Cisco 2960S Rx power high alarm

[vincentyore]

Hi

I am having a problem with connecting my two Cisco switches one is a Cisco 3750X to a Cisco 2960S I have new SFP GLC-LH-SMD conneted to mode conditioning cable. I get the following logged and port goes down after a few minutes.

%SFF8472-5-THRESHOLD_VIOLATION: Gi1/0/26: Rx power high warning; Operating value:  -2.7 dBm, Threshold value:  -3.0 dBm.

show interfaces transceiver

If device is externally calibrated, only calibrated values are printed.

++ : high alarm, +  : high warning, -  : low warning, -- : low alarm.

NA or N/A: not applicable, Tx: transmit, Rx: receive.

mA: milliamperes, dBm: decibels (milliwatts).

                                 Optical   Optical

           Temperature  Voltage  Tx Power  Rx Power

Port       (Celsius)    (Volts)  (dBm)     (dBm)

---------  -----------  -------  --------  --------

Gi1/0/26     25.2       3.31      -5.1     -28.5

[Jeff Van Houten]

What is the distance between the switches?

Sent from Cisco Technical Support iPad App

[vincentyore]

Hi

The distance is approx 350 - 400 Meters

I have changed over to GLC-SX-MMD SFP's with standard Muti Mode patch leads and it is working.

I am still not sure why the other didnt work.

[Ankur Arora]

Vincent,

Provide the following outputs:

sh int gig1/0/26 transceiver detail

sh idprom int gig1/0/26

Show interface gig1/0/26 transceiver threshold violations

Thanks

Ankur

[vincentyore]

I got it working with GLC-SX-MMD SFP's and Multi mode cables. All seems good now the distance is approx 350 - 400 meters still not sure why it did not work. Here is the details of the Multi Mode does this all look ok?

sh interfaces gigabitEthernet 1/0/26 transceiver

ITU Channel not available (Wavelength not available),

Transceiver is internally calibrated.

If device is externally calibrated, only calibrated values are printed.

++ : high alarm, +  : high warning, -  : low warning, -- : low alarm.

NA or N/A: not applicable, Tx: transmit, Rx: receive.

mA: milliamperes, dBm: decibels (milliwatts).

                                 Optical   Optical

           Temperature  Voltage  Tx Power  Rx Power

Port       (Celsius)    (Volts)  (dBm)     (dBm)

---------  -----------  -------  --------  --------

Gi1/0/25     24.9       3.30      -5.6      -7.3

----------------------------------------------------------------------------------------------------------------------------------------------------------

sh int transceiver detail

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)

--------- ------------------  ----------  ---------  ---------  ---------

Gi1/0/26    24.9                90.0        85.0        -5.0      -10.0

                              High Alarm  High Warn  Low Warn   Low Alarm

           Voltage            Threshold   Threshold  Threshold  Threshold

Port       (Volts)            (Volts)     (Volts)    (Volts)    (Volts)

---------  ---------------    ----------  ---------  ---------  ---------

Gi1/0/26   3.31                  3.63        3.47        3.14       2.97

           Optical            High Alarm  High Warn  Low Warn   Low Alarm

           Transmit Power     Threshold   Threshold  Threshold  Threshold

Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)

---------  -----------------  ----------  ---------  ---------  ---------

Gi1/0/26    -5.7                 0.0        -3.0        -9.5      -13.5

           Optical            High Alarm  High Warn  Low Warn   Low Alarm

           Receive Power      Threshold   Threshold  Threshold  Threshold

Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)

-------    -----------------  ----------  ---------  ---------  ---------

Gi1/0/26    -7.3                 3.0         0.0       -17.0      -21.0

[Ankur Arora]

Hi Vincent,

The above logs look absolutely good.

I believe that you were getting the error because of the use of MCP. As the the SFP was sucking in more power than required.

Following are the installation notes for the MCP(Mode Conditioning Patch)

http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/installation/note/OL_19329.html

Following is another doc related to the MCP.

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_bulletin_c25-530836.html

Thanks

Ankur

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[vincentyore]

Hi just to let you know as I like to close out all my questions on forms I had a bad batch of Mode conditioning cables once I replace all working now thanks to all for your help.