01-25-2014 09:34 AM - edited 03-04-2019 10:10 PM
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
01-25-2014 10:32 PM
What is the distance between the switches?
Sent from Cisco Technical Support iPad App
01-27-2014 08:28 AM
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.
01-26-2014 04:57 AM
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
01-27-2014 08:38 AM
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
01-27-2014 01:14 PM
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)
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
"Please rate the post if found useful"
02-05-2014 07:42 AM
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.
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