switch#sh int Te1/1/15 transceiver detail
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, +  : high warning, -  : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.

                              High Alarm  High Warn  Low Warn   Low Alarm
          Temperature         Threshold   Threshold  Threshold  Threshold
Port       (Celsius)          (Celsius)   (Celsius)  (Celsius)  (Celsius)
--------- ------------------  ----------  ---------  ---------  ---------
Te1/1/15    23.4                75.0        70.0         0.0       -5.0

                              High Alarm  High Warn  Low Warn   Low Alarm
           Voltage            Threshold   Threshold  Threshold  Threshold
Port       (Volts)            (Volts)     (Volts)    (Volts)    (Volts)
---------  ---------------    ----------  ---------  ---------  ---------
Te1/1/15   3.09                  3.60        3.50        3.10       3.00

           Optical            High Alarm  High Warn  Low Warn   Low Alarm
           Transmit Power     Threshold   Threshold  Threshold  Threshold
Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)
---------  -----------------  ----------  ---------  ---------  ---------
Te1/1/15    -3.1                 3.4         0.4        -8.2      -12.2

           Optical            High Alarm  High Warn  Low Warn   Low Alarm
           Receive Power      Threshold   Threshold  Threshold  Threshold
Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)
-------    -----------------  ----------  ---------  ---------  ---------
Te1/1/15    -4.8                 3.4         0.4       -14.4      -18.4

Everyone's tags (2)
4 REPLIES
VIP Super Bronze

SFP+ Voltage low warning useless logging?

Hi,

I already have a TAC case open for the same issue.

I will update you when I get anything from Cisco.

HTH

VIP Super Bronze

SFP+ Voltage low warning useless logging?

Hi,

The answer from TAC:

Explanation:

This is expected behaviour unless these ports are connected and do not have db loss. If we have the SFP inserted in fibre ports and do not have optical fibre connected further we receive threshold violation errors.

Action Plan:

To avoid threshold violation messages on optical ports that are not connected, you should admin shut the port down.

You can also remove the SFP inserted on these ports to stop the error message.

HTH

New Member

SFP+ Voltage low warning useless logging?

THanks for this info. In our case the port is connected.

The voltage is only slightly lower than the threshold (3.09 vs 3.10) and the RX optical level is fine.

I guess I need to investigate further.

New Member

SFP+ Voltage low warning useless logging?

The SFP+ turned out to be faulty and was replaced.

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