Warning message about Rx power high on Catalyst 4500E

SATORU SAEGUSA · ‎02-18-2013

Hi,

The following messages are logged in the irregular on Catalyst 4500E Supervisor Engine 7-E.
Are these fiber links required the attenuators?

%SFF8472-5-THRESHOLD_VIOLATION: Te2/6: Rx power high warning; Operating value:   0.5 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te3/6: Rx power high warning; Operating value:   0.9 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te2/6: Rx power high warning; Operating value:   0.6 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te3/6: Rx power high warning; Operating value:   0.9 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te2/6: Rx power high warning; Operating value:   0.6 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te3/6: Rx power high warning; Operating value:   0.9 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te2/6: Rx power high warning; Operating value:   0.6 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te3/6: Rx power high warning; Operating value:   0.8 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te2/6: Rx power high warning; Operating value:   0.5 dBm, Threshold value:   0.4 dBm.
%SFF8472-5-THRESHOLD_VIOLATION: Te3/6: Rx power high warning; Operating value:   0.9 dBm, Threshold value:   0.4 dBm.

Thank you for your cooperation in advance.

-------- Additional Logs Start --------
Cat45E+Sup7E#show interfaces Te2/6 | inc media type
Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
Cat45E+Sup7E#show interfaces Te3/6 | inc media type
Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
Cat45E+Sup7E#show interfaces transceiver module 2
Load for five secs: 5%/1%; one minute: 6%; five minutes: 6%
Time source is NTP, 13:29:28.720 JST Tue Feb 19 2013
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)
--------- ----------- ------- -------- --------
Te2/1        35.6       3.26      -1.6      -0.2
Te2/2        37.0       3.26      -1.7      -0.3
Te2/3        35.1       3.27      -2.6      -2.2
Te2/4        36.7       3.28      -2.5      -2.5
Te2/5        35.6       3.25      -1.3      -0.9
Te2/6        35.0       3.26      -1.7       0.6
Te2/7        36.1       3.28      -2.4      -2.8
Te2/8        35.1       3.28      -2.4      -3.0
Te2/9        33.1       3.23      -2.4      -2.4
Te2/10       32.2       3.32      -2.1      -3.0
Te2/11       35.0       3.25      -2.5      -2.9

Cat45E+Sup7E#show interfaces transceiver module 3
Load for five secs: 6%/2%; one minute: 6%; five minutes: 6%
Time source is NTP, 13:29:44.348 JST Tue Feb 19 2013
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)
--------- ----------- ------- -------- --------
Te3/1        36.2       3.26      -2.1       0.2
Te3/2        35.6       3.26      -1.7      -0.6
Te3/3        36.8       3.26      -2.4      -3.4
Te3/4        36.8       3.28      -2.5      -2.6
Te3/5        35.2       3.26      -1.3       0.0
Te3/6        36.2       3.26      -1.1       0.9
Te3/7        34.2       3.28      -2.4      -2.8
Te3/8        34.0       3.29      -2.0      -3.1
Te3/9        35.4       3.28      -2.5      -2.3
Te3/10       32.5       3.24      -2.4      -4.2
Te3/11       34.2       3.28      -2.4      -3.2

Cat45E+Sup7E#show interfaces transceiver threshold-table
Load for five secs: 7%/3%; one minute: 6%; five minutes: 6%
Time source is NTP, 13:29:52.304 JST Tue Feb 19 2013
              Optical Tx     Optical Rx    Temp     Laser Bias    Voltage
                                                    current
             ------------- ------------- ------   ------------ ---------

10GE LR SFP+
Min1            -12.20        -18.40        -5            N/A          3.00
Min2             -8.20        -14.40        0             N/A          3.10
Max2              0.50          0.50        70            N/A          3.50
Max1              3.50          3.50        75            N/A          3.60

-------- Additional Logs End --------

Tom Randstrom · ‎02-19-2013

The 10GBASE-LX interface shouldn't require an attenuator; as the optical transmit level (max - 0.5dBm) does not exceed the maximum receiver input specification (0.5dBm. It is possible these two SFPs is not tuned correctly.

Your posted output shows the 2/6 to 3/6 links with a higher receive power level than the transmit level (optical amplification - NOT). Can you try swapping out these SFPs and see if the errors continue? Otherwise you can add 5 to 10dB of attenuation to remove the alarm.

LtifiYosri1 · ‎10-21-2014

Hi Tom,

Can you please tell how to change the value of the threshold?

Thanks in Advance.

Marvin Rhoads · ‎10-21-2014

The power thresholds are not configurable as they are hard-coded into the firmware associated with the SFPs.

If you are seeing high power violations you should add inline attenuation.

LtifiYosri1 · ‎10-24-2014

Thank you Marvin

Ashwin Jingade · ‎01-29-2015

Hello Marivin.

I am configured new WS-C4500X-32 switches for distribution layer and server aggreation WS-C3650-48TQ-E with these model.

I am geetting below error message. I read your document but i ham getting here low alaram, i have observed because of this i am loosing connectiy with my neibhor device and ehter channel is flapping.

Kindly help me to fix this....

*Jan 28 23:54:04.417: %SFF8472-5-THRESHOLD_VIOLATION: Te1/29: Rx power low alarm; Operating value: -16.4 dBm, Threshold value: -13.9 dBm.
*Jan 28 23:54:07.317: %SFF8472-5-THRESHOLD_VIOLATION: Te1/31: Rx power low warning; Operating value: -10.5 dBm, Threshold value: -9.9 dBm.
*Jan 28 23:54:07.417: %SFF8472-5-THRESHOLD_VIOLATION: Te1/32: Rx power low warning; Operating value: -11.4 dBm, Threshold value: -9.9 dBm.

Marvin Rhoads · ‎01-29-2015

That is most likely due to:

1. Loose patch cable

2. Dirty connection at patch point

3. Bad or damaged fiber in the path.

After verifying the transmit end power level ("show interface <number> transceiver detail"), reseat and clean each patch cable along the path. Then check the receive end power levels once again. If it's still bad, try moving to a different fiber pair if one is available. If not, then have your cabling vendor measure and correct the optical attenuation by either reterminating or replacing the strands.

Ashwin Jingade · ‎02-11-2015

Hello Marvin

Thanks for guidence.

I found vendor supplied cable was 62.5/125 diametter & its for Single mode. My SFP's are multimode

after replacing the cables from 50/125 diametter it's started to working without any error.

Thanks!

Ashiwn.